// This file is generated from a similarly-named Perl script in the BoringSSL // source tree. Do not edit by hand. #include #if !defined(OPENSSL_NO_ASM) && defined(OPENSSL_AARCH64) && defined(__APPLE__) #if __ARM_MAX_ARCH__ >= 8 .arch_extension crypto .arch_extension sha3 .text .globl _aes_gcm_enc_kernel .private_extern _aes_gcm_enc_kernel .align 4 _aes_gcm_enc_kernel: AARCH64_SIGN_LINK_REGISTER stp x29, x30, [sp, #-224]! mov x29, sp ld1 { v0.16b}, [x4] // Load initial counter block stp x19, x20, [sp, #16] mov v1.16b, v0.16b // Initialize ctr1-3 from ctr0 mov v2.16b, v0.16b mov v3.16b, v0.16b mov x16, x4 // Pointer to counter block in memory mov x8, x5 // Pointer to AES key schedule context stp x21, x22, [sp, #32] // [sp, #48] is unused but allocated to align the stack layout with aes_gcm_dec_kernel stp d8, d9, [sp, #64] // Save Neon registers stp d10, d11, [sp, #80] stp d12, d13, [sp, #96] stp d14, d15, [sp, #112] ldr w17, [x8, #240] // Load number of AES rounds add x7, x8, x17, lsl #4 // Calculate pointer to the last round key ldp x13, x14, [x7] // load round N key (for final XOR) ldr q31, [x7, #-16] // load round N-1 key add x4, x0, x1, lsr #3 // Calculate end of input lsr x5, x1, #3 // Total byte length mov x15, x5 ldr w12, [x16, #12] // Load counter's low 32 bits sub x5, x5, #1 // byte_len - 1 ldr q18, [x8, #0] // load rk0 and x5, x5, #0xffffffffffffffc0 // Align main loop end to a multiple of 64 bytes add x5, x5, x0 rev w12, w12 // Reverse for big-endian increment uxtw x10, w12 // Zero extend reversed w12 into x10 for final counter update // Pre-compute this value instead of using two instructions to reconstruct it every iteration mov x21, #0xc200000000000000 // GHASH reduction constant str x21, [sp, #128] // We maintain four copies of ctr values on the stack. Each loop iteration we // store the updated ctr value to the last four bytes (e.g., 160 + 12). // We then load the four values. This avoids a singificant number of // expensive GPR->NEON and NEON->NEON moves. To avoid LDST forwarding we // calculate and store the values one iteration ahead so they have time to // drain before we load them. str q0, [sp, #160] // Store base counter for block 0-3 str q0, [sp, #176] str q0, [sp, #192] str q0, [sp, #208] // Since we need the values right away don't go through the stack this first // time. Manually insert the incremented big-endian counter values. rev w20, w12 mov v0.s[3], w20 // ctr0 + 0 add w20, w12, #1 rev w20, w20 mov v1.s[3], w20 // ctr0 + 1 add w20, w12, #2 rev w20, w20 mov v2.s[3], w20 // ctr0 + 2 add w20, w12, #3 rev w20, w20 mov v3.s[3], w20 // ctr0 + 3 // Calculate the ctr values for the *next* (not current) group of four // blocks. Store the incremented parts to the stack. add w20, w12, #4 rev w20, w20 str w20, [sp, #172] // ctr0 + 4 for next iter add w20, w12, #5 rev w20, w20 str w20, [sp, #188] // ctr0 + 5 for next iter add w20, w12, #6 rev w20, w20 str w20, [sp, #204] // ctr0 + 6 for next iter add w20, w12, #7 rev w20, w20 str w20, [sp, #220] // ctr0 + 7 for next iter add w12, w12, #8 // Advance counter past these two sets // --- Start AES for first 4 blocks --- aese v0.16b, v18.16b aesmc v0.16b, v0.16b // AES block 0 - round 0 ldp q19, q20, [x8, #16] // load rk1, rk2 aese v1.16b, v18.16b aesmc v1.16b, v1.16b // AES block 1 - round 0 ldp q21, q22, [x8, #48] // load rk3, rk4 aese v2.16b, v18.16b aesmc v2.16b, v2.16b // AES block 2 - round 0 ldp q23, q24, [x8, #80] // load rk5, rk6 aese v3.16b, v18.16b aesmc v3.16b, v3.16b // AES block 3 - round 0 ldp q13, q14, [x6, #32] // load H2, H3 (GHASH keys) aese v0.16b, v19.16b aesmc v0.16b, v0.16b // AES block 0 - round 1 ldp q25, q26, [x8, #112] // load rk7, rk8 aese v1.16b, v19.16b aesmc v1.16b, v1.16b // AES block 1 - round 1 aese v2.16b, v19.16b aesmc v2.16b, v2.16b // AES block 2 - round 1 aese v3.16b, v19.16b aesmc v3.16b, v3.16b // AES block 3 - round 1 aese v0.16b, v20.16b aesmc v0.16b, v0.16b // AES block 0 - round 2 ext v14.16b, v14.16b, v14.16b, #8 // Byte swap H3 for GHASH aese v1.16b, v20.16b aesmc v1.16b, v1.16b // AES block 1 - round 2 ext v13.16b, v13.16b, v13.16b, #8 // Byte swap H2 for GHASH aese v2.16b, v20.16b aesmc v2.16b, v2.16b // AES block 2 - round 2 ldr q15, [x6, #80] // load H4 aese v3.16b, v20.16b aesmc v3.16b, v3.16b // AES block 3 - round 2 ext v15.16b, v15.16b, v15.16b, #8 // Byte swap H4 for GHASH aese v0.16b, v21.16b aesmc v0.16b, v0.16b // AES block 0 - round 3 ld1 { v11.16b}, [x3] // Load initial GHASH accumulator (T) aese v1.16b, v21.16b aesmc v1.16b, v1.16b // AES block 1 - round 3 ext v11.16b, v11.16b, v11.16b, #8 // Byte swap T for GHASH aese v2.16b, v21.16b aesmc v2.16b, v2.16b // AES block 2 - round 3 rev64 v11.16b, v11.16b // Correct byte order within 64-bit lanes aese v3.16b, v21.16b aesmc v3.16b, v3.16b // AES block 3 - round 3 trn2 v17.2d, v14.2d, v15.2d // Karatsuba key: H4_low | H3_low aese v0.16b, v22.16b aesmc v0.16b, v0.16b // AES block 0 - round 4 ldr q12, [x6] // load H1 aese v1.16b, v22.16b aesmc v1.16b, v1.16b // AES block 1 - round 4 ext v12.16b, v12.16b, v12.16b, #8 // Byte swap H1 for GHASH aese v2.16b, v22.16b aesmc v2.16b, v2.16b // AES block 2 - round 4 trn1 v9.2d, v14.2d, v15.2d // Karatsuba key: H4_high | H3_high aese v3.16b, v22.16b aesmc v3.16b, v3.16b // AES block 3 - round 4 trn2 v16.2d, v12.2d, v13.2d // Karatsuba key: H2_low | H1_low aese v0.16b, v23.16b aesmc v0.16b, v0.16b // AES block 0 - round 5 ldr q30, [x7] // Preload round N key for final EOR aese v1.16b, v23.16b aesmc v1.16b, v1.16b // AES block 1 - round 5 aese v3.16b, v23.16b aesmc v3.16b, v3.16b // AES block 3 - round 5 aese v2.16b, v23.16b aesmc v2.16b, v2.16b // AES block 2 - round 5 aese v0.16b, v24.16b aesmc v0.16b, v0.16b // AES block 0 - round 6 aese v1.16b, v24.16b aesmc v1.16b, v1.16b // AES block 1 - round 6 aese v2.16b, v24.16b aesmc v2.16b, v2.16b // AES block 2 - round 6 aese v3.16b, v24.16b aesmc v3.16b, v3.16b // AES block 3 - round 6 aese v0.16b, v25.16b aesmc v0.16b, v0.16b // AES block 0 - round 7 aese v1.16b, v25.16b aesmc v1.16b, v1.16b // AES block 1 - round 7 aese v2.16b, v25.16b aesmc v2.16b, v2.16b // AES block 2 - round 7 aese v3.16b, v25.16b aesmc v3.16b, v3.16b // AES block 3 - round 7 aese v0.16b, v26.16b aesmc v0.16b, v0.16b // AES block 0 - round 8 aese v1.16b, v26.16b aesmc v1.16b, v1.16b // AES block 1 - round 8 aese v2.16b, v26.16b aesmc v2.16b, v2.16b // AES block 2 - round 8 aese v3.16b, v26.16b aesmc v3.16b, v3.16b // AES block 3 - round 8 cmp x17, #12 // setup flags for AES-128/192/256 check b.lt Lenc_finish_first_blocks // branch if AES-128 ldp q27, q28, [x8, #144] // load rk9, rk10 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 9 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 9 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 9 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 9 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 10 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 10 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 10 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 10 b.eq Lenc_finish_first_blocks // branch if AES-192 ldp q27, q28, [x8, #176] // load rk11, rk12 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 11 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 11 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 11 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 11 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 12 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 12 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 12 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 12 Lenc_finish_first_blocks: cmp x0, x5 // check if we have <= 4 blocks to process in the tail eor v17.16b, v17.16b, v9.16b // Karatsuba key: H3^H4 aese v0.16b, v31.16b // AES block 0 - round N-1 aese v1.16b, v31.16b // AES block 1 - round N-1 aese v2.16b, v31.16b // AES block 2 - round N-1 aese v3.16b, v31.16b // AES block 3 - round N-1 trn1 v8.2d, v12.2d, v13.2d // Karatsuba key: H2_high | H1_high eor v16.16b, v16.16b, v8.16b // Karatsuba key: H1^H2 b.ge Lenc_tail // handle tail if no more full 4-block sets ldp q6, q7, [x0, #32] // AES blocks 2,3 load plaintext ldp q4, q5, [x0], #64 // AES blocks 0,1 load plaintext // Compute and store first 4 ciphertext blocks eor v4.16b, v4.16b, v30.16b eor v4.16b, v4.16b, v0.16b // AES block 0 - result = PT ^ AES(ctr0) eor v5.16b, v5.16b, v30.16b eor v5.16b, v5.16b, v1.16b // AES block 1 - result = PT ^ AES(ctr1) eor v6.16b, v6.16b, v30.16b eor v6.16b, v6.16b, v2.16b // AES block 2 - result = PT ^ AES(ctr2) eor v7.16b, v7.16b, v30.16b eor v7.16b, v7.16b, v3.16b // AES block 3 - result = PT ^ AES(ctr3) st1 { v4.16b, v5.16b, v6.16b, v7.16b}, [x2], #64 // AES blocks 0-3 - store result // Load counter values for the second iteration from the stack ldp q0, q1, [sp, #160] ldp q2, q3, [sp, #192] // Prepare and store counter values for the third iteration rev w20, w12 str w20, [sp, #172] // ctr + 8 add w20, w12, #1 rev w20, w20 str w20, [sp, #188] // ctr + 9 add w20, w12, #2 rev w20, w20 str w20, [sp, #204] // ctr + 10 add w20, w12, #3 rev w20, w20 str w20, [sp, #220] // ctr + 11 add w12, w12, #4 // Advance counter base cmp x0, x5 // check if we have <= 4 blocks remaining b.ge Lenc_prepretail // go to prepretail if < 2 full loops left Lenc_main_loop: // main loop start (processes 4 blocks per iteration) // --- AES Pipeline for blocks 4k+4 to 4k+7 --- aese v0.16b, v18.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 0 aese v1.16b, v18.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 0 aese v2.16b, v18.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 0 aese v3.16b, v18.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 0 ldr d8, [sp, #128] // Load GHASH reduction constant aese v0.16b, v19.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 1 aese v1.16b, v19.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 1 aese v2.16b, v19.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 1 aese v3.16b, v19.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 1 // --- GHASH Pipeline (interleaved with AES) for blocks 4k to 4k+3 --- rev64 v4.16b, v4.16b // GHASH block 4k - Byte swap CT rev64 v5.16b, v5.16b // GHASH block 4k+1 - Byte swap CT rev64 v6.16b, v6.16b // GHASH block 4k+2 - Byte swap CT rev64 v7.16b, v7.16b // GHASH block 4k+3 - Byte swap CT aese v0.16b, v20.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 2 ext v11.16b, v11.16b, v11.16b, #8 // GHASH - prepare acc for XOR aese v1.16b, v20.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 2 eor v4.16b, v4.16b, v11.16b // GHASH block 4k - Y_i = CT_i ^ Y_{i-1} aese v2.16b, v20.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 2 pmull v11.1q, v4.1d, v15.1d // GHASH block 4k - low aese v3.16b, v20.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 2 pmull2 v9.1q, v6.2d, v13.2d // GHASH block 4k+2 - high aese v0.16b, v21.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 3 mov d10, v17.d[1] // GHASH block 4k - mid Karatsuba key aese v1.16b, v21.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 3 mov d20, v4.d[1] // GHASH block 4k - mid aese v2.16b, v21.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 3 eor v20.8b, v20.8b, v4.8b // GHASH block 4k - mid aese v3.16b, v21.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 3 mov d21, v5.d[1] // GHASH block 4k+1 - mid aese v0.16b, v22.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 4 eor v21.8b, v21.8b, v5.8b // GHASH block 4k+1 - mid aese v1.16b, v22.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 4 pmull v10.1q, v20.1d, v10.1d // GHASH block 4k - mid aese v2.16b, v22.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 4 pmull v21.1q, v21.1d, v17.1d // GHASH block 4k+1 - mid aese v3.16b, v22.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 4 eor v10.16b, v10.16b, v21.16b // GHASH block 4k+1 - mid aese v0.16b, v23.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 5 ext v22.16b, v22.16b, v6.16b, #8 // GHASH block 4k+2 - mid aese v1.16b, v23.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 5 eor v22.16b, v22.16b, v6.16b // GHASH block 4k+2 - mid aese v2.16b, v23.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 5 pmull2 v22.1q, v22.2d, v16.2d // GHASH block 4k+2 - mid aese v3.16b, v23.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 5 mov d23, v7.d[1] // GHASH block 4k+3 - mid aese v0.16b, v24.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 6 eor v23.8b, v23.8b, v7.8b // GHASH block 4k+3 - mid aese v1.16b, v24.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 6 pmull v23.1q, v23.1d, v16.1d // GHASH block 4k+3 - mid aese v2.16b, v24.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 6 eor v10.16b, v10.16b, v22.16b eor v10.16b, v10.16b, v23.16b // GHASH block 4k+2/3 - mid aese v3.16b, v24.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 6 pmull2 v22.1q, v4.2d, v15.2d // GHASH block 4k - high aese v0.16b, v25.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 7 pmull2 v21.1q, v7.2d, v12.2d // GHASH block 4k+3 - high eor v22.16b, v22.16b, v21.16b // GHASH block 4k+3 - high aese v1.16b, v25.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 7 pmull2 v23.1q, v5.2d, v14.2d // GHASH block 4k+1 - high aese v2.16b, v25.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 7 pmull v21.1q, v6.1d, v13.1d // GHASH block 4k+2 - low aese v3.16b, v25.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 7 pmull v20.1q, v5.1d, v14.1d // GHASH block 4k+1 - low eor v9.16b, v9.16b, v22.16b eor v9.16b, v9.16b, v23.16b // GHASH block 4k/1/2/3 - high pmull v22.1q, v7.1d, v12.1d // GHASH block 4k+3 - low ldp q6, q7, [x0, #32] ldp q4, q5, [x0], #64 eor v20.16b, v20.16b, v21.16b // GHASH block 4k+1 - low aese v0.16b, v26.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 8 eor v11.16b, v11.16b, v22.16b eor v11.16b, v11.16b, v20.16b // GHASH block 4k/1/2/3 - low aese v1.16b, v26.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 8 eor v10.16b, v10.16b, v9.16b eor v10.16b, v10.16b, v11.16b // MODULO - karatsuba tidy up aese v2.16b, v26.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 8 pmull v20.1q, v9.1d, v8.1d // MODULO - top 64b align with mid aese v3.16b, v26.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 8 cmp x17, #12 // setup flags for AES-128/192/256 check b.lt Lenc_main_loop_continue // branch if AES-128 ldp q27, q28, [x8, #144] // load rk9, rk10 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 9 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 9 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 9 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 9 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 10 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 10 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 10 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 10 b.eq Lenc_main_loop_continue // branch if AES-192 ldp q27, q28, [x8, #176] // load rk11, rk12 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 11 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 11 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 11 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 11 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 12 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 12 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 12 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 12 Lenc_main_loop_continue: ext v9.16b, v9.16b, v9.16b, #8 // MODULO - other top alignment eor v10.16b, v10.16b, v20.16b eor v10.16b, v10.16b, v9.16b // MODULO - fold into mid pmull v9.1q, v10.1d, v8.1d // MODULO - mid 64b align with low ext v20.16b, v10.16b, v10.16b, #8 // MODULO - other mid alignment eor v11.16b, v9.16b, v11.16b eor v11.16b, v11.16b, v20.16b // MODULO - fold into low aese v0.16b, v31.16b // AES block 4k+4 - round N-1 eor v4.16b, v4.16b, v30.16b eor v4.16b, v4.16b, v0.16b // AES block 4k+4 - result aese v1.16b, v31.16b // AES block 4k+5 - round N-1 eor v5.16b, v5.16b, v30.16b eor v5.16b, v5.16b, v1.16b // AES block 4k+5 - result aese v2.16b, v31.16b // AES block 4k+6 - round N-1 eor v6.16b, v6.16b, v30.16b eor v6.16b, v6.16b, v2.16b // AES block 4k+6 - result aese v3.16b, v31.16b // AES block 4k+7 - round N-1 eor v7.16b, v7.16b, v30.16b eor v7.16b, v7.16b, v3.16b // AES block 4k+7 - result ldp q0, q1, [sp, #160] ldp q2, q3, [sp, #192] // We used these registers as temporaries above so reload the RKs. ldp q20, q21, [x8, #32] // load rk2, rk3 ldp q22, q23, [x8, #64] // load rk4, rk5 st1 { v4.16b, v5.16b, v6.16b, v7.16b}, [x2], #64 // AES blocks 4k+4-7 - store result rev w20, w12 str w20, [sp, #172] add w20, w12, #1 rev w20, w20 str w20, [sp, #188] add w20, w12, #2 rev w20, w20 str w20, [sp, #204] add w20, w12, #3 rev w20, w20 str w20, [sp, #220] add w12, w12, #4 cmp x0, x5 // LOOP CONTROL b.lt Lenc_main_loop Lenc_prepretail: // PREPRETAIL aese v1.16b, v18.16b aesmc v1.16b, v1.16b // AES block 1 - round 0 rev64 v6.16b, v6.16b // GHASH block 2 aese v2.16b, v18.16b aesmc v2.16b, v2.16b // AES block 2 - round 0 aese v0.16b, v18.16b aesmc v0.16b, v0.16b // AES block 0 - round 0 rev64 v4.16b, v4.16b // GHASH block 0 ext v11.16b, v11.16b, v11.16b, #8 // PRE 0 aese v2.16b, v19.16b aesmc v2.16b, v2.16b // AES block 2 - round 1 aese v0.16b, v19.16b aesmc v0.16b, v0.16b // AES block 0 - round 1 eor v4.16b, v4.16b, v11.16b // PRE 1 rev64 v5.16b, v5.16b // GHASH block 1 aese v2.16b, v20.16b aesmc v2.16b, v2.16b // AES block 2 - round 2 aese v3.16b, v18.16b aesmc v3.16b, v3.16b // AES block 3 - round 0 mov d10, v17.d[1] // GHASH block 0 - mid Karatsuba key aese v1.16b, v19.16b aesmc v1.16b, v1.16b // AES block 1 - round 1 pmull v11.1q, v4.1d, v15.1d // GHASH block 0 - low mov d8, v4.d[1] // GHASH block 0 - mid pmull2 v9.1q, v4.2d, v15.2d // GHASH block 0 - high aese v2.16b, v21.16b aesmc v2.16b, v2.16b // AES block 2 - round 3 aese v1.16b, v20.16b aesmc v1.16b, v1.16b // AES block 1 - round 2 eor v8.8b, v8.8b, v4.8b // GHASH block 0 - mid aese v0.16b, v20.16b aesmc v0.16b, v0.16b // AES block 0 - round 2 aese v3.16b, v19.16b aesmc v3.16b, v3.16b // AES block 3 - round 1 aese v1.16b, v21.16b aesmc v1.16b, v1.16b // AES block 1 - round 3 pmull v10.1q, v8.1d, v10.1d // GHASH block 0 - mid pmull2 v4.1q, v5.2d, v14.2d // GHASH block 1 - high pmull v8.1q, v5.1d, v14.1d // GHASH block 1 - low aese v3.16b, v20.16b aesmc v3.16b, v3.16b // AES block 3 - round 2 eor v9.16b, v9.16b, v4.16b // GHASH block 1 - high mov d4, v5.d[1] // GHASH block 1 - mid aese v0.16b, v21.16b aesmc v0.16b, v0.16b // AES block 0 - round 3 eor v11.16b, v11.16b, v8.16b // GHASH block 1 - low aese v3.16b, v21.16b aesmc v3.16b, v3.16b // AES block 3 - round 3 eor v4.8b, v4.8b, v5.8b // GHASH block 1 - mid mov d8, v6.d[1] // GHASH block 2 - mid aese v0.16b, v22.16b aesmc v0.16b, v0.16b // AES block 0 - round 4 rev64 v7.16b, v7.16b // GHASH block 3 aese v3.16b, v22.16b aesmc v3.16b, v3.16b // AES block 3 - round 4 pmull v4.1q, v4.1d, v17.1d // GHASH block 1 - mid eor v8.8b, v8.8b, v6.8b // GHASH block 2 - mid pmull v5.1q, v6.1d, v13.1d // GHASH block 2 - low aese v3.16b, v23.16b aesmc v3.16b, v3.16b // AES block 3 - round 5 aese v2.16b, v22.16b aesmc v2.16b, v2.16b // AES block 2 - round 4 eor v10.16b, v10.16b, v4.16b // GHASH block 1 - mid pmull2 v4.1q, v6.2d, v13.2d // GHASH block 2 - high eor v11.16b, v11.16b, v5.16b // GHASH block 2 - low ins v8.d[1], v8.d[0] // GHASH block 2 - mid aese v2.16b, v23.16b aesmc v2.16b, v2.16b // AES block 2 - round 5 eor v9.16b, v9.16b, v4.16b // GHASH block 2 - high mov d4, v7.d[1] // GHASH block 3 - mid aese v1.16b, v22.16b aesmc v1.16b, v1.16b // AES block 1 - round 4 pmull2 v8.1q, v8.2d, v16.2d // GHASH block 2 - mid eor v4.8b, v4.8b, v7.8b // GHASH block 3 - mid pmull2 v5.1q, v7.2d, v12.2d // GHASH block 3 - high aese v1.16b, v23.16b aesmc v1.16b, v1.16b // AES block 1 - round 5 pmull v4.1q, v4.1d, v16.1d // GHASH block 3 - mid eor v10.16b, v10.16b, v8.16b // GHASH block 2 - mid aese v0.16b, v23.16b aesmc v0.16b, v0.16b // AES block 0 - round 5 aese v1.16b, v24.16b aesmc v1.16b, v1.16b // AES block 1 - round 6 aese v2.16b, v24.16b aesmc v2.16b, v2.16b // AES block 2 - round 6 aese v0.16b, v24.16b aesmc v0.16b, v0.16b // AES block 0 - round 6 aese v3.16b, v24.16b aesmc v3.16b, v3.16b // AES block 3 - round 6 aese v1.16b, v25.16b aesmc v1.16b, v1.16b // AES block 1 - round 7 eor v9.16b, v9.16b, v5.16b // GHASH block 3 - high aese v0.16b, v25.16b aesmc v0.16b, v0.16b // AES block 0 - round 7 aese v3.16b, v25.16b aesmc v3.16b, v3.16b // AES block 3 - round 7 ldr d8, [sp, #128] aese v1.16b, v26.16b aesmc v1.16b, v1.16b // AES block 1 - round 8 eor v10.16b, v10.16b, v4.16b // GHASH block 3 - mid pmull v6.1q, v7.1d, v12.1d // GHASH block 3 - low aese v3.16b, v26.16b aesmc v3.16b, v3.16b // AES block 3 - round 8 cmp x17, #12 // setup flags for AES-128/192/256 check aese v0.16b, v26.16b aesmc v0.16b, v0.16b // AES block 0 - round 8 eor v11.16b, v11.16b, v6.16b // GHASH block 3 - low aese v2.16b, v25.16b aesmc v2.16b, v2.16b // AES block 2 - round 7 eor v10.16b, v10.16b, v9.16b // karatsuba tidy up aese v2.16b, v26.16b aesmc v2.16b, v2.16b // AES block 2 - round 8 pmull v4.1q, v9.1d, v8.1d ext v9.16b, v9.16b, v9.16b, #8 eor v10.16b, v10.16b, v11.16b b.lt Lenc_finish_prepretail // branch if AES-128 ldp q27, q28, [x8, #144] // load rk9, rk10 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 9 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 9 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 9 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 9 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 10 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 10 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 10 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 10 b.eq Lenc_finish_prepretail // branch if AES-192 ldp q27, q28, [x8, #176] // load rk11, rk12 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 11 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 11 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 11 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 11 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 12 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 12 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 12 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 12 Lenc_finish_prepretail: aese v0.16b, v31.16b // AES block 0 - round N-1 aese v1.16b, v31.16b // AES block 1 - round N-1 aese v2.16b, v31.16b // AES block 2 - round N-1 aese v3.16b, v31.16b // AES block 3 - round N-1 eor v10.16b, v10.16b, v4.16b eor v10.16b, v10.16b, v9.16b pmull v4.1q, v10.1d, v8.1d ext v10.16b, v10.16b, v10.16b, #8 eor v11.16b, v11.16b, v4.16b eor v11.16b, v11.16b, v10.16b Lenc_tail: // TAIL: Process remaining 0 to 3 blocks ext v8.16b, v11.16b, v11.16b, #8 // Save current GHASH state for partial tag feed-in sub x5, x4, x0 // main_end_input_ptr is number of bytes left to process ldp x6, x7, [x0], #16 // AES block 0 - load plaintext eor x6, x6, x13 // AES block 0 - round N low eor x7, x7, x14 // AES block 0 - round N high cmp x5, #48 fmov d4, x6 // AES block 0 - mov low fmov v4.d[1], x7 // AES block 0 - mov high eor v5.16b, v4.16b, v0.16b // AES block 0 - result b.gt Lenc_blocks_more_than_3 cmp x5, #32 mov v3.16b, v2.16b movi v11.8b, #0 movi v9.8b, #0 mov v2.16b, v1.16b movi v10.8b, #0 b.gt Lenc_blocks_more_than_2 mov v3.16b, v1.16b cmp x5, #16 b.gt Lenc_blocks_more_than_1 b Lenc_blocks_less_than_1 Lenc_blocks_more_than_3: // blocks left > 3 st1 { v5.16b}, [x2], #16 // AES final-2 block - store result ldp x6, x7, [x0], #16 // AES final-2 block - load input low & high rev64 v4.16b, v5.16b // GHASH final-3 block eor x6, x6, x13 // AES final-2 block - round N low eor v4.16b, v4.16b, v8.16b // feed in partial tag eor x7, x7, x14 // AES final-2 block - round N high mov d22, v4.d[1] // GHASH final-3 block - mid fmov d5, x6 // AES final-2 block - mov low fmov v5.d[1], x7 // AES final-2 block - mov high eor v22.8b, v22.8b, v4.8b // GHASH final-3 block - mid movi v8.8b, #0 // suppress further partial tag feed in mov d10, v17.d[1] // GHASH final-3 block - mid pmull v11.1q, v4.1d, v15.1d // GHASH final-3 block - low pmull2 v9.1q, v4.2d, v15.2d // GHASH final-3 block - high pmull v10.1q, v22.1d, v10.1d // GHASH final-3 block - mid eor v5.16b, v5.16b, v1.16b // AES final-2 block - result Lenc_blocks_more_than_2: // blocks left > 2 st1 { v5.16b}, [x2], #16 // AES final-2 block - store result ldp x6, x7, [x0], #16 // AES final-1 block - load input low & high rev64 v4.16b, v5.16b // GHASH final-2 block eor x6, x6, x13 // AES final-1 block - round N low eor v4.16b, v4.16b, v8.16b // feed in partial tag fmov d5, x6 // AES final-1 block - mov low eor x7, x7, x14 // AES final-1 block - round N high fmov v5.d[1], x7 // AES final-1 block - mov high movi v8.8b, #0 // suppress further partial tag feed in pmull2 v20.1q, v4.2d, v14.2d // GHASH final-2 block - high mov d22, v4.d[1] // GHASH final-2 block - mid pmull v21.1q, v4.1d, v14.1d // GHASH final-2 block - low eor v22.8b, v22.8b, v4.8b // GHASH final-2 block - mid eor v5.16b, v5.16b, v2.16b // AES final-1 block - result eor v9.16b, v9.16b, v20.16b // GHASH final-2 block - high pmull v22.1q, v22.1d, v17.1d // GHASH final-2 block - mid eor v11.16b, v11.16b, v21.16b // GHASH final-2 block - low eor v10.16b, v10.16b, v22.16b // GHASH final-2 block - mid Lenc_blocks_more_than_1: // blocks left > 1 st1 { v5.16b}, [x2], #16 // AES final-1 block - store result rev64 v4.16b, v5.16b // GHASH final-1 block: Byte Swap CT ldp x6, x7, [x0], #16 // AES final block - load plaintext eor v4.16b, v4.16b, v8.16b // Feed in partial tag movi v8.8b, #0 // Clear for next block eor x6, x6, x13 // AES final block - round N low mov d22, v4.d[1] // GHASH final-1 block - mid pmull2 v20.1q, v4.2d, v13.2d // GHASH final-1 block - high eor x7, x7, x14 // AES final block - round N high eor v22.8b, v22.8b, v4.8b // GHASH final-1 block - mid eor v9.16b, v9.16b, v20.16b // GHASH final-1 block - high ins v22.d[1], v22.d[0] // GHASH final-1 block - mid fmov d5, x6 // AES final block - mov low fmov v5.d[1], x7 // AES final block - mov high pmull2 v22.1q, v22.2d, v16.2d // GHASH final-1 block - mid pmull v21.1q, v4.1d, v13.1d // GHASH final-1 block - low eor v5.16b, v5.16b, v3.16b // AES final block - result eor v10.16b, v10.16b, v22.16b // GHASH final-1 block - mid eor v11.16b, v11.16b, v21.16b // GHASH final-1 block - low Lenc_blocks_less_than_1: // Last partial block handling add x10, x10, x1, lsr #7 // Calculate the updated counter based on the number of 16B chunks we processed rev w10, w10 str w10, [x16, #12] // store the updated counter and x1, x1, #127 // bit_length %= 128 mvn x13, xzr // Mask for low 64 bits sub x1, x1, #128 // neg x1, x1 // Valid bits in the last block (1-128) ldr q18, [x2] // Load destination for merging mvn x14, xzr // Mask for high 64 bits and x1, x1, #127 // bit_length %= 128 lsr x14, x14, x1 // rkN_h is mask for top 64b of last block cmp x1, #64 csel x6, x13, x14, lt csel x7, x14, xzr, lt fmov d0, x6 // ctr0d is mask for last block fmov v0.d[1], x7 and v5.16b, v5.16b, v0.16b // Mask out unused bits of the last CT block rev64 v4.16b, v5.16b // GHASH final block - byte swap eor v4.16b, v4.16b, v8.16b // Feed in partial tag bif v5.16b, v18.16b, v0.16b // Bitwise Insert: merge with existing data at output_ptr pmull2 v20.1q, v4.2d, v12.2d // GHASH final block - high mov d8, v4.d[1] // GHASH final block - mid pmull v21.1q, v4.1d, v12.1d // GHASH final block - low eor v9.16b, v9.16b, v20.16b // GHASH final block - high eor v8.8b, v8.8b, v4.8b // GHASH final block - mid pmull v8.1q, v8.1d, v16.1d // GHASH final block - mid eor v11.16b, v11.16b, v21.16b // GHASH final block - low eor v10.16b, v10.16b, v8.16b // GHASH final block - mid eor v4.16b, v11.16b, v9.16b // MODULO - karatsuba tidy up fmov d8, x21 eor v10.16b, v10.16b, v4.16b // MODULO - karatsuba tidy up pmull v7.1q, v9.1d, v8.1d // MODULO - top 64b align with mid ext v9.16b, v9.16b, v9.16b, #8 // MODULO - other top alignment eor v10.16b, v10.16b, v7.16b eor v10.16b, v10.16b, v9.16b // MODULO - fold into mid pmull v9.1q, v10.1d, v8.1d // MODULO - mid 64b align with low ext v10.16b, v10.16b, v10.16b, #8 // MODULO - other mid alignment st1 { v5.16b}, [x2] // store all 16B eor v11.16b, v11.16b, v9.16b eor v11.16b, v11.16b, v10.16b // MODULO - fold into low ext v11.16b, v11.16b, v11.16b, #8 // Byte swap GHASH result rev64 v11.16b, v11.16b // Final Tag mov x0, x15 st1 { v11.16b }, [x3] // Store final tag ldp x19, x20, [sp, #16] ldp x21, x22, [sp, #32] ldp d8, d9, [sp, #64] ldp d10, d11, [sp, #80] ldp d12, d13, [sp, #96] ldp d14, d15, [sp, #112] ldp x29, x30, [sp], #224 AARCH64_VALIDATE_LINK_REGISTER ret .globl _aes_gcm_dec_kernel .private_extern _aes_gcm_dec_kernel .align 4 _aes_gcm_dec_kernel: AARCH64_SIGN_LINK_REGISTER stp x29, x30, [sp, #-224]! mov x29, sp stp x19, x20, [sp, #16] ld1 { v0.16b}, [x4] mov v1.16b, v0.16b mov v2.16b, v0.16b mov v3.16b, v0.16b mov x16, x4 mov x8, x5 stp x21, x22, [sp, #32] stp x23, x24, [sp, #48] stp d8, d9, [sp, #64] stp d10, d11, [sp, #80] stp d12, d13, [sp, #96] stp d14, d15, [sp, #112] ldr w17, [x8, #240] // Load number of AES rounds add x19, x8, x17, lsl #4 // borrow input_l1 for last key ldp x13, x14, [x19] // load round N keys ldr q31, [x19, #-16] // load round N-1 keys add x4, x0, x1, lsr #3 // end_input_ptr lsr x5, x1, #3 // byte_len mov x15, x5 ldr w9, [x16, #12] // Load scalar 32-bit counter (CTR) sub x5, x5, #1 // byte_len - 1 ldr q18, [x8, #0] // load rk0 and x5, x5, #0xffffffffffffffc0 // number of bytes to be processed in main loop (at least 1 byte must be handled by tail) add x5, x5, x0 rev w9, w9 // Reverse it once for big-endian incrementing uxtw x10, w9 // Zero extend reversed w9 into x10 str q0, [sp, #160] str q0, [sp, #176] str q0, [sp, #192] str q0, [sp, #208] rev w20, w9 mov v0.s[3], w20 add w20, w9, #1 rev w20, w20 mov v1.s[3], w20 add w20, w9, #2 rev w20, w20 mov v2.s[3], w20 add w20, w9, #3 rev w20, w20 mov v3.s[3], w20 add w20, w9, #4 rev w20, w20 str w20, [sp, #172] add w20, w9, #5 rev w20, w20 str w20, [sp, #188] add w20, w9, #6 rev w20, w20 str w20, [sp, #204] add w20, w9, #7 rev w20, w20 str w20, [sp, #220] add w9, w9, #8 // Pre-compute this value instead of using two instructions for moving and then shifting in the main loop mov x21, #0xc200000000000000 str x21, [sp, #128] aese v0.16b, v18.16b aesmc v0.16b, v0.16b // AES block 0 - round 0 ldp q19, q20, [x8, #16] // load rk1, rk2 aese v1.16b, v18.16b aesmc v1.16b, v1.16b // AES block 1 - round 0 ldp q21, q22, [x8, #48] // load rk3, rk4 aese v2.16b, v18.16b aesmc v2.16b, v2.16b // AES block 2 - round 0 ldp q23, q24, [x8, #80] // load rk5, rk6 aese v3.16b, v18.16b aesmc v3.16b, v3.16b // AES block 3 - round 0 ldp q13, q14, [x6, #32] // load h2, h3 aese v0.16b, v19.16b aesmc v0.16b, v0.16b // AES block 0 - round 1 ldp q25, q26, [x8, #112] // load rk7, rk8 aese v1.16b, v19.16b aesmc v1.16b, v1.16b // AES block 1 - round 1 aese v2.16b, v19.16b aesmc v2.16b, v2.16b // AES block 2 - round 1 aese v3.16b, v19.16b aesmc v3.16b, v3.16b // AES block 3 - round 1 aese v0.16b, v20.16b aesmc v0.16b, v0.16b // AES block 0 - round 2 ext v14.16b, v14.16b, v14.16b, #8 aese v1.16b, v20.16b aesmc v1.16b, v1.16b // AES block 1 - round 2 ext v13.16b, v13.16b, v13.16b, #8 ldr q15, [x6, #80] // load h4 aese v2.16b, v20.16b aesmc v2.16b, v2.16b // AES block 2 - round 2 aese v3.16b, v20.16b aesmc v3.16b, v3.16b // AES block 3 - round 2 ext v15.16b, v15.16b, v15.16b, #8 aese v0.16b, v21.16b aesmc v0.16b, v0.16b // AES block 0 - round 3 ld1 { v11.16b}, [x3] aese v1.16b, v21.16b aesmc v1.16b, v1.16b // AES block 1 - round 3 ext v11.16b, v11.16b, v11.16b, #8 aese v2.16b, v21.16b aesmc v2.16b, v2.16b // AES block 2 - round 3 rev64 v11.16b, v11.16b aese v3.16b, v21.16b aesmc v3.16b, v3.16b // AES block 3 - round 3 trn2 v17.2d, v14.2d, v15.2d // h4l | h3l aese v0.16b, v22.16b aesmc v0.16b, v0.16b // AES block 0 - round 4 ldr q12, [x6] // load h1 aese v1.16b, v22.16b aesmc v1.16b, v1.16b // AES block 1 - round 4 ext v12.16b, v12.16b, v12.16b, #8 aese v2.16b, v22.16b aesmc v2.16b, v2.16b // AES block 2 - round 4 trn1 v9.2d, v14.2d, v15.2d // h4h | h3h aese v3.16b, v22.16b aesmc v3.16b, v3.16b // AES block 3 - round 4 trn2 v16.2d, v12.2d, v13.2d // h2l | h1l aese v0.16b, v23.16b aesmc v0.16b, v0.16b // AES block 0 - round 5 aese v1.16b, v23.16b aesmc v1.16b, v1.16b // AES block 1 - round 5 aese v3.16b, v23.16b aesmc v3.16b, v3.16b // AES block 3 - round 5 aese v2.16b, v23.16b aesmc v2.16b, v2.16b // AES block 2 - round 5 aese v0.16b, v24.16b aesmc v0.16b, v0.16b // AES block 0 - round 6 aese v1.16b, v24.16b aesmc v1.16b, v1.16b // AES block 1 - round 6 aese v2.16b, v24.16b aesmc v2.16b, v2.16b // AES block 2 - round 6 aese v3.16b, v24.16b aesmc v3.16b, v3.16b // AES block 3 - round 6 aese v0.16b, v25.16b aesmc v0.16b, v0.16b // AES block 0 - round 7 aese v1.16b, v25.16b aesmc v1.16b, v1.16b // AES block 1 - round 7 aese v2.16b, v25.16b aesmc v2.16b, v2.16b // AES block 2 - round 7 aese v3.16b, v25.16b aesmc v3.16b, v3.16b // AES block 3 - round 7 aese v0.16b, v26.16b aesmc v0.16b, v0.16b // AES block 0 - round 8 aese v1.16b, v26.16b aesmc v1.16b, v1.16b // AES block 1 - round 8 aese v2.16b, v26.16b aesmc v2.16b, v2.16b // AES block 2 - round 8 aese v3.16b, v26.16b aesmc v3.16b, v3.16b // AES block 3 - round 8 cmp x17, #12 // setup flags for AES-128/192/256 check b.lt Ldec_finish_first_blocks // branch if AES-128 ldp q27, q28, [x8, #144] // load rk9, rk10 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 9 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 9 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 9 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 9 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 10 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 10 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 10 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 10 b.eq Ldec_finish_first_blocks // branch if AES-192 ldp q27, q28, [x8, #176] // load rk11, rk12 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 11 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 11 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 11 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 11 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 12 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 12 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 12 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 12 Ldec_finish_first_blocks: ldr q27, [x19] // load rkN cmp x0, x5 // check if we have <= 4 blocks eor v17.16b, v17.16b, v9.16b // h4k | h3k aese v1.16b, v31.16b // AES block 1 - round N-1 aese v2.16b, v31.16b // AES block 2 - round N-1 aese v3.16b, v31.16b // AES block 3 - round N-1 aese v0.16b, v31.16b // AES block 0 - round N-1 trn1 v8.2d, v12.2d, v13.2d // h2h | h1h eor v16.16b, v16.16b, v8.16b // h2k | h1k b.ge Ldec_tail // handle tail // Setup for AES blocks 0-3 is done purely on NEON side instead of mixing NEON and scalar instructions. // This is because the final result of the AES block needs to be EORd with the final round key // value (v30). This avoids several fmovs. ldp q6, q7, [x0, #32] // AES blocks 2,3 load ciphertext ldp q4, q5, [x0], #64 // AES blocks 0,1 load ciphertext eor v0.16b, v4.16b, v0.16b eor v0.16b, v0.16b, v27.16b // AES block 0 - result eor v1.16b, v5.16b, v1.16b eor v1.16b, v1.16b, v27.16b // AES block 1 - result eor v2.16b, v6.16b, v2.16b eor v2.16b, v2.16b, v27.16b // AES block 2 - result eor v3.16b, v7.16b, v3.16b eor v3.16b, v3.16b, v27.16b // AES block 3 - result st1 { v0.16b, v1.16b, v2.16b, v3.16b}, [x2], #64 // AES blocks 0-3 - store result ldr q0, [sp, #160] ldr q1, [sp, #176] ldr q2, [sp, #192] ldr q3, [sp, #208] rev w20, w9 str w20, [sp, #172] add w20, w9, #1 rev w20, w20 str w20, [sp, #188] add w20, w9, #2 rev w20, w20 str w20, [sp, #204] add w20, w9, #3 rev w20, w20 str w20, [sp, #220] add w9, w9, #4 cmp x0, x5 // check if we have <= 4 blocks b.ge Ldec_prepretail // do prepretail Ldec_main_loop: // main loop start aese v0.16b, v18.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 0 aese v1.16b, v18.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 0 aese v2.16b, v18.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 0 aese v3.16b, v18.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 0 aese v0.16b, v19.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 1 aese v1.16b, v19.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 1 aese v2.16b, v19.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 1 aese v3.16b, v19.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 1 rev64 v4.16b, v4.16b // GHASH block 4k rev64 v5.16b, v5.16b // GHASH block 4k+1 rev64 v6.16b, v6.16b // GHASH block 4k+2 rev64 v7.16b, v7.16b // GHASH block 4k+3 aese v0.16b, v20.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 2 ext v11.16b, v11.16b, v11.16b, #8 // PRE 0 aese v1.16b, v20.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 2 eor v4.16b, v4.16b, v11.16b // PRE 1 aese v2.16b, v20.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 2 pmull v11.1q, v4.1d, v15.1d // GHASH block 4k - low aese v3.16b, v20.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 2 pmull2 v9.1q, v4.2d, v15.2d // GHASH block 4k - high aese v0.16b, v21.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 3 mov d10, v17.d[1] // GHASH block 4k - mid aese v1.16b, v21.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 3 mov d8, v4.d[1] // GHASH block 4k - mid aese v2.16b, v21.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 3 eor v8.8b, v8.8b, v4.8b // GHASH block 4k - mid aese v3.16b, v21.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 3 aese v0.16b, v22.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 4 pmull2 v4.1q, v5.2d, v14.2d // GHASH block 4k+1 - high aese v1.16b, v22.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 4 eor v9.16b, v9.16b, v4.16b // GHASH block 4k+1 - high aese v2.16b, v22.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 4 mov d4, v5.d[1] // GHASH block 4k+1 - mid aese v3.16b, v22.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 4 pmull v10.1q, v8.1d, v10.1d // GHASH block 4k - mid aese v0.16b, v23.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 5 pmull v8.1q, v5.1d, v14.1d // GHASH block 4k+1 - low aese v1.16b, v23.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 5 eor v4.8b, v4.8b, v5.8b // GHASH block 4k+1 - mid aese v3.16b, v23.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 5 aese v2.16b, v23.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 5 pmull v5.1q, v6.1d, v13.1d // GHASH block 4k+2 - low aese v0.16b, v24.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 6 eor v11.16b, v11.16b, v8.16b eor v11.16b, v11.16b, v5.16b // GHASH block 4k+1 - low & GHASH block 4k+2 - low aese v1.16b, v24.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 6 mov d8, v6.d[1] // GHASH block 4k+2 - mid aese v2.16b, v24.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 6 eor v8.8b, v8.8b, v6.8b // GHASH block 4k+2 - mid pmull v4.1q, v4.1d, v17.1d // GHASH block 4k+1 - mid ins v8.d[1], v8.d[0] // GHASH block 4k+2 - mid aese v3.16b, v24.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 6 pmull2 v28.1q, v6.2d, v13.2d // GHASH block 4k+2 - high mov d6, v7.d[1] // GHASH block 4k+3 - mid aese v0.16b, v25.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 7 pmull2 v8.1q, v8.2d, v16.2d // GHASH block 4k+2 - mid aese v1.16b, v25.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 7 pmull v27.1q, v7.1d, v12.1d // GHASH block 4k+3 - low aese v2.16b, v25.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 7 eor v10.16b, v10.16b, v4.16b eor v10.16b, v10.16b, v8.16b // GHASH block 4k+1 - mid & GHASH block 4k+2 - mid aese v3.16b, v25.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 7 pmull2 v5.1q, v7.2d, v12.2d // GHASH block 4k+3 - high eor v6.8b, v6.8b, v7.8b // GHASH block 4k+3 - mid eor v9.16b, v9.16b, v28.16b eor v9.16b, v9.16b, v5.16b // GHASH block 4k+2 - high & GHASH block 4k+3 - high aese v0.16b, v26.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 8 aese v1.16b, v26.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 8 aese v2.16b, v26.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 8 pmull v6.1q, v6.1d, v16.1d // GHASH block 4k+3 - mid ldr d8, [sp, #128] aese v3.16b, v26.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 8 pmull v7.1q, v9.1d, v8.1d // MODULO - top 64b align with mid eor v10.16b, v10.16b, v6.16b eor v10.16b, v10.16b, v7.16b // GHASH block 4k+3 - mid & MODULO - fold into mid eor v11.16b, v11.16b, v27.16b // GHASH block 4k+3 - low eor v6.16b, v11.16b, v9.16b // MODULO - karatsuba tidy up ext v9.16b, v9.16b, v9.16b, #8 // MODULO - other top alignment eor v10.16b, v10.16b, v6.16b eor v10.16b, v10.16b, v9.16b // MODULO - karatsuba tidy up & MODULO - fold into mid pmull v8.1q, v10.1d, v8.1d // MODULO - mid 64b align with low ext v10.16b, v10.16b, v10.16b, #8 // MODULO - other mid alignment eor v11.16b, v11.16b, v8.16b eor v11.16b, v11.16b, v10.16b // MODULO - fold into low cmp w17, #12 // setup flags for AES-128/192/256 check b.lt Ldec_main_loop_continue // branch if AES-128 ldp q27, q28, [x8, #144] // load rk9, rk10 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 9 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 9 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 9 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 9 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 10 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 10 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 10 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 10 b.eq Ldec_main_loop_continue // branch if AES-192 ldp q27, q28, [x8, #176] // load rk11, rk12 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 11 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 11 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 11 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 11 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 12 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 12 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 12 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 12 Ldec_main_loop_continue: ldr q27, [x19] // load rkN ldp q6, q7, [x0, #32] // AES blocks 2,3 load ciphertext ldp q4, q5, [x0], #64 // AES blocks 0,1 load ciphertext aese v0.16b, v31.16b // AES block 4k+4 - round N-1 eor v0.16b, v4.16b, v0.16b eor v0.16b, v0.16b, v27.16b // AES block 4k+4 - result aese v1.16b, v31.16b // AES block 4k+5 - round N-1 eor v1.16b, v5.16b, v1.16b eor v1.16b, v1.16b, v27.16b // AES block 4k+5 - result aese v2.16b, v31.16b // AES block 4k+6 - round N-1 eor v2.16b, v6.16b, v2.16b eor v2.16b, v2.16b, v27.16b // AES block 4k+6 - result aese v3.16b, v31.16b // AES block 4k+7 - round N-1 eor v3.16b, v7.16b, v3.16b eor v3.16b, v3.16b, v27.16b // AES block 4k+7 - result st1 { v0.16b, v1.16b, v2.16b, v3.16b}, [x2], #64 // AES blocks 4k+4-7 - store result ldr q0, [sp, #160] ldr q1, [sp, #176] ldr q2, [sp, #192] ldr q3, [sp, #208] rev w20, w9 str w20, [sp, #172] add w20, w9, #1 rev w20, w20 str w20, [sp, #188] add w20, w9, #2 rev w20, w20 str w20, [sp, #204] add w20, w9, #3 rev w20, w20 str w20, [sp, #220] add w9, w9, #4 cmp x0, x5 b.lt Ldec_main_loop Ldec_prepretail: // PREPRETAIL rev64 v4.16b, v4.16b // GHASH block 0 rev64 v5.16b, v5.16b // GHASH block 1 ext v11.16b, v11.16b, v11.16b, #8 // PRE 0 aese v0.16b, v18.16b aesmc v0.16b, v0.16b // AES block 0 - round 0 aese v1.16b, v18.16b aesmc v1.16b, v1.16b // AES block 1 - round 0 eor v4.16b, v4.16b, v11.16b // PRE 1 rev64 v6.16b, v6.16b // GHASH block 2 aese v1.16b, v19.16b aesmc v1.16b, v1.16b // AES block 1 - round 1 pmull v11.1q, v4.1d, v15.1d // GHASH block 0 - low mov d8, v4.d[1] // GHASH block 0 - mid pmull2 v9.1q, v4.2d, v15.2d // GHASH block 0 - high aese v2.16b, v18.16b aesmc v2.16b, v2.16b // AES block 2 - round 0 mov d10, v17.d[1] // GHASH block 0 - mid aese v0.16b, v19.16b aesmc v0.16b, v0.16b // AES block 0 - round 1 eor v8.8b, v8.8b, v4.8b // GHASH block 0 - mid pmull2 v4.1q, v5.2d, v14.2d // GHASH block 1 - high aese v2.16b, v19.16b aesmc v2.16b, v2.16b // AES block 2 - round 1 rev64 v7.16b, v7.16b // GHASH block 3 aese v3.16b, v18.16b aesmc v3.16b, v3.16b // AES block 3 - round 0 pmull v10.1q, v8.1d, v10.1d // GHASH block 0 - mid eor v9.16b, v9.16b, v4.16b // GHASH block 1 - high pmull v8.1q, v5.1d, v14.1d // GHASH block 1 - low aese v3.16b, v19.16b aesmc v3.16b, v3.16b // AES block 3 - round 1 mov d4, v5.d[1] // GHASH block 1 - mid aese v0.16b, v20.16b aesmc v0.16b, v0.16b // AES block 0 - round 2 aese v1.16b, v20.16b aesmc v1.16b, v1.16b // AES block 1 - round 2 eor v11.16b, v11.16b, v8.16b // GHASH block 1 - low aese v2.16b, v20.16b aesmc v2.16b, v2.16b // AES block 2 - round 2 aese v0.16b, v21.16b aesmc v0.16b, v0.16b // AES block 0 - round 3 mov d8, v6.d[1] // GHASH block 2 - mid aese v3.16b, v20.16b aesmc v3.16b, v3.16b // AES block 3 - round 2 eor v4.8b, v4.8b, v5.8b // GHASH block 1 - mid pmull v5.1q, v6.1d, v13.1d // GHASH block 2 - low aese v0.16b, v22.16b aesmc v0.16b, v0.16b // AES block 0 - round 4 aese v3.16b, v21.16b aesmc v3.16b, v3.16b // AES block 3 - round 3 eor v8.8b, v8.8b, v6.8b // GHASH block 2 - mid pmull v4.1q, v4.1d, v17.1d // GHASH block 1 - mid aese v0.16b, v23.16b aesmc v0.16b, v0.16b // AES block 0 - round 5 eor v11.16b, v11.16b, v5.16b // GHASH block 2 - low aese v3.16b, v22.16b aesmc v3.16b, v3.16b // AES block 3 - round 4 pmull2 v5.1q, v7.2d, v12.2d // GHASH block 3 - high eor v10.16b, v10.16b, v4.16b // GHASH block 1 - mid pmull2 v4.1q, v6.2d, v13.2d // GHASH block 2 - high aese v3.16b, v23.16b aesmc v3.16b, v3.16b // AES block 3 - round 5 ins v8.d[1], v8.d[0] // GHASH block 2 - mid aese v2.16b, v21.16b aesmc v2.16b, v2.16b // AES block 2 - round 3 aese v1.16b, v21.16b aesmc v1.16b, v1.16b // AES block 1 - round 3 eor v9.16b, v9.16b, v4.16b eor v9.16b, v9.16b, v5.16b // GHASH block 2 - high & GHASH block 3 - high pmull v4.1q, v7.1d, v12.1d // GHASH block 3 - low aese v2.16b, v22.16b aesmc v2.16b, v2.16b // AES block 2 - round 4 mov d6, v7.d[1] // GHASH block 3 - mid aese v1.16b, v22.16b aesmc v1.16b, v1.16b // AES block 1 - round 4 pmull2 v8.1q, v8.2d, v16.2d // GHASH block 2 - mid aese v2.16b, v23.16b aesmc v2.16b, v2.16b // AES block 2 - round 5 eor v6.8b, v6.8b, v7.8b // GHASH block 3 - mid aese v1.16b, v23.16b aesmc v1.16b, v1.16b // AES block 1 - round 5 aese v3.16b, v24.16b aesmc v3.16b, v3.16b // AES block 3 - round 6 eor v10.16b, v10.16b, v8.16b // GHASH block 2 - mid aese v2.16b, v24.16b aesmc v2.16b, v2.16b // AES block 2 - round 6 aese v0.16b, v24.16b aesmc v0.16b, v0.16b // AES block 0 - round 6 movi v8.8b, #0xc2 aese v1.16b, v24.16b aesmc v1.16b, v1.16b // AES block 1 - round 6 eor v11.16b, v11.16b, v4.16b // GHASH block 3 - low pmull v6.1q, v6.1d, v16.1d // GHASH block 3 - mid aese v3.16b, v25.16b aesmc v3.16b, v3.16b // AES block 3 - round 7 aese v1.16b, v25.16b aesmc v1.16b, v1.16b // AES block 1 - round 7 aese v0.16b, v25.16b aesmc v0.16b, v0.16b // AES block 0 - round 7 eor v10.16b, v10.16b, v6.16b // GHASH block 3 - mid aese v3.16b, v26.16b aesmc v3.16b, v3.16b // AES block 3 - round 8 aese v2.16b, v25.16b aesmc v2.16b, v2.16b // AES block 2 - round 7 eor v6.16b, v11.16b, v9.16b // MODULO - karatsuba tidy up aese v1.16b, v26.16b aesmc v1.16b, v1.16b // AES block 1 - round 8 aese v0.16b, v26.16b aesmc v0.16b, v0.16b // AES block 0 - round 8 shl d8, d8, #56 // mod_constant aese v2.16b, v26.16b aesmc v2.16b, v2.16b // AES block 2 - round 8 cmp w17, #12 // setup flags for AES-128/192/256 check b.lt Ldec_finish_prepretail // branch if AES-128 ldp q27, q28, [x8, #144] // load rk9, rk10 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 9 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 9 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 9 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 9 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 10 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 10 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 10 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 10 b.eq Ldec_finish_prepretail // branch if AES-192 ldp q27, q28, [x8, #176] // load rk11, rk12 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 11 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 11 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 11 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 11 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 12 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 12 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 12 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 12 Ldec_finish_prepretail: eor v10.16b, v10.16b, v6.16b // MODULO - karatsuba tidy up pmull v7.1q, v9.1d, v8.1d // MODULO - top 64b align with mid ext v9.16b, v9.16b, v9.16b, #8 // MODULO - other top alignment eor v10.16b, v10.16b, v7.16b eor v10.16b, v10.16b, v9.16b // MODULO - fold into mid pmull v8.1q, v10.1d, v8.1d // MODULO - mid 64b align with low ext v10.16b, v10.16b, v10.16b, #8 // MODULO - other mid alignment eor v11.16b, v11.16b, v8.16b eor v11.16b, v11.16b, v10.16b // MODULO - fold into low aese v1.16b, v31.16b // AES block 1 - round N-1 aese v0.16b, v31.16b // AES block 0 - round N-1 aese v3.16b, v31.16b // AES block 3 - round N-1 aese v2.16b, v31.16b // AES block 2 - round N-1 Ldec_tail: // TAIL sub x5, x4, x0 // main_end_input_ptr is number of bytes left to process ld1 { v5.16b}, [x0], #16 // AES block 0 - load ciphertext eor v0.16b, v5.16b, v0.16b // AES block 0 - result mov x6, v0.d[0] // AES block 0 - mov low mov x7, v0.d[1] // AES block 0 - mov high ext v8.16b, v11.16b, v11.16b, #8 // prepare final partial tag eor x6, x6, x13 // AES block 0 - round N low eor x7, x7, x14 // AES block 0 - round N high cmp x5, #48 b.gt Ldec_blocks_more_than_3 mov v3.16b, v2.16b movi v10.8b, #0 movi v11.8b, #0 movi v9.8b, #0 mov v2.16b, v1.16b cmp x5, #32 b.gt Ldec_blocks_more_than_2 mov v3.16b, v1.16b cmp x5, #16 b.gt Ldec_blocks_more_than_1 b Ldec_blocks_less_than_1 Ldec_blocks_more_than_3: // blocks left > 3 rev64 v4.16b, v5.16b // GHASH final-3 block ld1 { v5.16b}, [x0], #16 // AES final-2 block - load ciphertext stp x6, x7, [x2], #16 // AES final-3 block - store result mov d10, v17.d[1] // GHASH final-3 block - mid eor v4.16b, v4.16b, v8.16b // feed in partial tag eor v0.16b, v5.16b, v1.16b // AES final-2 block - result mov d22, v4.d[1] // GHASH final-3 block - mid mov x6, v0.d[0] // AES final-2 block - mov low mov x7, v0.d[1] // AES final-2 block - mov high eor v22.8b, v22.8b, v4.8b // GHASH final-3 block - mid movi v8.8b, #0 // suppress further partial tag feed in pmull2 v9.1q, v4.2d, v15.2d // GHASH final-3 block - high pmull v10.1q, v22.1d, v10.1d // GHASH final-3 block - mid eor x6, x6, x13 // AES final-2 block - round N low pmull v11.1q, v4.1d, v15.1d // GHASH final-3 block - low eor x7, x7, x14 // AES final-2 block - round N high Ldec_blocks_more_than_2: // blocks left > 2 rev64 v4.16b, v5.16b // GHASH final-2 block ld1 { v5.16b}, [x0], #16 // AES final-1 block - load ciphertext eor v4.16b, v4.16b, v8.16b // feed in partial tag stp x6, x7, [x2], #16 // AES final-2 block - store result eor v0.16b, v5.16b, v2.16b // AES final-1 block - result mov d22, v4.d[1] // GHASH final-2 block - mid pmull v21.1q, v4.1d, v14.1d // GHASH final-2 block - low pmull2 v20.1q, v4.2d, v14.2d // GHASH final-2 block - high eor v22.8b, v22.8b, v4.8b // GHASH final-2 block - mid mov x6, v0.d[0] // AES final-1 block - mov low mov x7, v0.d[1] // AES final-1 block - mov high eor v11.16b, v11.16b, v21.16b // GHASH final-2 block - low movi v8.8b, #0 // suppress further partial tag feed in pmull v22.1q, v22.1d, v17.1d // GHASH final-2 block - mid eor v9.16b, v9.16b, v20.16b // GHASH final-2 block - high eor x6, x6, x13 // AES final-1 block - round N low eor v10.16b, v10.16b, v22.16b // GHASH final-2 block - mid eor x7, x7, x14 // AES final-1 block - round N high Ldec_blocks_more_than_1: // blocks left > 1 stp x6, x7, [x2], #16 // AES final-1 block - store result rev64 v4.16b, v5.16b // GHASH final-1 block ld1 { v5.16b}, [x0], #16 // AES final block - load ciphertext eor v4.16b, v4.16b, v8.16b // feed in partial tag movi v8.8b, #0 // suppress further partial tag feed in mov d22, v4.d[1] // GHASH final-1 block - mid eor v0.16b, v5.16b, v3.16b // AES final block - result pmull2 v20.1q, v4.2d, v13.2d // GHASH final-1 block - high eor v22.8b, v22.8b, v4.8b // GHASH final-1 block - mid pmull v21.1q, v4.1d, v13.1d // GHASH final-1 block - low mov x6, v0.d[0] // AES final block - mov low ins v22.d[1], v22.d[0] // GHASH final-1 block - mid mov x7, v0.d[1] // AES final block - mov high pmull2 v22.1q, v22.2d, v16.2d // GHASH final-1 block - mid eor x6, x6, x13 // AES final block - round N low eor v11.16b, v11.16b, v21.16b // GHASH final-1 block - low eor v9.16b, v9.16b, v20.16b // GHASH final-1 block - high eor v10.16b, v10.16b, v22.16b // GHASH final-1 block - mid eor x7, x7, x14 // AES final block - round N high Ldec_blocks_less_than_1: // blocks left <= 1 add x10, x10, x1, lsr #7 // Calculate the updated counter based on the number of 16B chunks we processed rev w10, w10 str w10, [x16, #12] // store the updated counter and x1, x1, #127 // bit_length %= 128 mvn x14, xzr // rkN_h = 0xffffffffffffffff sub x1, x1, #128 // bit_length -= 128 mvn x13, xzr // rkN_l = 0xffffffffffffffff ldp x4, x5, [x2] // load existing bytes we need to not overwrite neg x1, x1 // bit_length = 128 - #bits in input (in range [1,128]) and x1, x1, #127 // bit_length %= 128 lsr x14, x14, x1 // rkN_h is mask for top 64b of last block cmp x1, #64 csel x9, x13, x14, lt csel x10, x14, xzr, lt fmov d0, x9 // ctr0b is mask for last block and x6, x6, x9 mov v0.d[1], x10 bic x4, x4, x9 // mask out low existing bytes bic x5, x5, x10 // mask out high existing bytes orr x6, x6, x4 and x7, x7, x10 orr x7, x7, x5 and v5.16b, v5.16b, v0.16b // possibly partial last block has zeroes in highest bits rev64 v4.16b, v5.16b // GHASH final block eor v4.16b, v4.16b, v8.16b // feed in partial tag pmull v21.1q, v4.1d, v12.1d // GHASH final block - low mov d8, v4.d[1] // GHASH final block - mid eor v8.8b, v8.8b, v4.8b // GHASH final block - mid pmull2 v20.1q, v4.2d, v12.2d // GHASH final block - high pmull v8.1q, v8.1d, v16.1d // GHASH final block - mid eor v9.16b, v9.16b, v20.16b // GHASH final block - high eor v11.16b, v11.16b, v21.16b // GHASH final block - low eor v10.16b, v10.16b, v8.16b // GHASH final block - mid ldr d8, [sp, #128] eor v6.16b, v11.16b, v9.16b // MODULO - karatsuba tidy up eor v10.16b, v10.16b, v6.16b // MODULO - karatsuba tidy up pmull v7.1q, v9.1d, v8.1d // MODULO - top 64b align with mid ext v9.16b, v9.16b, v9.16b, #8 // MODULO - other top alignment eor v10.16b, v10.16b, v7.16b // MODULO - fold into mid eor v10.16b, v10.16b, v9.16b // MODULO - fold into mid pmull v8.1q, v10.1d, v8.1d // MODULO - mid 64b align with low ext v10.16b, v10.16b, v10.16b, #8 // MODULO - other mid alignment eor v11.16b, v11.16b, v8.16b // MODULO - fold into low stp x6, x7, [x2] eor v11.16b, v11.16b, v10.16b // MODULO - fold into low ext v11.16b, v11.16b, v11.16b, #8 rev64 v11.16b, v11.16b // Final Tag mov x0, x15 st1 { v11.16b }, [x3] // Store final tag ldp x19, x20, [sp, #16] ldp x21, x22, [sp, #32] ldp x23, x24, [sp, #48] ldp d8, d9, [sp, #64] ldp d10, d11, [sp, #80] ldp d12, d13, [sp, #96] ldp d14, d15, [sp, #112] ldp x29, x30, [sp], #224 AARCH64_VALIDATE_LINK_REGISTER ret .globl _aes_gcm_enc_kernel_eor3 .private_extern _aes_gcm_enc_kernel_eor3 .align 4 _aes_gcm_enc_kernel_eor3: AARCH64_SIGN_LINK_REGISTER stp x29, x30, [sp, #-224]! mov x29, sp ld1 { v0.16b}, [x4] // Load initial counter block stp x19, x20, [sp, #16] mov v1.16b, v0.16b // Initialize ctr1-3 from ctr0 mov v2.16b, v0.16b mov v3.16b, v0.16b mov x16, x4 // Pointer to counter block in memory mov x8, x5 // Pointer to AES key schedule context stp x21, x22, [sp, #32] // [sp, #48] is unused but allocated to align the stack layout with aes_gcm_dec_kernel_eor3 stp d8, d9, [sp, #64] // Save Neon registers stp d10, d11, [sp, #80] stp d12, d13, [sp, #96] stp d14, d15, [sp, #112] ldr w17, [x8, #240] // Load number of AES rounds add x7, x8, x17, lsl #4 // Calculate pointer to the last round key ldp x13, x14, [x7] // load round N key (for final XOR) ldr q31, [x7, #-16] // load round N-1 key add x4, x0, x1, lsr #3 // Calculate end of input lsr x5, x1, #3 // Total byte length mov x15, x5 ldr w12, [x16, #12] // Load counter's low 32 bits sub x5, x5, #1 // byte_len - 1 ldr q18, [x8, #0] // load rk0 and x5, x5, #0xffffffffffffffc0 // Align main loop end to a multiple of 64 bytes add x5, x5, x0 rev w12, w12 // Reverse for big-endian increment uxtw x10, w12 // Zero extend reversed w12 into x10 for final counter update // Pre-compute this value instead of using two instructions to reconstruct it every iteration mov x21, #0xc200000000000000 // GHASH reduction constant str x21, [sp, #128] // We maintain four copies of ctr values on the stack. Each loop iteration we // store the updated ctr value to the last four bytes (e.g., 160 + 12). // We then load the four values. This avoids a singificant number of // expensive GPR->NEON and NEON->NEON moves. To avoid LDST forwarding we // calculate and store the values one iteration ahead so they have time to // drain before we load them. str q0, [sp, #160] // Store base counter for block 0-3 str q0, [sp, #176] str q0, [sp, #192] str q0, [sp, #208] // Since we need the values right away don't go through the stack this first // time. Manually insert the incremented big-endian counter values. rev w20, w12 mov v0.s[3], w20 // ctr0 + 0 add w20, w12, #1 rev w20, w20 mov v1.s[3], w20 // ctr0 + 1 add w20, w12, #2 rev w20, w20 mov v2.s[3], w20 // ctr0 + 2 add w20, w12, #3 rev w20, w20 mov v3.s[3], w20 // ctr0 + 3 // Calculate the ctr values for the *next* (not current) group of four // blocks. Store the incremented parts to the stack. add w20, w12, #4 rev w20, w20 str w20, [sp, #172] // ctr0 + 4 for next iter add w20, w12, #5 rev w20, w20 str w20, [sp, #188] // ctr0 + 5 for next iter add w20, w12, #6 rev w20, w20 str w20, [sp, #204] // ctr0 + 6 for next iter add w20, w12, #7 rev w20, w20 str w20, [sp, #220] // ctr0 + 7 for next iter add w12, w12, #8 // Advance counter past these two sets // --- Start AES for first 4 blocks --- aese v0.16b, v18.16b aesmc v0.16b, v0.16b // AES block 0 - round 0 ldp q19, q20, [x8, #16] // load rk1, rk2 aese v1.16b, v18.16b aesmc v1.16b, v1.16b // AES block 1 - round 0 ldp q21, q22, [x8, #48] // load rk3, rk4 aese v2.16b, v18.16b aesmc v2.16b, v2.16b // AES block 2 - round 0 ldp q23, q24, [x8, #80] // load rk5, rk6 aese v3.16b, v18.16b aesmc v3.16b, v3.16b // AES block 3 - round 0 ldp q13, q14, [x6, #32] // load H2, H3 (GHASH keys) aese v0.16b, v19.16b aesmc v0.16b, v0.16b // AES block 0 - round 1 ldp q25, q26, [x8, #112] // load rk7, rk8 aese v1.16b, v19.16b aesmc v1.16b, v1.16b // AES block 1 - round 1 aese v2.16b, v19.16b aesmc v2.16b, v2.16b // AES block 2 - round 1 aese v3.16b, v19.16b aesmc v3.16b, v3.16b // AES block 3 - round 1 aese v0.16b, v20.16b aesmc v0.16b, v0.16b // AES block 0 - round 2 ext v14.16b, v14.16b, v14.16b, #8 // Byte swap H3 for GHASH aese v1.16b, v20.16b aesmc v1.16b, v1.16b // AES block 1 - round 2 ext v13.16b, v13.16b, v13.16b, #8 // Byte swap H2 for GHASH aese v2.16b, v20.16b aesmc v2.16b, v2.16b // AES block 2 - round 2 ldr q15, [x6, #80] // load H4 aese v3.16b, v20.16b aesmc v3.16b, v3.16b // AES block 3 - round 2 ext v15.16b, v15.16b, v15.16b, #8 // Byte swap H4 for GHASH aese v0.16b, v21.16b aesmc v0.16b, v0.16b // AES block 0 - round 3 ld1 { v11.16b}, [x3] // Load initial GHASH accumulator (T) aese v1.16b, v21.16b aesmc v1.16b, v1.16b // AES block 1 - round 3 ext v11.16b, v11.16b, v11.16b, #8 // Byte swap T for GHASH aese v2.16b, v21.16b aesmc v2.16b, v2.16b // AES block 2 - round 3 rev64 v11.16b, v11.16b // Correct byte order within 64-bit lanes aese v3.16b, v21.16b aesmc v3.16b, v3.16b // AES block 3 - round 3 trn2 v17.2d, v14.2d, v15.2d // Karatsuba key: H4_low | H3_low aese v0.16b, v22.16b aesmc v0.16b, v0.16b // AES block 0 - round 4 ldr q12, [x6] // load H1 aese v1.16b, v22.16b aesmc v1.16b, v1.16b // AES block 1 - round 4 ext v12.16b, v12.16b, v12.16b, #8 // Byte swap H1 for GHASH aese v2.16b, v22.16b aesmc v2.16b, v2.16b // AES block 2 - round 4 trn1 v9.2d, v14.2d, v15.2d // Karatsuba key: H4_high | H3_high aese v3.16b, v22.16b aesmc v3.16b, v3.16b // AES block 3 - round 4 trn2 v16.2d, v12.2d, v13.2d // Karatsuba key: H2_low | H1_low aese v0.16b, v23.16b aesmc v0.16b, v0.16b // AES block 0 - round 5 ldr q30, [x7] // Preload round N key for final EOR aese v1.16b, v23.16b aesmc v1.16b, v1.16b // AES block 1 - round 5 aese v3.16b, v23.16b aesmc v3.16b, v3.16b // AES block 3 - round 5 aese v2.16b, v23.16b aesmc v2.16b, v2.16b // AES block 2 - round 5 aese v0.16b, v24.16b aesmc v0.16b, v0.16b // AES block 0 - round 6 aese v1.16b, v24.16b aesmc v1.16b, v1.16b // AES block 1 - round 6 aese v2.16b, v24.16b aesmc v2.16b, v2.16b // AES block 2 - round 6 aese v3.16b, v24.16b aesmc v3.16b, v3.16b // AES block 3 - round 6 aese v0.16b, v25.16b aesmc v0.16b, v0.16b // AES block 0 - round 7 aese v1.16b, v25.16b aesmc v1.16b, v1.16b // AES block 1 - round 7 aese v2.16b, v25.16b aesmc v2.16b, v2.16b // AES block 2 - round 7 aese v3.16b, v25.16b aesmc v3.16b, v3.16b // AES block 3 - round 7 aese v0.16b, v26.16b aesmc v0.16b, v0.16b // AES block 0 - round 8 aese v1.16b, v26.16b aesmc v1.16b, v1.16b // AES block 1 - round 8 aese v2.16b, v26.16b aesmc v2.16b, v2.16b // AES block 2 - round 8 aese v3.16b, v26.16b aesmc v3.16b, v3.16b // AES block 3 - round 8 cmp x17, #12 // setup flags for AES-128/192/256 check b.lt Lenc_finish_first_blocks_eor3 // branch if AES-128 ldp q27, q28, [x8, #144] // load rk9, rk10 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 9 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 9 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 9 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 9 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 10 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 10 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 10 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 10 b.eq Lenc_finish_first_blocks_eor3 // branch if AES-192 ldp q27, q28, [x8, #176] // load rk11, rk12 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 11 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 11 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 11 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 11 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 12 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 12 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 12 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 12 Lenc_finish_first_blocks_eor3: cmp x0, x5 // check if we have <= 4 blocks to process in the tail eor v17.16b, v17.16b, v9.16b // Karatsuba key: H3^H4 aese v0.16b, v31.16b // AES block 0 - round N-1 aese v1.16b, v31.16b // AES block 1 - round N-1 aese v2.16b, v31.16b // AES block 2 - round N-1 aese v3.16b, v31.16b // AES block 3 - round N-1 trn1 v8.2d, v12.2d, v13.2d // Karatsuba key: H2_high | H1_high eor v16.16b, v16.16b, v8.16b // Karatsuba key: H1^H2 b.ge Lenc_tail_eor3 // handle tail if no more full 4-block sets ldp q6, q7, [x0, #32] // AES blocks 2,3 load plaintext ldp q4, q5, [x0], #64 // AES blocks 0,1 load plaintext // Compute and store first 4 ciphertext blocks eor3 v4.16b, v4.16b, v30.16b, v0.16b // AES block 0 - result = PT ^ AES(ctr0) eor3 v5.16b, v5.16b, v30.16b, v1.16b // AES block 1 - result = PT ^ AES(ctr1) eor3 v6.16b, v6.16b, v30.16b, v2.16b // AES block 2 - result = PT ^ AES(ctr2) eor3 v7.16b, v7.16b, v30.16b, v3.16b // AES block 3 - result = PT ^ AES(ctr3) st1 { v4.16b, v5.16b, v6.16b, v7.16b}, [x2], #64 // AES blocks 0-3 - store result // Load counter values for the second iteration from the stack ldp q0, q1, [sp, #160] ldp q2, q3, [sp, #192] // Prepare and store counter values for the third iteration rev w20, w12 str w20, [sp, #172] // ctr + 8 add w20, w12, #1 rev w20, w20 str w20, [sp, #188] // ctr + 9 add w20, w12, #2 rev w20, w20 str w20, [sp, #204] // ctr + 10 add w20, w12, #3 rev w20, w20 str w20, [sp, #220] // ctr + 11 add w12, w12, #4 // Advance counter base cmp x0, x5 // check if we have <= 4 blocks remaining b.ge Lenc_prepretail_eor3 // go to prepretail if < 2 full loops left Lenc_main_loop_eor3: // main loop start (processes 4 blocks per iteration) // --- AES Pipeline for blocks 4k+4 to 4k+7 --- aese v0.16b, v18.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 0 aese v1.16b, v18.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 0 aese v2.16b, v18.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 0 aese v3.16b, v18.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 0 ldr d8, [sp, #128] // Load GHASH reduction constant aese v0.16b, v19.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 1 aese v1.16b, v19.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 1 aese v2.16b, v19.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 1 aese v3.16b, v19.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 1 // --- GHASH Pipeline (interleaved with AES) for blocks 4k to 4k+3 --- rev64 v4.16b, v4.16b // GHASH block 4k - Byte swap CT rev64 v5.16b, v5.16b // GHASH block 4k+1 - Byte swap CT rev64 v6.16b, v6.16b // GHASH block 4k+2 - Byte swap CT rev64 v7.16b, v7.16b // GHASH block 4k+3 - Byte swap CT aese v0.16b, v20.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 2 ext v11.16b, v11.16b, v11.16b, #8 // GHASH - prepare acc for XOR aese v1.16b, v20.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 2 eor v4.16b, v4.16b, v11.16b // GHASH block 4k - Y_i = CT_i ^ Y_{i-1} aese v2.16b, v20.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 2 pmull v11.1q, v4.1d, v15.1d // GHASH block 4k - low aese v3.16b, v20.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 2 pmull2 v9.1q, v6.2d, v13.2d // GHASH block 4k+2 - high aese v0.16b, v21.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 3 mov d10, v17.d[1] // GHASH block 4k - mid Karatsuba key aese v1.16b, v21.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 3 mov d20, v4.d[1] // GHASH block 4k - mid aese v2.16b, v21.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 3 eor v20.8b, v20.8b, v4.8b // GHASH block 4k - mid aese v3.16b, v21.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 3 mov d21, v5.d[1] // GHASH block 4k+1 - mid aese v0.16b, v22.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 4 eor v21.8b, v21.8b, v5.8b // GHASH block 4k+1 - mid aese v1.16b, v22.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 4 pmull v10.1q, v20.1d, v10.1d // GHASH block 4k - mid aese v2.16b, v22.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 4 pmull v21.1q, v21.1d, v17.1d // GHASH block 4k+1 - mid aese v3.16b, v22.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 4 eor v10.16b, v10.16b, v21.16b // GHASH block 4k+1 - mid aese v0.16b, v23.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 5 ext v22.16b, v22.16b, v6.16b, #8 // GHASH block 4k+2 - mid aese v1.16b, v23.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 5 eor v22.16b, v22.16b, v6.16b // GHASH block 4k+2 - mid aese v2.16b, v23.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 5 pmull2 v22.1q, v22.2d, v16.2d // GHASH block 4k+2 - mid aese v3.16b, v23.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 5 mov d23, v7.d[1] // GHASH block 4k+3 - mid aese v0.16b, v24.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 6 eor v23.8b, v23.8b, v7.8b // GHASH block 4k+3 - mid aese v1.16b, v24.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 6 pmull v23.1q, v23.1d, v16.1d // GHASH block 4k+3 - mid aese v2.16b, v24.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 6 eor3 v10.16b, v10.16b, v22.16b, v23.16b // GHASH block 4k+2/3 - mid aese v3.16b, v24.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 6 pmull2 v22.1q, v4.2d, v15.2d // GHASH block 4k - high aese v0.16b, v25.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 7 pmull2 v21.1q, v7.2d, v12.2d // GHASH block 4k+3 - high eor v22.16b, v22.16b, v21.16b // GHASH block 4k+3 - high aese v1.16b, v25.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 7 pmull2 v23.1q, v5.2d, v14.2d // GHASH block 4k+1 - high aese v2.16b, v25.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 7 pmull v21.1q, v6.1d, v13.1d // GHASH block 4k+2 - low aese v3.16b, v25.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 7 pmull v20.1q, v5.1d, v14.1d // GHASH block 4k+1 - low eor3 v9.16b, v9.16b, v22.16b, v23.16b // GHASH block 4k/1/2/3 - high pmull v22.1q, v7.1d, v12.1d // GHASH block 4k+3 - low ldp q6, q7, [x0, #32] ldp q4, q5, [x0], #64 eor v20.16b, v20.16b, v21.16b // GHASH block 4k+1 - low aese v0.16b, v26.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 8 eor3 v11.16b, v11.16b, v22.16b, v20.16b // GHASH block 4k/1/2/3 - low aese v1.16b, v26.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 8 eor3 v10.16b, v10.16b, v9.16b, v11.16b // MODULO - karatsuba tidy up aese v2.16b, v26.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 8 pmull v20.1q, v9.1d, v8.1d // MODULO - top 64b align with mid aese v3.16b, v26.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 8 cmp x17, #12 // setup flags for AES-128/192/256 check b.lt Lenc_main_loop_continue_eor3 // branch if AES-128 ldp q27, q28, [x8, #144] // load rk9, rk10 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 9 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 9 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 9 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 9 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 10 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 10 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 10 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 10 b.eq Lenc_main_loop_continue_eor3 // branch if AES-192 ldp q27, q28, [x8, #176] // load rk11, rk12 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 11 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 11 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 11 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 11 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 12 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 12 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 12 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 12 Lenc_main_loop_continue_eor3: ext v9.16b, v9.16b, v9.16b, #8 // MODULO - other top alignment eor3 v10.16b, v10.16b, v20.16b, v9.16b // MODULO - fold into mid pmull v9.1q, v10.1d, v8.1d // MODULO - mid 64b align with low ext v20.16b, v10.16b, v10.16b, #8 // MODULO - other mid alignment eor3 v11.16b, v9.16b, v11.16b, v20.16b // MODULO - fold into low aese v0.16b, v31.16b // AES block 4k+4 - round N-1 eor3 v4.16b, v4.16b, v30.16b, v0.16b // AES block 4k+4 - result aese v1.16b, v31.16b // AES block 4k+5 - round N-1 eor3 v5.16b, v5.16b, v30.16b, v1.16b // AES block 4k+5 - result aese v2.16b, v31.16b // AES block 4k+6 - round N-1 eor3 v6.16b, v6.16b, v30.16b, v2.16b // AES block 4k+6 - result aese v3.16b, v31.16b // AES block 4k+7 - round N-1 eor3 v7.16b, v7.16b, v30.16b, v3.16b // AES block 4k+7 - result ldp q0, q1, [sp, #160] ldp q2, q3, [sp, #192] // We used these registers as temporaries above so reload the RKs. ldp q20, q21, [x8, #32] // load rk2, rk3 ldp q22, q23, [x8, #64] // load rk4, rk5 st1 { v4.16b, v5.16b, v6.16b, v7.16b}, [x2], #64 // AES blocks 4k+4-7 - store result rev w20, w12 str w20, [sp, #172] add w20, w12, #1 rev w20, w20 str w20, [sp, #188] add w20, w12, #2 rev w20, w20 str w20, [sp, #204] add w20, w12, #3 rev w20, w20 str w20, [sp, #220] add w12, w12, #4 cmp x0, x5 // LOOP_eor3 CONTROL b.lt Lenc_main_loop_eor3 Lenc_prepretail_eor3: // PREPRETAIL aese v1.16b, v18.16b aesmc v1.16b, v1.16b // AES block 1 - round 0 rev64 v6.16b, v6.16b // GHASH block 2 aese v2.16b, v18.16b aesmc v2.16b, v2.16b // AES block 2 - round 0 aese v0.16b, v18.16b aesmc v0.16b, v0.16b // AES block 0 - round 0 rev64 v4.16b, v4.16b // GHASH block 0 ext v11.16b, v11.16b, v11.16b, #8 // PRE 0 aese v2.16b, v19.16b aesmc v2.16b, v2.16b // AES block 2 - round 1 aese v0.16b, v19.16b aesmc v0.16b, v0.16b // AES block 0 - round 1 eor v4.16b, v4.16b, v11.16b // PRE 1 rev64 v5.16b, v5.16b // GHASH block 1 aese v2.16b, v20.16b aesmc v2.16b, v2.16b // AES block 2 - round 2 aese v3.16b, v18.16b aesmc v3.16b, v3.16b // AES block 3 - round 0 mov d10, v17.d[1] // GHASH block 0 - mid Karatsuba key aese v1.16b, v19.16b aesmc v1.16b, v1.16b // AES block 1 - round 1 pmull v11.1q, v4.1d, v15.1d // GHASH block 0 - low mov d8, v4.d[1] // GHASH block 0 - mid pmull2 v9.1q, v4.2d, v15.2d // GHASH block 0 - high aese v2.16b, v21.16b aesmc v2.16b, v2.16b // AES block 2 - round 3 aese v1.16b, v20.16b aesmc v1.16b, v1.16b // AES block 1 - round 2 eor v8.8b, v8.8b, v4.8b // GHASH block 0 - mid aese v0.16b, v20.16b aesmc v0.16b, v0.16b // AES block 0 - round 2 aese v3.16b, v19.16b aesmc v3.16b, v3.16b // AES block 3 - round 1 aese v1.16b, v21.16b aesmc v1.16b, v1.16b // AES block 1 - round 3 pmull v10.1q, v8.1d, v10.1d // GHASH block 0 - mid pmull2 v4.1q, v5.2d, v14.2d // GHASH block 1 - high pmull v8.1q, v5.1d, v14.1d // GHASH block 1 - low aese v3.16b, v20.16b aesmc v3.16b, v3.16b // AES block 3 - round 2 eor v9.16b, v9.16b, v4.16b // GHASH block 1 - high mov d4, v5.d[1] // GHASH block 1 - mid aese v0.16b, v21.16b aesmc v0.16b, v0.16b // AES block 0 - round 3 eor v11.16b, v11.16b, v8.16b // GHASH block 1 - low aese v3.16b, v21.16b aesmc v3.16b, v3.16b // AES block 3 - round 3 eor v4.8b, v4.8b, v5.8b // GHASH block 1 - mid mov d8, v6.d[1] // GHASH block 2 - mid aese v0.16b, v22.16b aesmc v0.16b, v0.16b // AES block 0 - round 4 rev64 v7.16b, v7.16b // GHASH block 3 aese v3.16b, v22.16b aesmc v3.16b, v3.16b // AES block 3 - round 4 pmull v4.1q, v4.1d, v17.1d // GHASH block 1 - mid eor v8.8b, v8.8b, v6.8b // GHASH block 2 - mid pmull v5.1q, v6.1d, v13.1d // GHASH block 2 - low aese v3.16b, v23.16b aesmc v3.16b, v3.16b // AES block 3 - round 5 aese v2.16b, v22.16b aesmc v2.16b, v2.16b // AES block 2 - round 4 eor v10.16b, v10.16b, v4.16b // GHASH block 1 - mid pmull2 v4.1q, v6.2d, v13.2d // GHASH block 2 - high eor v11.16b, v11.16b, v5.16b // GHASH block 2 - low ins v8.d[1], v8.d[0] // GHASH block 2 - mid aese v2.16b, v23.16b aesmc v2.16b, v2.16b // AES block 2 - round 5 eor v9.16b, v9.16b, v4.16b // GHASH block 2 - high mov d4, v7.d[1] // GHASH block 3 - mid aese v1.16b, v22.16b aesmc v1.16b, v1.16b // AES block 1 - round 4 pmull2 v8.1q, v8.2d, v16.2d // GHASH block 2 - mid eor v4.8b, v4.8b, v7.8b // GHASH block 3 - mid pmull2 v5.1q, v7.2d, v12.2d // GHASH block 3 - high aese v1.16b, v23.16b aesmc v1.16b, v1.16b // AES block 1 - round 5 pmull v4.1q, v4.1d, v16.1d // GHASH block 3 - mid eor v10.16b, v10.16b, v8.16b // GHASH block 2 - mid aese v0.16b, v23.16b aesmc v0.16b, v0.16b // AES block 0 - round 5 aese v1.16b, v24.16b aesmc v1.16b, v1.16b // AES block 1 - round 6 aese v2.16b, v24.16b aesmc v2.16b, v2.16b // AES block 2 - round 6 aese v0.16b, v24.16b aesmc v0.16b, v0.16b // AES block 0 - round 6 aese v3.16b, v24.16b aesmc v3.16b, v3.16b // AES block 3 - round 6 aese v1.16b, v25.16b aesmc v1.16b, v1.16b // AES block 1 - round 7 eor v9.16b, v9.16b, v5.16b // GHASH block 3 - high aese v0.16b, v25.16b aesmc v0.16b, v0.16b // AES block 0 - round 7 aese v3.16b, v25.16b aesmc v3.16b, v3.16b // AES block 3 - round 7 ldr d8, [sp, #128] aese v1.16b, v26.16b aesmc v1.16b, v1.16b // AES block 1 - round 8 eor v10.16b, v10.16b, v4.16b // GHASH block 3 - mid pmull v6.1q, v7.1d, v12.1d // GHASH block 3 - low aese v3.16b, v26.16b aesmc v3.16b, v3.16b // AES block 3 - round 8 cmp x17, #12 // setup flags for AES-128/192/256 check aese v0.16b, v26.16b aesmc v0.16b, v0.16b // AES block 0 - round 8 eor v11.16b, v11.16b, v6.16b // GHASH block 3 - low aese v2.16b, v25.16b aesmc v2.16b, v2.16b // AES block 2 - round 7 eor v10.16b, v10.16b, v9.16b // karatsuba tidy up aese v2.16b, v26.16b aesmc v2.16b, v2.16b // AES block 2 - round 8 pmull v4.1q, v9.1d, v8.1d ext v9.16b, v9.16b, v9.16b, #8 eor v10.16b, v10.16b, v11.16b b.lt Lenc_finish_prepretail_eor3 // branch if AES-128 ldp q27, q28, [x8, #144] // load rk9, rk10 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 9 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 9 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 9 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 9 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 10 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 10 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 10 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 10 b.eq Lenc_finish_prepretail_eor3 // branch if AES-192 ldp q27, q28, [x8, #176] // load rk11, rk12 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 11 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 11 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 11 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 11 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 12 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 12 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 12 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 12 Lenc_finish_prepretail_eor3: aese v0.16b, v31.16b // AES block 0 - round N-1 aese v1.16b, v31.16b // AES block 1 - round N-1 aese v2.16b, v31.16b // AES block 2 - round N-1 aese v3.16b, v31.16b // AES block 3 - round N-1 eor3 v10.16b, v10.16b, v4.16b, v9.16b pmull v4.1q, v10.1d, v8.1d ext v10.16b, v10.16b, v10.16b, #8 eor3 v11.16b, v11.16b, v4.16b, v10.16b Lenc_tail_eor3: // TAIL: Process remaining 0 to 3 blocks ext v8.16b, v11.16b, v11.16b, #8 // Save current GHASH state for partial tag feed-in sub x5, x4, x0 // main_end_input_ptr is number of bytes left to process ldp x6, x7, [x0], #16 // AES block 0 - load plaintext eor x6, x6, x13 // AES block 0 - round N low eor x7, x7, x14 // AES block 0 - round N high cmp x5, #48 fmov d4, x6 // AES block 0 - mov low fmov v4.d[1], x7 // AES block 0 - mov high eor v5.16b, v4.16b, v0.16b // AES block 0 - result b.gt Lenc_blocks_more_than_3_eor3 cmp x5, #32 mov v3.16b, v2.16b movi v11.8b, #0 movi v9.8b, #0 mov v2.16b, v1.16b movi v10.8b, #0 b.gt Lenc_blocks_more_than_2_eor3 mov v3.16b, v1.16b cmp x5, #16 b.gt Lenc_blocks_more_than_1_eor3 b Lenc_blocks_less_than_1_eor3 Lenc_blocks_more_than_3_eor3: // blocks left > 3 st1 { v5.16b}, [x2], #16 // AES final-2 block - store result ldp x6, x7, [x0], #16 // AES final-2 block - load input low & high rev64 v4.16b, v5.16b // GHASH final-3 block eor x6, x6, x13 // AES final-2 block - round N low eor v4.16b, v4.16b, v8.16b // feed in partial tag eor x7, x7, x14 // AES final-2 block - round N high mov d22, v4.d[1] // GHASH final-3 block - mid fmov d5, x6 // AES final-2 block - mov low fmov v5.d[1], x7 // AES final-2 block - mov high eor v22.8b, v22.8b, v4.8b // GHASH final-3 block - mid movi v8.8b, #0 // suppress further partial tag feed in mov d10, v17.d[1] // GHASH final-3 block - mid pmull v11.1q, v4.1d, v15.1d // GHASH final-3 block - low pmull2 v9.1q, v4.2d, v15.2d // GHASH final-3 block - high pmull v10.1q, v22.1d, v10.1d // GHASH final-3 block - mid eor v5.16b, v5.16b, v1.16b // AES final-2 block - result Lenc_blocks_more_than_2_eor3: // blocks left > 2 st1 { v5.16b}, [x2], #16 // AES final-2 block - store result ldp x6, x7, [x0], #16 // AES final-1 block - load input low & high rev64 v4.16b, v5.16b // GHASH final-2 block eor x6, x6, x13 // AES final-1 block - round N low eor v4.16b, v4.16b, v8.16b // feed in partial tag fmov d5, x6 // AES final-1 block - mov low eor x7, x7, x14 // AES final-1 block - round N high fmov v5.d[1], x7 // AES final-1 block - mov high movi v8.8b, #0 // suppress further partial tag feed in pmull2 v20.1q, v4.2d, v14.2d // GHASH final-2 block - high mov d22, v4.d[1] // GHASH final-2 block - mid pmull v21.1q, v4.1d, v14.1d // GHASH final-2 block - low eor v22.8b, v22.8b, v4.8b // GHASH final-2 block - mid eor v5.16b, v5.16b, v2.16b // AES final-1 block - result eor v9.16b, v9.16b, v20.16b // GHASH final-2 block - high pmull v22.1q, v22.1d, v17.1d // GHASH final-2 block - mid eor v11.16b, v11.16b, v21.16b // GHASH final-2 block - low eor v10.16b, v10.16b, v22.16b // GHASH final-2 block - mid Lenc_blocks_more_than_1_eor3: // blocks left > 1 st1 { v5.16b}, [x2], #16 // AES final-1 block - store result rev64 v4.16b, v5.16b // GHASH final-1 block: Byte Swap CT ldp x6, x7, [x0], #16 // AES final block - load plaintext eor v4.16b, v4.16b, v8.16b // Feed in partial tag movi v8.8b, #0 // Clear for next block eor x6, x6, x13 // AES final block - round N low mov d22, v4.d[1] // GHASH final-1 block - mid pmull2 v20.1q, v4.2d, v13.2d // GHASH final-1 block - high eor x7, x7, x14 // AES final block - round N high eor v22.8b, v22.8b, v4.8b // GHASH final-1 block - mid eor v9.16b, v9.16b, v20.16b // GHASH final-1 block - high ins v22.d[1], v22.d[0] // GHASH final-1 block - mid fmov d5, x6 // AES final block - mov low fmov v5.d[1], x7 // AES final block - mov high pmull2 v22.1q, v22.2d, v16.2d // GHASH final-1 block - mid pmull v21.1q, v4.1d, v13.1d // GHASH final-1 block - low eor v5.16b, v5.16b, v3.16b // AES final block - result eor v10.16b, v10.16b, v22.16b // GHASH final-1 block - mid eor v11.16b, v11.16b, v21.16b // GHASH final-1 block - low Lenc_blocks_less_than_1_eor3: // Last partial block handling add x10, x10, x1, lsr #7 // Calculate the updated counter based on the number of 16B chunks we processed rev w10, w10 str w10, [x16, #12] // store the updated counter and x1, x1, #127 // bit_length %= 128 mvn x13, xzr // Mask for low 64 bits sub x1, x1, #128 // neg x1, x1 // Valid bits in the last block (1-128) ldr q18, [x2] // Load destination for merging mvn x14, xzr // Mask for high 64 bits and x1, x1, #127 // bit_length %= 128 lsr x14, x14, x1 // rkN_h is mask for top 64b of last block cmp x1, #64 csel x6, x13, x14, lt csel x7, x14, xzr, lt fmov d0, x6 // ctr0d is mask for last block fmov v0.d[1], x7 and v5.16b, v5.16b, v0.16b // Mask out unused bits of the last CT block rev64 v4.16b, v5.16b // GHASH final block - byte swap eor v4.16b, v4.16b, v8.16b // Feed in partial tag bif v5.16b, v18.16b, v0.16b // Bitwise Insert: merge with existing data at output_ptr pmull2 v20.1q, v4.2d, v12.2d // GHASH final block - high mov d8, v4.d[1] // GHASH final block - mid pmull v21.1q, v4.1d, v12.1d // GHASH final block - low eor v9.16b, v9.16b, v20.16b // GHASH final block - high eor v8.8b, v8.8b, v4.8b // GHASH final block - mid pmull v8.1q, v8.1d, v16.1d // GHASH final block - mid eor v11.16b, v11.16b, v21.16b // GHASH final block - low eor v10.16b, v10.16b, v8.16b // GHASH final block - mid eor v4.16b, v11.16b, v9.16b // MODULO - karatsuba tidy up fmov d8, x21 eor v10.16b, v10.16b, v4.16b // MODULO - karatsuba tidy up pmull v7.1q, v9.1d, v8.1d // MODULO - top 64b align with mid ext v9.16b, v9.16b, v9.16b, #8 // MODULO - other top alignment eor3 v10.16b, v10.16b, v7.16b, v9.16b // MODULO - fold into mid pmull v9.1q, v10.1d, v8.1d // MODULO - mid 64b align with low ext v10.16b, v10.16b, v10.16b, #8 // MODULO - other mid alignment st1 { v5.16b}, [x2] // store all 16B eor3 v11.16b, v11.16b, v9.16b, v10.16b // MODULO - fold into low ext v11.16b, v11.16b, v11.16b, #8 // Byte swap GHASH result rev64 v11.16b, v11.16b // Final Tag mov x0, x15 st1 { v11.16b }, [x3] // Store final tag ldp x19, x20, [sp, #16] ldp x21, x22, [sp, #32] ldp d8, d9, [sp, #64] ldp d10, d11, [sp, #80] ldp d12, d13, [sp, #96] ldp d14, d15, [sp, #112] ldp x29, x30, [sp], #224 AARCH64_VALIDATE_LINK_REGISTER ret .globl _aes_gcm_dec_kernel_eor3 .private_extern _aes_gcm_dec_kernel_eor3 .align 4 _aes_gcm_dec_kernel_eor3: AARCH64_SIGN_LINK_REGISTER stp x29, x30, [sp, #-224]! mov x29, sp stp x19, x20, [sp, #16] ld1 { v0.16b}, [x4] mov v1.16b, v0.16b mov v2.16b, v0.16b mov v3.16b, v0.16b mov x16, x4 mov x8, x5 stp x21, x22, [sp, #32] stp x23, x24, [sp, #48] stp d8, d9, [sp, #64] stp d10, d11, [sp, #80] stp d12, d13, [sp, #96] stp d14, d15, [sp, #112] ldr w17, [x8, #240] // Load number of AES rounds add x19, x8, x17, lsl #4 // borrow input_l1 for last key ldp x13, x14, [x19] // load round N keys ldr q31, [x19, #-16] // load round N-1 keys add x4, x0, x1, lsr #3 // end_input_ptr lsr x5, x1, #3 // byte_len mov x15, x5 ldr w9, [x16, #12] // Load scalar 32-bit counter (CTR) sub x5, x5, #1 // byte_len - 1 ldr q18, [x8, #0] // load rk0 and x5, x5, #0xffffffffffffffc0 // number of bytes to be processed in main loop (at least 1 byte must be handled by tail) add x5, x5, x0 rev w9, w9 // Reverse it once for big-endian incrementing uxtw x10, w9 // Zero extend reversed w9 into x10 str q0, [sp, #160] str q0, [sp, #176] str q0, [sp, #192] str q0, [sp, #208] rev w20, w9 mov v0.s[3], w20 add w20, w9, #1 rev w20, w20 mov v1.s[3], w20 add w20, w9, #2 rev w20, w20 mov v2.s[3], w20 add w20, w9, #3 rev w20, w20 mov v3.s[3], w20 add w20, w9, #4 rev w20, w20 str w20, [sp, #172] add w20, w9, #5 rev w20, w20 str w20, [sp, #188] add w20, w9, #6 rev w20, w20 str w20, [sp, #204] add w20, w9, #7 rev w20, w20 str w20, [sp, #220] add w9, w9, #8 // Pre-compute this value instead of using two instructions for moving and then shifting in the main loop mov x21, #0xc200000000000000 str x21, [sp, #128] aese v0.16b, v18.16b aesmc v0.16b, v0.16b // AES block 0 - round 0 ldp q19, q20, [x8, #16] // load rk1, rk2 aese v1.16b, v18.16b aesmc v1.16b, v1.16b // AES block 1 - round 0 ldp q21, q22, [x8, #48] // load rk3, rk4 aese v2.16b, v18.16b aesmc v2.16b, v2.16b // AES block 2 - round 0 ldp q23, q24, [x8, #80] // load rk5, rk6 aese v3.16b, v18.16b aesmc v3.16b, v3.16b // AES block 3 - round 0 ldp q13, q14, [x6, #32] // load h2, h3 aese v0.16b, v19.16b aesmc v0.16b, v0.16b // AES block 0 - round 1 ldp q25, q26, [x8, #112] // load rk7, rk8 aese v1.16b, v19.16b aesmc v1.16b, v1.16b // AES block 1 - round 1 aese v2.16b, v19.16b aesmc v2.16b, v2.16b // AES block 2 - round 1 aese v3.16b, v19.16b aesmc v3.16b, v3.16b // AES block 3 - round 1 aese v0.16b, v20.16b aesmc v0.16b, v0.16b // AES block 0 - round 2 ext v14.16b, v14.16b, v14.16b, #8 aese v1.16b, v20.16b aesmc v1.16b, v1.16b // AES block 1 - round 2 ext v13.16b, v13.16b, v13.16b, #8 ldr q15, [x6, #80] // load h4 aese v2.16b, v20.16b aesmc v2.16b, v2.16b // AES block 2 - round 2 aese v3.16b, v20.16b aesmc v3.16b, v3.16b // AES block 3 - round 2 ext v15.16b, v15.16b, v15.16b, #8 aese v0.16b, v21.16b aesmc v0.16b, v0.16b // AES block 0 - round 3 ld1 { v11.16b}, [x3] aese v1.16b, v21.16b aesmc v1.16b, v1.16b // AES block 1 - round 3 ext v11.16b, v11.16b, v11.16b, #8 aese v2.16b, v21.16b aesmc v2.16b, v2.16b // AES block 2 - round 3 rev64 v11.16b, v11.16b aese v3.16b, v21.16b aesmc v3.16b, v3.16b // AES block 3 - round 3 trn2 v17.2d, v14.2d, v15.2d // h4l | h3l aese v0.16b, v22.16b aesmc v0.16b, v0.16b // AES block 0 - round 4 ldr q12, [x6] // load h1 aese v1.16b, v22.16b aesmc v1.16b, v1.16b // AES block 1 - round 4 ext v12.16b, v12.16b, v12.16b, #8 aese v2.16b, v22.16b aesmc v2.16b, v2.16b // AES block 2 - round 4 trn1 v9.2d, v14.2d, v15.2d // h4h | h3h aese v3.16b, v22.16b aesmc v3.16b, v3.16b // AES block 3 - round 4 trn2 v16.2d, v12.2d, v13.2d // h2l | h1l aese v0.16b, v23.16b aesmc v0.16b, v0.16b // AES block 0 - round 5 aese v1.16b, v23.16b aesmc v1.16b, v1.16b // AES block 1 - round 5 aese v3.16b, v23.16b aesmc v3.16b, v3.16b // AES block 3 - round 5 aese v2.16b, v23.16b aesmc v2.16b, v2.16b // AES block 2 - round 5 aese v0.16b, v24.16b aesmc v0.16b, v0.16b // AES block 0 - round 6 aese v1.16b, v24.16b aesmc v1.16b, v1.16b // AES block 1 - round 6 aese v2.16b, v24.16b aesmc v2.16b, v2.16b // AES block 2 - round 6 aese v3.16b, v24.16b aesmc v3.16b, v3.16b // AES block 3 - round 6 aese v0.16b, v25.16b aesmc v0.16b, v0.16b // AES block 0 - round 7 aese v1.16b, v25.16b aesmc v1.16b, v1.16b // AES block 1 - round 7 aese v2.16b, v25.16b aesmc v2.16b, v2.16b // AES block 2 - round 7 aese v3.16b, v25.16b aesmc v3.16b, v3.16b // AES block 3 - round 7 aese v0.16b, v26.16b aesmc v0.16b, v0.16b // AES block 0 - round 8 aese v1.16b, v26.16b aesmc v1.16b, v1.16b // AES block 1 - round 8 aese v2.16b, v26.16b aesmc v2.16b, v2.16b // AES block 2 - round 8 aese v3.16b, v26.16b aesmc v3.16b, v3.16b // AES block 3 - round 8 cmp x17, #12 // setup flags for AES-128/192/256 check b.lt Ldec_finish_first_blocks_eor3 // branch if AES-128 ldp q27, q28, [x8, #144] // load rk9, rk10 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 9 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 9 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 9 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 9 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 10 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 10 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 10 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 10 b.eq Ldec_finish_first_blocks_eor3 // branch if AES-192 ldp q27, q28, [x8, #176] // load rk11, rk12 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 11 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 11 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 11 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 11 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 12 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 12 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 12 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 12 Ldec_finish_first_blocks_eor3: ldr q27, [x19] // load rkN cmp x0, x5 // check if we have <= 4 blocks eor v17.16b, v17.16b, v9.16b // h4k | h3k aese v1.16b, v31.16b // AES block 1 - round N-1 aese v2.16b, v31.16b // AES block 2 - round N-1 aese v3.16b, v31.16b // AES block 3 - round N-1 aese v0.16b, v31.16b // AES block 0 - round N-1 trn1 v8.2d, v12.2d, v13.2d // h2h | h1h eor v16.16b, v16.16b, v8.16b // h2k | h1k b.ge Ldec_tail_eor3 // handle tail // Setup for AES blocks 0-3 is done purely on NEON side instead of mixing NEON and scalar instructions. // This is because the final result of the AES block needs to be EORd with the final round key // value (v30). This avoids several fmovs. ldp q6, q7, [x0, #32] // AES blocks 2,3 load ciphertext ldp q4, q5, [x0], #64 // AES blocks 0,1 load ciphertext eor3 v0.16b, v4.16b, v0.16b, v27.16b // AES block 0 - result eor3 v1.16b, v5.16b, v1.16b, v27.16b // AES block 1 - result eor3 v2.16b, v6.16b, v2.16b, v27.16b // AES block 2 - result eor3 v3.16b, v7.16b, v3.16b, v27.16b // AES block 3 - result st1 { v0.16b, v1.16b, v2.16b, v3.16b}, [x2], #64 // AES blocks 0-3 - store result ldr q0, [sp, #160] ldr q1, [sp, #176] ldr q2, [sp, #192] ldr q3, [sp, #208] rev w20, w9 str w20, [sp, #172] add w20, w9, #1 rev w20, w20 str w20, [sp, #188] add w20, w9, #2 rev w20, w20 str w20, [sp, #204] add w20, w9, #3 rev w20, w20 str w20, [sp, #220] add w9, w9, #4 cmp x0, x5 // check if we have <= 4 blocks b.ge Ldec_prepretail_eor3 // do prepretail Ldec_main_loop_eor3: // main loop start aese v0.16b, v18.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 0 aese v1.16b, v18.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 0 aese v2.16b, v18.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 0 aese v3.16b, v18.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 0 aese v0.16b, v19.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 1 aese v1.16b, v19.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 1 aese v2.16b, v19.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 1 aese v3.16b, v19.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 1 rev64 v4.16b, v4.16b // GHASH block 4k rev64 v5.16b, v5.16b // GHASH block 4k+1 rev64 v6.16b, v6.16b // GHASH block 4k+2 rev64 v7.16b, v7.16b // GHASH block 4k+3 aese v0.16b, v20.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 2 ext v11.16b, v11.16b, v11.16b, #8 // PRE 0 aese v1.16b, v20.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 2 eor v4.16b, v4.16b, v11.16b // PRE 1 aese v2.16b, v20.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 2 pmull v11.1q, v4.1d, v15.1d // GHASH block 4k - low aese v3.16b, v20.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 2 pmull2 v9.1q, v4.2d, v15.2d // GHASH block 4k - high aese v0.16b, v21.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 3 mov d10, v17.d[1] // GHASH block 4k - mid aese v1.16b, v21.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 3 mov d8, v4.d[1] // GHASH block 4k - mid aese v2.16b, v21.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 3 eor v8.8b, v8.8b, v4.8b // GHASH block 4k - mid aese v3.16b, v21.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 3 aese v0.16b, v22.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 4 pmull2 v4.1q, v5.2d, v14.2d // GHASH block 4k+1 - high aese v1.16b, v22.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 4 eor v9.16b, v9.16b, v4.16b // GHASH block 4k+1 - high aese v2.16b, v22.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 4 mov d4, v5.d[1] // GHASH block 4k+1 - mid aese v3.16b, v22.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 4 pmull v10.1q, v8.1d, v10.1d // GHASH block 4k - mid aese v0.16b, v23.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 5 pmull v8.1q, v5.1d, v14.1d // GHASH block 4k+1 - low aese v1.16b, v23.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 5 eor v4.8b, v4.8b, v5.8b // GHASH block 4k+1 - mid aese v3.16b, v23.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 5 aese v2.16b, v23.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 5 pmull v5.1q, v6.1d, v13.1d // GHASH block 4k+2 - low aese v0.16b, v24.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 6 eor3 v11.16b, v11.16b, v8.16b, v5.16b // GHASH block 4k+1 - low & GHASH block 4k+2 - low aese v1.16b, v24.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 6 mov d8, v6.d[1] // GHASH block 4k+2 - mid aese v2.16b, v24.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 6 eor v8.8b, v8.8b, v6.8b // GHASH block 4k+2 - mid pmull v4.1q, v4.1d, v17.1d // GHASH block 4k+1 - mid ins v8.d[1], v8.d[0] // GHASH block 4k+2 - mid aese v3.16b, v24.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 6 pmull2 v28.1q, v6.2d, v13.2d // GHASH block 4k+2 - high mov d6, v7.d[1] // GHASH block 4k+3 - mid aese v0.16b, v25.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 7 pmull2 v8.1q, v8.2d, v16.2d // GHASH block 4k+2 - mid aese v1.16b, v25.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 7 pmull v27.1q, v7.1d, v12.1d // GHASH block 4k+3 - low aese v2.16b, v25.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 7 eor3 v10.16b, v10.16b, v4.16b, v8.16b // GHASH block 4k+1 - mid & GHASH block 4k+2 - mid aese v3.16b, v25.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 7 pmull2 v5.1q, v7.2d, v12.2d // GHASH block 4k+3 - high eor v6.8b, v6.8b, v7.8b // GHASH block 4k+3 - mid eor3 v9.16b, v9.16b, v28.16b, v5.16b // GHASH block 4k+2 - high & GHASH block 4k+3 - high aese v0.16b, v26.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 8 aese v1.16b, v26.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 8 aese v2.16b, v26.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 8 pmull v6.1q, v6.1d, v16.1d // GHASH block 4k+3 - mid ldr d8, [sp, #128] aese v3.16b, v26.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 8 pmull v7.1q, v9.1d, v8.1d // MODULO - top 64b align with mid eor3 v10.16b, v10.16b, v6.16b, v7.16b // GHASH block 4k+3 - mid & MODULO - fold into mid eor v11.16b, v11.16b, v27.16b // GHASH block 4k+3 - low eor v6.16b, v11.16b, v9.16b // MODULO - karatsuba tidy up ext v9.16b, v9.16b, v9.16b, #8 // MODULO - other top alignment eor3 v10.16b, v10.16b, v6.16b, v9.16b // MODULO - karatsuba tidy up & MODULO - fold into mid pmull v8.1q, v10.1d, v8.1d // MODULO - mid 64b align with low ext v10.16b, v10.16b, v10.16b, #8 // MODULO - other mid alignment eor3 v11.16b, v11.16b, v8.16b, v10.16b // MODULO - fold into low cmp w17, #12 // setup flags for AES-128/192/256 check b.lt Ldec_main_loop_continue_eor3 // branch if AES-128 ldp q27, q28, [x8, #144] // load rk9, rk10 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 9 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 9 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 9 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 9 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 10 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 10 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 10 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 10 b.eq Ldec_main_loop_continue_eor3 // branch if AES-192 ldp q27, q28, [x8, #176] // load rk11, rk12 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 11 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 11 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 11 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 11 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 4k+4 - round 12 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 4k+5 - round 12 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 4k+6 - round 12 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 4k+7 - round 12 Ldec_main_loop_continue_eor3: ldr q27, [x19] // load rkN ldp q6, q7, [x0, #32] // AES blocks 2,3 load ciphertext ldp q4, q5, [x0], #64 // AES blocks 0,1 load ciphertext aese v0.16b, v31.16b // AES block 4k+4 - round N-1 eor3 v0.16b, v4.16b, v0.16b, v27.16b // AES block 4k+4 - result aese v1.16b, v31.16b // AES block 4k+5 - round N-1 eor3 v1.16b, v5.16b, v1.16b, v27.16b // AES block 4k+5 - result aese v2.16b, v31.16b // AES block 4k+6 - round N-1 eor3 v2.16b, v6.16b, v2.16b, v27.16b // AES block 4k+6 - result aese v3.16b, v31.16b // AES block 4k+7 - round N-1 eor3 v3.16b, v7.16b, v3.16b, v27.16b // AES block 4k+7 - result st1 { v0.16b, v1.16b, v2.16b, v3.16b}, [x2], #64 // AES blocks 4k+4-7 - store result ldr q0, [sp, #160] ldr q1, [sp, #176] ldr q2, [sp, #192] ldr q3, [sp, #208] rev w20, w9 str w20, [sp, #172] add w20, w9, #1 rev w20, w20 str w20, [sp, #188] add w20, w9, #2 rev w20, w20 str w20, [sp, #204] add w20, w9, #3 rev w20, w20 str w20, [sp, #220] add w9, w9, #4 cmp x0, x5 b.lt Ldec_main_loop_eor3 Ldec_prepretail_eor3: // PREPRETAIL rev64 v4.16b, v4.16b // GHASH block 0 rev64 v5.16b, v5.16b // GHASH block 1 ext v11.16b, v11.16b, v11.16b, #8 // PRE 0 aese v0.16b, v18.16b aesmc v0.16b, v0.16b // AES block 0 - round 0 aese v1.16b, v18.16b aesmc v1.16b, v1.16b // AES block 1 - round 0 eor v4.16b, v4.16b, v11.16b // PRE 1 rev64 v6.16b, v6.16b // GHASH block 2 aese v1.16b, v19.16b aesmc v1.16b, v1.16b // AES block 1 - round 1 pmull v11.1q, v4.1d, v15.1d // GHASH block 0 - low mov d8, v4.d[1] // GHASH block 0 - mid pmull2 v9.1q, v4.2d, v15.2d // GHASH block 0 - high aese v2.16b, v18.16b aesmc v2.16b, v2.16b // AES block 2 - round 0 mov d10, v17.d[1] // GHASH block 0 - mid aese v0.16b, v19.16b aesmc v0.16b, v0.16b // AES block 0 - round 1 eor v8.8b, v8.8b, v4.8b // GHASH block 0 - mid pmull2 v4.1q, v5.2d, v14.2d // GHASH block 1 - high aese v2.16b, v19.16b aesmc v2.16b, v2.16b // AES block 2 - round 1 rev64 v7.16b, v7.16b // GHASH block 3 aese v3.16b, v18.16b aesmc v3.16b, v3.16b // AES block 3 - round 0 pmull v10.1q, v8.1d, v10.1d // GHASH block 0 - mid eor v9.16b, v9.16b, v4.16b // GHASH block 1 - high pmull v8.1q, v5.1d, v14.1d // GHASH block 1 - low aese v3.16b, v19.16b aesmc v3.16b, v3.16b // AES block 3 - round 1 mov d4, v5.d[1] // GHASH block 1 - mid aese v0.16b, v20.16b aesmc v0.16b, v0.16b // AES block 0 - round 2 aese v1.16b, v20.16b aesmc v1.16b, v1.16b // AES block 1 - round 2 eor v11.16b, v11.16b, v8.16b // GHASH block 1 - low aese v2.16b, v20.16b aesmc v2.16b, v2.16b // AES block 2 - round 2 aese v0.16b, v21.16b aesmc v0.16b, v0.16b // AES block 0 - round 3 mov d8, v6.d[1] // GHASH block 2 - mid aese v3.16b, v20.16b aesmc v3.16b, v3.16b // AES block 3 - round 2 eor v4.8b, v4.8b, v5.8b // GHASH block 1 - mid pmull v5.1q, v6.1d, v13.1d // GHASH block 2 - low aese v0.16b, v22.16b aesmc v0.16b, v0.16b // AES block 0 - round 4 aese v3.16b, v21.16b aesmc v3.16b, v3.16b // AES block 3 - round 3 eor v8.8b, v8.8b, v6.8b // GHASH block 2 - mid pmull v4.1q, v4.1d, v17.1d // GHASH block 1 - mid aese v0.16b, v23.16b aesmc v0.16b, v0.16b // AES block 0 - round 5 eor v11.16b, v11.16b, v5.16b // GHASH block 2 - low aese v3.16b, v22.16b aesmc v3.16b, v3.16b // AES block 3 - round 4 pmull2 v5.1q, v7.2d, v12.2d // GHASH block 3 - high eor v10.16b, v10.16b, v4.16b // GHASH block 1 - mid pmull2 v4.1q, v6.2d, v13.2d // GHASH block 2 - high aese v3.16b, v23.16b aesmc v3.16b, v3.16b // AES block 3 - round 5 ins v8.d[1], v8.d[0] // GHASH block 2 - mid aese v2.16b, v21.16b aesmc v2.16b, v2.16b // AES block 2 - round 3 aese v1.16b, v21.16b aesmc v1.16b, v1.16b // AES block 1 - round 3 eor3 v9.16b, v9.16b, v4.16b, v5.16b // GHASH block 2 - high & GHASH block 3 - high pmull v4.1q, v7.1d, v12.1d // GHASH block 3 - low aese v2.16b, v22.16b aesmc v2.16b, v2.16b // AES block 2 - round 4 mov d6, v7.d[1] // GHASH block 3 - mid aese v1.16b, v22.16b aesmc v1.16b, v1.16b // AES block 1 - round 4 pmull2 v8.1q, v8.2d, v16.2d // GHASH block 2 - mid aese v2.16b, v23.16b aesmc v2.16b, v2.16b // AES block 2 - round 5 eor v6.8b, v6.8b, v7.8b // GHASH block 3 - mid aese v1.16b, v23.16b aesmc v1.16b, v1.16b // AES block 1 - round 5 aese v3.16b, v24.16b aesmc v3.16b, v3.16b // AES block 3 - round 6 eor v10.16b, v10.16b, v8.16b // GHASH block 2 - mid aese v2.16b, v24.16b aesmc v2.16b, v2.16b // AES block 2 - round 6 aese v0.16b, v24.16b aesmc v0.16b, v0.16b // AES block 0 - round 6 movi v8.8b, #0xc2 aese v1.16b, v24.16b aesmc v1.16b, v1.16b // AES block 1 - round 6 eor v11.16b, v11.16b, v4.16b // GHASH block 3 - low pmull v6.1q, v6.1d, v16.1d // GHASH block 3 - mid aese v3.16b, v25.16b aesmc v3.16b, v3.16b // AES block 3 - round 7 aese v1.16b, v25.16b aesmc v1.16b, v1.16b // AES block 1 - round 7 aese v0.16b, v25.16b aesmc v0.16b, v0.16b // AES block 0 - round 7 eor v10.16b, v10.16b, v6.16b // GHASH block 3 - mid aese v3.16b, v26.16b aesmc v3.16b, v3.16b // AES block 3 - round 8 aese v2.16b, v25.16b aesmc v2.16b, v2.16b // AES block 2 - round 7 eor v6.16b, v11.16b, v9.16b // MODULO - karatsuba tidy up aese v1.16b, v26.16b aesmc v1.16b, v1.16b // AES block 1 - round 8 aese v0.16b, v26.16b aesmc v0.16b, v0.16b // AES block 0 - round 8 shl d8, d8, #56 // mod_constant aese v2.16b, v26.16b aesmc v2.16b, v2.16b // AES block 2 - round 8 cmp w17, #12 // setup flags for AES-128/192/256 check b.lt Ldec_finish_prepretail_eor3 // branch if AES-128 ldp q27, q28, [x8, #144] // load rk9, rk10 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 9 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 9 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 9 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 9 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 10 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 10 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 10 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 10 b.eq Ldec_finish_prepretail_eor3 // branch if AES-192 ldp q27, q28, [x8, #176] // load rk11, rk12 aese v0.16b, v27.16b aesmc v0.16b, v0.16b // AES block 0 - round 11 aese v1.16b, v27.16b aesmc v1.16b, v1.16b // AES block 1 - round 11 aese v2.16b, v27.16b aesmc v2.16b, v2.16b // AES block 2 - round 11 aese v3.16b, v27.16b aesmc v3.16b, v3.16b // AES block 3 - round 11 aese v0.16b, v28.16b aesmc v0.16b, v0.16b // AES block 0 - round 12 aese v1.16b, v28.16b aesmc v1.16b, v1.16b // AES block 1 - round 12 aese v2.16b, v28.16b aesmc v2.16b, v2.16b // AES block 2 - round 12 aese v3.16b, v28.16b aesmc v3.16b, v3.16b // AES block 3 - round 12 Ldec_finish_prepretail_eor3: eor v10.16b, v10.16b, v6.16b // MODULO - karatsuba tidy up pmull v7.1q, v9.1d, v8.1d // MODULO - top 64b align with mid ext v9.16b, v9.16b, v9.16b, #8 // MODULO - other top alignment eor3 v10.16b, v10.16b, v7.16b, v9.16b // MODULO - fold into mid pmull v8.1q, v10.1d, v8.1d // MODULO - mid 64b align with low ext v10.16b, v10.16b, v10.16b, #8 // MODULO - other mid alignment eor3 v11.16b, v11.16b, v8.16b, v10.16b // MODULO - fold into low aese v1.16b, v31.16b // AES block 1 - round N-1 aese v0.16b, v31.16b // AES block 0 - round N-1 aese v3.16b, v31.16b // AES block 3 - round N-1 aese v2.16b, v31.16b // AES block 2 - round N-1 Ldec_tail_eor3: // TAIL sub x5, x4, x0 // main_end_input_ptr is number of bytes left to process ld1 { v5.16b}, [x0], #16 // AES block 0 - load ciphertext eor v0.16b, v5.16b, v0.16b // AES block 0 - result mov x6, v0.d[0] // AES block 0 - mov low mov x7, v0.d[1] // AES block 0 - mov high ext v8.16b, v11.16b, v11.16b, #8 // prepare final partial tag eor x6, x6, x13 // AES block 0 - round N low eor x7, x7, x14 // AES block 0 - round N high cmp x5, #48 b.gt Ldec_blocks_more_than_3_eor3 mov v3.16b, v2.16b movi v10.8b, #0 movi v11.8b, #0 movi v9.8b, #0 mov v2.16b, v1.16b cmp x5, #32 b.gt Ldec_blocks_more_than_2_eor3 mov v3.16b, v1.16b cmp x5, #16 b.gt Ldec_blocks_more_than_1_eor3 b Ldec_blocks_less_than_1_eor3 Ldec_blocks_more_than_3_eor3: // blocks left > 3 rev64 v4.16b, v5.16b // GHASH final-3 block ld1 { v5.16b}, [x0], #16 // AES final-2 block - load ciphertext stp x6, x7, [x2], #16 // AES final-3 block - store result mov d10, v17.d[1] // GHASH final-3 block - mid eor v4.16b, v4.16b, v8.16b // feed in partial tag eor v0.16b, v5.16b, v1.16b // AES final-2 block - result mov d22, v4.d[1] // GHASH final-3 block - mid mov x6, v0.d[0] // AES final-2 block - mov low mov x7, v0.d[1] // AES final-2 block - mov high eor v22.8b, v22.8b, v4.8b // GHASH final-3 block - mid movi v8.8b, #0 // suppress further partial tag feed in pmull2 v9.1q, v4.2d, v15.2d // GHASH final-3 block - high pmull v10.1q, v22.1d, v10.1d // GHASH final-3 block - mid eor x6, x6, x13 // AES final-2 block - round N low pmull v11.1q, v4.1d, v15.1d // GHASH final-3 block - low eor x7, x7, x14 // AES final-2 block - round N high Ldec_blocks_more_than_2_eor3: // blocks left > 2 rev64 v4.16b, v5.16b // GHASH final-2 block ld1 { v5.16b}, [x0], #16 // AES final-1 block - load ciphertext eor v4.16b, v4.16b, v8.16b // feed in partial tag stp x6, x7, [x2], #16 // AES final-2 block - store result eor v0.16b, v5.16b, v2.16b // AES final-1 block - result mov d22, v4.d[1] // GHASH final-2 block - mid pmull v21.1q, v4.1d, v14.1d // GHASH final-2 block - low pmull2 v20.1q, v4.2d, v14.2d // GHASH final-2 block - high eor v22.8b, v22.8b, v4.8b // GHASH final-2 block - mid mov x6, v0.d[0] // AES final-1 block - mov low mov x7, v0.d[1] // AES final-1 block - mov high eor v11.16b, v11.16b, v21.16b // GHASH final-2 block - low movi v8.8b, #0 // suppress further partial tag feed in pmull v22.1q, v22.1d, v17.1d // GHASH final-2 block - mid eor v9.16b, v9.16b, v20.16b // GHASH final-2 block - high eor x6, x6, x13 // AES final-1 block - round N low eor v10.16b, v10.16b, v22.16b // GHASH final-2 block - mid eor x7, x7, x14 // AES final-1 block - round N high Ldec_blocks_more_than_1_eor3: // blocks left > 1 stp x6, x7, [x2], #16 // AES final-1 block - store result rev64 v4.16b, v5.16b // GHASH final-1 block ld1 { v5.16b}, [x0], #16 // AES final block - load ciphertext eor v4.16b, v4.16b, v8.16b // feed in partial tag movi v8.8b, #0 // suppress further partial tag feed in mov d22, v4.d[1] // GHASH final-1 block - mid eor v0.16b, v5.16b, v3.16b // AES final block - result pmull2 v20.1q, v4.2d, v13.2d // GHASH final-1 block - high eor v22.8b, v22.8b, v4.8b // GHASH final-1 block - mid pmull v21.1q, v4.1d, v13.1d // GHASH final-1 block - low mov x6, v0.d[0] // AES final block - mov low ins v22.d[1], v22.d[0] // GHASH final-1 block - mid mov x7, v0.d[1] // AES final block - mov high pmull2 v22.1q, v22.2d, v16.2d // GHASH final-1 block - mid eor x6, x6, x13 // AES final block - round N low eor v11.16b, v11.16b, v21.16b // GHASH final-1 block - low eor v9.16b, v9.16b, v20.16b // GHASH final-1 block - high eor v10.16b, v10.16b, v22.16b // GHASH final-1 block - mid eor x7, x7, x14 // AES final block - round N high Ldec_blocks_less_than_1_eor3: // blocks left <= 1 add x10, x10, x1, lsr #7 // Calculate the updated counter based on the number of 16B chunks we processed rev w10, w10 str w10, [x16, #12] // store the updated counter and x1, x1, #127 // bit_length %= 128 mvn x14, xzr // rkN_h = 0xffffffffffffffff sub x1, x1, #128 // bit_length -= 128 mvn x13, xzr // rkN_l = 0xffffffffffffffff ldp x4, x5, [x2] // load existing bytes we need to not overwrite neg x1, x1 // bit_length = 128 - #bits in input (in range [1,128]) and x1, x1, #127 // bit_length %= 128 lsr x14, x14, x1 // rkN_h is mask for top 64b of last block cmp x1, #64 csel x9, x13, x14, lt csel x10, x14, xzr, lt fmov d0, x9 // ctr0b is mask for last block and x6, x6, x9 mov v0.d[1], x10 bic x4, x4, x9 // mask out low existing bytes bic x5, x5, x10 // mask out high existing bytes orr x6, x6, x4 and x7, x7, x10 orr x7, x7, x5 and v5.16b, v5.16b, v0.16b // possibly partial last block has zeroes in highest bits rev64 v4.16b, v5.16b // GHASH final block eor v4.16b, v4.16b, v8.16b // feed in partial tag pmull v21.1q, v4.1d, v12.1d // GHASH final block - low mov d8, v4.d[1] // GHASH final block - mid eor v8.8b, v8.8b, v4.8b // GHASH final block - mid pmull2 v20.1q, v4.2d, v12.2d // GHASH final block - high pmull v8.1q, v8.1d, v16.1d // GHASH final block - mid eor v9.16b, v9.16b, v20.16b // GHASH final block - high eor v11.16b, v11.16b, v21.16b // GHASH final block - low eor v10.16b, v10.16b, v8.16b // GHASH final block - mid ldr d8, [sp, #128] eor v6.16b, v11.16b, v9.16b // MODULO - karatsuba tidy up eor v10.16b, v10.16b, v6.16b // MODULO - karatsuba tidy up pmull v7.1q, v9.1d, v8.1d // MODULO - top 64b align with mid ext v9.16b, v9.16b, v9.16b, #8 // MODULO - other top alignment eor v10.16b, v10.16b, v7.16b // MODULO - fold into mid eor v10.16b, v10.16b, v9.16b // MODULO - fold into mid pmull v8.1q, v10.1d, v8.1d // MODULO - mid 64b align with low ext v10.16b, v10.16b, v10.16b, #8 // MODULO - other mid alignment eor v11.16b, v11.16b, v8.16b // MODULO - fold into low stp x6, x7, [x2] eor v11.16b, v11.16b, v10.16b // MODULO - fold into low ext v11.16b, v11.16b, v11.16b, #8 rev64 v11.16b, v11.16b // Final Tag mov x0, x15 st1 { v11.16b }, [x3] // Store final tag ldp x19, x20, [sp, #16] ldp x21, x22, [sp, #32] ldp x23, x24, [sp, #48] ldp d8, d9, [sp, #64] ldp d10, d11, [sp, #80] ldp d12, d13, [sp, #96] ldp d14, d15, [sp, #112] ldp x29, x30, [sp], #224 AARCH64_VALIDATE_LINK_REGISTER ret #endif // __ARM_MAX_ARCH__ >= 8 #endif // !OPENSSL_NO_ASM && defined(OPENSSL_AARCH64) && defined(__APPLE__)