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diff --git a/src/asm/aes256.asm b/src/asm/aes256.asm
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-; Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
-; This file is part of the "AES tools" project.
-; For details, see https://github.com/egor-tensin/aes-tools.
-; Distributed under the MIT License.
-
-.586
-.xmm
-.model flat
-
-.code
-
-@aes_AES256_encrypt_block_@20 proc
- pxor xmm0, [ecx]
- aesenc xmm0, [ecx + 10h]
- aesenc xmm0, [ecx + 20h]
- aesenc xmm0, [ecx + 30h]
- aesenc xmm0, [ecx + 40h]
- aesenc xmm0, [ecx + 50h]
- aesenc xmm0, [ecx + 60h]
- aesenc xmm0, [ecx + 70h]
- aesenc xmm0, [ecx + 80h]
- aesenc xmm0, [ecx + 90h]
- aesenc xmm0, [ecx + 0A0h]
- aesenc xmm0, [ecx + 0B0h]
- aesenc xmm0, [ecx + 0C0h]
- aesenc xmm0, [ecx + 0D0h]
- aesenclast xmm0, [ecx + 0E0h]
- ret
-@aes_AES256_encrypt_block_@20 endp
-
-@aes_AES256_decrypt_block_@20 proc
- pxor xmm0, [ecx]
- aesdec xmm0, [ecx + 10h]
- aesdec xmm0, [ecx + 20h]
- aesdec xmm0, [ecx + 30h]
- aesdec xmm0, [ecx + 40h]
- aesdec xmm0, [ecx + 50h]
- aesdec xmm0, [ecx + 60h]
- aesdec xmm0, [ecx + 70h]
- aesdec xmm0, [ecx + 80h]
- aesdec xmm0, [ecx + 90h]
- aesdec xmm0, [ecx + 0A0h]
- aesdec xmm0, [ecx + 0B0h]
- aesdec xmm0, [ecx + 0C0h]
- aesdec xmm0, [ecx + 0D0h]
- aesdeclast xmm0, [ecx + 0E0h]
- ret
-@aes_AES256_decrypt_block_@20 endp
-
-@aes_AES256_expand_key_@36 proc
- ; A "word" (in terms of the FIPS 187 standard) is a 32-bit block.
- ; Words are denoted by `w[N]`.
- ;
- ; A key schedule is composed of 14 "regular" keys and a dumb key for
- ; the "whitening" step.
- ;
- ; A key schedule is thus composed of 60 "words".
- ; The FIPS standard includes an algorithm to calculate these words via
- ; a simple loop:
- ;
- ; i = 8
- ; while i < 60:
- ; temp = w[i - 1]
- ; if i % 8 == 0:
- ; temp = SubWord(RotWord(temp))^Rcon
- ; elif i % 8 == 4:
- ; temp = SubWord(temp)
- ; w[i] = w[i - 8]^temp
- ; i = i + 1
- ;
- ; The loop above may be unrolled like this:
- ;
- ; w[8] = SubWord(RotWord(w[7]))^Rcon^w[0]
- ; w[9] = w[8]^w[1]
- ; = SubWord(RotWord(w[7]))^Rcon^w[1]^w[0]
- ; w[10] = w[9]^w[2]
- ; = SubWord(RotWord(w[7]))^Rcon^w[2]^w[1]^w[0]
- ; w[11] = w[10]^w[3]
- ; = SubWord(RotWord(w[7]))^Rcon^w[3]^w[2]^w[1]^w[0]
- ; w[12] = SubWord(w[11])^w[4]
- ; w[13] = w[12]^w[5]
- ; = SubWord(w[11])^w[5]^w[4]
- ; w[14] = w[13]^w[6]
- ; = SubWord(w[11])^w[6]^w[5]^w[4]
- ; w[15] = w[14]^w[7]
- ; = SubWord(w[11])^w[7]^w[6]^w[5]^w[4]
- ; w[16] = SubWord(RotWord(w[15]))^Rcon^w[8]
- ; w[17] = w[16]^w[9]
- ; = SubWord(RotWord(w[15]))^Rcon^w[9]^w[8]
- ; w[18] = w[17]^w[10]
- ; = SubWord(RotWord(w[15]))^Rcon^w[10]^w[9]^w[8]
- ; w[19] = w[18]^w[11]
- ; = SubWord(RotWord(w[15]))^Rcon^w[11]^w[10]^w[9]^w[8]
- ; w[20] = SubWord(w[19])^w[12]
- ; w[21] = w[20]^w[13]
- ; = SubWord(w[19])^w[13]^w[12]
- ; w[22] = w[21]^w[14]
- ; = SubWord(w[19])^w[14]^w[13]^w[12]
- ; w[23] = w[22]^w[15]
- ; = SubWord(w[19])^w[15]^w[14]^w[13]^w[12]
- ;
- ; ... and so on.
- ;
- ; The Intel AES-NI instruction set facilitates calculating SubWord
- ; and RotWord using `aeskeygenassist`, which is used in this routine.
- ;
- ; Preconditions:
- ; * xmm1[127:96] == w[7],
- ; * xmm1[95:64] == w[6],
- ; * xmm1[63:32] == w[5],
- ; * xmm1[31:0] == w[4],
- ; * xmm0[127:96] == w[3],
- ; * xmm0[95:64] == w[2],
- ; * xmm0[63:32] == w[1],
- ; * xmm0[31:0] == w[0].
-
- movdqa [ecx], xmm0 ; sets w[0], w[1], w[2], w[3]
- movdqa [ecx + 10h], xmm1 ; sets w[4], w[5], w[6], w[7]
- lea ecx, [ecx + 20h] ; ecx = &w[8]
-
- aeskeygenassist xmm5, xmm1, 1h ; xmm5[127:96] = RotWord(SubWord(w[7]))^Rcon
- pshufd xmm5, xmm5, 0FFh ; xmm5[95:64] = xmm5[63:32] = xmm5[31:0] = xmm5[127:96]
- call aes256_keygen_assist ; sets w[8], w[9], w[10], w[11]
-
- aeskeygenassist xmm5, xmm1, 0 ; xmm5[95:64] = SubWord(w[11])
- pshufd xmm5, xmm5, 0AAh ; xmm5[127:96] = xmm5[63:32] = xmm5[31:0] = xmm5[95:64]
- call aes256_keygen_assist ; sets w[12], w[13], w[14], w[15]
-
- aeskeygenassist xmm5, xmm1, 2h ; xmm5[127:96] = RotWord(SubWord(w[15]))^Rcon
- pshufd xmm5, xmm5, 0FFh ; xmm5[95:64] = xmm5[63:32] = xmm5[31:0] = xmm5[127:96]
- call aes256_keygen_assist ; sets w[16], w[17], w[18], w[19]
-
- aeskeygenassist xmm5, xmm1, 0 ; xmm5[95:64] = SubWord(w[19])
- pshufd xmm5, xmm5, 0AAh ; xmm5[127:96] = xmm5[63:32] = xmm5[31:0] = xmm5[95:64]
- call aes256_keygen_assist ; sets w[20], w[21], w[22], w[23]
-
- aeskeygenassist xmm5, xmm1, 4h ; xmm5[127:96] = RotWord(SubWord(w[23]))^Rcon
- pshufd xmm5, xmm5, 0FFh ; xmm5[95:64] = xmm5[63:32] = xmm5[31:0] = xmm5[127:96]
- call aes256_keygen_assist ; sets w[24], w[25], w[26], w[27]
-
- aeskeygenassist xmm5, xmm1, 0 ; xmm5[95:64] = SubWord(w[27])
- pshufd xmm5, xmm5, 0AAh ; xmm5[127:96] = xmm5[63:32] = xmm5[31:0] = xmm5[95:64]
- call aes256_keygen_assist ; sets w[28], w[29], w[30], w[31]
-
- aeskeygenassist xmm5, xmm1, 8h ; xmm5[127:96] = RotWord(SubWord(w[31]))^Rcon
- pshufd xmm5, xmm5, 0FFh ; xmm5[95:64] = xmm5[63:32] = xmm5[31:0] = xmm5[127:96]
- call aes256_keygen_assist ; sets w[32], w[33], w[34], w[35]
-
- aeskeygenassist xmm5, xmm1, 0 ; xmm5[95:64] = SubWord(w[35])
- pshufd xmm5, xmm5, 0AAh ; xmm5[127:96] = xmm5[63:32] = xmm5[31:0] = xmm5[95:64]
- call aes256_keygen_assist ; sets w[36], w[37], w[38], w[39]
-
- aeskeygenassist xmm5, xmm1, 10h ; xmm5[127:96] = RotWord(SubWord(w[39]))^Rcon
- pshufd xmm5, xmm5, 0FFh ; xmm5[95:64] = xmm5[63:32] = xmm5[31:0] = xmm5[127:96]
- call aes256_keygen_assist ; sets w[40], w[41], w[42], w[43]
-
- aeskeygenassist xmm5, xmm1, 0 ; xmm5[95:64] = SubWord(w[43])
- pshufd xmm5, xmm5, 0AAh ; xmm5[127:96] = xmm5[63:32] = xmm5[31:0] = xmm5[95:64]
- call aes256_keygen_assist ; sets w[44], w[45], w[46], w[47]
-
- aeskeygenassist xmm5, xmm1, 20h ; xmm5[127:96] = RotWord(SubWord(w[47]))^Rcon
- pshufd xmm5, xmm5, 0FFh ; xmm5[95:64] = xmm5[63:32] = xmm5[31:0] = xmm5[127:96]
- call aes256_keygen_assist ; sets w[48], w[49], w[50], w[51]
-
- aeskeygenassist xmm5, xmm1, 0 ; xmm5[95:64] = SubWord(w[51])
- pshufd xmm5, xmm5, 0AAh ; xmm5[127:96] = xmm5[63:32] = xmm5[31:0] = xmm5[95:64]
- call aes256_keygen_assist ; sets w[52], w[53], w[54], w[55]
-
- aeskeygenassist xmm5, xmm1, 40h ; xmm5[127:96] = RotWord(SubWord(w[55]))^Rcon
- pshufd xmm5, xmm5, 0FFh ; xmm5[95:64] = xmm5[63:32] = xmm5[31:0] = xmm5[127:96]
- call aes256_keygen_assist ; sets w[56], w[57], w[58], w[59]
-
- ret
-
-aes256_keygen_assist:
- ; Preconditions:
- ; * xmm1[127:96] == w[i+7],
- ; * xmm1[95:64] == w[i+6],
- ; * xmm1[63:32] == w[i+5],
- ; * xmm1[31:0] == w[i+4],
- ; * xmm0[127:96] == w[i+3],
- ; * xmm0[95:64] == w[i+2],
- ; * xmm0[63:32] == w[i+1],
- ; * xmm0[31:0] == w[i],
- ; * xmm5[127:96] == xmm5[95:64] == xmm5[63:32] == xmm5[31:0] == HWGEN,
- ; where HWGEN is either RotWord(SubWord(w[i+7]))^Rcon or SubWord(w[i+7]),
- ; depending on the number of the round being processed,
- ; * ecx == &w[i+8].
- ;
- ; Postconditions:
- ; * xmm1[127:96] == w[i+11] == HWGEN^w[i+3]^w[i+2]^w[i+1]^w[i],
- ; * xmm1[95:64] == w[i+10] == HWGEN^w[i+2]^w[i+1]^w[i],
- ; * xmm1[63:32] == w[i+9] == HWGEN^w[i+1]^w[i],
- ; * xmm1[31:0] == w[i+8] == HWGEN^w[i],
- ; * xmm0[127:96] == w[i+7],
- ; * xmm0[95:64] == w[i+6],
- ; * xmm0[63:32] == w[i+5],
- ; * xmm0[31:0] == w[i+4],
- ; * ecx == &w[i+12],
- ; * the value in xmm4 is also modified.
-
- ; Calculate
- ; w[i+3]^w[i+2]^w[i+1]^w[i],
- ; w[i+2]^w[i+1]^w[i],
- ; w[i+1]^w[i] and
- ; w[i].
- movdqa xmm4, xmm0 ; xmm4 = xmm0
- pslldq xmm4, 4 ; xmm4 <<= 32
- pxor xmm0, xmm4 ; xmm0 ^= xmm4
- pslldq xmm4, 4 ; xmm4 <<= 32
- pxor xmm0, xmm4 ; xmm0 ^= xmm4
- pslldq xmm4, 4 ; xmm4 <<= 32
- pxor xmm0, xmm4 ; xmm0 ^= xmm4
- ; xmm0[127:96] == w[i+3]^w[i+2]^w[i+1]^w[i]
- ; xmm0[95:64] == w[i+2]^w[i+1]^w[i]
- ; xmm0[63:32] == w[i+1]^w[i]
- ; xmm0[31:0] == w[i]
-
- ; Calculate
- ; HWGEN^w[i+3]^w[i+2]^w[i+1]^w[i],
- ; HWGEN^w[i+2]^w[i+1]^w[i],
- ; HWGEN^w[i+1]^w[i] and
- ; HWGEN^w[i].
- pxor xmm0, xmm5 ; xmm0 ^= xmm5
- ; xmm0[127:96] == w[i+11] == HWGEN^w[i+3]^w[i+2]^w[i+1]^w[i]
- ; xmm0[95:64] == w[i+10] == HWGEN^w[i+2]^w[i+1]^w[i]
- ; xmm0[63:32] == w[i+9] == HWGEN^w[i+1]^w[i]
- ; xmm0[31:0] == w[i+8] == HWGEN^w[i]
-
- ; Set w[i+8], w[i+9], w[i+10] and w[i+11].
- movdqa [ecx], xmm0 ; w[i+8] = HWGEN^w[i]
- ; w[i+9] = HWGEN^w[i+1]^w[i]
- ; w[i+10] = HWGEN^w[i+2]^w[i+1]^w[i]
- ; w[i+11] = HWGEN^w[i+3]^w[i+2]^w[i+1]^w[i]
- add ecx, 10h ; ecx = &w[i+12]
-
- ; Swap the values in xmm0 and xmm1.
- pxor xmm0, xmm1
- pxor xmm1, xmm0
- pxor xmm0, xmm1
-
- ret
-@aes_AES256_expand_key_@36 endp
-
-@aes_AES256_derive_decryption_keys_@8 proc
- movdqa xmm5, [ecx]
- movdqa xmm4, [ecx + 0E0h]
- movdqa [edx], xmm4
- movdqa [edx + 0E0h], xmm5
-
- aesimc xmm5, [ecx + 10h]
- aesimc xmm4, [ecx + 0D0h]
- movdqa [edx + 10h], xmm4
- movdqa [edx + 0D0h], xmm5
-
- aesimc xmm5, [ecx + 20h]
- aesimc xmm4, [ecx + 0C0h]
- movdqa [edx + 20h], xmm4
- movdqa [edx + 0C0h], xmm5
-
- aesimc xmm5, [ecx + 30h]
- aesimc xmm4, [ecx + 0B0h]
- movdqa [edx + 30h], xmm4
- movdqa [edx + 0B0h], xmm5
-
- aesimc xmm5, [ecx + 40h]
- aesimc xmm4, [ecx + 0A0h]
- movdqa [edx + 40h], xmm4
- movdqa [edx + 0A0h], xmm5
-
- aesimc xmm5, [ecx + 50h]
- aesimc xmm4, [ecx + 90h]
- movdqa [edx + 50h], xmm4
- movdqa [edx + 90h], xmm5
-
- aesimc xmm5, [ecx + 60h]
- aesimc xmm4, [ecx + 80h]
- movdqa [edx + 60h], xmm4
- movdqa [edx + 80h], xmm5
-
- aesimc xmm5, [ecx + 70h]
- movdqa [edx + 70h], xmm5
-
- ret
-@aes_AES256_derive_decryption_keys_@8 endp
-
-end
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