; Copyright 2015 Egor Tensin ; This file is licensed under the terms of the MIT License. ; See LICENSE.txt for details. .586 .xmm .model flat .code @aesni_aes192_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] aesenclast xmm0, [ecx + 0C0h] ret @aesni_aes192_encrypt_block_@20 endp @aesni_aes192_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] aesdeclast xmm0, [ecx + 0C0h] ret @aesni_aes192_decrypt_block_@20 endp @aesni_aes192_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 12 "regular" keys and a dumb key for ; the "whitening" step. ; ; A key schedule is thus composed of 52 "words". ; The FIPS standard includes an algorithm to calculate these words via ; a simple loop: ; ; i = 6 ; while i < 52: ; temp = w[i - 1] ; if i % 6 == 0: ; temp = SubWord(RotWord(temp))^Rcon ; w[i] = w[i - 6]^temp ; i = i + 1 ; ; The loop above may be unrolled like this: ; ; w[6] = SubWord(RotWord(w[5]))^Rcon^w[0] ; w[7] = w[6]^w[1] ; = SubWord(RotWord(w[5]))^Rcon^w[0]^w[1] ; w[8] = w[7]^w[2] ; = SubWord(RotWord(w[5]))^Rcon^w[0]^w[1]^w[2] ; w[9] = w[8]^w[3] ; = SubWord(RotWord(w[5]))^Rcon^w[0]^w[1]^w[2]^w[3] ; w[10] = w[9]^w[4] ; = SubWord(RotWord(w[5]))^Rcon^w[0]^w[1]^w[2]^w[3]^w[4] ; w[11] = w[10]^w[5] ; = SubWord(RotWord(w[5]))^Rcon^w[0]^w[1]^w[2]^w[3]^w[4]^w[5] ; w[12] = SubWord(RotWord(w[11]))^Rcon^w[6] ; w[13] = w[12]^w[7] ; = SubWord(RotWord(w[11]))^Rcon^w[6]^w[7] ; w[14] = w[13]^w[8] ; = SubWord(RotWord(w[11]))^Rcon^w[6]^w[7]^w[8] ; w[15] = w[14]^w[9] ; = SubWord(RotWord(w[11]))^Rcon^w[6]^w[7]^w[8]^w[9] ; w[16] = w[15]^w[10] ; = SubWord(RotWord(w[11]))^Rcon^w[6]^w[7]^w[8]^w[9]^w[10] ; w[17] = w[16]^w[11] ; = SubWort(RotWord(w[11]))^Rcon^w[6]^w[7]^w[8]^w[9]^w[10]^w[11] ; ; ... and so on. ; ; The Intel AES-NI instruction set facilitates calculating SubWord ; and RotWord using `aeskeygenassist`, which is used in this routine. ; ; Preconditions: ; * 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] movq qword ptr [ecx + 10h], xmm1 ; sets w[4], w[5] aeskeygenassist xmm5, xmm1, 1 ; xmm5[63:32] = RotWord(SubWord(w[5]))^Rcon, call aes192_keygen_assist movdqu [ecx + 18h], xmm0 movq qword ptr [ecx + 28h], xmm1 aeskeygenassist xmm5, xmm1, 2 ; xmm5[63:32] = RotWord(SubWord(w[11]))^Rcon call aes192_keygen_assist movdqa [ecx + 30h], xmm0 movq qword ptr [ecx + 40h], xmm1 aeskeygenassist xmm5, xmm1, 4 ; xmm5[63:32] = RotWord(SubWord(w[17]))^Rcon call aes192_keygen_assist movdqu [ecx + 48h], xmm0 movq qword ptr [ecx + 58h], xmm1 aeskeygenassist xmm5, xmm1, 8 ; xmm5[63:32] = RotWord(SubWord(w[23]))^Rcon call aes192_keygen_assist movdqa [ecx + 60h], xmm0 movq qword ptr [ecx + 70h], xmm1 aeskeygenassist xmm5, xmm1, 10h ; xmm5[63:32] = RotWord(SubWord(w[29]))^Rcon call aes192_keygen_assist movdqu [ecx + 78h], xmm0 movq qword ptr [ecx + 88h], xmm1 aeskeygenassist xmm5, xmm1, 20h ; xmm5[63:32] = RotWord(SubWord(w[35]))^Rcon call aes192_keygen_assist movdqa [ecx + 90h], xmm0 movq qword ptr [ecx + 0a0h], xmm1 aeskeygenassist xmm5, xmm1, 40h ; xmm5[63:32] = RotWord(SubWord(w[41]))^Rcon call aes192_keygen_assist movdqu [ecx + 0a8h], xmm0 movq qword ptr [ecx + 0b8h], xmm1 aeskeygenassist xmm5, xmm1, 80h ; xmm5[63:32] = RotWord(SubWord(w[49]))^Rcon call aes192_keygen_assist movdqa [ecx + 0c0h], xmm0 ret aes192_keygen_assist: ; Preconditions: ; * xmm1[127:96] == 0, ; * xmm1[95:64] == 0, ; * 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[63:32] == RotWord(SubWord(w[i+5]))^Rcon. ; ; Postconditions: ; * xmm1[127:96] == 0, ; * xmm1[95:64] == 0, ; * xmm1[63:32] == w[i+11] == RotWord(SubWord(w[i+5]))^Rcon^w[i+5]^w[i+4]^w[i+3]^w[i+2]^w[i+1]^w[i], ; * xmm1[31:0] == w[i+10] == RotWord(SubWord(w[i+5]))^Rcon^w[i+4]^w[i+3]^w[i+2]^w[i+1]^w[i], ; * xmm0[127:96] == w[i+9] == RotWord(SubWord(w[i+5]))^Rcon^w[i+3]^w[i+2]^w[i+1]^w[i], ; * xmm0[95:64] == w[i+8] == RotWord(SubWord(w[i+5]))^Rcon^w[i+2]^w[i+1]^w[i], ; * xmm0[63:32] == w[i+7] == RotWord(SubWord(w[i+5]))^Rcon^w[i+1]^w[i], ; * xmm0[31:0] == w[i+6] == RotWord(SubWord(w[i+5]))^Rcon^w[i], ; * 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 ; w[i+9] == RotWord(SubWord(w[i+5]))^Rcon^w[i+3]^w[i+2]^w[i+1]^w[i], ; w[i+8] == RotWord(SubWord(w[i+5]))^Rcon^w[i+2]^w[i+1]^w[i], ; w[i+7] == RotWord(SubWord(w[i+5]))^Rcon^w[i+1]^w[i] and ; w[i+6] == RotWord(SubWord(w[i+5]))^Rcon^w[i]. pshufd xmm4, xmm5, 55h ; xmm4[127:96] = xmm4[95:64] = xmm4[63:32] = xmm4[31:0] = xmm5[63:32] pxor xmm0, xmm4 ; xmm0 ^= xmm4 ; xmm0[127:96] == w[i+9] == RotWord(SubWord(w[i+5]))^Rcon^w[i+3]^w[i+2]^w[i+1]^w[i] ; xmm0[95:64] == w[i+8] == RotWord(SubWord(w[i+5]))^Rcon^w[i+2]^w[i+1]^w[i] ; xmm0[63:32] == w[i+7] == RotWord(SubWord(w[i+5]))^Rcon^w[i+1]^w[i] ; xmm0[31:0] == w[i+6] == RotWord(SubWord(w[i+5]))^Rcon^w[i] ; Calculate ; w[i+5]^w[i+4], ; w[i+4]. pshufd xmm4, xmm1, 0F3h ; xmm4 = xmm1[31:0] << 32 pxor xmm1, xmm4 ; xmm1 ^= xmm5 ; xmm1[63:32] == w[i+5]^w[i+4] ; xmm1[31:0] == w[i+4] ; Calculate ; w[i+10] == RotWord(SubWord(w[i+5]))^Rcon^w[i+5]^w[i+4]^w[i+3]^w[i+2]^w[i+1]^w[i], ; w[i+11] == RotWord(SubWord(w[i+5]))^Rcon^w[i+4]^w[i+3]^w[i+2]^w[i+1]^w[i]. pshufd xmm4, xmm0, 0FFh ; xmm4[127:96] = xmm4[95:64] = xmm4[63:32] = xmm4[31:0] = xmm0[127:96] psrldq xmm4, 8 ; xmm4 >>= 64 pxor xmm1, xmm4 ; xmm1 ^= xmm4 ; xmm1[63:32] == w[i+11] == RotWord(SubWord(w[i+5]))^Rcon^w[i+5]^w[i+4]^w[i+3]^w[i+2]^w[i+1]^w[i] ; xmm1[31:0] == w[i+10] == RotWord(SubWord(w[i+5]))^Rcon^w[i+4]^w[i+3]^w[i+2]^w[i+1]^w[i] ret @aesni_aes192_expand_key_@36 endp @aesni_aes192_derive_decryption_keys_@8 proc movdqa xmm5, [ecx] movdqa xmm4, [ecx + 0C0h] movdqa [edx], xmm4 movdqa [edx + 0C0h], xmm5 aesimc xmm5, [ecx + 10h] aesimc xmm4, [ecx + 0B0h] movdqa [edx + 10h], xmm4 movdqa [edx + 0B0h], xmm5 aesimc xmm5, [ecx + 20h] aesimc xmm4, [ecx + 0A0h] movdqa [edx + 20h], xmm4 movdqa [edx + 0A0h], xmm5 aesimc xmm5, [ecx + 30h] aesimc xmm4, [ecx + 90h] movdqa [edx + 30h], xmm4 movdqa [edx + 90h], xmm5 aesimc xmm5, [ecx + 40h] aesimc xmm4, [ecx + 80h] movdqa [edx + 40h], xmm4 movdqa [edx + 80h], xmm5 aesimc xmm5, [ecx + 50h] aesimc xmm4, [ecx + 70h] movdqa [edx + 50h], xmm4 movdqa [edx + 70h], xmm5 aesimc xmm5, [ecx + 60h] movdqa [edx + 60h], xmm5 ret @aesni_aes192_derive_decryption_keys_@8 endp end