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; Copyright 2015 Egor Tensin <Egor.Tensin@gmail.com>
; This file is licensed under the terms of the MIT License.
; See LICENSE.txt for details.
.586
.xmm
.model flat
.data
align 10h
key_schedule oword 11 dup(0)
align 10h
inverted_key_schedule oword 11 dup(0)
.code
@aes128ecb_encrypt@32 proc
call expand_keys_128ecb
pxor xmm0, [key_schedule]
aesenc xmm0, [key_schedule + 10h]
aesenc xmm0, [key_schedule + 20h]
aesenc xmm0, [key_schedule + 30h]
aesenc xmm0, [key_schedule + 40h]
aesenc xmm0, [key_schedule + 50h]
aesenc xmm0, [key_schedule + 60h]
aesenc xmm0, [key_schedule + 70h]
aesenc xmm0, [key_schedule + 80h]
aesenc xmm0, [key_schedule + 90h]
aesenclast xmm0, [key_schedule + 0A0h]
ret
@aes128ecb_encrypt@32 endp
@aes128ecb_decrypt@32 proc
call expand_keys_128ecb
pxor xmm0, [inverted_key_schedule]
aesdec xmm0, [inverted_key_schedule + 10h]
aesdec xmm0, [inverted_key_schedule + 20h]
aesdec xmm0, [inverted_key_schedule + 30h]
aesdec xmm0, [inverted_key_schedule + 40h]
aesdec xmm0, [inverted_key_schedule + 50h]
aesdec xmm0, [inverted_key_schedule + 60h]
aesdec xmm0, [inverted_key_schedule + 70h]
aesdec xmm0, [inverted_key_schedule + 80h]
aesdec xmm0, [inverted_key_schedule + 90h]
aesdeclast xmm0, [inverted_key_schedule + 0A0h]
ret
@aes128ecb_decrypt@32 endp
expand_keys_128ecb proc
lea ecx, [key_schedule + 10h]
movdqa [key_schedule], xmm1
aeskeygenassist xmm7, xmm1, 01h
call gen_round_key
aeskeygenassist xmm7, xmm1, 02h
call gen_round_key
aeskeygenassist xmm7, xmm1, 04h
call gen_round_key
aeskeygenassist xmm7, xmm1, 08h
call gen_round_key
aeskeygenassist xmm7, xmm1, 10h
call gen_round_key
aeskeygenassist xmm7, xmm1, 20h
call gen_round_key
aeskeygenassist xmm7, xmm1, 40h
call gen_round_key
aeskeygenassist xmm7, xmm1, 80h
call gen_round_key
aeskeygenassist xmm7, xmm1, 1Bh
call gen_round_key
aeskeygenassist xmm7, xmm1, 36h
call gen_round_key
call invert_key_schedule
ret
gen_round_key:
movdqa xmm6, xmm1 ; xmm6 = key_schedule[i]
; xmm6 = x3 x2 x1 x0
pslldq xmm6, 4 ; xmm6 = x2 x1 x0 0
pxor xmm1, xmm6 ; xmm1 = (x3 x2) (x2 x1) (x1 x0) x0
pslldq xmm6, 4 ; xmm6 = x1 x0 0 0
pxor xmm1, xmm6 ; xmm1 = (x3 x2 x1) (x2 x1 x0) (x1 x0) x0
pslldq xmm6, 4 ; xmm6 = x0 0 0 0
pxor xmm1, xmm6 ; xmm1 = (x3 x2 x1 x0) (x2 x1 x0) (x1 x0) x0
pshufd xmm7, xmm7, 0FFh
pxor xmm1, xmm7
movdqa [ecx], xmm1
add ecx, 10h
ret
invert_key_schedule:
movdqa xmm7, [key_schedule]
movdqa xmm6, [key_schedule + 0A0h]
movdqa [inverted_key_schedule], xmm6
movdqa [inverted_key_schedule + 0A0h], xmm7
aesimc xmm7, [key_schedule + 10h]
aesimc xmm6, [key_schedule + 90h]
movdqa [inverted_key_schedule + 10h], xmm6
movdqa [inverted_key_schedule + 90h], xmm7
aesimc xmm7, [key_schedule + 20h]
aesimc xmm6, [key_schedule + 80h]
movdqa [inverted_key_schedule + 20h], xmm6
movdqa [inverted_key_schedule + 80h], xmm7
aesimc xmm7, [key_schedule + 30h]
aesimc xmm6, [key_schedule + 70h]
movdqa [inverted_key_schedule + 30h], xmm6
movdqa [inverted_key_schedule + 70h], xmm7
aesimc xmm7, [key_schedule + 40h]
aesimc xmm6, [key_schedule + 60h]
movdqa [inverted_key_schedule + 40h], xmm6
movdqa [inverted_key_schedule + 60h], xmm7
aesimc xmm7, [key_schedule + 50h]
movdqa [inverted_key_schedule + 50h], xmm7
ret
expand_keys_128ecb endp
end
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