macro chn x, y, z
{
mov eax, [y]
xor eax, [z]
and eax, [x]
xor eax, [z]
}
macro maj x, y, z
{
mov eax, [x]
xor eax, [y]
and eax, [z]
mov ecx, [x]
and ecx, [y]
xor eax, ecx
}
macro Sigma0 x
{
mov eax, x
mov ecx, eax
ror ecx, 2
ror eax, 13
xor eax, ecx
mov ecx, x
ror ecx, 22
xor eax, ecx
}
macro Sigma1 x
{
mov eax, x
mov ecx, eax
ror ecx, 6
ror eax, 11
xor eax, ecx
mov ecx, x
ror ecx, 25
xor eax, ecx
}
macro sigma0 x
{
mov eax, x
mov ecx, eax
ror ecx, 7
ror eax, 18
xor eax, ecx
mov ecx, x
shr ecx, 3
xor eax, ecx
}
macro sigma1 x
{
mov eax, x
mov ecx, eax
ror ecx, 17
ror eax, 19
xor eax, ecx
mov ecx, x
shr ecx, 10
xor eax, ecx
}
macro recalculate_w n
{
mov edx, [w + ((n-2) and 15)*4]
sigma1 edx
add eax, [w + ((n-7) and 15)*4]
push eax
mov edx, [w + ((n-15) and 15)*4]
sigma0 edx
pop ecx
add eax, ecx
add [w + (n)*4], eax
}
macro crash.sha256.round a, b, c, d, e, f, g, h, k
{
mov ebx, [h]
mov edx, [e]
Sigma1 edx
add ebx, eax
chn e, f, g
add ebx, eax
add ebx, [k]
add ebx, edi
add [d], ebx
mov edx, [a]
Sigma0 edx
add ebx, eax
maj a, b, c
add eax, ebx
mov [h], eax
}
macro crash.sha256.round_1_16 a, b, c, d, e, f, g, h, n
{
mov eax, [esi + (n)*4]
bswap eax
mov dword[w + (n)*4], eax
mov edi, eax
crash.sha256.round a, b, c, d, e, f, g, h, (crash._.sha256_table + (n)*4)
}
macro crash.sha256.round_17_64 a, b, c, d, e, f, g, h, n, rep_num
{
recalculate_w n
mov edi, [w + (n)*4]
crash.sha256.round a, b, c, d, e, f, g, h, (crash._.sha256_table + (n+16*rep_num)*4)
}
proc crash.sha256 _sha256, _data, _len, _callback, _msglen
locals
final rd 1
w rd 64
A rd 1
B rd 1
C rd 1
D rd 1
E rd 1
F rd 1
G rd 1
H rd 1
endl
mov [final], 0
.first:
mov eax, [_msglen]
mov ecx, [_len]
add [eax], ecx
mov esi, [_data]
test ecx, ecx
jz .callback
.begin:
sub [_len], 64
jnc @f
add [_len], 64
jmp .endofblock
@@:
mov edi, [_sha256]
mov eax, [edi + 0x00]
mov [A], eax
mov eax, [edi + 0x04]
mov [B], eax
mov eax, [edi + 0x08]
mov [C], eax
mov eax, [edi + 0x0c]
mov [D], eax
mov eax, [edi + 0x10]
mov [E], eax
mov eax, [edi + 0x14]
mov [F], eax
mov eax, [edi + 0x18]
mov [G], eax
mov eax, [edi + 0x1c]
mov [H], eax
crash.sha256.round_1_16 A, B, C, D, E, F, G, H, 0
crash.sha256.round_1_16 H, A, B, C, D, E, F, G, 1
crash.sha256.round_1_16 G, H, A, B, C, D, E, F, 2
crash.sha256.round_1_16 F, G, H, A, B, C, D, E, 3
crash.sha256.round_1_16 E, F, G, H, A, B, C, D, 4
crash.sha256.round_1_16 D, E, F, G, H, A, B, C, 5
crash.sha256.round_1_16 C, D, E, F, G, H, A, B, 6
crash.sha256.round_1_16 B, C, D, E, F, G, H, A, 7
crash.sha256.round_1_16 A, B, C, D, E, F, G, H, 8
crash.sha256.round_1_16 H, A, B, C, D, E, F, G, 9
crash.sha256.round_1_16 G, H, A, B, C, D, E, F, 10
crash.sha256.round_1_16 F, G, H, A, B, C, D, E, 11
crash.sha256.round_1_16 E, F, G, H, A, B, C, D, 12
crash.sha256.round_1_16 D, E, F, G, H, A, B, C, 13
crash.sha256.round_1_16 C, D, E, F, G, H, A, B, 14
crash.sha256.round_1_16 B, C, D, E, F, G, H, A, 15
repeat 3
crash.sha256.round_17_64 A, B, C, D, E, F, G, H, 0, %
crash.sha256.round_17_64 H, A, B, C, D, E, F, G, 1, %
crash.sha256.round_17_64 G, H, A, B, C, D, E, F, 2, %
crash.sha256.round_17_64 F, G, H, A, B, C, D, E, 3, %
crash.sha256.round_17_64 E, F, G, H, A, B, C, D, 4, %
crash.sha256.round_17_64 D, E, F, G, H, A, B, C, 5, %
crash.sha256.round_17_64 C, D, E, F, G, H, A, B, 6, %
crash.sha256.round_17_64 B, C, D, E, F, G, H, A, 7, %
crash.sha256.round_17_64 A, B, C, D, E, F, G, H, 8, %
crash.sha256.round_17_64 H, A, B, C, D, E, F, G, 9, %
crash.sha256.round_17_64 G, H, A, B, C, D, E, F, 10, %
crash.sha256.round_17_64 F, G, H, A, B, C, D, E, 11, %
crash.sha256.round_17_64 E, F, G, H, A, B, C, D, 12, %
crash.sha256.round_17_64 D, E, F, G, H, A, B, C, 13, %
crash.sha256.round_17_64 C, D, E, F, G, H, A, B, 14, %
crash.sha256.round_17_64 B, C, D, E, F, G, H, A, 15, %
end repeat
mov edi, [_sha256]
mov eax, [A]
add [edi + 0x00], eax
mov eax, [B]
add [edi + 0x04], eax
mov eax, [C]
add [edi + 0x08], eax
mov eax, [D]
add [edi + 0x0c], eax
mov eax, [E]
add [edi + 0x10], eax
mov eax, [F]
add [edi + 0x14], eax
mov eax, [G]
add [edi + 0x18], eax
mov eax, [H]
add [edi + 0x1c], eax
add esi, 64
jmp .begin
.endofblock:
cmp [final], 1
je .quit
.callback:
mov eax, [_callback]
test eax, eax
jz @f
call eax
test eax, eax
jz @f
mov [_len], eax
jmp .first
@@:
mov edi, [_data]
mov ecx, [_len]
rep movsb
mov eax, [_msglen]
mov eax, [eax]
and eax, 63
mov ecx, 56
sub ecx, eax
ja @f
add ecx, 64
@@:
add [_len], ecx
mov byte[edi], 0x80
add edi, 1
sub ecx, 1
mov al, 0
rep stosb
mov eax, [_msglen]
mov eax, [eax]
mov edx, 8
mul edx
bswap eax
bswap edx
mov dword[edi], edx
mov dword[edi + 4], eax
add [_len], 8
mov [final], 1
jmp .first
.quit:
mov esi, [_sha256]
mov edi, esi
mov ecx, 8
@@:
lodsd
bswap eax
stosd
sub ecx, 1
jnz @b
ret
endp