kolibrios/programs/network/ssh/aes256-cbc.inc

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; aes256-cbc.inc - AES256 Cipher Block Chaining
;
; Copyright (C) 2016 Jeffrey Amelynck
;
; This program is free software: you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation, either version 3 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program. If not, see <http://www.gnu.org/licenses/>.
struct aes256_cbc_context aes256_context
vector rb AES256_BLOCKSIZE
ends
proc aes256_cbc_init _vector
push ebx esi edi
mcall 68, 12, sizeof.aes256_cbc_context
; handle errors
mov ecx, AES256_BLOCKSIZE/4
mov esi, [_vector]
lea edi, [eax + aes256_cbc_context.vector]
rep movsd
; rep movsd is slow, but we don't care while init
pop edi esi ebx
ret
endp
proc aes256_cbc_encrypt _ctx, _in, _out
push ebx esi edi
DEBUGF 1,'plain : '
stdcall dump_hex, [_in], 4
mov edi, [_ctx]
lea edi, [edi + aes256_cbc_context.vector]
mov esi, [_in]
repeat AES256_BLOCKSIZE/4
lodsd
xor eax, [edi]
stosd
end repeat
mov esi, [_ctx]
lea eax, [esi + aes256_cbc_context.key]
lea ebx, [esi + aes256_cbc_context.vector]
stdcall aes256_encrypt, eax, ebx, [_out] ; Key, in, out
mov esi, [_out]
mov eax, [_ctx]
lea edi, [eax + aes256_cbc_context.vector]
repeat AES256_BLOCKSIZE/4
movsd
end repeat
DEBUGF 1,'cipher : '
stdcall dump_hex, [_out], 4
pop edi esi ebx
ret
endp
proc aes256_cbc_decrypt _ctx, _in, _out
locals
temp_iv rb AES256_BLOCKSIZE
endl
push ebx esi edi
DEBUGF 1,'cipher : '
stdcall dump_hex, [_in], 4
mov esi, [_in]
lea edi, [temp_iv]
repeat AES256_BLOCKSIZE/4
movsd
end repeat
mov esi, [_ctx]
lea eax, [esi + aes256_cbc_context.key]
stdcall aes256_decrypt, eax, [_in], [_out] ; Key, in, out
mov esi, [_ctx]
lea esi, [esi + aes256_cbc_context.vector]
mov edi, [_out]
repeat AES256_BLOCKSIZE/4
lodsd
xor eax, [edi]
stosd
end repeat
lea esi, [temp_iv]
mov edi, [_ctx]
lea edi, [edi + aes256_cbc_context.vector]
repeat AES256_BLOCKSIZE/4
movsd
end repeat
DEBUGF 1,'plain : '
stdcall dump_hex, [_out], 4
pop edi esi ebx
ret
endp