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