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;    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 .
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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