forked from KolibriOS/kolibrios
109 lines
3.3 KiB
PHP
109 lines
3.3 KiB
PHP
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; aes256-ctr.inc - AES256 Counter Mode
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;
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; Copyright (C) 2016 Ivan Baravy (dunkaist)
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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_ctr_context aes256_context
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counter rb 16
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output rb 16 ; counter after aes_crypt
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ends
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proc aes256_ctr_init _counter
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push ebx esi edi
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mcall 68, 12, sizeof.aes256_ctr_context
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; handle errors
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mov ecx, 16/4
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mov esi, [_counter]
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lea edi, [eax + aes256_ctr_context.counter]
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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_ctr_crypt _ctx, _in, _out
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push ebx esi edi
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DEBUGF 1,'plain : '
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stdcall dump_128bit_hex, [_in]
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DEBUGF 1,'\n'
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mov esi, [_ctx]
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lea eax, [esi + aes256_ctr_context.key]
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lea ebx, [esi + aes256_ctr_context.counter]
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lea ecx, [esi + aes256_ctr_context.output]
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stdcall aes256_encrypt, eax, ebx, ecx ; Key, in, out
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mov ebx, [_ctx]
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mov esi, [_in]
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mov edi, [_out]
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mov eax, [esi + 4*0]
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xor eax, dword[ebx + aes256_ctr_context.output + 4*0]
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mov [edi + 4*0], eax
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mov eax, [esi + 4*1]
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xor eax, dword[ebx + aes256_ctr_context.output + 4*1]
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mov [edi + 4*1], eax
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mov eax, [esi + 4*2]
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xor eax, dword[ebx + aes256_ctr_context.output + 4*2]
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mov [edi + 4*2], eax
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mov eax, [esi + 4*3]
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xor eax, dword[ebx + aes256_ctr_context.output + 4*3]
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mov [edi + 4*3], eax
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; Increment counter
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mov esi, [_ctx]
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mov eax, dword[esi + aes256_ctr_context.counter + 4*0]
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mov ebx, dword[esi + aes256_ctr_context.counter + 4*1]
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mov ecx, dword[esi + aes256_ctr_context.counter + 4*2]
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mov edx, dword[esi + aes256_ctr_context.counter + 4*3]
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bswap eax
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bswap ebx
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bswap ecx
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bswap edx
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inc edx
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adc ecx, 0
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adc ebx, 0
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adc eax, 0
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bswap eax
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bswap ebx
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bswap ecx
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bswap edx
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mov dword[esi + aes256_ctr_context.counter + 4*0], eax
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mov dword[esi + aes256_ctr_context.counter + 4*1], ebx
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mov dword[esi + aes256_ctr_context.counter + 4*2], ecx
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mov dword[esi + aes256_ctr_context.counter + 4*3], edx
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DEBUGF 1,'cipher : '
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stdcall dump_128bit_hex, [_out]
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DEBUGF 1,'\n\n'
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pop edi esi ebx
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ret
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endp
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