138 lines
3.8 KiB
NASM
138 lines
3.8 KiB
NASM
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; libcrash -- cryptographic hash (and other) functions
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;
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; Copyright (C) <2016> Jeffrey Amelynck
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; Copyright (C) <2016,2021> Ivan Baravy
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;
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; SPDX-License-Identifier: GPL-2.0-or-later
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;
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; This program is free software: you can redistribute it and/or modify it under
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; the terms of the GNU General Public License as published by the Free Software
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; Foundation, either version 2 of the License, or (at your option) any later
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; version.
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;
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; This program is distributed in the hope that it will be useful, but WITHOUT
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; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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; FOR A PARTICULAR PURPOSE. See the 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 along with
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; this program. If not, see <http://www.gnu.org/licenses/>.
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struct ctx_aes_ctr
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aes ctx_aes
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ctr ctx_ctr
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ends
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assert sizeof.ctx_aes_ctr <= LIBCRASH_CTX_LEN
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; _crypt: 0/1 = encrypt/decrypt
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proc aes256ctr.init uses ebx, _ctx, _key, _iv, _flags
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mov ebx, [_ctx]
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stdcall aes256.init, ebx, [_key], LIBCRASH_CIPHER_ENCRYPT
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add ebx, ctx_aes_ctr.ctr
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stdcall ctr.init, [_iv]
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ret
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endp
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proc a22es_ctr._.block_init _ctx
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mov edi, [_ctx]
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lea esi, [edi+ctx_aes_ctr.ctr.block_counter]
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mov ecx, AES_BLOCK_SIZE/4
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rep movsd
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ret
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endp
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proc aes256ctr.update uses ebx esi edi, _ctx, _in, _len, _out
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mov eax, [_len]
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pushad
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mov ebx, [_ctx]
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mov edi, [_in]
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mov edx, [ebx+ctx_aes_ctr.ctr.partial_cnt]
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.next_chunk:
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mov ecx, [_len]
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test ecx, ecx
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jz .done
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test edx, edx
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jnz @f
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pushad
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lea ecx, [ebx+ctx_aes_ctr.ctr.block_counter]
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lea edx, [ebx+ctx_aes_ctr.aes.state]
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stdcall aes.encrypt, ebx, ecx, edx
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popad
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mov edx, AES_BLOCK_SIZE
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pushad
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mov esi, ebx
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mov eax, dword[esi+ctx_aes_ctr.ctr.block_counter+4*0]
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mov ebx, dword[esi+ctx_aes_ctr.ctr.block_counter+4*1]
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mov ecx, dword[esi+ctx_aes_ctr.ctr.block_counter+4*2]
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mov edx, dword[esi+ctx_aes_ctr.ctr.block_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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add edx, 1
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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+ctx_aes_ctr.ctr.block_counter+4*0], eax
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mov dword[esi+ctx_aes_ctr.ctr.block_counter+4*1], ebx
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mov dword[esi+ctx_aes_ctr.ctr.block_counter+4*2], ecx
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mov dword[esi+ctx_aes_ctr.ctr.block_counter+4*3], edx
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popad
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@@:
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cmp ecx, edx
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jbe @f
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mov ecx, edx
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@@:
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lea esi, [ebx+ctx_aes_ctr.aes.state]
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add esi, AES_BLOCK_SIZE
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sub esi, edx
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sub [_len], ecx
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sub edx, ecx
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push ebx
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mov edi, [_out]
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mov ebx, [_in]
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add [_in], ecx
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add [_out], ecx
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@@:
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lodsb
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xor al, [ebx]
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inc ebx
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stosb
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loop @b
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pop ebx
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jmp .next_chunk
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.done:
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mov [ebx+ctx_aes_ctr.ctr.partial_cnt], edx
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popad
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ret
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endp
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proc aes256ctr.finish _ctx, _out
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xor eax, eax
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ret
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endp
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proc aes256ctr.oneshot _ctx, _key, _iv, _flags, _in, _len, _out
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locals
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.done dd ?
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endl
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mov [.done], 0
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stdcall aes256ctr.init, [_ctx], [_key], [_iv], [_flags]
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stdcall aes256ctr.update, [_ctx], [_in], [_len], [_out]
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add [_out], eax
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add [.done], eax
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stdcall aes256ctr.finish, [_ctx], [_out]
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add eax, [.done]
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ret
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endp
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