3 This file is part of the AVR-Crypto-Lib.
4 Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 * \brief SHACAL1 encryption only implementation.
32 #include "shacal1_enc.h"
34 void shacal1_enc(void* buffer, void* key, uint16_t keysize_b){
35 sha1_ctx_t ctx, t_ctx;
37 memcpy(t_ctx.h, buffer, SHA1_HASH_BITS/8);
39 uint8_t keybuffer[SHA1_BLOCK_BITS/8];
40 memset(keybuffer, 0, SHA1_BLOCK_BITS/8);
41 if(keysize_b>SHA1_BLOCK_BITS)
42 keysize_b=SHA1_BLOCK_BITS;
43 memcpy(keybuffer, key, (keysize_b+7)/8);
45 memcpy(t_ctx.h, buffer, SHA1_HASH_BITS/8);
46 sha1_ctx2hash((sha1_hash_t*)(&(ctx.h[0])), &t_ctx);
47 memcpy(t_ctx.h, ctx.h, SHA1_HASH_BITS/8);
48 sha1_nextBlock(&ctx, keybuffer);
50 ctx.h[i] -= t_ctx.h[i];
51 sha1_ctx2hash(buffer, &ctx);