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 SHACAL2 encryption only implementation.
32 #include "shacal2_enc.h"
35 void shacal2_enc(void* buffer, void* key, uint16_t keysize_b){
37 sha256_ctx_t ctx, t_ctx;
38 memcpy(ctx.h, buffer, SHACAL2_BLOCKSIZE_B);
40 uint8_t keybuffer[SHACAL2_KEYSIZE_B];
41 memset(keybuffer, 0, SHACAL2_KEYSIZE_B);
42 if(keysize_b>SHACAL2_KEYSIZE)
43 keysize_b=SHACAL2_KEYSIZE;
44 memcpy(keybuffer, key, (keysize_b+7)/8);
46 memcpy(t_ctx.h, buffer, SHACAL2_BLOCKSIZE_B);
47 sha256_ctx2hash((sha256_hash_t*)(&(ctx.h[0])), &t_ctx);
48 memcpy(t_ctx.h, ctx.h, SHACAL2_BLOCKSIZE_B);
49 sha256_nextBlock(&ctx, keybuffer);
50 for(i=0; i<SHACAL2_BLOCKSIZE/32; ++i){
51 ctx.h[i] -= t_ctx.h[i];
53 sha256_ctx2hash(buffer, &ctx);