3 This file is part of the AVR-Crypto-Lib.
4 Copyright (C) 2010 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/>.
23 #include "bcal-cfb_byte.h"
24 #include "bcal-basic.h"
28 uint8_t bcal_cfb_B_init(const bcdesc_t* desc, const void* key, uint16_t keysize, uint16_t size_b, bcal_cfb_B_ctx_t* ctx){
29 ctx->desc = (bcdesc_t*)desc;
30 ctx->blocksize_B = (bcal_cipher_getBlocksize_b(desc)+7)/8;
31 ctx->in_block=malloc(ctx->blocksize_B);
32 if(ctx->in_block==NULL){
38 ctx->size_B = size_b/8;
39 return bcal_cipher_init(desc, key, keysize, &(ctx->cctx));
42 void bcal_cfb_B_free(bcal_cfb_B_ctx_t* ctx){
44 bcal_cipher_free(&(ctx->cctx));
47 void bcal_cfb_B_loadIV(const void* iv, bcal_cfb_B_ctx_t* ctx){
48 memcpy(ctx->in_block, iv, ctx->blocksize_B);
51 void bcal_cfb_B_encNext(void* block, bcal_cfb_B_ctx_t* ctx){
52 uint8_t tmp[ctx->blocksize_B];
53 memcpy(tmp, ctx->in_block, ctx->blocksize_B);
54 bcal_cipher_enc(tmp, &(ctx->cctx));
55 memxor(block, tmp, ctx->size_B);
56 memmove(ctx->in_block, ctx->in_block+ctx->size_B, ctx->blocksize_B - ctx->size_B);
57 memcpy(ctx->in_block+ctx->blocksize_B-ctx->size_B, block, ctx->size_B);
60 void bcal_cfb_B_decNext(void* block, bcal_cfb_B_ctx_t* ctx){
61 uint8_t tmp[ctx->blocksize_B];
62 uint8_t xblock[ctx->size_B];
63 memcpy(xblock, block, ctx->size_B);
64 memcpy(tmp, ctx->in_block, ctx->blocksize_B);
65 bcal_cipher_enc(tmp, &(ctx->cctx));
66 memxor(block, tmp, ctx->size_B);
67 memmove(ctx->in_block, ctx->in_block+ctx->size_B, ctx->blocksize_B - ctx->size_B);
68 memcpy(ctx->in_block+ctx->blocksize_B-ctx->size_B, xblock, ctx->size_B);
71 void bcal_cfb_B_encMsg(const void* iv, void* msg, uint16_t msg_blocks, bcal_cfb_B_ctx_t* ctx){
72 bcal_cfb_B_loadIV(iv, ctx);
74 bcal_cfb_B_encNext(msg, ctx);
75 msg = (uint8_t*)msg+ctx->size_B;
79 void bcal_cfb_B_decMsg(const void* iv, void* msg, uint16_t msg_blocks, bcal_cfb_B_ctx_t* ctx){
80 bcal_cfb_B_loadIV(iv, ctx);
82 bcal_cfb_B_decNext(msg, ctx);
83 msg = (uint8_t*)msg+ctx->size_B;