--- /dev/null
+/* bcal-cfb_byte.c */
+/*
+ This file is part of the ARM-Crypto-Lib.
+ Copyright (C) 2006-2010 Daniel Otte (daniel.otte@rub.de)
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#include <stdint.h>
+#include <string.h>
+#include "bcal-cfb_byte.h"
+#include "bcal-basic.h"
+#include "memxor/memxor.h"
+
+
+uint8_t bcal_cfb_B_init(const bcdesc_t* desc, const void* key, uint16_t keysize_b, uint16_t size_b, bcal_cfb_B_ctx_t* ctx){
+ ctx->desc = (bcdesc_t*)desc;
+ ctx->blocksize_B = (bcal_cipher_getBlocksize_b(desc)+7)/8;
+ ctx->in_block=malloc(ctx->blocksize_B);
+ if(ctx->in_block==NULL){
+ return 0x11;
+ }
+ if(size_b&7){
+ return 0x12;
+ }
+ ctx->size_B = size_b/8;
+ return bcal_cipher_init(desc, key, keysize_b, &(ctx->cctx));
+}
+
+void bcal_cfb_B_free(bcal_cfb_B_ctx_t* ctx){
+ free(ctx->in_block);
+ bcal_cipher_free(&(ctx->cctx));
+}
+
+void bcal_cfb_B_loadIV(const void* iv, bcal_cfb_B_ctx_t* ctx){
+ if(iv){
+ memcpy(ctx->in_block, iv, ctx->blocksize_B);
+ }
+}
+
+void bcal_cfb_B_encNext(void* block, bcal_cfb_B_ctx_t* ctx){
+ uint8_t tmp[ctx->blocksize_B];
+ memcpy(tmp, ctx->in_block, ctx->blocksize_B);
+ bcal_cipher_enc(tmp, &(ctx->cctx));
+ memxor(block, tmp, ctx->size_B);
+ memmove(ctx->in_block, ctx->in_block+ctx->size_B, ctx->blocksize_B - ctx->size_B);
+ memcpy(ctx->in_block+ctx->blocksize_B-ctx->size_B, block, ctx->size_B);
+}
+
+void bcal_cfb_B_decNext(void* block, bcal_cfb_B_ctx_t* ctx){
+ uint8_t tmp[ctx->blocksize_B];
+ uint8_t xblock[ctx->size_B];
+ memcpy(xblock, block, ctx->size_B);
+ memcpy(tmp, ctx->in_block, ctx->blocksize_B);
+ bcal_cipher_enc(tmp, &(ctx->cctx));
+ memxor(block, tmp, ctx->size_B);
+ memmove(ctx->in_block, ctx->in_block+ctx->size_B, ctx->blocksize_B - ctx->size_B);
+ memcpy(ctx->in_block+ctx->blocksize_B-ctx->size_B, xblock, ctx->size_B);
+}
+
+void bcal_cfb_B_encMsg(const void* iv, void* msg, uint16_t msg_blocks, bcal_cfb_B_ctx_t* ctx){
+ bcal_cfb_B_loadIV(iv, ctx);
+ while(msg_blocks--){
+ bcal_cfb_B_encNext(msg, ctx);
+ msg = (uint8_t*)msg+ctx->size_B;
+ }
+}
+
+void bcal_cfb_B_decMsg(const void* iv, void* msg, uint16_t msg_blocks, bcal_cfb_B_ctx_t* ctx){
+ bcal_cfb_B_loadIV(iv, ctx);
+ while(msg_blocks--){
+ bcal_cfb_B_decNext(msg, ctx);
+ msg = (uint8_t*)msg+ctx->size_B;
+ }
+}
+