/* bcal-ctr.c */
/*
- This file is part of the AVR-Crypto-Lib.
- Copyright (C) 2010 Daniel Otte (daniel.otte@rub.de)
+ This file is part of the AVR-Crypto-Lib.
+ Copyright (C) 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 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/>.
-*/
+ 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-ctr.h"
#include "memxor.h"
-static void increment_be(void *block, uint8_t size_B){
- uint16_t c=1;
- do{
- --size_B;
- c += ((uint8_t*)block)[size_B];
- ((uint8_t*)block)[size_B] = (uint8_t)c;
- c>>=8;
- }while(size_B);
+static void increment_be(void *block, uint8_t size_B)
+{
+ uint16_t c = 1;
+ do {
+ --size_B;
+ c += ((uint8_t*) block)[size_B];
+ ((uint8_t*) block)[size_B] = (uint8_t) c;
+ c >>= 8;
+ } while (size_B);
}
-uint8_t bcal_ctr_init(const bcdesc_t *desc, const void *key, uint16_t keysize_b, inc_fp_t inc_func, bcal_ctr_ctx_t *ctx){
- ctx->desc = (bcdesc_t*)desc;
- if(inc_func){
- ctx->inc_func = inc_func;
- }else{
- ctx->inc_func = increment_be;
- }
- ctx->blocksize_B = (bcal_cipher_getBlocksize_b(desc)+7)/8;
- ctx->in_block=malloc(ctx->blocksize_B);
- if(ctx->in_block==NULL){
- return 0x11;
- }
- return bcal_cipher_init(desc, key, keysize_b, &(ctx->cctx));
+uint8_t bcal_ctr_init(const bcdesc_t *desc, const void *key, uint16_t keysize_b,
+ inc_fp_t inc_func, bcal_ctr_ctx_t *ctx)
+{
+ ctx->desc = (bcdesc_t*) desc;
+ if (inc_func) {
+ ctx->inc_func = inc_func;
+ } else {
+ ctx->inc_func = increment_be;
+ }
+ ctx->blocksize_B = (bcal_cipher_getBlocksize_b(desc) + 7) / 8;
+ ctx->in_block = malloc(ctx->blocksize_B);
+ if (ctx->in_block == NULL) {
+ return 0x11;
+ }
+ return bcal_cipher_init(desc, key, keysize_b, &(ctx->cctx));
}
-void bcal_ctr_free(bcal_ctr_ctx_t *ctx){
- free(ctx->in_block);
- bcal_cipher_free(&(ctx->cctx));
+void bcal_ctr_free(bcal_ctr_ctx_t *ctx)
+{
+ free(ctx->in_block);
+ bcal_cipher_free(&(ctx->cctx));
}
-void bcal_ctr_loadIV(const void *iv, bcal_ctr_ctx_t *ctx){
- if(iv){
- memcpy(ctx->in_block, iv, ctx->blocksize_B);
- }
+void bcal_ctr_loadIV(const void *iv, bcal_ctr_ctx_t *ctx)
+{
+ if (iv) {
+ memcpy(ctx->in_block, iv, ctx->blocksize_B);
+ }
}
-void bcal_ctr_encNext(void *block, bcal_ctr_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->blocksize_B);
- ctx->inc_func(ctx->in_block, ctx->blocksize_B);
+void bcal_ctr_encNext(void *block, bcal_ctr_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->blocksize_B);
+ ctx->inc_func(ctx->in_block, ctx->blocksize_B);
}
-void bcal_ctr_decNext(void *block, bcal_ctr_ctx_t *ctx){
- bcal_ctr_encNext(block, ctx);
+void bcal_ctr_decNext(void *block, bcal_ctr_ctx_t *ctx)
+{
+ bcal_ctr_encNext(block, ctx);
}
-void bcal_ctr_encMsg(const void *iv, void *msg, uint32_t msg_len_b, bcal_ctr_ctx_t *ctx){
- bcal_ctr_loadIV(iv, ctx);
- uint16_t blocksize_b;
- blocksize_b = ctx->blocksize_B*8;
- while(msg_len_b>blocksize_b){
- bcal_ctr_encNext(msg, ctx);
- msg_len_b -= blocksize_b;
- msg = (uint8_t*)msg + ctx->blocksize_B;
- }
- uint8_t tmp[ctx->blocksize_B];
- memcpy(tmp, ctx->in_block, ctx->blocksize_B);
- bcal_cipher_enc(tmp, &(ctx->cctx));
- ctx->inc_func(ctx->in_block, ctx->blocksize_B);
- tmp[msg_len_b/8] = 0xff00>>(msg_len_b&7);
- memxor(msg, tmp, (msg_len_b+7)/8);
+void bcal_ctr_encMsg(const void *iv, void *msg, uint32_t msg_len_b,
+ bcal_ctr_ctx_t *ctx)
+{
+ bcal_ctr_loadIV(iv, ctx);
+ uint16_t blocksize_b;
+ blocksize_b = ctx->blocksize_B * 8;
+ while (msg_len_b > blocksize_b) {
+ bcal_ctr_encNext(msg, ctx);
+ msg_len_b -= blocksize_b;
+ msg = (uint8_t*) msg + ctx->blocksize_B;
+ }
+ uint8_t tmp[ctx->blocksize_B];
+ memcpy(tmp, ctx->in_block, ctx->blocksize_B);
+ bcal_cipher_enc(tmp, &(ctx->cctx));
+ ctx->inc_func(ctx->in_block, ctx->blocksize_B);
+ tmp[msg_len_b / 8] = 0xff00 >> (msg_len_b & 7);
+ memxor(msg, tmp, (msg_len_b + 7) / 8);
}
-void bcal_ctr_decMsg(const void *iv, void *msg, uint32_t msg_len_b, bcal_ctr_ctx_t *ctx){
- bcal_ctr_encMsg(iv, msg, msg_len_b, ctx);
+void bcal_ctr_decMsg(const void *iv, void *msg, uint32_t msg_len_b,
+ bcal_ctr_ctx_t *ctx)
+{
+ bcal_ctr_encMsg(iv, msg, msg_len_b, ctx);
}
projects / avr-crypto-lib.git / blobdiff