/* bcal-cfb_bit.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-cfb_bit.h"
#include "bcal-basic.h"
-static uint8_t read_bit(void *block, uint32_t index){
- uint8_t r;
- r=((uint8_t*)block)[index/8];
- r=(r&(0x80>>(index&7)))?0xff:0x00;
- return r;
+static uint8_t read_bit(void *block, uint32_t index)
+{
+ uint8_t r;
+ r = ((uint8_t*) block)[index / 8];
+ r = (r & (0x80 >> (index & 7))) ? 0xff : 0x00;
+ return r;
}
-static void write_bit(void *block, uint32_t index, uint8_t value){
- if(value){
- /* set bit */
- ((uint8_t*)block)[index/8] |= 0x80>>(index&7);
- }else{
- /* clear bit */
- ((uint8_t*)block)[index/8] &= ~(0x80>>(index&7));
- }
+static void write_bit(void *block, uint32_t index, uint8_t value)
+{
+ if (value) {
+ /* set bit */
+ ((uint8_t*) block)[index / 8] |= 0x80 >> (index & 7);
+ } else {
+ /* clear bit */
+ ((uint8_t*) block)[index / 8] &= ~(0x80 >> (index & 7));
+ }
}
-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>bcal_cipher_getBlocksize_b(desc)){
- return 0x12;
- }
- ctx->size_b = size_b;
- return bcal_cipher_init(desc, key, keysize_b, &(ctx->cctx));
+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 > bcal_cipher_getBlocksize_b(desc)) {
+ return 0x12;
+ }
+ ctx->size_b = size_b;
+ 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_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_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, uint8_t offset, bcal_cfb_b_ctx_t *ctx){
- uint8_t tmp[ctx->blocksize_B];
- offset &= 7;
- memcpy(tmp, ctx->in_block, ctx->blocksize_B);
- bcal_cipher_enc(tmp, &(ctx->cctx));
- uint16_t i,j;
- uint8_t a;
- for(i=0; i<ctx->blocksize_B*8-ctx->size_b; ++i){
- a = read_bit(ctx->in_block, i+ctx->size_b);
- write_bit(ctx->in_block, i, a);
- }
- for(j=offset,i=0; i<ctx->size_b; ++i, ++j){
- a = read_bit(tmp, i) ^ read_bit(block, j);
- write_bit(ctx->in_block, ctx->blocksize_B*8-ctx->size_b+i, a);
- write_bit(block, j, a);
- }
+void bcal_cfb_b_encNext(void *block, uint8_t offset, bcal_cfb_b_ctx_t *ctx)
+{
+ uint8_t tmp[ctx->blocksize_B];
+ offset &= 7;
+ memcpy(tmp, ctx->in_block, ctx->blocksize_B);
+ bcal_cipher_enc(tmp, &(ctx->cctx));
+ uint16_t i, j;
+ uint8_t a;
+ for (i = 0; i < ctx->blocksize_B * 8 - ctx->size_b; ++i) {
+ a = read_bit(ctx->in_block, i + ctx->size_b);
+ write_bit(ctx->in_block, i, a);
+ }
+ for (j = offset, i = 0; i < ctx->size_b; ++i, ++j) {
+ a = read_bit(tmp, i) ^ read_bit(block, j);
+ write_bit(ctx->in_block, ctx->blocksize_B * 8 - ctx->size_b + i, a);
+ write_bit(block, j, a);
+ }
}
-void bcal_cfb_b_decNext(void *block, uint8_t offset, bcal_cfb_b_ctx_t *ctx){
- uint8_t tmp[ctx->blocksize_B];
- offset &= 7;
- memcpy(tmp, ctx->in_block, ctx->blocksize_B);
- bcal_cipher_enc(tmp, &(ctx->cctx));
- uint16_t i,j;
- uint8_t a,b;
- for(i=0; i<ctx->blocksize_B*8-ctx->size_b; ++i){
- a = read_bit(ctx->in_block, i+ctx->size_b);
- write_bit(ctx->in_block, i, a);
- }
- for(j=offset,i=0; i<ctx->size_b; ++i, ++j){
- a = read_bit(tmp, i);
- b = read_bit(block, j);
- a ^= b;
- write_bit(ctx->in_block, ctx->blocksize_B*8-ctx->size_b+i, b);
- write_bit(block, j, a);
- }
+void bcal_cfb_b_decNext(void *block, uint8_t offset, bcal_cfb_b_ctx_t *ctx)
+{
+ uint8_t tmp[ctx->blocksize_B];
+ offset &= 7;
+ memcpy(tmp, ctx->in_block, ctx->blocksize_B);
+ bcal_cipher_enc(tmp, &(ctx->cctx));
+ uint16_t i, j;
+ uint8_t a, b;
+ for (i = 0; i < ctx->blocksize_B * 8 - ctx->size_b; ++i) {
+ a = read_bit(ctx->in_block, i + ctx->size_b);
+ write_bit(ctx->in_block, i, a);
+ }
+ for (j = offset, i = 0; i < ctx->size_b; ++i, ++j) {
+ a = read_bit(tmp, i);
+ b = read_bit(block, j);
+ a ^= b;
+ write_bit(ctx->in_block, ctx->blocksize_B * 8 - ctx->size_b + i, b);
+ write_bit(block, j, a);
+ }
}
-void bcal_cfb_b_encMsg(const void *iv, void *msg, uint8_t offset, uint32_t msg_blocks, bcal_cfb_b_ctx_t *ctx){
- bcal_cfb_b_loadIV(iv, ctx);
- uint32_t addr;
- addr = ((uint16_t)msg)*8+offset;
- while(msg_blocks--){
- msg = (void*)((uint16_t)(addr/8));
- offset = addr&7;
- bcal_cfb_b_encNext(msg, offset, ctx);
- addr += ctx->size_b;
- }
+void bcal_cfb_b_encMsg(const void *iv, void *msg, uint8_t offset,
+ uint32_t msg_blocks, bcal_cfb_b_ctx_t *ctx)
+{
+ bcal_cfb_b_loadIV(iv, ctx);
+ uint32_t addr;
+ addr = ((uint16_t) msg) * 8 + offset;
+ while (msg_blocks--) {
+ msg = (void*) ((uint16_t) (addr / 8));
+ offset = addr & 7;
+ bcal_cfb_b_encNext(msg, offset, ctx);
+ addr += ctx->size_b;
+ }
}
-void bcal_cfb_b_decMsg(const void *iv, void *msg, uint8_t offset, uint32_t msg_blocks, bcal_cfb_b_ctx_t *ctx){
- bcal_cfb_b_loadIV(iv, ctx);
- uint32_t addr;
- addr = ((uint16_t)msg)*8+offset;
- while(msg_blocks--){
- msg = (void*)((uint16_t)(addr/8));
- offset = addr&7;
- bcal_cfb_b_decNext(msg, offset, ctx);
- addr += ctx->size_b;
- }
+void bcal_cfb_b_decMsg(const void *iv, void *msg, uint8_t offset,
+ uint32_t msg_blocks, bcal_cfb_b_ctx_t *ctx)
+{
+ bcal_cfb_b_loadIV(iv, ctx);
+ uint32_t addr;
+ addr = ((uint16_t) msg) * 8 + offset;
+ while (msg_blocks--) {
+ msg = (void*) ((uint16_t) (addr / 8));
+ offset = addr & 7;
+ bcal_cfb_b_decNext(msg, offset, ctx);
+ addr += ctx->size_b;
+ }
}
projects / avr-crypto-lib.git / blobdiff