+++ /dev/null
-/* bcal-ctr.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-basic.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);
-}
-
-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_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_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_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);
-}
-