/* bca-eax.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 "bcal-basic.h"
#include "bcal-eax.h"
#include "memxor.h"
-uint8_t bcal_eax_init(const bcdesc_t *desc, const void *key, uint16_t keysize_b, bcal_eax_ctx_t *ctx){
- uint8_t r;
- ctx->blocksize_B = (bcal_cipher_getBlocksize_b(desc)+7)/8;
- ctx->nonce = malloc(ctx->blocksize_B);
- if(ctx->nonce==NULL){
- return 0x81;
- }
- r = bcal_cmac_init(desc, key, keysize_b, &(ctx->ctag));
- if(r){
- return r;
- }
- r = bcal_cmac_init(desc, key, keysize_b, &(ctx->htag));
- if(r){
- return (r|0x10);
- }
- r = bcal_cmac_init(desc, key, keysize_b, &(ctx->ntag));
- if(r){
- return (r|0x20);
- }
- r = bcal_ctr_init(desc, key, keysize_b, NULL, &(ctx->cipher));
- if(r){
- return (r|0x30);
- }
- ctx->header_set=0;
- uint8_t tmp[ctx->blocksize_B];
- memset(tmp, 0, ctx->blocksize_B);
- bcal_cmac_nextBlock(&(ctx->ntag), tmp);
- tmp[ctx->blocksize_B-1]=1;
- bcal_cmac_nextBlock(&(ctx->htag), tmp);
- tmp[ctx->blocksize_B-1]=2;
- bcal_cmac_nextBlock(&(ctx->ctag), tmp);
- return 0;
+uint8_t bcal_eax_init(const bcdesc_t *desc, const void *key, uint16_t keysize_b,
+ bcal_eax_ctx_t *ctx)
+{
+ uint8_t r;
+ ctx->blocksize_B = (bcal_cipher_getBlocksize_b(desc) + 7) / 8;
+ ctx->nonce = malloc(ctx->blocksize_B);
+ if (ctx->nonce == NULL) {
+ return 0x81;
+ }
+ r = bcal_cmac_init(desc, key, keysize_b, &(ctx->ctag));
+ if (r) {
+ return r;
+ }
+ r = bcal_cmac_init(desc, key, keysize_b, &(ctx->htag));
+ if (r) {
+ return (r | 0x10);
+ }
+ r = bcal_cmac_init(desc, key, keysize_b, &(ctx->ntag));
+ if (r) {
+ return (r | 0x20);
+ }
+ r = bcal_ctr_init(desc, key, keysize_b, NULL, &(ctx->cipher));
+ if (r) {
+ return (r | 0x30);
+ }
+ ctx->header_set = 0;
+ uint8_t tmp[ctx->blocksize_B];
+ memset(tmp, 0, ctx->blocksize_B);
+ bcal_cmac_nextBlock(&(ctx->ntag), tmp);
+ tmp[ctx->blocksize_B - 1] = 1;
+ bcal_cmac_nextBlock(&(ctx->htag), tmp);
+ tmp[ctx->blocksize_B - 1] = 2;
+ bcal_cmac_nextBlock(&(ctx->ctag), tmp);
+ return 0;
}
-void bcal_eax_free(bcal_eax_ctx_t *ctx){
- bcal_ctr_free(&(ctx->cipher));
- bcal_cmac_free(&(ctx->ctag));
- bcal_cmac_free(&(ctx->htag));
- bcal_cmac_free(&(ctx->ntag));
- free(ctx->nonce);
+void bcal_eax_free(bcal_eax_ctx_t *ctx)
+{
+ bcal_ctr_free(&(ctx->cipher));
+ bcal_cmac_free(&(ctx->ctag));
+ bcal_cmac_free(&(ctx->htag));
+ bcal_cmac_free(&(ctx->ntag));
+ free(ctx->nonce);
}
-void bcal_eax_loadNonce(const void *nonce, uint16_t length_b, bcal_eax_ctx_t *ctx){
- bcal_cmac_lastBlock(&(ctx->ntag), nonce, length_b);
- bcal_cmac_ctx2mac(ctx->nonce, ctx->blocksize_B*8, &(ctx->ntag));
- bcal_ctr_loadIV(ctx->nonce, &(ctx->cipher));
+void bcal_eax_loadNonce(const void *nonce, uint16_t length_b,
+ bcal_eax_ctx_t *ctx)
+{
+ bcal_cmac_lastBlock(&(ctx->ntag), nonce, length_b);
+ bcal_cmac_ctx2mac(ctx->nonce, ctx->blocksize_B * 8, &(ctx->ntag));
+ bcal_ctr_loadIV(ctx->nonce, &(ctx->cipher));
}
-void bcal_eax_addNextHeader(const void *header, bcal_eax_ctx_t *ctx){
- bcal_cmac_nextBlock(&(ctx->htag), header);
+void bcal_eax_addNextHeader(const void *header, bcal_eax_ctx_t *ctx)
+{
+ bcal_cmac_nextBlock(&(ctx->htag), header);
}
-void bcal_eax_addLastHeader(const void *header, uint16_t length_b, bcal_eax_ctx_t *ctx){
- bcal_cmac_lastBlock(&(ctx->htag), header, length_b);
- ctx->header_set = 1;
+void bcal_eax_addLastHeader(const void *header, uint16_t length_b,
+ bcal_eax_ctx_t *ctx)
+{
+ bcal_cmac_lastBlock(&(ctx->htag), header, length_b);
+ ctx->header_set = 1;
}
-void bcal_eax_encNextBlock(void *block, bcal_eax_ctx_t *ctx){
- bcal_ctr_encNext(block, &(ctx->cipher));
- bcal_cmac_nextBlock(&(ctx->ctag), block);
+void bcal_eax_encNextBlock(void *block, bcal_eax_ctx_t *ctx)
+{
+ bcal_ctr_encNext(block, &(ctx->cipher));
+ bcal_cmac_nextBlock(&(ctx->ctag), block);
}
-void bcal_eax_encLastBlock(void *block, uint16_t length_b, bcal_eax_ctx_t *ctx){
- bcal_ctr_encMsg(NULL, block, length_b, &(ctx->cipher));
- bcal_cmac_lastBlock(&(ctx->ctag), block, length_b);
+void bcal_eax_encLastBlock(void *block, uint16_t length_b, bcal_eax_ctx_t *ctx)
+{
+ bcal_ctr_encMsg(NULL, block, length_b, &(ctx->cipher));
+ bcal_cmac_lastBlock(&(ctx->ctag), block, length_b);
}
-void bcal_eax_decNextBlock(void *block, bcal_eax_ctx_t *ctx){
- bcal_cmac_nextBlock(&(ctx->ctag), block);
- bcal_ctr_decNext(block, &(ctx->cipher));
+void bcal_eax_decNextBlock(void *block, bcal_eax_ctx_t *ctx)
+{
+ bcal_cmac_nextBlock(&(ctx->ctag), block);
+ bcal_ctr_decNext(block, &(ctx->cipher));
}
-void bcal_eax_decLastBlock(void *block, uint16_t length_b, bcal_eax_ctx_t *ctx){
- bcal_cmac_lastBlock(&(ctx->ctag), block, length_b);
- bcal_ctr_decMsg(NULL, block, length_b, &(ctx->cipher));
+void bcal_eax_decLastBlock(void *block, uint16_t length_b, bcal_eax_ctx_t *ctx)
+{
+ bcal_cmac_lastBlock(&(ctx->ctag), block, length_b);
+ bcal_ctr_decMsg(NULL, block, length_b, &(ctx->cipher));
}
-void bcal_eax_ctx2tag(void *dest, uint16_t length_b, bcal_eax_ctx_t *ctx){
- uint8_t tmp[ctx->blocksize_B];
- if(ctx->header_set==0){
- bcal_cmac_lastBlock(&(ctx->htag), NULL, 0);
- }
+void bcal_eax_ctx2tag(void *dest, uint16_t length_b, bcal_eax_ctx_t *ctx)
+{
+ uint8_t tmp[ctx->blocksize_B];
+ if (ctx->header_set == 0) {
+ bcal_cmac_lastBlock(&(ctx->htag), NULL, 0);
+ }
- bcal_cmac_ctx2mac(tmp, ctx->blocksize_B*8, &(ctx->htag));
- memxor(ctx->nonce, tmp, ctx->blocksize_B);
+ bcal_cmac_ctx2mac(tmp, ctx->blocksize_B * 8, &(ctx->htag));
+ memxor(ctx->nonce, tmp, ctx->blocksize_B);
- bcal_cmac_ctx2mac(tmp, ctx->blocksize_B*8, &(ctx->ctag));
- memxor(ctx->nonce, tmp, ctx->blocksize_B);
- memcpy(dest, ctx->nonce, (length_b+7)/8);
+ bcal_cmac_ctx2mac(tmp, ctx->blocksize_B * 8, &(ctx->ctag));
+ memxor(ctx->nonce, tmp, ctx->blocksize_B);
+ memcpy(dest, ctx->nonce, (length_b + 7) / 8);
}
projects / avr-crypto-lib.git / blobdiff