128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/* hfal-hmac.c */
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/*
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2009 Daniel Otte (daniel.otte@rub.de)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <avr/pgmspace.h>
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#include "hashfunction_descriptor.h"
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#include "hfal-basic.h"
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#include <stdlib.h>
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#define IPAD 0x36
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#define OPAD 0x5C
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uint8_t hfal_hmac_init(const hfdesc_t* hash_descriptor,
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hfhmacgen_ctx_t* ctx,
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const void* key, uint16_t keylength_b){
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uint16_t bs = hfal_hash_getBlocksize();
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uint8_t buffer[bs/8];
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uint8_t i;
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hf_init_fpt init;
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hf_nextBlock_fpt nextBlock;
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memset(buffer, 0, bs/8);
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ctx->desc = hash_descriptor;
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ctx->ctx = malloc(pgm_read_word(&(hash_descriptor->ctxsize_B)));
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ctx->finctx = malloc(pgm_read_word(&(hash_descriptor->ctxsize_B)));
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if(ctx->ctx==NULL && ctx->finctx==NULL)
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return 3;
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if(ctx->finctx==NULL){
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free(ctx->ctx)
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return 2;
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}
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if(ctx->ctx==NULL){
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free(ctx->finctx)
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return 1;
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}
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if(keylength_b>bs){
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hfal_hash_mem(hash_descriptor, buffer, key, keylength_b);
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} else {
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memcpy(buffer, key, (keylength_b+7)/8);
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}
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for(i=0; i<bs/8; ++i){
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buffer[i] ^= IPAD;
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}
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init = pgm_read_word(&(hash_descriptor->init));
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nextBlock = pgm_read_word(&(hash_descriptor->nextBlock));
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init(ctx->ctx);
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init(ctx->finctx);
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nextBlock(ctx->ctx, buffer);
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for(i=0; i<bs/8; ++i){
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buffer[i] ^= IPAD^OPAD;
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}
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nextBlock(ctx->finctx, buffer);
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memset(buffer, 0, bs/8);
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}
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void hfal_hmac_nextBlock(hfhmacgen_ctx_t* ctx, const void* block){
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hf_nextBlock_fpt nextBlock;
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nextBlock = pgm_read_word(&(hash_descriptor->nextBlock));
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nextBlock(ctx->ctx, block);
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}
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void hfal_hmac_lastBlock(hfhmacgen_ctx_t* ctx, const void* block, uint16_t length_b){
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hf_lastBlock_fpt lastBlock;
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hf_ctx2hash_fpt ctx2hash;
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uint16_t hs = pgm_read_word(&(hash_descriptor->hashsize_b));
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uint8_t buffer[(hs+7)/8];
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lastBlock = pgm_read_word(&(hash_descriptor->lastBlock));
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ctx2hash = pgm_read_word(&(hash_descriptor->ctx2hash));
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lastBlock(ctx->ctx, block, length_b);
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ctx2hash(buffer, ctx->ctx);
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lastBlock(ctx->finctx, buffer, hs);
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}
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void hfal_hmac_ctx2mac(void* dest, hfhmacgen_ctx_t* ctx){
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hf_ctx2hash_fpt ctx2hash;
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ctx2hash = pgm_read_word(&(hash_descriptor->ctx2hash));
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ctx2hash(dest, ctx->finctx);
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}
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void hfal_hmac_free(hfhmacgen_ctx_t* ctx){
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hf_free_fpt free_fpt;
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free_fpt = pgm_read_word(&(hash_descriptor->free));
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if(free_fpt){
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free_fpt(ctx->ctx);
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free_fpt(ctx->finctx);
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}
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free(ctx->ctx)
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free(ctx->finctx)
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}
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void hfal_hmac_mem(const hfdesc_t* hash_descriptor, const void* key, uint16_t keylength_b, void* dest, const void* msg, uint32_t length_b){
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hfhmacgen_ctx_t ctx;
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uint16_t bs = hfal_hash_getBlocksize();
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hfal_hmac_init(hash_descriptor, &ctx, key, keylength_b);
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while(length_b>bs){
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hfal_hmac_nextBlock(&ctx, msg);
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msg = msg + bs/8;
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length_b-=bs;
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}
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hfal_hmac_lastBlock(&ctx, msg, length_b);
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hfal_hmac_ctx2mac(dest, &ctx);
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hfal_free(&ctx);
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}
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uint16_t hfal_hmac_getBlocksize(const hfdesc_t* hash_descriptor){
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return hfal_hash_getBlocksize(hash_descriptor);
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}
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uint16_t hfal_hmac_getMACsize(const hfdesc_t* hash_descriptor){
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return hfal_hash_getHashsize(hash_descriptor);
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}
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