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/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* Hashing
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* This implementation is adapted and redistributed from the RHASH
* project
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#include "config.h"
#include <ouroboros/hash.h>
#ifndef HAVE_LIBGCRYPT
#include <ouroboros/crc32.h>
#include <ouroboros/md5.h>
#include <ouroboros/sha3.h>
#else
#include <gcrypt.h>
#endif
#include <string.h>
#include <assert.h>
#include <stdbool.h>
uint16_t hash_len(enum hash_algo algo)
{
#ifdef HAVE_LIBGCRYPT
return (uint16_t) gcry_md_get_algo_dlen(algo);
#else
switch (algo) {
case HASH_CRC32:
return CRC32_HASH_LEN;
case HASH_MD5:
return MD5_HASH_LEN;
case HASH_SHA3_224:
return SHA3_224_HASH_LEN;
case HASH_SHA3_256:
return SHA3_256_HASH_LEN;
case HASH_SHA3_384:
return SHA3_384_HASH_LEN;
case HASH_SHA3_512:
return SHA3_512_HASH_LEN;
default:
assert(false);
break;
}
return 0;
#endif
}
void mem_hash(enum hash_algo algo,
void * dst,
const uint8_t * buf,
size_t len)
{
#ifdef HAVE_LIBGCRYPT
gcry_md_hash_buffer(algo, dst, buf, len);
#else
struct sha3_ctx sha3_ctx;
struct md5_ctx md5_ctx;
switch (algo) {
case HASH_CRC32:
memset(dst, 0, CRC32_HASH_LEN);
crc32((uint32_t *) dst, buf, len);
break;
case HASH_MD5:
rhash_md5_init(&md5_ctx);
rhash_md5_update(&md5_ctx, buf, len);
rhash_md5_final(&md5_ctx, (uint8_t *) dst);
break;
case HASH_SHA3_224:
rhash_sha3_224_init(&sha3_ctx);
rhash_sha3_update(&sha3_ctx, buf, len);
rhash_sha3_final(&sha3_ctx, (uint8_t *) dst);
break;
case HASH_SHA3_256:
rhash_sha3_256_init(&sha3_ctx);
rhash_sha3_update(&sha3_ctx, buf, len);
rhash_sha3_final(&sha3_ctx, (uint8_t *) dst);
break;
case HASH_SHA3_384:
rhash_sha3_384_init(&sha3_ctx);
rhash_sha3_update(&sha3_ctx, buf, len);
rhash_sha3_final(&sha3_ctx, (uint8_t *) dst);
break;
case HASH_SHA3_512:
rhash_sha3_512_init(&sha3_ctx);
rhash_sha3_update(&sha3_ctx, buf, len);
rhash_sha3_final(&sha3_ctx, (uint8_t *) dst);
break;
default:
assert(false);
break;
}
#endif
}
void str_hash(enum hash_algo algo,
void * dst,
const char * str)
{
return mem_hash(algo, dst, (const uint8_t *) str, strlen(str));
}
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