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/*
* Ouroboros - Copyright (C) 2016 - 2024
*
* Hashing
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* 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/.
*/
#if defined(__linux__) || defined(__CYGWIN__)
#define _DEFAULT_SOURCE
#endif
#include "config.h"
#include <ouroboros/endian.h>
#include <ouroboros/hash.h>
#ifdef HAVE_LIBGCRYPT
#include <gcrypt.h>
#else
#include <ouroboros/crc32.h>
#include <ouroboros/md5.h>
#include <ouroboros/sha3.h>
#endif
#include <string.h>
#include <assert.h>
#include <stdbool.h>
#ifdef HAVE_LIBGCRYPT
int gcry_algo_tbl [] = {
/* DIR_HASH policies first */
GCRY_MD_SHA3_224,
GCRY_MD_SHA3_256,
GCRY_MD_SHA3_384,
GCRY_MD_SHA3_512,
/* Below for internal use only */
GCRY_MD_CRC32,
GCRY_MD_MD5,
};
#else
int hash_len_tbl [] = {
/* DIR_HASH policies first */
SHA3_224_HASH_LEN,
SHA3_256_HASH_LEN,
SHA3_384_HASH_LEN,
SHA3_512_HASH_LEN,
/* Below for internal use only */
CRC32_HASH_LEN,
MD5_HASH_LEN
};
#endif
uint16_t hash_len(enum hash_algo algo)
{
#ifdef HAVE_LIBGCRYPT
return (uint16_t) gcry_md_get_algo_dlen(gcry_algo_tbl[algo]);
#else
return hash_len_tbl[algo];
#endif
}
void mem_hash(enum hash_algo algo,
void * dst,
const uint8_t * buf,
size_t len)
{
#ifdef HAVE_LIBGCRYPT
gcry_md_hash_buffer(gcry_algo_tbl[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);
*(uint32_t *) dst = htobe32(*(uint32_t *) dst);
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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