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/*
* Copyright (C) 2009 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "gcrypt_hasher.h"
#include <debug.h>
#include <gcrypt.h>
typedef struct private_gcrypt_hasher_t private_gcrypt_hasher_t;
/**
* Private data of gcrypt_hasher_t
*/
struct private_gcrypt_hasher_t {
/**
* Public part of this class.
*/
gcrypt_hasher_t public;
/**
* gcrypt hasher context
*/
gcry_md_hd_t hd;
};
/**
* Implementation of hasher_t.get_hash_size.
*/
static size_t get_hash_size(private_gcrypt_hasher_t *this)
{
return gcry_md_get_algo_dlen(gcry_md_get_algo(this->hd));
}
/**
* Implementation of hasher_t.reset.
*/
static void reset(private_gcrypt_hasher_t *this)
{
gcry_md_reset(this->hd);
}
/**
* Implementation of hasher_t.get_hash.
*/
static void get_hash(private_gcrypt_hasher_t *this, chunk_t chunk,
u_int8_t *hash)
{
gcry_md_write(this->hd, chunk.ptr, chunk.len);
if (hash)
{
memcpy(hash, gcry_md_read(this->hd, 0), get_hash_size(this));
gcry_md_reset(this->hd);
}
}
/**
* Implementation of hasher_t.allocate_hash.
*/
static void allocate_hash(private_gcrypt_hasher_t *this, chunk_t chunk,
chunk_t *hash)
{
if (hash)
{
*hash = chunk_alloc(get_hash_size(this));
get_hash(this, chunk, hash->ptr);
}
else
{
get_hash(this, chunk, NULL);
}
}
/**
* Implementation of hasher_t.destroy.
*/
static void destroy (private_gcrypt_hasher_t *this)
{
gcry_md_close(this->hd);
free(this);
}
/*
* Described in header
*/
gcrypt_hasher_t *gcrypt_hasher_create(hash_algorithm_t algo)
{
private_gcrypt_hasher_t *this;
int gcrypt_alg;
gcry_error_t err;
switch (algo)
{
case HASH_MD2:
gcrypt_alg = GCRY_MD_MD2;
break;
case HASH_MD4:
gcrypt_alg = GCRY_MD_MD4;
break;
case HASH_MD5:
gcrypt_alg = GCRY_MD_MD5;
break;
case HASH_SHA1:
gcrypt_alg = GCRY_MD_SHA1;
break;
case HASH_SHA224:
gcrypt_alg = GCRY_MD_SHA224;
break;
case HASH_SHA256:
gcrypt_alg = GCRY_MD_SHA256;
break;
case HASH_SHA384:
gcrypt_alg = GCRY_MD_SHA384;
break;
case HASH_SHA512:
gcrypt_alg = GCRY_MD_SHA512;
break;
default:
return NULL;
}
this = malloc_thing(private_gcrypt_hasher_t);
err = gcry_md_open(&this->hd, gcrypt_alg, 0);
if (err)
{
DBG1(DBG_LIB, "grcy_md_open(%N) failed: %s",
hash_algorithm_names, algo, gpg_strerror(err));
free(this);
return NULL;
}
this->public.hasher_interface.get_hash = (void (*) (hasher_t*, chunk_t, u_int8_t*))get_hash;
this->public.hasher_interface.allocate_hash = (void (*) (hasher_t*, chunk_t, chunk_t*))allocate_hash;
this->public.hasher_interface.get_hash_size = (size_t (*) (hasher_t*))get_hash_size;
this->public.hasher_interface.reset = (void (*) (hasher_t*))reset;
this->public.hasher_interface.destroy = (void (*) (hasher_t*))destroy;
return &this->public;
}
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