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/*
* Copyright (C) 2001-2012 Free Software Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* 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 program. If not, see <https://www.gnu.org/licenses/>
*
*/
#include "gnutls_int.h"
#include "auth/srp_kx.h"
#include "auth/anon.h"
#include "auth/cert.h"
#include "auth/psk.h"
#include "errors.h"
#include "auth.h"
#include "state.h"
#include "datum.h"
#include "algorithms.h"
/**
* gnutls_fingerprint:
* @algo: is a digest algorithm
* @data: is the data
* @result: is the place where the result will be copied (may be null).
* @result_size: should hold the size of the result. The actual size
* of the returned result will also be copied there.
*
* This function will calculate a fingerprint (actually a hash), of
* the given data. The result is not printable data. You should
* convert it to hex, or to something else printable.
*
* This is the usual way to calculate a fingerprint of an X.509 DER
* encoded certificate. Note however that the fingerprint of an
* OpenPGP certificate is not just a hash and cannot be calculated with this
* function.
*
* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise
* an error code is returned.
**/
int gnutls_fingerprint(gnutls_digest_algorithm_t algo,
const gnutls_datum_t *data, void *result,
size_t *result_size)
{
int ret;
int hash_len = _gnutls_hash_get_algo_len(hash_to_entry(algo));
if (hash_len < 0 || (unsigned)hash_len > *result_size ||
result == NULL) {
*result_size = hash_len;
return GNUTLS_E_SHORT_MEMORY_BUFFER;
}
*result_size = hash_len;
if (result) {
ret = _gnutls_hash_fast(algo, data->data, data->size, result);
if (ret < 0)
return gnutls_assert_val(ret);
}
return 0;
}
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