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/*
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* Copyright (C) 2001-2012 Free Software Foundation, Inc.
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*
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* Author: Nikos Mavrogiannopoulos
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*
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* This file is part of GnuTLS.
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*
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* The GnuTLS is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser 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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*/
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#include "gnutls_int.h"
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#include <auth/srp_kx.h>
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#include <auth/anon.h>
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#include <auth/cert.h>
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#include <auth/psk.h>
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#include "errors.h"
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#include <auth.h>
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#include <state.h>
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#include <datum.h>
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#include <algorithms.h>
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/**
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* gnutls_fingerprint:
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* @algo: is a digest algorithm
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* @data: is the data
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* @result: is the place where the result will be copied (may be null).
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* @result_size: should hold the size of the result. The actual size
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* of the returned result will also be copied there.
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*
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* This function will calculate a fingerprint (actually a hash), of
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* the given data. The result is not printable data. You should
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* convert it to hex, or to something else printable.
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*
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* This is the usual way to calculate a fingerprint of an X.509 DER
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* encoded certificate. Note however that the fingerprint of an
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* OpenPGP certificate is not just a hash and cannot be calculated with this
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* function.
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*
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* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise
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* an error code is returned.
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**/
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int
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gnutls_fingerprint(gnutls_digest_algorithm_t algo,
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const gnutls_datum_t * data, void *result,
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size_t * result_size)
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{
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int ret;
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int hash_len = _gnutls_hash_get_algo_len(hash_to_entry(algo));
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if (hash_len < 0 || (unsigned) hash_len > *result_size
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|| result == NULL) {
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*result_size = hash_len;
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return GNUTLS_E_SHORT_MEMORY_BUFFER;
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}
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*result_size = hash_len;
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if (result) {
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ret =
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_gnutls_hash_fast(algo, data->data, data->size,
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result);
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if (ret < 0)
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return gnutls_assert_val(ret);
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}
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return 0;
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}
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