95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
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/* hash-common.c - Common code for hash algorithms
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* Copyright (C) 2008 Free Software Foundation, Inc.
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*
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* This file is part of Libgcrypt.
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*
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* Libgcrypt is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* 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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* Libgcrypt is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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
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* License along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_STDINT_H
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# include <stdint.h>
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#endif
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#include "g10lib.h"
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#include "hash-common.h"
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/* Run a selftest for hash algorithm ALGO. If the resulting digest
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matches EXPECT/EXPECTLEN and everything else is fine as well,
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return NULL. If an error occurs, return a static text string
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describing the error.
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DATAMODE controls what will be hashed according to this table:
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0 - Hash the supplied DATA of DATALEN.
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1 - Hash one million times a 'a'. DATA and DATALEN are ignored.
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*/
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const char *
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_gcry_hash_selftest_check_one (int algo,
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int datamode, const void *data, size_t datalen,
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const void *expect, size_t expectlen)
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{
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const char *result = NULL;
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gcry_error_t err = 0;
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gcry_md_hd_t hd;
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unsigned char *digest;
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if (_gcry_md_get_algo_dlen (algo) != expectlen)
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return "digest size does not match expected size";
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err = _gcry_md_open (&hd, algo, 0);
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if (err)
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return "gcry_md_open failed";
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switch (datamode)
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{
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case 0:
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_gcry_md_write (hd, data, datalen);
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break;
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case 1: /* Hash one million times an "a". */
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{
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char aaa[1000];
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int i;
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/* Write in odd size chunks so that we test the buffering. */
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memset (aaa, 'a', 1000);
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for (i = 0; i < 1000; i++)
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_gcry_md_write (hd, aaa, 1000);
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}
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break;
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default:
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result = "invalid DATAMODE";
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}
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if (!result)
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{
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digest = _gcry_md_read (hd, algo);
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if ( memcmp (digest, expect, expectlen) )
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result = "digest mismatch";
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}
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_gcry_md_close (hd);
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return result;
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}
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