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/* Verify a passphrase.
Copyright (C) 1991-2023 Free Software Foundation, Inc.
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.
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.
You should have received a copy of the GNU General Public License
along with this program; if not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <crypt.h>
/* @samp{GNU's Not Unix} hashed using SHA-256, MD5, and DES. */
static const char hash_sha[] =
"$5$DQ2z5NHf1jNJnChB$kV3ZTR0aUaosujPhLzR84Llo3BsspNSe4/tsp7VoEn6";
static const char hash_md5[] = "$1$A3TxDv41$rtXVTUXl2LkeSV0UU5xxs1";
static const char hash_des[] = "FgkTuF98w5DaI";
int
main(void)
{
char *phrase;
int status = 0;
/* Prompt for a passphrase. */
phrase = getpass ("Enter passphrase: ");
/* Compare against the stored hashes. Any input that begins with
@samp{GNU's No} will match the DES hash, but the other two will
only match @samp{GNU's Not Unix}. */
if (strcmp (crypt (phrase, hash_sha), hash_sha))
{
puts ("SHA: not ok");
status = 1;
}
else
puts ("SHA: ok");
if (strcmp (crypt (phrase, hash_md5), hash_md5))
{
puts ("MD5: not ok");
status = 1;
}
else
puts ("MD5: ok");
if (strcmp (crypt (phrase, hash_des), hash_des))
{
puts ("DES: not ok");
status = 1;
}
else
puts ("DES: ok");
return status;
}
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