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scdtools/src/scdrand.c

460 lines
12 KiB
C

/*
* scdrand - Extract random numbers from a smart card
* Copyright (C) 2014 Damien Goutte-Gattat
*
* 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 3 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 <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
else
snprintf(command, sizeof(command), "RANDOM %d", len);
c.len = len;
c.data = buffer;
if ( (ge = assuan_transact(ctx, command, get_challenge_data_cb, &c,
NULL, NULL, NULL, NULL)) )
errx(EXIT_FAILURE, "Cannot get challenge from card: %s",
gpg_strerror(ge));
return c.len;
}
if ( n == -1 )
#ifndef GPG_ERR_INITIALIZED