scdtools/src/scdrand.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