generate-cookie.c

/*
 * Copyright (c) 1995-2019 Peter Simons <simons@cryp.to>
 * Copyright (c) 2000-2001 Cable & Wireless GmbH
 * Copyright (c) 1999-2000 CyberSolutions GmbH
 *
 * 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/>.
 */

#include <config.h>

#include "petidomo.h"
#include "md5.h"
#include <string.h>

static char* encode_digest_to_ascii(unsigned char digest[16])
    {
    int                  i;
    static const char    hex[] = "0123456789ABCDEF";
    char *               buffer;

    buffer = xmalloc(33);
    for (i = 0; i < 16; i++)
        {
        buffer[i+i] = hex[digest[i] >> 4];
        buffer[i+i+1] = hex[digest[i] & 0x0f];
        }

    buffer[i+i] = '\0';
    return buffer;
    }

char* generate_cookie(const char* buffer)
    {
    unsigned char digest[MD5_DIGEST_SIZE];
    md5_buffer(buffer, strlen(buffer), digest);
    return encode_digest_to_ascii(digest);
    }