389-ds-base/ldap/servers/plugins/pwdstorage/pwd_util.c

/** BEGIN COPYRIGHT BLOCK
 * 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; version 2 of the License.
 * 
 * This Program is distributed in the hope that it will be useful, but WITHOUT
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 * 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, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA.
 * 
 * In addition, as a special exception, Red Hat, Inc. gives You the additional
 * right to link the code of this Program with code not covered under the GNU
 * General Public License ("Non-GPL Code") and to distribute linked combinations
 * including the two, subject to the limitations in this paragraph. Non-GPL Code
 * permitted under this exception must only link to the code of this Program
 * through those well defined interfaces identified in the file named EXCEPTION
 * found in the source code files (the "Approved Interfaces"). The files of
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 * in conjunction with the Program except the Non-GPL Code covered by this
 * exception. If you modify this file, you may extend this exception to your
 * version of the file, but you are not obligated to do so. If you do not wish to
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 * Copyright (C) 2009 Red Hat, Inc.
 * All rights reserved.
 * END COPYRIGHT BLOCK **/

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include <string.h>
#include "pwdstorage.h"

/*
 * Utility functions for the Password Storage Scheme plugins.
 */

/*
 * calculate the number of bytes the base64 encoded encval
 * will have when decoded, taking into account padding
 */
PRUint32
pwdstorage_base64_decode_len(const char *encval, PRUint32 enclen)
{
    PRUint32 len = enclen;

    if (len == 0) {
        len = strlen(encval);
    }
    if (len && (0 == (len & 3))) {
        if('=' == encval[len - 1]) {
            if('=' == encval[len - 2]) {
                len -= 2;
            } else {
                len -= 1;
            }
        }
    }

    return ((len * 3) / 4);
}