<?php
// $Header: /cvsroot/phpldapadmin/phpldapadmin/lib/emuhash_functions.php,v 1.6.10.2 2008/12/12 12:20:23 wurley Exp $

/*******************************************************************************
 * emuhash - partly emulates the php mhash functions
 * version: 2004040701
 *
 * (c) 2004 - Simon Matter <simon.matter@invoca.ch>
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 ******************************************************************************/

/******************************************************************************/
/* Do we have builtin mhash support in this PHP version ?                     */
/******************************************************************************/

if( ! function_exists( 'mhash' ) && ! function_exists( 'mhash_keygen_s2k' ) ) {
	if( ! isset( $emuhash_openssl ) )
		$emuhash_openssl = '/usr/bin/openssl';

	// don't create mhash functions if we don't have a working openssl
	if( ! file_exists( $emuhash_openssl ) )
		unset( $emuhash_openssl );

	elseif ( function_exists( 'is_executable' ) && ! is_executable( $emuhash_openssl ) )
		unset( $emuhash_openssl );

	else {

		if( ! isset( $emuhash_temp_dir ) )
			$emuhash_temp_dir = '/tmp';

/******************************************************************************/
/* Define constants used in the mhash emulation code.                         */
/******************************************************************************/

		define('MHASH_MD5', 'md5');
		define('MHASH_SHA1', 'sha1');
		define('MHASH_RIPEMD160', 'rmd160');

/******************************************************************************/
/* Functions to emulate parts of php-mash.                                    */
/******************************************************************************/

		function openssl_hash( $openssl_hash_id, $password_clear ) {
			global $emuhash_openssl, $emuhash_temp_dir;

			$current_magic_quotes = get_magic_quotes_runtime();
			set_magic_quotes_runtime( 0 );
			$tmpfile = tempnam( $emuhash_temp_dir, "emuhash" );
			$pwhandle = fopen( $tmpfile, "w" );

			if( ! $pwhandle )
				error(sprintf('Unable to create a temporary file %s to create hashed password',$tmpfile) ,'error','index.php');

			fwrite( $pwhandle, $password_clear );
			fclose( $pwhandle );
			$cmd = $emuhash_openssl . ' ' . $openssl_hash_id . ' -binary < ' . $tmpfile;
			$prog = popen( $cmd, "r" );
			$pass = fread( $prog, 1024 );
			pclose( $prog );
			unlink( $tmpfile );
			set_magic_quotes_runtime( $current_magic_quotes );

			return $pass;
		}

		function mhash( $hash_id, $password_clear ) {
			switch( $hash_id ) {
				case MHASH_MD5:
					$emuhash = openssl_hash( MHASH_MD5, $password_clear );
					break;

				case MHASH_SHA1:
					$emuhash = openssl_hash( MHASH_SHA1, $password_clear );
					break;

				case MHASH_RIPEMD160:
					$emuhash = openssl_hash( MHASH_RIPEMD160, $password_clear );
					break;

				default:
					$emuhash = FALSE;
			}

			return $emuhash;
		}

		function mhash_keygen_s2k( $hash_id, $password_clear, $salt, $bytes ) {
			return substr(pack("H*", bin2hex(mhash($hash_id, ($salt . $password_clear)))), 0, $bytes);
		}

/******************************************************************************/

	}

}
?>
