<?php
//可用于加密解密，如cookie，账号，手机号 as so onclass DES{	var $key;	var $iv; //偏移量		function __construct( $key, $iv=0 ) {	//key长度8例如:1234abcd		$this->key = $key;		if( $iv == 0 ) {			$this->iv = $key; //默认以$key 作为 iv		} else {			$this->iv = $iv; //mcrypt_create_iv ( mcrypt_get_block_size (MCRYPT_DES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM );		}	}		function encrypt($str) {	//加密，返回大写十六进制字符串		$size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );		$str = $this->pkcs5Pad ( $str, $size );		return strtoupper( bin2hex( mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv ) ) );	}		function decrypt($str) {	//解密		$strBin = $this->hex2bin( strtolower( $str ) );		$str = mcrypt_cbc( MCRYPT_DES, $this->key, $strBin, MCRYPT_DECRYPT, $this->iv );		$str = $this->pkcs5Unpad( $str );		return $str;	}		function hex2bin($hexData) {		$binDatahttp://www.mamicode.com/= "";		for($i = 0; $i < strlen ( $hexData ); $i += 2) {			$binData .= chr ( hexdec ( substr ( $hexData, $i, 2 ) ) );		}		return $binData;	}	function pkcs5Pad($text, $blocksize) {		$pad = $blocksize - (strlen ( $text ) % $blocksize);		return $text . str_repeat ( chr ( $pad ), $pad );	}		function pkcs5Unpad($text) {		$pad = ord ( $text {strlen ( $text ) - 1} );		if ($pad > strlen ( $text ))			return false;		if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad)			return false;		return substr ( $text, 0, - 1 * $pad );	}	}// 实例化，并传入两个参数，都为8位,即 KEY, VI的值$des = new DES(‘abcd1234‘, ‘87654321‘);//加密结果 $aa 为 7A3C7BBA8B42ADC4$str = ‘123456‘;$aa = $des->encrypt($str);echo $aa;// 解密结果 $bb 为 123456$bb = $des->decrypt($aa);echo $bb;?>