<?php

class DesEdgCbc {
    private $cipher, $key, $iv;

    public function __construct($cipher, $key, $iv){
        $this->cipher = $cipher;
        $this->key = $this->getFormatKey($key);
        $this->iv = $iv;
    }

    /**
     * [加密]
     * @param  [type] $msg [description]
     * @return [string]      [description]
     */
    public function encrypt($msg){
        $des = @openssl_encrypt($msg, $this->cipher, $this->key, OPENSSL_RAW_DATA, $this->iv);
        return base64_encode($des);
    }

    /**
     * 解密
     * @param  [type] $msg [description]
     * @return [string]      [description]
     */
    public function decrypt($msg){
        return @openssl_decrypt(base64_decode($msg), $this->cipher, $this->key, OPENSSL_RAW_DATA, $this->iv);
    }

    public function getFormatKey($skey){
        $md5Value = md5($skey);
        $md5ValueLen = strlen($md5Value);
        $key = $md5Value.substr($md5ValueLen, 0, $md5ValueLen/2);
        return hex2bin($key);//把十六进制值转换为 ASCII 字符
    }
}

$cipher = ‘DES-EDE-CBC‘;
$msg = ‘hello, cyy‘;
$key = ‘123456789‘;
$iv = "\x00\x00\x00\x00\x00\x00\x00\x00";
$des = new DesEdgCbc($cipher, $key, $iv);
//加密
$msg = $des->encrypt($msg);
echo ‘加密后：‘.$msg.‘<br/>‘;
//解密
$src = $des->decrypt($msg);
echo ‘解密后：‘.$src.‘<br/>‘;