php mcrypt加密实例

<?php
//当前mcrypt支持的加密模型
$modes_list = mcrypt_list_modes();
// Array
// (
//         [0] => cbc
//         [1] => cfb
//         [2] => ctr
//         [3] => ecb
//         [4] => ncfb
//         [5] => nofb
//         [6] => ofb
//         [7] => stream
// )
//当前mcrypt支持的算法
$algorithms_list = mcrypt_list_algorithms();
// Array
// (
//         [0] => cast-128
//         [1] => gost
//         [2] => rijndael-128
//         [3] => twofish
//         [4] => cast-256
//         [5] => loki97
//         [6] => rijndael-192
//         [7] => saferplus
//         [8] => wake
//         [9] => blowfish-compat
//         [10] => des
//         [11] => rijndael-256
//         [12] => serpent
//         [13] => xtea
//         [14] => blowfish
//         [15] => enigma
//         [16] => rc2
//         [17] => tripledes
//         [18] => arcfour
// )
$key = "this is secret key";
$input = "Let us meet at 9 o'clock at the secret place";

//加密过程
$td = mcrypt_module_open('tripledes','','ecb','');//设置加密模式和算法
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td),MCRYPT_RAND);// 创建iv(初始化向量)
mcrypt_generic_init($td,$key,$iv);// 根据密钥和iv初始化$td,完成内存分配等初始化工作
$encrypted_data = mcrypt_generic($td,$input);// 进行加密
mcrypt_generic_deinit($td);// 反初始化$td,释放资源
mcrypt_module_close($td);

//解密过程
$td = mcrypt_module_open('tripledes','','ecb','');
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td),MCRYPT_RAND);
mcrypt_generic_init($td,$key,$iv);
$decrypted_data = mdecrypt_generic($td,$encrypted_data);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);

/**
 * 一个简单功能的加密解密类
 * @author LHL　2016.08.03
 */
class Mcrypt
{
    /**
     * 获取key
     */
    private static function getKey(){
        return md5('exampleKey');
    }
    /**
     * 加密方法
     */    
    public static function encrypt($value){
        $td = mcrypt_module_open('tripledes','','ecb','');
        $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td),MCRYPT_DEV_RANDOM);
        $key = substr(self::getKey(),0,mcrypt_enc_get_key_size($td));
        mcrypt_generic_init($td,$key,$iv);
        $ret = base64_encode(mcrypt_generic($td,$value));
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        return $ret;
    }
    /**
     * 解密方法
     */
    public static function dencrypt($value){
        $td = mcrypt_module_open('tripledes','','ecb','');
        $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td),MCRYPT_DEV_RANDOM);
        $key = substr(self::getKey(), 0, mcrypt_enc_get_key_size($td));
        mcrypt_generic_init($td, $key, $iv);
        $ret = trim(mdecrypt_generic($td, base64_decode($value))) ;
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        return $ret;
    }
}
$sec = Mcrypt::encrypt('abc');
echo Mcrypt::dencrypt($sec);