php实现对称加密算法DESede

不清楚DES算法的可以看维基百科

<?php

class DESede{

/**

     * 加密

     * @param $data 待加密明文

     * @param $key DES私钥

     * @param $use3des 是否启用3DES加密，默认不启用

     */

    function encrypt($data=‘‘, $key=‘‘, $use3des = False)

    {

        if (empty($data) || empty($key))

        {

            return False;

        }
$cipher = $use3des ? MCRYPT_TRIPLEDES : MCRYPT_DES;

        $modes = MCRYPT_MODE_ECB;
# Add PKCS7 padding.

        $block = mcrypt_get_block_size($cipher, $modes);

        $pad = $block - (strlen($data) % $block);

        $data .= str_repeat(chr($pad), $pad);
$iv = mcrypt_create_iv(mcrypt_get_iv_size($cipher, $modes), MCRYPT_RAND);

        $encrypted = @mcrypt_encrypt($cipher, $key, $data, $modes, $iv);
return $encrypted;

    }
/**

     * 解密

     * @param $data 待解密密文

     * @param $key DES私钥

     * @param $use3des 是否启用3DES加密，默认不启用

     */

    function decrypt($data=‘‘, $key=‘‘, $use3des = False)

    {

        if (empty($data) || empty($key))

        {

            return False;

        }
$cipher = $use3des ? MCRYPT_TRIPLEDES : MCRYPT_DES;

        $modes = MCRYPT_MODE_ECB;
$iv = mcrypt_create_iv(mcrypt_get_iv_size($cipher, $modes), MCRYPT_RAND);

        $data = @mcrypt_decrypt($cipher, $key, $data, $modes, $iv);
# Strip padding out.

        $block = mcrypt_get_block_size($cipher, $modes);

        $pad = ord($data[($len = strlen($data)) - 1]);

        $decrypted = substr($data, 0, strlen($data) - $pad);
return $decrypted;

    }
}

php实现对称加密算法DESede