PHP相关系列 - 兼容JAVA的PHP加密解密DES算法

/**
* 加密
* @param string $str 字符串
* @param string $key 密钥
*/
public static function encrypt($str, $key)  {
$block = mcrypt_get_block_size('des', 'ecb');
$pad = $block - (strlen($str) % $block);
$str .= str_repeat(chr($pad), $pad);
$str = mcrypt_encrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);
return base64_encode($str);
}

/**
* 解密
* @param string $str 字符串
* @param string $key 密钥
*/
public static function decrypt($str, $key) {
$str = base64_decode($str);
$str = mcrypt_decrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);
$block = mcrypt_get_block_size('des', 'ecb');
$pad = ord($str[($len = strlen($str)) - 1]);
return substr($str, 0, strlen($str) - $pad);
}