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<?php
namespace app\utility;
class DesEn
{
const OUTPUT_NULL = '';
const OUTPUT_BASE64 = 'base64';
const OUTPUT_HEX = 'hex';
/**
* @var string $method 加解密方法,可通过 openssl_get_cipher_methods() 获得
*/
protected $method;
/**
* @var string $key 加解密的密钥
*/
protected $key;
/**
* @var string $output 输出格式 无、base64、hex
*/
protected $output;
/**
* @var string $iv 加解密的向量
*/
protected $iv;
/**
* @var string $options
*/
protected $options;
/**
* DES constructor.
* @param string $key
* @param string $method
* ECB: DES-ECB、DES-EDE3 (为 ECB 模式时,$iv 为空即可)
* CBC: DES-CBC、DES-EDE3-CBC、DESX-CBC
* CFB: DES-CFB8、DES-EDE3-CFB8
* CTR
* OFB
*
* @param string $output
* base64、hex
*
* @param string $iv
* @param int $options
*/
public function __construct($key, $method = 'DES-ECB', $output = self::OUTPUT_NULL, $iv = '', $options = OPENSSL_RAW_DATA | OPENSSL_NO_PADDING)
{
$this->key = $key;
$this->method = $method;
$this->output = $output;
$this->iv = $iv;
$this->options = $options;
}
/**
* 加密
*
* @param $str
* @return string
*/
public function encrypt($str)
{
$str = $this->padding($str, 8);
$sign = openssl_encrypt($str, $this->method, $this->key, $this->options, $this->iv);
if ($this->output == self::OUTPUT_BASE64) {
$sign = base64_encode($sign);
} else if ($this->output == self::OUTPUT_HEX) {
$sign = bin2hex($sign);
}
return $sign;
}
/**
* 填充
*
* @param $str
* @param $blockSize
* @return string
* @internal param $blocksize
*/
private function padding($str, $blockSize)
{
$pad = $blockSize - (strlen($str) % $blockSize);
return $str . str_repeat(chr($pad), $pad);
}
/**
* 解密
*
* @param $encrypted
* @return string
*/
public function decrypt($encrypted)
{
if ($this->output == self::OUTPUT_BASE64) {
$encrypted = base64_decode($encrypted);
} else if ($this->output == self::OUTPUT_HEX) {
$encrypted = hex2bin($encrypted);
}
$sign = @openssl_decrypt($encrypted, $this->method, $this->key, $this->options, $this->iv);
$sign = $this->unPadding($sign);
$sign = rtrim($sign);
return $sign;
}
/**
* 去填充
*
* @param $str
* @return string
*/
private function unPadding($str)
{
$pad = ord($str[strlen($str) - 1]);
if ($pad > strlen($str)) {
return false;
}
return substr($str, 0, -1 * $pad);
}
}