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| class DES {
protected $method;
protected $key;
protected $output;
protected $iv;
protected $options;
const OUTPUT_NULL = '';
const OUTPUT_BASE64 = 'base64';
const OUTPUT_HEX = 'hex';
public function __construct($key, $method = 'DES-ECB', $output = '', $iv = '', $options = OPENSSL_RAW_DATA | OPENSSL_NO_PADDING) {
$this->key = $key;
$this->method = $method;
$this->output = $output;
$this->iv = $iv;
$this->options = $options;
}
public function encrypt($str) {
$str = $this->pkcsPadding($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 $sign;
}
public function decrypt($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 = $this->unPkcsPadding($sign);
return rtrim($sign);
}
private function pkcsPadding($str, $blocksize) {
$pad = $blocksize - (strlen($str) % $blocksize);
return $str . str_repeat(chr($pad), $pad);
}
private function unPkcsPadding($str) {
$pad = ord($str[strlen($str) - 1]);
if ($pad > strlen($str)) {
return false;
}
return substr($str, 0, -1 * $pad);
}
}
|