-
- class Crypt3Des
- {
- private $key = "";
- private $iv = "";
- /**
- * 构造，传递二个已经进行base64_encode的KEY与IV
- *
- * @param string $key
- * @param string $iv
- */
- function __construct ($key, $iv)
- {
- if (empty($key) || empty($iv)) {
- echo 'key and iv is not valid';
- exit();
- }
- $this->key = $key;
- $this->iv = $iv;
- }
- /**
- *加密
- * @param $value
- * @return
- */
- public function encrypt ($value)
- {
- $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');
- $iv = base64_decode($this->iv);
- $value = $this->PaddingPKCS7($value);
- $key = base64_decode($this->key);
- 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
- * @param $value
- * @return
- */
- public function decrypt ($value)
- {
- $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');
- $iv = base64_decode($this->iv);
- $key = base64_decode($this->key);
- mcrypt_generic_init($td, $key, $iv);
- $ret = trim(mdecrypt_generic($td, base64_decode($value)));
- $ret = $this->UnPaddingPKCS7($ret);
- mcrypt_generic_deinit($td);
- mcrypt_module_close($td);
- return $ret;
- }
- private function PaddingPKCS7 ($data)
- {
- $block_size = mcrypt_get_block_size('tripledes', 'cbc');
- $padding_char = $block_size - (strlen($data) % $block_size);
- $data .= str_repeat(chr($padding_char), $padding_char);
- return $data;
- }
- private function UnPaddingPKCS7 ($text)
- {
- $pad = ord($text{strlen($text) - 1});
- if ($pad > strlen($text)) {
- return false;
- }
- if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {
- return false;
- }
- return substr($text, 0, - 1 * $pad);
- }
- }
- ?>
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