PHP的AES加密算法完整實例

    本文實例講述了PHP的AES加密算法。分享給大家供大家參考，具體如下：
    <?php
    class MCrypt {
      private $hex_iv = '00000000000000000000000000000000'; # converted JAVA byte code in to HEX and placed it here
      private $key = 'U1MjU1M0FDOUZ.Qz'; #Same as in JAVA
      function __construct() {
        $this->key = hash('sha256', $this->key, true);
        //echo $this->key.'<br/>';
      }
      function encrypt($str) {
        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
        mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));
        $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
        $pad = $block - (strlen($str) % $block);
        $str .= str_repeat(chr($pad), $pad);
        $encrypted = mcrypt_generic($td, $str);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        return base64_encode($encrypted);
      }
      function decrypt($code) {
        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
        mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));
        $str = mdecrypt_generic($td, base64_decode($code));
        $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        return $this->strippadding($str);
      }
      /*
       For PKCS7 padding
       */
      private function addpadding($string, $blocksize = 16) {
        $len = strlen($string);
        $pad = $blocksize - ($len % $blocksize);
        $string .= str_repeat(chr($pad), $pad);
        return $string;
      }
      private function strippadding($string) {
        $slast = ord(substr($string, -1));
        $slastc = chr($slast);
        $pcheck = substr($string, -$slast);
        if (preg_match("/$slastc{" . $slast . "}/", $string)) {
          $string = substr($string, 0, strlen($string) - $slast);
          return $string;
        } else {
          return false;
        }
      }
      function hexToStr($hex)
      {
        $string='';
        for ($i=0; $i < strlen($hex)-1; $i+=2)
        {
          $string .= chr(hexdec($hex[$i].$hex[$i+1]));
        }
        return $string;
      }
    }
    $encryption = new MCrypt();
    echo $encryption->encrypt('123456') . "<br/>";
    echo $encryption->decrypt('tpyxISJ83dqEs3uw8bN/+w==');
    ?>
    希望本文所述對大家PHP程序設(shè)計有所幫助。