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==');
?>

PS：關於加密解密感興趣的朋友還可以參考本站在線工具：

密碼安全性在線檢測：
http://tools.jb51.net/password/my_password_safe

高強度密碼生成器：
http://tools.jb51.net/password/CreateStrongPassword

MD5在線加密工具：
http://tools.jb51.net/password/CreateMD5Password

迅雷、快車、旋風URL加密/解密工具：
http://tools.jb51.net/password/urlrethunder

在線散列/哈希算法加密工具：
http://tools.jb51.net/password/hash_encrypt

更多關於PHP相關內容感興趣的讀者可查看本站專題：《php加密方法總結》、《PHP編碼與轉碼操作技巧匯總》、《php面向對象程序設計入門教程》、《PHP數學運算技巧總結》、《PHP數組(Array)操作技巧大全》、《php字符串(string)用法總結》、《PHP數據結構與算法教程》、《php程序設計算法總結》、《php正則表達式用法總結》、及《php常見數據庫操作技巧匯總》

希望本文所述對大家PHP程序設計有所幫助。