Detailed explanation of PHP's AES encryption algorithm example

This article mainly introduces PHP's AES encryption algorithm, and analyzes PHP's AES encryption algorithm class and its specific usage in the form of a complete example. It has certain reference value. Friends in need can refer to it

The details are as follows:

<?php
class MCrypt {
  private $hex_iv = &#39;00000000000000000000000000000000&#39;; # converted JAVA byte code in to HEX and placed it here
  private $key = &#39;U1MjU1M0FDOUZ.Qz&#39;; #Same as in JAVA
  function __construct() {
    $this->key = hash(&#39;sha256&#39;, $this->key, true);
    //echo $this->key.&#39;<br/>&#39;;
  }
  function encrypt($str) {
    $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, &#39;&#39;, MCRYPT_MODE_CBC, &#39;&#39;);
    mcrypt_generic_init($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) {
    $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, &#39;&#39;, MCRYPT_MODE_CBC, &#39;&#39;);
    mcrypt_generic_init($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)
  {
    $string=&#39;&#39;;
    for ($i=0; $i < strlen($hex)-1; $i+=2)
    {
      $string .= chr(hexdec($hex[$i].$hex[$i+1]));
    }
    return $string;
  }
}
$encryption = new MCrypt();
echo $encryption->encrypt(&#39;123456&#39;) . "<br/>";
echo $encryption->decrypt(&#39;tpyxISJ83dqEs3uw8bN/+w==&#39;);
?>

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

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