PHP implements AES encryption class definition and usage

This article mainly introduces the definition and usage of the AES encryption class implemented in PHP. It analyzes the implementation and usage of the AES encryption class based on PHP in the form of a complete example. Friends in need can refer to it. I hope it can help everyone.

CryptAES.class.php file:

<?php
class CryptAES
{
 protected $cipher = MCRYPT_RIJNDAEL_128;
 protected $mode = MCRYPT_MODE_ECB;
 protected $pad_method = NULL;
 protected $secret_key = &#39;&#39;;
 protected $iv = &#39;&#39;;
 public function set_cipher($cipher)
 {
 $this->cipher = $cipher;
 }
 public function set_mode($mode)
 {
 $this->mode = $mode;
 }
 public function set_iv($iv)
 {
 $this->iv = $iv;
 }
 public function set_key($key)
 {
 $this->secret_key = $key;
 }
 public function require_pkcs5()
 {
 $this->pad_method = &#39;pkcs5&#39;;
 }
 protected function pad_or_unpad($str, $ext)
 {
 if ( is_null($this->pad_method) )
 {
  return $str;
 }
 else
 {
  $func_name = __CLASS__ . &#39;::&#39; . $this->pad_method . &#39;_&#39; . $ext . &#39;pad&#39;;
  if ( is_callable($func_name) )
  {
  $size = mcrypt_get_block_size($this->cipher, $this->mode);
  return call_user_func($func_name, $str, $size);
  }
 }
 return $str;
 }
 protected function pad($str)
 {
 return $this->pad_or_unpad($str, &#39;&#39;);
 }
 protected function unpad($str)
 {
 return $this->pad_or_unpad($str, &#39;un&#39;);
 }
 public function encrypt($str)
 {
 $str = $this->pad($str);
 $td = mcrypt_module_open($this->cipher, &#39;&#39;, $this->mode, &#39;&#39;);
 if ( empty($this->iv) )
 {
  $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
 }
 else
 {
  $iv = $this->iv;
 }
 mcrypt_generic_init($td, $this->secret_key, $iv);
 $cyper_text = mcrypt_generic($td, $str);
 //$rt=base64_encode($cyper_text);
 $rt = bin2hex($cyper_text);
 mcrypt_generic_deinit($td);
 mcrypt_module_close($td);
 return $rt;
 }
 public function decrypt($str){
 $td = mcrypt_module_open($this->cipher, &#39;&#39;, $this->mode, &#39;&#39;);
 if ( empty($this->iv) )
 {
  $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
 }
 else
 {
  $iv = $this->iv;
 }
 mcrypt_generic_init($td, $this->secret_key, $iv);
 $decrypted_text = mdecrypt_generic($td, self::hex2bin($str));
 //$decrypted_text = mdecrypt_generic($td, base64_decode($str));
 $rt = $decrypted_text;
 mcrypt_generic_deinit($td);
 mcrypt_module_close($td);
 return $this->unpad($rt);
 }
 public static function hex2bin($hexdata) {
 $bindata = &#39;&#39;;
 $length = strlen($hexdata);
 for ($i=0; $i < $length; $i += 2)
 {
  $bindata .= chr(hexdec(substr($hexdata, $i, 2)));
 }
 return $bindata;
 }
 public static function pkcs5_pad($text, $blocksize)
 {
 $pad = $blocksize - (strlen($text) % $blocksize);
 return $text . str_repeat(chr($pad), $pad);
 }
 public static function pkcs5_unpad($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);
 }
}
?>

Usage:

require_once("CryptAES.class.php");
$keyStr = 'ss4fs4skfhksk';
$aes = new CryptAES();
$keyStr = $aes->hex2bin($keyStr);
$aes->set_key($keyStr);
$aes->require_pkcs5();
$d = $aes->encrypt($data);

Note: This needs to be enabled in php.ini: extension=php_mcrypt.dll

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aes encryption class implemented by php

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