Summary of AES encryption and decryption examples in php

aesDemo. php:

Example,

<?php
require_once('./AES.php');
//$aes = new AES();
$aes = new AES(true);//  Press the encrypted string 106 The base system is stored 
//$aes = new AES(true,true);//  Encrypted string press with debug information 106 Hexadecimal storage 
$key = "this is a 32 byte key";//  The key 
$keys = $aes->makeKey($key);
$encode = "123456";//  The encrypted string 
$ct = $aes->encryptString($encode, $keys);
echo "encode = ".$ct."<br>";
$cpt = $aes->decryptString($ct, $keys);
echo "decode = ".$cpt;
?>

Example, AES encryption class

<?php
//php aes Encryption class 
class AESMcrypt {
public $iv = null;
public $key = null;
public $bit = 128;
private $cipher;
public function __construct($bit, $key, $iv, $mode) {
if(empty($bit) || empty($key) || empty($iv) || empty($mode))
return NULL;
$this->bit = $bit;
$this->key = $key;
$this->iv = $iv;
$this->mode = $mode;
switch($this->bit) {
case 192:$this->cipher = MCRYPT_RIJNDAEL_192; break;
case 256:$this->cipher = MCRYPT_RIJNDAEL_256; break;
default: $this->cipher = MCRYPT_RIJNDAEL_128;
} 
switch($this->mode) {
case 'ecb':$this->mode = MCRYPT_MODE_ECB; break;
case 'cfb':$this->mode = MCRYPT_MODE_CFB; break;
case 'ofb':$this->mode = MCRYPT_MODE_OFB; break;
case 'nofb':$this->mode = MCRYPT_MODE_NOFB; break;
default: $this->mode = MCRYPT_MODE_CBC;
}
}
public function encrypt($data) {
$data = base64_encode(mcrypt_encrypt( $this->cipher, $this->key, $data, $this->mode, $this->iv));
return $data;
}
public function decrypt($data) {
$data = mcrypt_decrypt( $this->cipher, $this->key, base64_decode($data), $this->mode, $this->iv);
$data = rtrim(rtrim($data), "..");
return $data;
}
}
// Method of use 
$aes = new AESMcrypt($bit = 128, $key = 'abcdef1234567890', $iv = '0987654321fedcba', $mode = 'cbc');
$c = $aes->encrypt('haowei.me');
var_dump($aes->decrypt($c));

Example, with a class can encrypt and decrypt

<?PHP
/**
 * AES Encrypt and decrypt classes 
 * @author hushangming
 * 
 *  Usage: 
 * <pre>
 * //  Instantiate the class 
 * //  parameter $_bit : Format, support 256 , 192 , 128 By default, 128 Bytes of 
 * //  parameter $_type Encryption: / Decryption mode, supported cfb , cbc , nofb , ofb , stream , ecb By default, ecb
 * //  parameter $_key : Key, default is abcdefghijuklmno
 * $tcaes = new TCAES(); 
 * $string = 'laohu';
 * //  encryption 
 * $encodeString = $tcaes->encode($string);
 * //  decryption 
 * $decodeString = $tcaes->decode($encodeString);
 * </pre>
 */
class TCAES{
 private $_bit = MCRYPT_RIJNDAEL_256;
 private $_type = MCRYPT_MODE_CBC;
 //private $_key = 'abcdefghijuklmno0123456789012345';
 private $_key = 'abcdefghijuklmno'; //  The key 
 private $_use_base64 = true;
 private $_iv_size = null;
 private $_iv = null;

 /**
  * @param string $_key  The key 
  * @param int $_bit  Use the default 128 byte 
  * @param string $_type  Encryption and Decryption Mode 
  * @param boolean $_use_base64  Use the default base642 Time encryption 
  */
 public function __construct($_key = '', $_bit = 128, $_type = 'ecb', $_use_base64 = true){
  //  Encrypted byte 
  if(192 === $_bit){
   $this->_bit = MCRYPT_RIJNDAEL_192;
  }elseif(128 === $_bit){
   $this->_bit = MCRYPT_RIJNDAEL_128;
  }else{
   $this->_bit = MCRYPT_RIJNDAEL_256;
  }
  //  Encryption methods 
  if('cfb' === $_type){
   $this->_type = MCRYPT_MODE_CFB;
  }elseif('cbc' === $_type){
   $this->_type = MCRYPT_MODE_CBC;
  }elseif('nofb' === $_type){
   $this->_type = MCRYPT_MODE_NOFB;
  }elseif('ofb' === $_type){
   $this->_type = MCRYPT_MODE_OFB;
  }elseif('stream' === $_type){
   $this->_type = MCRYPT_MODE_STREAM;
  }else{
   $this->_type = MCRYPT_MODE_ECB;
  }
  //  The key 
  if(!empty($_key)){
   $this->_key = $_key;
  }
  //  Whether to use base64
  $this->_use_base64 = $_use_base64;

  $this->_iv_size = mcrypt_get_iv_size($this->_bit, $this->_type);
  $this->_iv = mcrypt_create_iv($this->_iv_size, MCRYPT_RAND);
 }

 /**
  *  encryption 
  * @param string $string  String to be encrypted 
  * @return string
  */
 public function encode($string){
  if(MCRYPT_MODE_ECB === $this->_type){
   $encodeString = mcrypt_encrypt($this->_bit, $this->_key, $string, $this->_type); 
  }else{
   $encodeString = mcrypt_encrypt($this->_bit, $this->_key, $string, $this->_type, $this->_iv);
  }
  if($this->_use_base64)
   $encodeString = base64_encode($encodeString);
  return $encodeString;
 }

 /**
  *  decryption 
  * @param string $string  String to be decrypted 
  * @return string
  */
 public function decode($string){
  if($this->_use_base64)
   $string = base64_decode($string);

  $string = $this->toHexString($string);
  if(MCRYPT_MODE_ECB === $this->_type){
   $decodeString = mcrypt_decrypt($this->_bit, $this->_key, $string, $this->_type);
  }else{
   $decodeString = mcrypt_decrypt($this->_bit, $this->_key, $string, $this->_type, $this->_iv);
  }
  return $decodeString;
 }

 /**
  *  will $string Converted to 106 Into the system 
  * @param string $string
  * @return stream
  */
 private function toHexString ($string){
  $buf = "";
  for ($i = 0; $i < strlen($string); $i++){
   $val = dechex(ord($string{$i}));
   if(strlen($val)< 2)
    $val = "0".$val;
   $buf .= $val;
  }
  return $buf;
 }

 /**
  *  will 106 Base flow $string Convert to a string 
  * @param stream $string
  * @return string
  */
 private function fromHexString($string){
  $buf = "";
  for($i = 0; $i < strlen($string); $i += 2){
   $val = chr(hexdec(substr($string, $i, 2)));
   $buf .= $val;
  }
  return $buf;
 }
}