Summary of examples of AES encryption and decryption in php_PHP tutorial

aesDemo.php:

Example,

Copy code The code is as follows:

require_once('./AES.php');
//$aes = new AES();
$aes = new AES(true);//Storage the encrypted string in hexadecimal format
//$aes = new AES (true,true);//With debugging information and the encrypted string is stored in hexadecimal
$key = "this is a 32 byte key";//Key
$keys = $aes- >makeKey($key);
$encode = "123456";// Encrypted string
$ct = $aes->encryptString($encode, $keys);
echo " encode = ".$ct."
";
$cpt = $aes->decryptString($ct, $keys);
echo "decode = ".$cpt;
? >

Example, AES encryption class

Copy code The code is as follows:

//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;
}

}
//How to use
$aes = new AESMcrypt($bit = 128, $key = 'abcdef1234567890', $iv = '0987654321fedcba', $mode = 'cbc');
$c = $aes->encrypt('haowei.me');
var_dump($aes->decrypt($c));

Example, attached with an encryptable and decryptable class

Copy code The code is as follows:

/**
* AES encryption and decryption classes
* @author hushangming
*
* Usage:
*

<br> * // Instantiation class <br> * // Parameters $_bit: format, supports 256, 192, 128, the default is 128 bytes <br> * // Parameter $_type: encryption/decryption method, supports cfb, cbc, nofb, ofb, stream, ecb, the default is ecb<br> * // Parameter $_key: key, default is abcdefghijuklmno<br> * $tcaes = new TCAES(); <br> * $string = 'laohu';<br> * // Encryption<br> * $ encodeString = $tcaes->encode($string);<br> * // Decrypt<br> * $decodeString = $tcaes->decode($encodeString);<br> * 

*/
class TCAES{
 private $_bit = MCRYPT_RIJNDAEL_256;
 private $_type = MCRYPT_MODE_CBC;
 //private $_key = 'abcdefghijuklmno0123456789012345';
 private $_key = 'abcdefghijuklmno'; // 密钥
 private $_use_base64 = true;
 private $_iv_size = null;
 private $_iv = null;

 /**
* @param string $_key key
* @param int $_bit uses 128 bytes by default
* @param string $_type encryption and decryption method
* @param boolean $_use_base64 uses base64 by default Encryption
*/
 public function __construct($_key = '', $_bit = 128, $_type = 'ecb', $_use_base64 = true){
  // 加密字节
  if(192 === $_bit){
   $this->_bit = MCRYPT_RIJNDAEL_192;
  }elseif(128 === $_bit){
   $this->_bit = MCRYPT_RIJNDAEL_128;
  }else{
   $this->_bit = MCRYPT_RIJNDAEL_256;
  }
  // 加密方法
  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{
   $this->_type = MCRYPT_MODE_ECB;
  }
  // 密钥
  if(!empty($_key)){
   $this->_key = $_key;
  }
  // 是否使用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;
 }

 /**
* Convert $string to hexadecimal
* @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;
 }

 /**
* Convert hexadecimal stream $string to 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;
 }
}

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