php实现的AES加密类定义与用法示例

yuchao

            本文实例讲述了php实现的AES加密类定义与用法。分享给大家供大家参考，具体如下：
CryptAES.class.php文件：
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()
{
$this->pad_method = 'pkcs5';
}
protected function pad_or_unpad($str, $ext)
{
if ( is_null($this->pad_method) )
{
  return $str;
}
else
{
  $func_name = __CLASS__ . '::' . $this->pad_method . '_' . $ext . 'pad';
  if ( is_callable($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, '');
}
protected function unpad($str)
{
return $this->pad_or_unpad($str, 'un');
}
public function encrypt($str)
{
$str = $this->pad($str);
$td = mcrypt_module_open($this->cipher, '', $this->mode, '');
if ( empty($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, '', $this->mode, '');
if ( empty($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 = '';
$length = strlen($hexdata);
for ($i=0; $i  strlen($text)) return false;
if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;
return substr($text, 0, -1 * $pad);
}
}
?>