php 암호화 (특정키를 사용해서 인코딩, 디코딩)

 

Aes.php

class Aes{
	const M_CBC = 'cbc';
	const M_CFB = 'cfb';
	const M_ECB = 'ecb';
	const M_NOFB = 'nofb';
	const M_OFB = 'ofb';
	const M_STREAM = 'stream';
  
	protected $key;
	protected $cipher;
	protected $data;
	protected $mode;
	protected $IV;
/**
* 
* @param type $data
* @param type $key
* @param type $blockSize
* @param type $mode
*/
	function __construct($data = null, $key = null, $blockSize = null, $mode = null) 
	{
		$this->setData($data);
		$this->setKey($key);
		$this->setBlockSize($blockSize);
		$this->setMode($mode);
		$this->setIV('');
	}
  
/**
* 
* @param type $data
*/
	public function setData($data) 
	{
		$this->data = $data;
	}
  
/**
* 
* @param type $key
*/
	public function setKey($key) 
	{
		$this->key = $this->hex2bin($key);
	}
  
/**
* 
* @param type $blockSize
*/
	public function setBlockSize($blockSize) 
	{
		switch ($blockSize) 
		{
			case 128:
				$this->cipher = MCRYPT_RIJNDAEL_128;
				break;
      
			case 192:
				$this->cipher = MCRYPT_RIJNDAEL_192;
				break;
			case 256:
				$this->cipher = MCRYPT_RIJNDAEL_256;
				break;
		}
	}
	public function hex2bin($hexdata) 
	{
		$bindata="";

		for ($i=0;$i<strlen($hexdata);$i+=2) 
		{
			$bindata.=chr(hexdec(substr($hexdata,$i,2)));
		}

		return $bindata;
	}  
/**
* 
* @param type $mode
*/
	public function setMode($mode) 
	{
		switch ($mode) 
		{
			case Aes::M_CBC:
				$this->mode = MCRYPT_MODE_CBC;
				break;
		case Aes::M_CFB:
			$this->mode = MCRYPT_MODE_CFB;
			break;
		case Aes::M_ECB:
			$this->mode = MCRYPT_MODE_ECB;
			break;
		case Aes::M_NOFB:
			$this->mode = MCRYPT_MODE_NOFB;
			break;
		case Aes::M_OFB:
			$this->mode = MCRYPT_MODE_OFB;
			break;
		case Aes::M_STREAM:
			$this->mode = MCRYPT_MODE_STREAM;
			break;
		default:
			$this->mode = MCRYPT_MODE_ECB;
			break;
    }
  }
  
/**
* 
* @return boolean
*/
	public function validateParams() 
	{
		if ($this->data != null && $this->key != null && $this->cipher != null) 
		{
			return true;
		} 
		else 
		{
			return FALSE;
		}
	}
  
	public function setIV($IV) 
	{
		$this->IV = $IV;
	}
	protected function getIV() {
		if ($this->IV == "") {
			$this->IV = mcrypt_create_iv(mcrypt_get_iv_size($this->cipher, $this->mode), MCRYPT_RAND);
		}
		return $this->hex2bin($this->IV);
	}
  
/**
* @return type
* @throws Exception
*/
	public function encrypt() {
    
		if ($this->validateParams()) 
		{
			return trim(base64_encode(mcrypt_encrypt($this->cipher, $this->key, $this->data, $this->mode, $this->getIV())));
		} 
		else 
		{
			throw new Exception('Invlid params!');
		}
	}
/**
* 
* @return type
* @throws Exception
*/
	public function decrypt() 
	{
		if ($this->validateParams()) 
		{
			return trim(mcrypt_decrypt($this->cipher, $this->key, base64_decode($this->data), $this->mode, $this->getIV()));
		}
		else 
		{
			throw new Exception('Invlid params!');
		}
	}
  
}
 
//rfc1423

 

사용할 페이지

include "class/Aes.php";	//Encoding, Decoding Class

$key = "431007e1a4b4690ad0bbd65a37230c91";

//Encoding
function get_aes_encoding($text)
{
    global $key;
    $rtn="";
    if($text)
    {
        $aes = new Aes();
        $aes->setIV("9cdcd84b33bdcae8ee8cb05798cc19be");
        $aes->setKey($key);
        $aes->setBlockSize('128');
        $aes->setMode('cbc');
        $aes->setData($text);
        $rtn=$aes->encrypt();
    }
    return $rtn;
}

//Decoding
function get_aes_decoding($text)
{
    global $key;
    $rtn="";
    if($text)
    {
        $aes = new Aes();
        $aes->setIV("9cdcd84b33bdcae8ee8cb05798cc19be");
        $aes->setKey($key);
        $aes->setBlockSize('128');
        $aes->setMode('cbc');
        $aes->setData($text);
        $rtn=$aes->decrypt();
    }
    return $rtn;
}


$str = "123";
$en_str = get_aes_encoding($str);
echo $en_str;
echo "<br><br>";
echo get_aes_decoding($en_str);