php - フラッシュ暗号化PHP復号化

Question

PHPで簡単に復号化できるフラッシュでの暗号化についてアドバイスしてください。

Answer 1

Flashの場合、http：//code.google.com/p/as3crypto/をサポートできます

• RSA
• DES
• AES
• ふぐ-
• MD5
• SHA
• X509
• RC4

PHPを使用できますmycrypt http://www.php.net/manual/en/mcrypt.examples.phpRSA、DES、AES、Blowfish、MD5、SHA、X509、RC4 上記のすべての暗号化もサポートされています

フラッシュクラスの例

package
{
        import flash.display.Sprite;
        import flash.utils.ByteArray;

        import com.hurlant.crypto.symmetric.ICipher;
        import com.hurlant.crypto.symmetric.IVMode;
        import com.hurlant.crypto.symmetric.IMode;
        import com.hurlant.crypto.symmetric.NullPad;
        import com.hurlant.crypto.symmetric.PKCS5;
        import com.hurlant.crypto.symmetric.IPad;
        import com.hurlant.util.Base64;
        import com.hurlant.util.Hex;
        import com.hurlant.crypto.Crypto;

        public class CryptoCode extends Sprite
        {
                private var type:String='simple-des-ecb';
                private var key:ByteArray;

                public function CryptoCode()
                {
                        init();
                }

                private function init():void
                {
                        key = Hex.toArray(Hex.fromString('TESTTEST'));// can only be 8 characters long

                        trace(encrypt('TEST TEST'));
                        trace(decrypt(encrypt('TEST TEST'));
                }

                private function encrypt(txt:String = ''):String
                {
                        var data:ByteArray = Hex.toArray(Hex.fromString(txt));

                        var pad:IPad = new PKCS5;
                        var mode:ICipher = Crypto.getCipher(type, key, pad);
                        pad.setBlockSize(mode.getBlockSize());
                        mode.encrypt(data);
                        return Base64.encodeByteArray(data);
                }
                private function decrypt(txt:String = ''):String
                {
                        var data:ByteArray = Base64.decodeToByteArray(txt);
                        var pad:IPad = new PKCS5;
                        var mode:ICipher = Crypto.getCipher(type, key, pad);
                        pad.setBlockSize(mode.getBlockSize());
                        mode.decrypt(data);
                        return Hex.toString(Hex.fromArray(data));
                }
        }

}

PHPクラスの例

class Crypt
{
        var $key = NULL;
        var $iv = NULL;
        var $iv_size = NULL;

        function Crypt()
        {
                $this->init();
        }

        function init($key = "")
        {
                $this->key = ($key != "") ? $key : "";

                $this->algorithm = MCRYPT_DES;
                $this->mode = MCRYPT_MODE_ECB;

                $this->iv_size = mcrypt_get_iv_size($this->algorithm, $this->mode);
                $this->iv = mcrypt_create_iv($this->iv_size, MCRYPT_RAND);
        }

        function encrypt($data)
        {
                $size = mcrypt_get_block_size($this->algorithm, $this->mode);
                $data = $this->pkcs5_pad($data, $size);
                return base64_encode(mcrypt_encrypt($this->algorithm, $this->key, $data, $this->mode, $this->iv));
        }

        function decrypt($data)
        {
                return $this->pkcs5_unpad(rtrim(mcrypt_decrypt($this->algorithm, $this->key, base64_decode($data), $this->mode, $this->iv)));
        }

        function pkcs5_pad($text, $blocksize)
        {
                $pad = $blocksize - (strlen($text) % $blocksize);
                return $text . str_repeat(chr($pad), $pad);
        }

        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);
        }
}

使用法フラッシュ

// instance of crypto class
 private var _crypto : CryptoCode;
 public var myLoader : URLLoader;

// create instance with encryption key
 _crypto = new CryptoCode("PASSWORD");

// send crypted string to php script
 var variables : URLVariables = new URLVariables();
 variables.message = _crypto.encrypt(tosend_in.text);

// create request with POST method
 var request : URLRequest = new URLRequest("http://www.lecrabe.net/wordpress/demo/crypt/scripts/testcrypto.php");
 request.method = URLRequestMethod.POST;
 request.data = variables;

 // send request
 myLoader.load(request);

使用法PHP

include_once "lib/cryptlib.php";

// init a new instance of Crypto Class
$crypto = new Crypt;

// init with the encryption key
$result = $crypto->init("PASSWORD");

// get the POST data
$messagefromflash = $_POST ["message"];

// decrypt data
$decrypted_messagefromflash = $crypto->decrypt(utf8_decode($messagefromflash));