Encryt在.Net和解密AS3 [英] Encryt in .Net and decrypt in AS3

问题描述

我需要一些文件加密的ASP.net和解密他们建有动作脚本3 Flash应用程序

I need to encrypt some files in ASP.net and decrypt them in a flash application built with Action Script 3.

AS3开发者发现一个lib电话AS3crypto这似乎是一个很好的一个AS3。这个想法是加密和解密使用相同的密钥。对称加密？

AS3 developer found a lib call AS3crypto which seems like a good one for AS3. The idea is encrypt and decrypt using same key. Symmetrical Encryption?

但我在努力寻找净相当于将使用相同​​的算法进行加密。

But I am struggling to find .Net equivalent that would use same algorithm for encryption.

我试图从4guysfromrolla博客这对我的工作太慢RC4的例子。 我曾尝试AES在这​​个例子中（<一href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.rijndaelmanaged(v=vs.100).aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.security.cryptography.rijndaelmanaged(v=vs.100).aspx)这.Net的伟大工程，但我似乎无法使用AS3crypto获得相同的文件重新进行解密。AS3crypto似乎不喜欢有四进行解密。我只能提供一个密钥。

I have tried RC4 example from 4guysfromrolla blog which works too slow for me. I have tried AES on this example (http://msdn.microsoft.com/en-us/library/system.security.cryptography.rijndaelmanaged(v=vs.100).aspx) which works great on .Net but I can't seem to decrypt using AS3crypto to get the same file back. AS3crypto doesn't seem to like to have IV for decryption. I can only supply one key.

到目前为止，我很失落。我如何可以加密在.net中的文件和解密回在AS3得到同样的文件回来？

So far I am lost. How can I encrypt a file in .Net and decrypt it back in AS3 to get the same file back?

推荐答案

请注意：使用16字符长度的密钥和IV，例如：关键：1234567890123456和IV：9876543210654321

Notice: use 16 char length for both Key and IV, ex: Key: 1234567890123456 and IV: 9876543210654321

下面是C＃code

    public byte[] Encrypt(byte[] someData, string KEY, string IV)
    {
        //preparing
        byte[] keyBytes = Encoding.UTF8.GetBytes(KEY); 
        byte[] ivBytes = Encoding.UTF8.GetBytes(IV); 


        //here goes encryption
        RijndaelManaged rijndaelManaged = new RijndaelManaged();
        rijndaelManaged.Key = keyBytes;
        rijndaelManaged.IV = ivBytes;
        rijndaelManaged.BlockSize = 128;
        rijndaelManaged.Mode = CipherMode.CBC;
        ICryptoTransform encryptor = rijndaelManaged.CreateEncryptor(rijndaelManaged.Key, rijndaelManaged.IV);

        byte[] result = null;
        using (MemoryStream memoryStream = new MemoryStream())
        {
            using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
            {
                cryptoStream.Write(someData, 0, someData.Length);
                cryptoStream.FlushFinalBlock();
                result = memoryStream.ToArray();
            }
        }

        return result;


    }

下面是使用AS3Crypto库AS3 code

And here is AS3 code using AS3Crypto library

    private function decrypt(input:ByteArray, decrKey:String, decrIV:String):ByteArray
    {

        var key:ByteArray = Hex.toArray(Hex.fromString(decrKey));
        var pad:IPad = new NullPad();
        var aes:ICipher = Crypto.getCipher("aes-cbc", key, pad);
        var ivmode:IVMode = aes as IVMode;
        ivmode.IV = Hex.toArray(Hex.fromString(decrIV));
        aes.decrypt(input);

        return input;
    }

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