Question

我们有一个Windows Phone 8应用程序需要与使用Chilkat加密某些数据的Web服务进行通信。据我所知，Chilkat不支持Windows Phone平台。我有关于如何加密数据的密钥和其他信息（例如加密算法名称，密钥长度等），但是我可以在没有此库的情况下在Windows Phone上加密/解密吗？（我们已经有使用相同服务的android / ios应用程序，他们使用chilkat库来加密数据）

class Program
{
    static readonly string keyString = "MyKey";
    static readonly string iv = "MyIV";
    static Encoding TheEncoding = Encoding.UTF8;

    static void Main(string[] args)
    {
        //I got Chilkat and BouncyCastle via NuGet
        //https://www.nuget.org/packages/WinRTBouncyCastle/0.1.1.1
        //chilcat-win32

        var original = "clear text";

        var chilkatCrypt = GetChilkat3Des();

        //this is equalent to an encrypted text I get from the service
        var ckEncrypted = chilkatCrypt.EncryptStringENC(original);

        var ckDecrypted = chilkatCrypt.DecryptStringENC(ckEncrypted);

        if (!string.Equals(original, ckDecrypted)) throw new ArgumentException("chilkat encrypt/decrypt failure...");

        //now comes the challenge, to decrypt the Chilkat encryption with BouncyCastle (or what ever crypto lib that runs on WP8) 
        //this is where i need help :)
        byte[] chilkatEncBytes = System.Text.Encoding.UTF8.GetBytes(ckEncrypted);
        var bouncyDecrypted = BouncyCastleDecrypt(chilkatEncBytes);
    }

    public static Chilkat.Crypt2 GetChilkat3Des()
    {
        var crypt = new Chilkat.Crypt2();

        if (!crypt.UnlockComponent("Start my 30-day Trial"))
        {
            throw new Exception("Unlock Chilkat failed");
        }

        crypt.CryptAlgorithm = "3des";
        crypt.CipherMode = "cbc";
        crypt.KeyLength = 192;
        crypt.PaddingScheme = 0;
        //  It may be "hex", "url", "base64", or "quoted-printable".
        crypt.EncodingMode = "hex";
        crypt.SetEncodedIV(iv, crypt.EncodingMode);
        crypt.SetEncodedKey(keyString, crypt.EncodingMode);
        return crypt;
    }

    //this code is more or less copied from here:
    //http://nicksnettravels.builttoroam.com/post/2012/03/27/TripleDes-Encryption-with-Key-and-IV-for-Windows-Phone.aspx
    public static byte[] RunBouncyCastleTripleDes(byte[] input, bool encrypt)
    {
        byte[] byteKey = new byte[24];

        Buffer.BlockCopy(TheEncoding.GetBytes(keyString), 0, byteKey, 0, TheEncoding.GetBytes(keyString).Length);

        var IV = new byte[8];

        Buffer.BlockCopy(TheEncoding.GetBytes(iv), 0, IV, 0, TheEncoding.GetBytes(iv).Length);

        var keyParam = new Org.BouncyCastle.Crypto.Parameters.DesEdeParameters(byteKey);

        var ivParam = new Org.BouncyCastle.Crypto.Parameters.ParametersWithIV(keyParam, IV);
        var engine = Org.BouncyCastle.Security.CipherUtilities.GetCipher("DESede/CBC/PKCS5Padding");

        engine.Init(encrypt, ivParam);
        var output = engine.DoFinal(input);

        return output;
    }

    public static byte[] BouncyCastleEncrypt(byte[] input)
    {
        return RunBouncyCastleTripleDes(input, true);
    }

    public static byte[] BouncyCastleDecrypt(byte[] input)
    {
        return RunBouncyCastleTripleDes(input, false);
    }
}

Answer 1

我有关于如何加密数据的密钥和其他信息（例如加密算法名称，密钥长度等），但是我可以在没有此库的情况下在Windows Phone上加密/解密吗？

这取决于，但答案可能是肯定的。

如果他们有一个众所周知的算法的本土实现，那么他们可能有一个错误，答案可能是NO。

如果他们使用众所周知的算法，那么经过严格审查的库和已经完全指定了算法和参数，答案很可能就是。

如何在不使用Chilcat库的情况下解密使用Chilkat进行加密的数据

1 个答案: