CODEWITHSUNDEEP
c#encryptioncryptographyrsa
MonoShiro
MonoShiro

Reputation: 83

RSACryptoServiceProvider encrypt and decrypt using own public and private key

I'm told that for asymmetric cryptography you encrypt plaintext with your public key and decrypt it with your private key. So i've tried the following:

    static void Main(string[] args)
    {
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        string pubkey = rsa.ToXmlString(false);
        string prikey = rsa.ToXmlString(true);

        byte[] someThing = RSAEncrypt(Encoding.Unicode.GetBytes("Hello World"), pubkey);
        byte[] anotherThing = RSADecrypt(someThing, prikey);

        Console.WriteLine(Convert.ToBase64String(anotherThing));
    }

and the encrypt and decrypt functions

    public static byte[] RSAEncrypt(byte[] plaintext, string destKey)
    {
        byte[] encryptedData;
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        rsa.FromXmlString(destKey);
        encryptedData = rsa.Encrypt(plaintext, true);
        rsa.Dispose();
        return encryptedData;
    }

    public static byte[] RSADecrypt(byte[] ciphertext, string srcKey)
    {
        byte[] decryptedData;
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        rsa.FromXmlString(srcKey);
        decryptedData = rsa.Decrypt(ciphertext, true);
        rsa.Dispose();
        return decryptedData;
    }

I'm expecting the console to display Hello World, but it displays this SABlAGwAbABvACAAVwBvAHIAbABkAA==. Am i using RSACryptoServiceProvider wrongly?

Upvotes: 7

Views: 21298

Answers (2)

Alex
Alex

Reputation: 21766

Your last line should read:

 Console.WriteLine(Encoding.Unicode.GetString(anotherThing));

Currently you are converting the decrypted string to Base64 encoding

Upvotes: 3

Blady214
Blady214

Reputation: 739

It is base 64, decode the string and you will get "Hello world".

Upvotes: 7

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