Data encrypted in C# is 1 byte too long to be decrypted in Java

Question

I have a server written in Java which sends converts its RSA key to the XML format used by .NET before sending it to the client:

public String getPublicKeyXM         


        

Answer 1

This will not fix the problem (I tested it to no avail), but I wanted to call to your attention that RSACryptoServiceProvider implements the IDisposable interface and therefore should be properly disposed of when complete. Your C# encrypt method can be written a bit better (and more concise!) as such:

    public static byte[] encrypt(string xmlKey, byte[] bytes)
    {
        using (var rsa = new RSACryptoServiceProvider())
        {
            rsa.FromXmlString(xmlKey);
            return rsa.Encrypt(bytes, false);
        }
    }

Answer 2

I found the problem. The BigInteger's toByteArray() function included a leading zero for some reason. I just removed the leading zeros from the array and it now works like a charm!