Bad Data

[ravingcoder]

My experience with "Bad data" when trying to decrypt buffers using RSACryptoServiceProvider is incorrect block size. What else is possible?

[ravfingcoder]

Hi, having trouble decrypting a buffer using RSA. Did you find solution to the problem yet? Here's the code - I've highlighted the problem with "QUESTION" tags. Here's my code, please take a look. Thanks. using System; using System.Text; using System.Security.Cryptography; namespace tryRSA { /// /// Summary description for Class1. /// class Class1 { /// /// The main entry point for the application. /// [STAThread] static void Main(string[] args) { //Main int index=0; int iterations=0; int blocksize=0; int KeySizeByte=0; byte [] btSecret; byte [] btEncryptedSecret; byte [] btDescrambledSecret; byte [] btPlainTxtToken; byte [] btEncryptedToken; string secret = "This is a long secret"; ASCIIEncoding AE = new ASCIIEncoding(); RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); KeySizeByte = RSA.KeySize/8; blocksize = KeySizeByte -11; //QUESTION 1: I've been told that blocksize is equal Key size less 11 bytes. How'd you know that? Console.WriteLine("Key size: {0}", KeySizeByte); Console.WriteLine("blocksize: {0}", blocksize); btSecret = AE.GetBytes(secret); if(btSecret.Length % blocksize != 0) { iterations = btSecret.Length/blocksize +1; } else { iterations = btSecret.Length/blocksize; } index=0; btPlainTxtToken = new byte [blocksize]; btEncryptedSecret = new byte [iterations*blocksize]; for(int i=0; i