Error:"Key not valid for use in specified state" for "RSACryptoServiceProvider.Encrypt()"
- From: Ismail Fatih Yıldırım <ismailfatih@xxxxxxxxx>
- Date: Sat, 2 Dec 2006 15:13:09 +0200
I modified the RSACSPSample from MSDN to try out a simple commutative encryption model using RSA encryption but when i run the progrem the first encryption command works but during the second encryption command (line : encryptedData2 = RSAE...) i get a "Key not valid for use in specified state." exception error even though i provide a valid second key to encrypt it. How can i overcome this error and get double encryption to work ?
The Code I use :
############################################################################################
using System;
using System.Security.Cryptography;
using System.Text;
class RSATest
{
static void Main()
{
try
{
//Create a UnicodeEncoder to convert between byte array and string.
UnicodeEncoding ByteConverter = new UnicodeEncoding();
//Create byte arrays to hold original, encrypted, and decrypted data.
byte[] dataToEncrypt = ByteConverter.GetBytes("Data to Encrypt");
byte[] encryptedData;
byte[] encryptedData2;
byte[] decryptedData;
//Create a new instances of RSACryptoServiceProvider
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
RSACryptoServiceProvider RSA2 = new RSACryptoServiceProvider();
//Pass the data to ENCRYPT, the public key information
encryptedData = RSAEncrypt(dataToEncrypt, RSA.ExportParameters(false), false);
encryptedData2 = RSAEncrypt(encryptedData, RSA2.ExportParameters(false), false);
//Pass the data to DECRYPT using private key information
decryptedData = RSADecrypt(encryptedData2, RSA.ExportParameters(true), false);
decryptedData = RSADecrypt(decryptedData, RSA2.ExportParameters(true), false);
//Display the decrypted plaintext to the console.
Console.WriteLine("Decrypted plaintext: {0}", ByteConverter.GetString(decryptedData));
}
catch (Exception ex)
{
//Catch this exception in case the encryption did
//not succeed.
Console.WriteLine(ex.Message);
}
}
static public byte[] RSAEncrypt(byte[] DataToEncrypt, RSAParameters RSAKeyInfo, bool DoOAEPPadding)
{
try
{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Import the RSA Key information.
RSA.ImportParameters(RSAKeyInfo);
//Encrypt the passed byte array and specify OAEP padding.
return RSA.Encrypt(DataToEncrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
//to the console.
catch (CryptographicException e)
{
Console.WriteLine(e.Message);
return null;
}
}
static public byte[] RSADecrypt(byte[] DataToDecrypt, RSAParameters RSAKeyInfo, bool DoOAEPPadding)
{
try
{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Import the RSA Key information. This needs
RSA.ImportParameters(RSAKeyInfo);
//Decrypt the passed byte array and specify OAEP padding.
return RSA.Decrypt(DataToDecrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
catch (CryptographicException e)
{
Console.WriteLine(e.ToString());
return null;
}
}
}
.
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