Hi all,
I have an encryption class that encrypts and decrypts password using
TripleDESCryptoServiceProvider. It was written originally in framework
1.0 and been working fine. And those passwords are stored in my SQL
server.
Now I need to migrate my application to framework 2.0. I use this same
class with framework 2.0 library to decrypt the passwords from database
(of course, they were encrypted in 1.0) but getting "Bad Data"
exception. The wierd thing is that, in 2.0 environment, it can encrypt
a new password and decrypt it back without any problem. It just cannot
decrypt the ones which were encrypted in 1.0.
Anyone experienced this problem before? Any ideas will be very
appreciated!!
Hans
I am also attaching the class as follows:
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace test
{
/// <summary>
/// Summary description for EncryptionManager.
/// </summary>
public class EncryptionManager
{
public const int Encryption = 0;
public const int Decryption = 1;
private EncryptionManager()
{
}
public static string Encrypt(string toEncrypt, string key)
{
UnicodeEncoding encoder = new UnicodeEncoding();
return encoder.GetString(ParseBytes(encoder.GetBytes(toEn crypt),
key, Encryption));
}
public static string Decrypt(string toDecrypt, string key)
{
UnicodeEncoding encoder = new UnicodeEncoding();
return encoder.GetString(ParseBytes(encoder.GetBytes(toDe crypt),
key, Decryption));
}
private static byte[] ParseBytes (byte[] data, string key, int
direction)
{
TripleDES des = new TripleDESCryptoServiceProvider() ;
des.IV = new byte[8];
//init stream to write / read data
MemoryStream memStream = new MemoryStream();
PasswordDeriveBytes derivedBytes = new PasswordDeriveBytes(key, new
byte[0]);
des.Key = derivedBytes.CryptDeriveKey("RC2", "MD5", 128, new
byte[8]);
//set transform according to direction
ICryptoTransform transform;
if (direction == Encryption)
{
transform = des.CreateEncryptor();
}
else
{
transform = des.CreateDecryptor();
}
CryptoStream cryptoStream = new CryptoStream (memStream,
transform,
CryptoStreamMode.Write);
cryptoStream.Write (data, 0, data.Length);
cryptoStream.FlushFinalBlock();
//get the length of the encrypted data...
byte[] encodedResult = new byte[memStream.Length];
memStream.Position = 0;
memStream.Read(encodedResult, 0, encodedResult.Length);
memStream.Close();
cryptoStream.Close();
return encodedResult;
}
public static string GenerateKey()
{
UnicodeEncoding encoder = new UnicodeEncoding();
TripleDES des = new TripleDESCryptoServiceProvider();
return encoder.GetString(des.Key);
}
}
}
