C#.NET - Decryption problem

[mcco]

I use VS2008, and I encrypted a file using this function:

        public static void Encrypt(string fileIn, string fileOut, string Password)
        {
 
            FileStream fsIn = new FileStream(fileIn,
                FileMode.Open, FileAccess.Read);
            FileStream fsOut = new FileStream(fileOut,
                FileMode.OpenOrCreate, FileAccess.Write);
 
            PasswordDeriveBytes pdb = new PasswordDeriveBytes(Password,
                new byte[] {0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 
            0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76});
 
            Rijndael alg = Rijndael.Create();
            alg.Key = pdb.GetBytes(32);
            alg.IV = pdb.GetBytes(16);
 
            CryptoStream cs = new CryptoStream(fsOut,
                alg.CreateEncryptor(), CryptoStreamMode.Write);
 
            int bufferLen = 4096;
            byte[] buffer = new byte[4096];
            int bytesRead;
 
            do
            {
                bytesRead = fsIn.Read(buffer, 0, bufferLen);
 
                cs.Write(buffer, 0, bytesRead);
            } while (bytesRead != 0);
 
            cs.Close();
            fsIn.Close();
        }
 

Now I tried to make a function that will convert an encoded BMP file to bitmap and when it gets to the return line it says "A generic error occurred in GDI+."

Here is the function:

        public static Bitmap DecryptToBitmap(string fileIn, string Password)
        {
            FileStream fsIn = new FileStream(fileIn, FileMode.Open, FileAccess.Read);
 
            PasswordDeriveBytes pdb = new PasswordDeriveBytes(Password,
                new byte[] {0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 
            0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76});
            Rijndael alg = Rijndael.Create();
 
            alg.Key = pdb.GetBytes(32);
            alg.IV = pdb.GetBytes(16);
 
            MemoryStream ms = new MemoryStream();
 
            CryptoStream cs = new CryptoStream(ms,
                alg.CreateDecryptor(), CryptoStreamMode.Write);
 
            int bufferLen = 4096;
            byte[] buffer = new byte[4096];
            int bytesRead;
 
            do
            {
                bytesRead = fsIn.Read(buffer, 0, bufferLen);
 
                cs.Write(buffer, 0, bytesRead);
 
            } while (bytesRead != 0);
 
            fsIn.Close();
 
            byte[] decryptedData = ms.ToArray();
 
            MemoryStream img = new MemoryStream(decryptedData);
 
            return new Bitmap(img);
        }
 

Please help me figure out the problem.
Thanks in advance.

[Celeritask]

It sounds like something might be going wrong in your decryption/encryption scheme. Have you tried matching the byte arrays that represent the Bitmap before and after encryption?

[mcco]

It sounds like something might be going wrong in your decryption/encryption scheme. Have you tried matching the byte arrays that represent the Bitmap before and after encryption?

I have another function that decrypts the file to another file. and it works perfectly. only when I run the one that decrypts to bitmap it doesn't work..
this is the decrypt function:

        public static void Decrypt(string fileIn, string fileOut, string Password)
        {
 
            FileStream fsIn = new FileStream(fileIn,
                        FileMode.Open, FileAccess.Read);
            FileStream fsOut = new FileStream(fileOut,
                        FileMode.OpenOrCreate, FileAccess.Write);
 
            PasswordDeriveBytes pdb = new PasswordDeriveBytes(Password,
                new byte[] {0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 
            0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76});
            Rijndael alg = Rijndael.Create();
 
            alg.Key = pdb.GetBytes(32);
            alg.IV = pdb.GetBytes(16);
 
            CryptoStream cs = new CryptoStream(fsOut,
                alg.CreateDecryptor(), CryptoStreamMode.Write);
 
            int bufferLen = 4096;
            byte[] buffer = new byte[4096];
            int bytesRead;
 
            do
            {
                bytesRead = fsIn.Read(buffer, 0, bufferLen);
 
                cs.Write(buffer, 0, bytesRead);
 
            } while (bytesRead != 0);
 
            cs.Close();
 
            fsIn.Close();
        }