I'm experimenting with ProtectData.Protect() and ProtectData.Unprotect() functions in C#. I've written a program that writes encrypted data to an SQLite database, and then reads the database and decrypt the data. Every time I run my code I receive the following error:
Unhandled Exception: System.Security.Cryptography.CryptographicException: The parameter is incorrect.
at System.Security.Cryptography.ProtectedData.Unprotect(Byte[] encryptedData, Byte[] optionalEntropy, DataProtectionScope scope)
at MyProgram.ReadData(SQLiteConnection conn)
at MyProgram.Main()
The full code is very long, but here is the decrypt() function. I'm passing a byte array; I have verified the type to be a byte array using myByteData.GetType(), which returns System.Byte[].
public static byte [] decrypt( byte [] data ) {
byte [] s_additionalEntropy = null;
try {
//Decrypt
return ProtectedData.Unprotect( data, s_additionalEntropy, DataProtectionScope.CurrentUser );
}catch{
try {
return ProtectedData.Unprotect( data, s_additionalEntropy, DataProtectionScope.LocalMachine );
}catch (Exception e){
Console.Write("Error: ");
Console.WriteLine(e.Message);
return null;
}
}
}