/// <summary>
/// Compute partial encryption of the original data based on individual key derived from hash of main password and <see cref="Salt"/>
/// </summary>
/// <param name="encryptionService">Encryption service to use for encryption</param>
/// <param name="keyPassword">Hash of main password</param>
public void ComputePartEncryption(EncryptionService encryptionService, byte[] keyPassword)
{
if (Original != null)
{
if (Salt == null)
{
Salt = encryptionService.GenerateRandomCryptographicKey(32);
}
var newKeyPassword = encryptionService.GetIndividualKeyInBytes(keyPassword, Salt);
EncryptedPart = encryptionService.Encrypt(newKeyPassword, Original.ToString());
var check = encryptionService.Decrypt(newKeyPassword, EncryptedPart);
if (check != Original.ToString())
{
throw new Exception("Can not be decrypted.");
}
Original = null;
}
}
/// <summary>
/// Decrypt the original data from only partially encrypted/decrypted data
/// </summary>
/// <typeparam name="T">Type of result</typeparam>
/// <param name="encryptionService">Encryption service to use for decryption</param>
/// <param name="keyPassword">Hash of main password</param>
/// <param name="convert">Converter from decrypted string into type T; not needed to specify if result is string, int, double or bool</param>
/// <returns>Decrypted data of type T</returns>
public T Decrypt <T>(EncryptionService encryptionService, byte[] keyPassword, Func <string, T> convert = null)
{
T result = default(T);
if (EncryptedPart != null)
{
if (Salt == null)
{
Salt = encryptionService.GenerateRandomCryptographicKey(32);
}
var individualKeyPassword = encryptionService.GetIndividualKeyInBytes(keyPassword, Salt);
var decryptedPart = encryptionService.Decrypt(individualKeyPassword, EncryptedPart);
if (typeof(T) == typeof(string))
{
result = (T)Convert.ChangeType(decryptedPart, typeof(string));
}
else if (typeof(T) == typeof(int))
{
result = (T)Convert.ChangeType(decryptedPart, typeof(int));
}
else if (typeof(T) == typeof(double))
{
result = (T)Convert.ChangeType(decryptedPart, typeof(double));
}
else if (typeof(T) == typeof(bool))
{
result = (T)Convert.ChangeType(decryptedPart, typeof(bool));
}
else if (convert != null)
{
result = convert(decryptedPart);
}
}
Original = result;
return(result);
}