public void With_EncryptDecrypt()
{
CryptoAlgorithm algorithm = context.Build();
functionToInvoke = (data) =>
{
var encrypted = algorithm.Encrypt(data);
return(algorithm.Decrypt(encrypted));
};
}
public HmacDigest()
{
var Keys = new AppKeys();
CryptoAlgorithm secretDecryptor = new CryptoAlgorithm("ENCRYPT", "FSCS", new AesManaged());
PublicKey = Keys.Key;
SecretKey = secretDecryptor.Decrypt(Keys.Secret);
EpochTime = Convert.ToInt64((DateTime.Now - new DateTime(1970, 1, 1)).TotalSeconds);
System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
byte[] keyByte = encoding.GetBytes(SecretKey);
HMACSHA256 sha = new HMACSHA256(keyByte);
byte[] byteData = encoding.GetBytes(EpochTime.ToString());
byte[] hashedDataOutput = sha.ComputeHash(byteData);
HashedString = ByteToString(hashedDataOutput);
HashedStringBase64 = Convert.ToBase64String(hashedDataOutput);
}
private void DecryptButton_Click(object sender, RoutedEventArgs e)
{
byte[] textToDecodeBytes;
if (filePath == string.Empty)
{
textToDecodeBytes = Encoding.ASCII.GetBytes(TextToDecryptTextBox.Text);
}
else
{
textToDecodeBytes = File.ReadAllBytes(filePath);
}
if (DecryptionKeyTextBox.Text.Length != 8)
{
MessageBox.Show("Key must be an 8byte string", "Error!");
return;
}
BitArray encryptionKey = new BitArray(Encoding.ASCII.GetBytes(DecryptionKeyTextBox.Text));
if (textToDecodeBytes.Length == 0)
{
MessageBox.Show("There is nothing to decode", "Error!");
}
BitArray bitArrayToDecode = new BitArray(textToDecodeBytes).RevertEveryByte();
bool[] bitsToDecode = new bool[bitArrayToDecode.Count];
bitArrayToDecode.CopyTo(bitsToDecode, 0);
DESBuilder builder = new DESBuilder();
builder.AddWholeDES(encryptionKey);
CryptoAlgorithm des = builder.Build();
bool[] decrypted = des.Decrypt(bitsToDecode);
decryptedBytes = decrypted.ToByteArray();
DecryptedTextBox.Text = Encoding.ASCII.GetString(decryptedBytes);
filePath = string.Empty;
}
