/// <summary>
/// Encrypts a single block.
/// </summary>
/// <param name="input">Block to encrypt.</param>
/// <returns>Encrypted block</returns>
public byte[] Encrypt(byte[] input)
{
State state = new State(input);
if (Debugging.IsEnabled)
{
Debugging.Trace("Encrypting these plaintext bytes:");
ByteUtilities.WriteBytes(input);
Debugging.Trace("");
Debugging.Trace("Initial state:");
Debugging.Trace(state.ToString());
Debugging.Trace("");
}
_InitialRound.Apply(state, 0);
int totalRounds = _Settings.Rounds;
for (int round = 1; round < totalRounds; round++)
{
_IntermediateRound.Apply(state, round);
}
_FinalRound.Apply(state, totalRounds);
byte[] encryptedBytes = state.ToByteArray();
if(Debugging.IsEnabled)
{
Debugging.Trace("Encryption resulted in this ciphertext:");
ByteUtilities.WriteBytes(encryptedBytes);
}
return encryptedBytes;
}
/// <summary>
/// Decrypts a single block.
/// </summary>
/// <param name="input">Block to decrypt.</param>
/// <returns>The decrypted block.</returns>
public byte[] Decrypt(byte[] input)
{
// Decryption does everything in reverse
State state = new State(input);
int totalRounds = _Settings.Rounds;
_FinalRound.Inverse(state, totalRounds);
for (int round = (totalRounds - 1); round > 0; round--)
{
_IntermediateRound.Inverse(state, round);
}
_InitialRound.Inverse(state, 0);
return state.ToByteArray();
}