/// <summary>
/// Encrypted the data.
/// </summary>
/// <param name="data">The data to encrypted.</param>
/// <param name="passphrase">The passphrase key used to mask the data.</param>
/// <returns>The encrypted data.</returns>
public byte[] Encrypt(byte[] data, string passphrase)
{
// Create the key parameters.
byte[] key = Encoding.Default.GetBytes(passphrase);
Key.Crypto.Parameters.KeyParameter keyParameter = new KeyParameter(key);
// Initialise the cryptography engine.
Key.Crypto.Engines.BlowfishEngine blowfish = new BlowfishEngine();
blowfish.Init(true, keyParameter);
int dataLength = data.Length;
int blockSize = blowfish.GetBlockSize();
int modBlockSize = dataLength % blockSize;
int blockCount = dataLength / blockSize;
// If there is a remained then add en extra block count.
if ((modBlockSize) > 0)
{
// Add one extra block.
blockCount++;
}
// Encrypted data store.
byte[] encryptedData = new byte[blockCount * blockSize];
byte[] decryptedData = new byte[blockCount * blockSize];
// Copy the decrypted data.
for (int j = 0; j < dataLength; j++)
{
// Assign the data.
decryptedData[j] = data[j];
}
// For each block size in the the data.
for (int i = 0; i < blockCount; i++)
{
// Encrypt the block.
blowfish.ProcessBlock(decryptedData, (i * blockSize), encryptedData, (i * blockSize));
}
// Return the encrypted data.
return(encryptedData);
}
private void decrypt(byte[] value, BlowfishEngine bf)
{
int blockSize = bf.GetBlockSize();
byte[] vector = new byte[blockSize];
for (int i = 0; i < blockSize; i++)
{
vector[i] = 0;
}
for (int i = 0; i < value.Length; i += blockSize)
{
byte[] tmp = new byte[blockSize];
bf.ProcessBlock(vector, 0, tmp, 0);
int chunk = Math.Min(blockSize, value.Length - i);
for (int j = 0; j < chunk; j++)
{
vector[j] = value[i + j];
value[(i + j)] = (byte)(value[(i + j)] ^ tmp[j]);
}
;
}
;
}