public void Hide(Stream messageStream, Stream keyStream)
{
byte[] waveBuffer = new byte[bytesPerSample];
byte message, bit, waveByte;
int messageBuffer, keyByte;
while ((messageBuffer = messageStream.ReadByte()) >= 0)
{
//read one byte of the message
message = (byte)messageBuffer;
//for each bit in message
for (int bitIndex = 0; bitIndex < 8; bitIndex++)
{
//read a byte from the key
keyByte = GetKeyValue(keyStream);
//skip samples
for (int n = 0; n < keyByte - 1; n++)
{
sourceStream.Copy(waveBuffer, 0, waveBuffer.Length, destinationStream);
}
//read one sample from the wave stream
sourceStream.Read(waveBuffer, 0, waveBuffer.Length);
waveByte = waveBuffer[bytesPerSample - 1];
bit = (byte)(((message & (byte)(1 << bitIndex)) > 0) ? 1 : 0);
//change the last bit of the sample
if ((bit == 1) && ((waveByte % 2) == 0))
{
waveByte += 1;
}
else if ((bit == 0) && ((waveByte % 2) == 1))
{
waveByte -= 1;
}
waveBuffer[bytesPerSample - 1] = waveByte;
//write the result to destinationStream
destinationStream.Write(waveBuffer, 0, bytesPerSample);
}
}
waveBuffer = new byte[sourceStream.Length - sourceStream.Position];
sourceStream.Read(waveBuffer, 0, waveBuffer.Length);
destinationStream.Write(waveBuffer, 0, waveBuffer.Length);
}
