protected /*virtual */ BufferSegment CalculateRecordMac(KeyParameter macKey, BufferSegment additionalData, byte[] buf, int off, int len)
{
Poly1305 mac = new Poly1305();
mac.Init(macKey);
UpdateRecordMacText(mac, additionalData);
UpdateRecordMacText(mac, new BufferSegment(buf, off, len));
UpdateRecordMacLength(mac, additionalData.Count);
UpdateRecordMacLength(mac, len);
return(MacUtilities.DoFinalOptimized(mac));
}
/**
* Calculate the MAC for some given data.
*
* @param type The message type of the message.
* @param message A byte-buffer containing the message.
* @param offset The number of bytes to skip, before the message starts.
* @param length The length of the message.
* @return A new byte-buffer containing the MAC value.
*/
public /*virtual */ BufferSegment CalculateMac(long seqNo, byte type, byte[] message, int offset, int length)
{
ProtocolVersion serverVersion = context.ServerVersion;
bool isSsl = serverVersion.IsSsl;
int macHeaderLength = isSsl ? 11 : 13;
byte[] macHeader = BufferPool.Get(macHeaderLength, true);
TlsUtilities.WriteUint64(seqNo, macHeader, 0);
TlsUtilities.WriteUint8(type, macHeader, 8);
if (!isSsl)
{
TlsUtilities.WriteVersion(serverVersion, macHeader, 9);
}
TlsUtilities.WriteUint16(length, macHeader, macHeaderLength - 2);
mac.BlockUpdate(macHeader, 0, macHeaderLength);
mac.BlockUpdate(message, offset, length);
BufferPool.Release(macHeader);
return(Truncate(MacUtilities.DoFinalOptimized(mac)));
}