org.spongycastle.tls.crypto.impl

Interface TlsSuiteMac

public interface TlsSuiteMac

Base interface for a generic TLS MAC implementation for use with a cipher suite.

Method Summary

Modifier and Type	Method and Description
byte[]	calculateMac(long seqNo, short type, byte[] message, int offset, int length) Calculate the MAC for some given data.
byte[]	calculateMacConstantTime(long seqNo, short type, byte[] message, int offset, int length, int expectedLength, byte[] randomData) Constant time calculation of the MAC for some given data with a given expected length.
int	getSize() Return the output length (in bytes) of this MAC.

Method Detail

getSize

int getSize()

Return the output length (in bytes) of this MAC.

Returns:

The output length of this MAC.

calculateMac

byte[] calculateMac(long seqNo,
                    short type,
                    byte[] message,
                    int offset,
                    int length)

Calculate the MAC for some given data.

Parameters:

type - The message type of the message.

message - A byte array containing the message.

offset - The number of bytes to skip, before the message starts.

length - The length of the message.

Returns:

A new byte array containing the MAC value.

calculateMacConstantTime

byte[] calculateMacConstantTime(long seqNo,
                                short type,
                                byte[] message,
                                int offset,
                                int length,
                                int expectedLength,
                                byte[] randomData)

Constant time calculation of the MAC for some given data with a given expected length.

Parameters:

seqNo - The sequence number of the cipher text.

type - The content type of the message.

message - A byte array containing the message.

offset - The number of bytes to skip, before the message starts.

length - The length of the message.

expectedLength - The expected length of the full message,

randomData - Random data for padding out the MAC calculation if required.

Returns:

A new byte array containing the MAC value.