com.google.crypto.tink.subtle

Class PrfMac

java.lang.Object

com.google.crypto.tink.subtle.PrfMac

All Implemented Interfaces:

Mac

@Immutable
public class PrfMac
extends Object
implements Mac

Class that provides the functionality expressed by the Mac primitive using a Prf implementation.

Constructor Summary

Constructors

Constructor and Description
PrfMac(Prf wrappedPrf, int tagSize) Wrap wrappedPrf in a Mac primitive with the specified tagSize

Method Summary

Modifier and Type	Method and Description
byte[]	computeMac(byte[] data) Computes message authentication code (MAC) for data.
static Mac	create(AesCmacKey key) Creates an object implementing the Mac interface using an AesCmac underneath.
static Mac	create(HmacKey key) Creates an object implementing the Mac interface using an Hmac underneath.
void	verifyMac(byte[] mac, byte[] data) Verifies whether mac is a correct authentication code (MAC) for data.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PrfMac

public PrfMac(Prf wrappedPrf,
              int tagSize)
       throws GeneralSecurityException

Wrap wrappedPrf in a Mac primitive with the specified tagSize

Throws:

GeneralSecurityException

Method Detail

create

public static Mac create(AesCmacKey key)
                  throws GeneralSecurityException

Creates an object implementing the Mac interface using an AesCmac underneath.

Throws:

GeneralSecurityException

create

public static Mac create(HmacKey key)
                  throws GeneralSecurityException

Creates an object implementing the Mac interface using an Hmac underneath.

Throws:

GeneralSecurityException

computeMac

public byte[] computeMac(byte[] data)
                  throws GeneralSecurityException

Description copied from interface: Mac

Computes message authentication code (MAC) for data.

Specified by:

computeMac in interface Mac

Returns:

MAC value

Throws:

GeneralSecurityException

verifyMac

public void verifyMac(byte[] mac,
                      byte[] data)
               throws GeneralSecurityException

Description copied from interface: Mac

Verifies whether mac is a correct authentication code (MAC) for data.

Specified by:

verifyMac in interface Mac

Throws:

GeneralSecurityException - if mac is not a correct MAC for data