com.google.crypto.tink.mac

Class MacWrapper

java.lang.Object

com.google.crypto.tink.mac.MacWrapper

All Implemented Interfaces:

PrimitiveWrapper<Mac,Mac>

public class MacWrapper
extends Object
implements PrimitiveWrapper<Mac,Mac>

MacWrapper is the implementation of PrimitiveWrapper for the Mac primitive.

The returned primitive works with a keyset (rather than a single key). To compute a MAC tag, it uses the primary key in the keyset, and prepends to the tag a certain prefix associated with the primary key. To verify a tag, the primitive uses the prefix of the tag to efficiently select the right key in the set. If the keys associated with the prefix do not validate the tag, the primitive tries all keys with OutputPrefixType.RAW.

Method Summary

Modifier and Type	Method and Description
Class<Mac>	getInputPrimitiveClass() Returns the primitive class object of the primitive used to create B.
Class<Mac>	getPrimitiveClass() Returns the primitive class object of the primitive managed.
static void	registerToInternalPrimitiveRegistry(PrimitiveRegistry.Builder primitiveRegistryBuilder) registerToInternalPrimitiveRegistry is a non-public method (it takes an argument of an internal-only type) registering an instance of MacWrapper to the provided PrimitiveRegistry.Builder.
Mac	wrap(PrimitiveSet<Mac> primitives) Wraps a PrimitiveSet and returns a single instance.

Methods inherited from class java.lang.Object

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

Method Detail

wrap

public Mac wrap(PrimitiveSet<Mac> primitives)
         throws GeneralSecurityException

Description copied from interface: PrimitiveWrapper

Wraps a PrimitiveSet and returns a single instance.

This method gets called when a new primitive is created. primitiveSet is immutable. This has to be implemented when a new primitive type is added.

Specified by:

wrap in interface PrimitiveWrapper<Mac,Mac>

Throws:

GeneralSecurityException

getPrimitiveClass

public Class<Mac> getPrimitiveClass()

Description copied from interface: PrimitiveWrapper

Returns the primitive class object of the primitive managed. Used for internal management. Should be implemented as return P.class; when implementing a wrapper creating objects of type P.

Specified by:

getPrimitiveClass in interface PrimitiveWrapper<Mac,Mac>

getInputPrimitiveClass

public Class<Mac> getInputPrimitiveClass()

Description copied from interface: PrimitiveWrapper

Returns the primitive class object of the primitive used to create B. Used for internal management. Should be implemented as return B.class;.

Specified by:

getInputPrimitiveClass in interface PrimitiveWrapper<Mac,Mac>

registerToInternalPrimitiveRegistry

public static void registerToInternalPrimitiveRegistry(PrimitiveRegistry.Builder primitiveRegistryBuilder)
                                                throws GeneralSecurityException

registerToInternalPrimitiveRegistry is a non-public method (it takes an argument of an internal-only type) registering an instance of MacWrapper to the provided PrimitiveRegistry.Builder.

Throws:

GeneralSecurityException