com.google.crypto.tink.mac

Class MacFactory

java.lang.Object

com.google.crypto.tink.mac.MacFactory

public final class MacFactory
extends Object

Static methods for obtaining Mac instances.

Usage

 KeysetHandle keysetHandle = ...;
 Mac mac = MacFactory.getPrimitive(keysetHandle);
 byte[] data = ...;
 byte[] tag = mac.computeMac(data);

 

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.

Since:

1.0.0

Constructor Summary

Constructors

Constructor and Description
MacFactory()

Method Summary

Modifier and Type	Method and Description
static Mac	getPrimitive(KeysetHandle keysetHandle)
static Mac	getPrimitive(KeysetHandle keysetHandle, KeyManager<Mac> keyManager)

Methods inherited from class java.lang.Object

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

Constructor Detail

MacFactory

public MacFactory()

Method Detail

getPrimitive

public static Mac getPrimitive(KeysetHandle keysetHandle)
                        throws GeneralSecurityException

Returns:

a Mac primitive from a keysetHandle.

Throws:

GeneralSecurityException

getPrimitive

public static Mac getPrimitive(KeysetHandle keysetHandle,
                               KeyManager<Mac> keyManager)
                        throws GeneralSecurityException

Returns:

a Mac primitive from a keysetHandle and a custom keyManager.

Throws:

GeneralSecurityException