org.apache.kerby.kerberos.kerb.crypto.fast

Class FastUtil

java.lang.Object

org.apache.kerby.kerberos.kerb.crypto.fast.FastUtil

public class FastUtil
extends Object

Implementing FAST (RFC6113) armor key related algorithms. Take two keys and two pepper strings as input and return a combined key.

Constructor Summary

Constructors

Constructor and Description
FastUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static EncryptionKey	cf2(EncryptionKey key1, String pepper1, EncryptionKey key2, String pepper2)
static EncryptionKey	makeArmorKey(EncryptionKey subkey, EncryptionKey ticketKey) Make an encryption key for armoring.
static EncryptionKey	makeReplyKey(EncryptionKey strengthenKey, EncryptionKey existingKey) Make an encryption key for replying.
static byte[]	prfPlus(EncryptionKey key, String pepper, int keyBytesLen) Call the PRF function multiple times with the pepper prefixed with a count byte to get enough bits of output.

Methods inherited from class java.lang.Object

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

Constructor Detail

FastUtil

public FastUtil()

Method Detail

prfPlus

public static byte[] prfPlus(EncryptionKey key,
             String pepper,
             int keyBytesLen)
                      throws KrbException

Call the PRF function multiple times with the pepper prefixed with a count byte to get enough bits of output.

Parameters:

key - The encryption key

pepper - The pepper

keyBytesLen - The key bytes length

Returns:

The output byte

Throws:

KrbException - e

cf2

public static EncryptionKey cf2(EncryptionKey key1,
                String pepper1,
                EncryptionKey key2,
                String pepper2)
                         throws KrbException

Throws:

KrbException

makeReplyKey

public static EncryptionKey makeReplyKey(EncryptionKey strengthenKey,
                         EncryptionKey existingKey)
                                  throws KrbException

Make an encryption key for replying.

Parameters:

strengthenKey - The strengthen key

existingKey - The existing key

Returns:

encryption key

Throws:

KrbException - e

makeArmorKey

public static EncryptionKey makeArmorKey(EncryptionKey subkey,
                         EncryptionKey ticketKey)
                                  throws KrbException

Make an encryption key for armoring.

Parameters:

subkey - The sub key

ticketKey - The ticket key

Returns:

encryption key

Throws:

KrbException - e