Package org.jose4j.jwe.kdf

Class ConcatKeyDerivationFunction

java.lang.Object

org.jose4j.jwe.kdf.ConcatKeyDerivationFunction

All Implemented Interfaces:

ConcatenationKeyDerivationFunctionWithSha256

public class ConcatKeyDerivationFunction
extends Object
implements ConcatenationKeyDerivationFunctionWithSha256

An implementation of Concatenation Key Derivation Function (aka Concat KDF or ConcatKDF) from Section 5.8.1 of National Institute of Standards and Technology (NIST), "Recommendation for Pair-Wise Key Establishment Schemes Using Discrete Logarithm Cryptography", NIST Special Publication 800-56A, Revision 2, May 2013.

Field Summary

Fields

Modifier and Type	Field	Description
private int	digestLength
private static final org.slf4j.Logger	log
private MessageDigest	messageDigest

Constructor Summary

Constructors

Constructor	Description
ConcatKeyDerivationFunction(String hashAlgoritm)
ConcatKeyDerivationFunction(String hashAlgoritm, String provider)

Method Summary

Modifier and Type	Method	Description
(package private) long	getReps(int keydatalen)
private void	init()
byte[]	kdf(byte[] sharedSecret, int keydatalen, byte[] otherInfo)
byte[]	kdf(byte[] sharedSecret, int keydatalen, byte[] algorithmId, byte[] partyUInfo, byte[] partyVInfo, byte[] suppPubInfo, byte[] suppPrivInfo)
private boolean	traceLog()

Methods inherited from class java.lang.Object

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

Field Details

log

private static final org.slf4j.Logger log

digestLength

private int digestLength

messageDigest

private MessageDigest messageDigest

Constructor Details

ConcatKeyDerivationFunction

public ConcatKeyDerivationFunction(String hashAlgoritm)

ConcatKeyDerivationFunction

public ConcatKeyDerivationFunction(String hashAlgoritm,
 String provider)

Method Details

init

private void init()

kdf

public byte[] kdf(byte[] sharedSecret,
 int keydatalen,
 byte[] algorithmId,
 byte[] partyUInfo,
 byte[] partyVInfo,
 byte[] suppPubInfo,
 byte[] suppPrivInfo)

kdf

public byte[] kdf(byte[] sharedSecret,
 int keydatalen,
 byte[] otherInfo)

Specified by:

kdf in interface ConcatenationKeyDerivationFunctionWithSha256

getReps

long getReps(int keydatalen)

traceLog

private boolean traceLog()