org.bouncycastle.crypto.agreement.kdf
Class ConcatenationKDFGenerator

java.lang.Object
  org.bouncycastle.crypto.agreement.kdf.ConcatenationKDFGenerator

All Implemented Interfaces:

DerivationFunction

public class ConcatenationKDFGenerator

extends java.lang.Object

implements DerivationFunction

Generator for the Concatenation Key Derivation Function first specified in NIST SP 800-56A Section 5.8.1 and carried forward as the hash-based one-step key derivation function of SP 800-56C Rev. 2 Section 4.1: H(counter || Z || OtherInfo) with a 32-bit big-endian counter starting at 1.

Constructor Summary

ConcatenationKDFGenerator(Digest digest)

Method Summary

int	generateBytes(byte[] out, int outOff, int len) fill len bytes of the output buffer with bytes generated from the derivation function.
Digest	getDigest() return the underlying digest.
void	init(DerivationParameters param)

Methods inherited from class java.lang.Object

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

Constructor Detail

ConcatenationKDFGenerator

public ConcatenationKDFGenerator(Digest digest)

Parameters:

digest - the digest to be used as the source of generated bytes

Method Detail

init

public void init(DerivationParameters param)

Specified by:

init in interface DerivationFunction

getDigest

public Digest getDigest()

return the underlying digest.

generateBytes

public int generateBytes(byte[] out,
                         int outOff,
                         int len)
                  throws DataLengthException,
                         java.lang.IllegalArgumentException

fill len bytes of the output buffer with bytes generated from the derivation function.

Specified by:

generateBytes in interface DerivationFunction

Throws:

DataLengthException - if the out buffer is too small.

java.lang.IllegalArgumentException