org.bouncycastle.crypto.generators
Class MGF1BytesGenerator

java.lang.Object
  org.bouncycastle.crypto.generators.MGF1BytesGenerator

All Implemented Interfaces:

DerivationFunction

public class MGF1BytesGenerator
extends java.lang.Object
implements DerivationFunction

Generator for MGF1 as defined in PKCS 1v2

Field Summary

private Digest	digest
private int	hLen
private byte[]	seed

Constructor Summary

MGF1BytesGenerator(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)
private void	ItoOSP(int i, byte[] sp) int to octet string.

Methods inherited from class java.lang.Object

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

Field Detail

digest

private Digest digest

seed

private byte[] seed

hLen

private int hLen

Constructor Detail

MGF1BytesGenerator

public MGF1BytesGenerator(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.

Specified by:

getDigest in interface DerivationFunction

ItoOSP

private void ItoOSP(int i,
                    byte[] sp)

int to octet string.

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