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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.crypto.digests;

import org.bouncycastle.crypto.ExtendedDigest;
import org.bouncycastle.crypto.engines.ThreefishEngine;
import org.bouncycastle.crypto.params.SkeinParameters;
import org.bouncycastle.util.Memoable;

/**
 * Implementation of the Skein parameterised hash function in 256, 512 and 1024 bit block sizes,
 * based on the {@link ThreefishEngine Threefish} tweakable block cipher.
 * 

* This is the 1.3 version of Skein defined in the Skein hash function submission to the NIST SHA-3 * competition in October 2010. *

* Skein was designed by Niels Ferguson - Stefan Lucks - Bruce Schneier - Doug Whiting - Mihir * Bellare - Tadayoshi Kohno - Jon Callas - Jesse Walker. * * @see SkeinEngine * @see SkeinParameters */ public class SkeinDigest implements ExtendedDigest, Memoable { /** * 256 bit block size - Skein-256 */ public static final int SKEIN_256 = SkeinEngine.SKEIN_256; /** * 512 bit block size - Skein-512 */ public static final int SKEIN_512 = SkeinEngine.SKEIN_512; /** * 1024 bit block size - Skein-1024 */ public static final int SKEIN_1024 = SkeinEngine.SKEIN_1024; private SkeinEngine engine; /** * Constructs a Skein digest with an internal state size and output size. * * @param stateSizeBits the internal state size in bits - one of {@link #SKEIN_256}, {@link #SKEIN_512} or * {@link #SKEIN_1024}. * @param digestSizeBits the output/digest size to produce in bits, which must be an integral number of * bytes. */ public SkeinDigest(int stateSizeBits, int digestSizeBits) { this.engine = new SkeinEngine(stateSizeBits, digestSizeBits); init(null); } public SkeinDigest(SkeinDigest digest) { this.engine = new SkeinEngine(digest.engine); } public void reset(Memoable other) { SkeinDigest d = (SkeinDigest)other; engine.reset(d.engine); } public Memoable copy() { return new SkeinDigest(this); } public String getAlgorithmName() { return "Skein-" + (engine.getBlockSize() * 8) + "-" + (engine.getOutputSize() * 8); } public int getDigestSize() { return engine.getOutputSize(); } public int getByteLength() { return engine.getBlockSize(); } /** * Optionally initialises the Skein digest with the provided parameters.
* See {@link SkeinParameters} for details on the parameterisation of the Skein hash function. * * @param params the parameters to apply to this engine, or null to use no parameters. */ public void init(SkeinParameters params) { engine.init(params); } public void reset() { engine.reset(); } public void update(byte in) { engine.update(in); } public void update(byte[] in, int inOff, int len) { engine.update(in, inOff, len); } public int doFinal(byte[] out, int outOff) { return engine.doFinal(out, outOff); } }





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