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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;


/**
 * implementation of SHA-3 based on following KeccakNISTInterface.c from http://keccak.noekeon.org/
 * 

* Following the naming conventions used in the C source code to enable easy review of the implementation. */ public class SHA3Digest extends KeccakDigest { private static int checkBitLength(int bitLength) { switch (bitLength) { case 224: case 256: case 384: case 512: return bitLength; default: throw new IllegalArgumentException("'bitLength' " + bitLength + " not supported for SHA-3"); } } public SHA3Digest() { this(256); } public SHA3Digest(int bitLength) { super(checkBitLength(bitLength)); } public SHA3Digest(SHA3Digest source) { super(source); } public String getAlgorithmName() { return "SHA3-" + fixedOutputLength; } public int doFinal(byte[] out, int outOff) { absorb(new byte[]{ 0x02 }, 0, 2); return super.doFinal(out, outOff); } /* * TODO Possible API change to support partial-byte suffixes. */ protected int doFinal(byte[] out, int outOff, byte partialByte, int partialBits) { if (partialBits < 0 || partialBits > 7) { throw new IllegalArgumentException("'partialBits' must be in the range [0,7]"); } int finalInput = (partialByte & ((1 << partialBits) - 1)) | (0x02 << partialBits); int finalBits = partialBits + 2; if (finalBits >= 8) { oneByte[0] = (byte)finalInput; absorb(oneByte, 0, 8); finalBits -= 8; finalInput >>>= 8; } return super.doFinal(out, outOff, (byte)finalInput, finalBits); } }





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