Coverage Summary for Class: Keccak256Helper (org.ethereum.crypto)

Class Method, % Line, %
Keccak256Helper 15.8% (3/19) 17.1% (7/41)
Keccak256Helper$Size 0% (0/3) 0% (0/9)
Total 13.6% (3/22) 14% (7/50)


1 /* 2  * This file is part of RskJ 3  * Copyright (C) 2017 RSK Labs Ltd. 4  * (derived from ethereumJ library, Copyright (c) 2016 <ether.camp>) 5  * 6  * This program is free software: you can redistribute it and/or modify 7  * it under the terms of the GNU Lesser General Public License as published by 8  * the Free Software Foundation, either version 3 of the License, or 9  * (at your option) any later version. 10  * 11  * This program is distributed in the hope that it will be useful, 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14  * GNU Lesser General Public License for more details. 15  * 16  * You should have received a copy of the GNU Lesser General Public License 17  * along with this program. If not, see <http://www.gnu.org/licenses/>. 18  */ 19  20 package org.ethereum.crypto; 21  22 import org.bouncycastle.crypto.digests.KeccakDigest; 23 import org.bouncycastle.util.encoders.Hex; 24 import org.ethereum.util.ByteUtil; 25  26 import java.math.BigInteger; 27  28 public class Keccak256Helper { 29  30  public static final int DEFAULT_SIZE = 256; 31  public static final int DEFAULT_SIZE_BYTES = DEFAULT_SIZE / 8; 32  33  public static String keccak256String(String message) { 34  return keccak256String(message, new KeccakDigest(DEFAULT_SIZE), true); 35  } 36  37  public static String keccak256String(byte[] message) { 38  return keccak256String(message, new KeccakDigest(DEFAULT_SIZE), true); 39  } 40  41  public static byte[] keccak256(String message) { 42  return keccak256(Hex.decode(message), new KeccakDigest(DEFAULT_SIZE), true); 43  } 44  45  public static byte[] keccak256(byte[] message) { 46  return keccak256(message, new KeccakDigest(DEFAULT_SIZE), true); 47  } 48  49  public static byte[] keccak256(byte[] message, Size sz) { 50  return keccak256(message, new KeccakDigest(sz.bits), true); 51  } 52  53  public static byte[] keccak256(byte[] m1, byte[] m2) { 54  return keccak256(m1, m2, new KeccakDigest(DEFAULT_SIZE), true); 55  } 56  57  public static byte[] keccak256(byte[] message, int start, int length) { 58  return keccak256(message, start, length, new KeccakDigest(DEFAULT_SIZE), true); 59  } 60  61  protected static String keccak256String(String message, Size bitSize) { 62  KeccakDigest digest = new KeccakDigest(bitSize.bits); 63  return keccak256String(message, digest, true); 64  } 65  66  protected static String keccak256String(byte[] message, Size bitSize) { 67  KeccakDigest digest = new KeccakDigest(bitSize.bits); 68  return keccak256String(message, digest, true); 69  } 70  71  protected static String keccak256String(String message, Size bitSize, boolean bouncyencoder) { 72  KeccakDigest digest = new KeccakDigest(bitSize.bits); 73  return keccak256String(message, digest, bouncyencoder); 74  } 75  76  protected static String keccak256String(byte[] message, Size bitSize, boolean bouncyencoder) { 77  KeccakDigest digest = new KeccakDigest(bitSize.bits); 78  return keccak256String(message, digest, bouncyencoder); 79  } 80  81  private static String keccak256String(String message, KeccakDigest digest, boolean bouncyencoder) { 82  if (message != null) { 83  return keccak256String(Hex.decode(message), digest, bouncyencoder); 84  } 85  throw new NullPointerException("Can't hash a NULL value"); 86  } 87  88  private static String keccak256String(byte[] message, KeccakDigest digest, boolean bouncyencoder) { 89  byte[] hash = doKeccak256(message, digest, bouncyencoder); 90  if (bouncyencoder) { 91  return ByteUtil.toHexString(hash); 92  } else { 93  BigInteger bigInt = new BigInteger(1, hash); 94  return bigInt.toString(16); 95  } 96  } 97  98  private static byte[] keccak256(byte[] message, KeccakDigest digest, boolean bouncyencoder) { 99  return doKeccak256(message, digest, bouncyencoder); 100  } 101  102  private static byte[] keccak256(byte[] m1, byte[] m2, KeccakDigest digest, boolean bouncyencoder) { 103  return doKeccak256(m1, m2, digest, bouncyencoder); 104  } 105  106  private static byte[] keccak256(byte[] message, int start, int length, KeccakDigest digest, boolean bouncyencoder) { 107  byte[] hash = new byte[digest.getDigestSize()]; 108  109  if (message.length != 0) { 110  digest.update(message, start, length); 111  } 112  digest.doFinal(hash, 0); 113  return hash; 114  } 115  116  117  private static byte[] doKeccak256(byte[] message, KeccakDigest digest, boolean bouncyencoder) { 118  byte[] hash = new byte[digest.getDigestSize()]; 119  120  if (message.length != 0) { 121  digest.update(message, 0, message.length); 122  } 123  digest.doFinal(hash, 0); 124  return hash; 125  } 126  127  private static byte[] doKeccak256(byte[] m1, byte[] m2, KeccakDigest digest, boolean bouncyencoder) { 128  byte[] hash = new byte[digest.getDigestSize()]; 129  digest.update(m1, 0, m1.length); 130  digest.update(m2, 0, m2.length); 131  132  digest.doFinal(hash, 0); 133  return hash; 134  } 135  136  public enum Size { 137  138  S224(224), 139  S256(256), 140  S384(384), 141  S512(512); 142  143  int bits = 0; 144  145  Size(int bits) { 146  this.bits = bits; 147  } 148  149  public int getValue() { 150  return this.bits; 151  } 152  } 153  154 }