Android Open Source - My-Wallet-Android Hash

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License

The source code is released under:

GNU General Public License

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Java Source Code

/*
 * Copyright 2011-2012 the original author or authors.
 */*from w w  w  .ja v a  2  s . co m*/
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package piuk;

import java.io.Serializable;
import java.util.Arrays;

import org.apache.commons.lang.ArrayUtils;

import com.google.bitcoin.bouncycastle.util.encoders.Hex;

public class Hash implements Serializable {
  private static final long serialVersionUID = 1L;
  private final byte[] hash;

  public Hash() { this.hash = null; }
  public Hash(String hex) {
    this.hash = Hex.decode(hex);
  }
  
  public Hash(byte[] bytes) {
    this.hash = bytes;
  }
  
  public void reverse() {
    ArrayUtils.reverse(hash);
  }

  public byte[] getBytes() {
    return hash;
  }

  public int nLeadingZeros() {
    int n = 0;
    
    for (byte b : hash) {
      if (b == 0) 
        n += 8;
      else {
        n += Math.max(0, Integer.numberOfLeadingZeros(b) - (3*8));        
        break;
      }
    }

    return n;
  }
  
  public boolean isNull() {
    if (hash == null || hash.length == 0)
      return true;

    for (byte b : hash) {
      if (b != 0) return false;
    }

    return true;
  }
  
  @Override
  public String toString() {
    
    if (hash == null)
      return null;
    
    return new String(Hex.encode(hash));
  }
  
  @Override
  public int hashCode() {
    return Arrays.hashCode(hash);
  }
  
  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    Hash other = (Hash) obj;
    if (!Arrays.equals(hash, other.hash))
      return false;
    return true;
  }
}

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