Android Open Source - bitcoin-wallet Hash Tools

From Project

Back to project page bitcoin-wallet.

License

The source code is released under:

Copyright (C) 2011 by Caleb Anderson Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the ...

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Java Source Code

package net.dirtyfilthy.bitcoin.util;
// ww w.ja va  2 s . c om
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import net.dirtyfilthy.bouncycastle.crypto.digests.RIPEMD160Digest;
import net.dirtyfilthy.bouncycastle.jce.provider.JDKMessageDigest;

public class HashTools {
  public static MessageDigest sha256digester;
  public static MessageDigest sha1digester;
  public static MessageDigest ripemd160digester;
  

  public static byte[] sha256(byte[] toHash){
    try {
      if(sha256digester==null){
        sha256digester = MessageDigest.getInstance("SHA256");
      }
    } catch (NoSuchAlgorithmException e) {

      try {
        if(sha256digester==null){
          sha256digester = MessageDigest.getInstance("SHA-256");
        }
      } catch (NoSuchAlgorithmException e1) {
        throw new RuntimeException("Can't find SHA-256 message digest algorithm",e1);
      }
    }
    return sha256digester.digest(toHash);
  }

  public static byte[] sha1(byte[] toHash){
    try {
      if(sha1digester==null){
        sha1digester = MessageDigest.getInstance("SHA1");
      }
    } catch (NoSuchAlgorithmException e) {

      try {
        if(sha1digester==null){
          sha1digester = MessageDigest.getInstance("SHA-1");
        }
      } catch (NoSuchAlgorithmException e1) {
        throw new RuntimeException("Can't find SHA-1 message digest algorithm",e1);
      }
    }
    return sha1digester.digest(toHash);
  }

  public static byte[] doubleSha256(byte[] toHash){
    return sha256(sha256(toHash));
  }

  public static byte[] hash160(byte[] toHash){
    return ripemd160(sha256(toHash));
  }

  public static byte[] ripemd160(byte[] toHash){
    if(ripemd160digester==null){  
      ripemd160digester = new  JDKMessageDigest.RIPEMD160();
    }
    return ripemd160digester.digest(toHash);
  }

  public static byte[] reverseByteArray(byte[] a) {
    byte[] b=a.clone();
    int left  = 0;          // index of leftmost element
    int right = b.length-1; // index of rightmost element

    while (left < right) {
      // exchange the left and right elements, the old xor byte swap
      b[left]  = (byte) (b[left] ^ b[right]); 
      b[right] = (byte) (b[left] ^ b[right]); 
      b[left]  = (byte) (b[left] ^ b[right]); 

      // move the bounds toward the center
      left++;
      right--;
    }
    return b;
  }

}

Java Source Code List