Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.math.BigInteger;

import java.security.MessageDigest;

public class Main {
    public static byte[] halfSHA512(byte[] bytesToHash) {
        try {
            MessageDigest sha512Digest = MessageDigest.getInstance("SHA-512");
            byte[] bytesHash = sha512Digest.digest(bytesToHash);
            byte[] first256BitsOfHash = copyOf(bytesHash, 32);
            return first256BitsOfHash;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static byte[] copyOf(byte[] data, int newLength) {
        byte[] tmp = new byte[newLength];

        if (newLength < data.length) {
            System.arraycopy(data, 0, tmp, 0, newLength);
        } else {
            System.arraycopy(data, 0, tmp, 0, data.length);
        }

        return tmp;
    }

    public static char[] copyOf(char[] data, int newLength) {
        char[] tmp = new char[newLength];

        if (newLength < data.length) {
            System.arraycopy(data, 0, tmp, 0, newLength);
        } else {
            System.arraycopy(data, 0, tmp, 0, data.length);
        }

        return tmp;
    }

    public static int[] copyOf(int[] data, int newLength) {
        int[] tmp = new int[newLength];

        if (newLength < data.length) {
            System.arraycopy(data, 0, tmp, 0, newLength);
        } else {
            System.arraycopy(data, 0, tmp, 0, data.length);
        }

        return tmp;
    }

    public static long[] copyOf(long[] data, int newLength) {
        long[] tmp = new long[newLength];

        if (newLength < data.length) {
            System.arraycopy(data, 0, tmp, 0, newLength);
        } else {
            System.arraycopy(data, 0, tmp, 0, data.length);
        }

        return tmp;
    }

    public static BigInteger[] copyOf(BigInteger[] data, int newLength) {
        BigInteger[] tmp = new BigInteger[newLength];

        if (newLength < data.length) {
            System.arraycopy(data, 0, tmp, 0, newLength);
        } else {
            System.arraycopy(data, 0, tmp, 0, data.length);
        }

        return tmp;
    }
}