Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.io.IOException;
import java.io.InputStream;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    private static final char[] hexDigits = "0123456789abcdef".toCharArray();

    public static String hashStream(InputStream in, String hash) throws IOException {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance(hash);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        int bsize = 4096;
        byte[] buffer = new byte[bsize];
        int length;

        while ((length = in.read(buffer, 0, bsize)) > 0) {
            md5.update(buffer, 0, length);
        }

        return toHex(md5.digest());
    }

    public static String hashStream(InputStream in) throws IOException {
        return hashStream(in, "MD5");
    }

    public static String toHex(byte[] arr) {
        final char[] str = new char[arr.length * 2];

        for (int i = 0; i < arr.length; i++) {
            final int v = arr[i] & 0xff;
            str[2 * i] = hexDigits[v >>> 4];
            str[2 * i + 1] = hexDigits[v & 0x0f];
        }

        return new String(str);
    }
}