MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.security.DigestInputStream;
import java.security.DigestOutputStream;
import java.security.MessageDigest;
import java.security.Security;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

/**
 * Basic IO example using SHA1
 */
public class MainClass {
    public static void main(String[] args) throws Exception {
        Security.addProvider(new BouncyCastleProvider());
        byte[] input = "www.java2s.com".getBytes();
        System.out.println("input     : " + new String(input));
        MessageDigest hash = MessageDigest.getInstance("SHA1");

        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(input);
        DigestInputStream digestInputStream = new DigestInputStream(byteArrayInputStream, hash);
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

        int ch;
        while ((ch = digestInputStream.read()) >= 0) {
            byteArrayOutputStream.write(ch);
        }

        byte[] newInput = byteArrayOutputStream.toByteArray();
        System.out.println("in digest : " + new String(digestInputStream.getMessageDigest().digest()));

        byteArrayOutputStream = new ByteArrayOutputStream();
        DigestOutputStream digestOutputStream = new DigestOutputStream(byteArrayOutputStream, hash);
        digestOutputStream.write(newInput);
        digestOutputStream.close();

        System.out.println("out digest: " + new String(digestOutputStream.getMessageDigest().digest()));
    }
}