MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.security.DigestInputStream;
import java.security.DigestOutputStream;
import java.security.MessageDigest;

public class MainClass {
    public static void main(String[] args) throws Exception {
        performOutputTest();
        performInputTest();
    }

    static void performOutputTest() throws Exception {
        MessageDigest md = MessageDigest.getInstance("SHA");
        FileOutputStream fout = new FileOutputStream("sha-results.txt");
        DigestOutputStream out = new DigestOutputStream(fout, md);
        byte[] b = "testCase".getBytes();
        out.write(b, 0, b.length);
        md = out.getMessageDigest();
        String s = new String(md.digest());
        System.out.println("Calculated result: " + s);
    }

    static void performInputTest() throws Exception {
        MessageDigest md = MessageDigest.getInstance("SHA");
        FileInputStream fin = new FileInputStream("sha-results.txt");
        DigestInputStream in = new DigestInputStream(fin, md);
        byte[] b = new byte["testCase".getBytes().length];
        in.read(b, 0, "testCase".getBytes().length);
        md = in.getMessageDigest();
        String s = new String(md.digest());
        System.out.println("Calculated result:  " + s);
    }
}