I need help completing my assignment for COMP2300: Applied Cryptography. There are two parts that...

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I need help completing my assignment for COMP2300: Applied Cryptography. There are two parts that need to be completed. Part 1 is a little exercise based on attacking a hash function. The expert will need to create a class called JHTest, then paste the following code into it and answer two questions related to part 1. Part 2 is calculating a digest over a file. Part 2 requires completing the program by filling the missing code which initiates objects of the right classes and then calls the appropriate method calls. The expert will then need to answer question 3, 4, and 5 related to part 2. All the information related to the assignment is inCOMP2300_SHFYR_2021_ALL_U_ Assignment 1 - File Digests with the Java Cryptography Architecture. The questions for both part 1 and 2 need to be answered in Assignment1.txt. FileProperty needs to be imported into Eclipse.

Vibhav · Accepted Answer

Hmacsha256/1.PNG
Hmacsha256/2.PNG
Hmacsha256/FileProperty.java
Hmacsha256/FileProperty.java
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.Key;
/**
 * Program to calculate a security property of a file, 
 * consisting of SHA3-256 (or other) digest over the file, 
 * prefixed with a shared secret
 */
/**
 * @author  
 *
 */
public class FileProperty {
    
    private static final String progName = "FileProperty";      // Name of the program
    private static final int bufSize = 512;                 // Almost any sensible value will work here
    /**
     * @param args
     */
    public static void main(String[] args) {
        
        BufferedInputStream in = null;          // A buffered input stream to read from
        byte[] inputBuffer = new byte[bufSize]; // A buffer for the input read from the file
        int bytesRead = 0;                      // Number of bytes read into the input file buffer
        byte[] messageDigest = null;            // A variable for the actual digest value, as an array of bytes
        
        // First, check the user has provided all the required arguments, and if they haven't, tell them then exit
        if(args.length != 2) {
            printUsageMessage(); System.exit(1);

I need help completing my assignment for COMP2300: Applied Cryptography. There are two parts that need to be completed. Part 1 is a little exercise based on attacking a hash function. The expert will...

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