Java SHA-256 hackerrank Solution

Java SHA-256 hackerrank Solution

Cryptographic hash functions are mathematical operations run on digital data; by comparing the computed hash (i.e., the output produced by executing a hashing algorithm) to a known and expected hash value, a person can determine the data’s integrity. For example, computing the hash of a downloaded file and comparing the result to a previously published hash result can show whether the download has been modified or tampered with. In addition, cryptographic hash functions are extremely collision-resistant; in other words, it should be extremely difficult to produce the same hash output from two different input values using a cryptographic hash function.

Secure Hash Algorithm 2 (SHA-2) is a set of cryptographic hash functions designed by the National Security Agency (NSA). It consists of six identical hashing algorithms (i.e., SHA-256, SHA-512, SHA-224, SHA-384, SHA-512/224, SHA-512/256) with a variable digest size. SHA-256 is a 256-bit (32 byte) hashing algorithm which can calculate a hash code for an input of up to 264-1 bits. It undergoes 64 rounds of hashing and calculates a hash code that is a 64-digit hexadecimal number.

Given a string, , print its SHA-256 hash value.

Input Format

A single alphanumeric string denoting s.

Constraints

• 6<=|s|<=20
• String  consists of English alphabetic letters (i.e., [a-zA-Z] and/or decimal digits (i.e., 0 through 9) only.

Output Format

Print the SHA-256 encryption value of s on a new line.

Sample Input 0

HelloWorld

Sample Output 0

872e4e50ce9990d8b041330c47c9ddd11bec6b503ae9386a99da8584e9bb12c4

Code Solution:

//Java SHA-256 hackerrank Solution

import java.io.*;
import java.util.*;
import java.security.*;

public class Solution {

        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String key = scanner.next();
        try{
        MessageDigest md = MessageDigest.getInstance("SHA-256");
            md.update(key.getBytes());
        
        byte[] digest = md.digest();
        
        StringBuffer stringbuffer = new StringBuffer();
        for (byte b: digest)
        {  // needed to print it in hexadecimal format
            stringbuffer.append(String.format("%02x", b));
        }
        
        System.out.println(stringbuffer.toString());
        
        }
        
        catch (NoSuchAlgorithmException exception)
        {
            System.out.println(exception);
        }
    }
    }
//Java SHA-256 hackerrank Solution

Disclaimer: This problem is originally created and published by HackerRank, we only provide solutions to this problem. Hence, doesn’t guarantee the truthfulness of the problem. This is only for information purposes.