S H A256 HackerRank Solution

In the realm of data security, hashing is a crucial technique. It transforms an input (or 'message') into a fixed-size string of bytes, which typically looks like a random sequence of characters. The 'message' can be of any length but the 'hash' has a fixed length. This program is about generating the SHA-256 hash, a specific type of hash, of a given string in Java.

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Here is the S H A256 HackerRank Solution HackerRank solution using CodeRankGPT:

The program uses Java's built-in MessageDigest class to generate the SHA-256 hash. It first reads a string from the user. Then, it calls the getSHAHEX method, which creates an instance of MessageDigest with the SHA-256 algorithm. The method then converts the string into bytes and feeds it to the digest. The digest, in turn, generates the hash. The hash is a byte array, so the method converts each byte into a hexadecimal string and appends them together to form the final hash string. If any hexadecimal string is of length 1, it prepends a '0' to it to ensure that every byte is represented by two hexadecimal characters.


/**
 * 
 */
package com.javaaid.hackerrank.solutions.languages.java.advanced;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Scanner;

/**
 *
 */
public class JavaSHA256 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		System.out.println(getSHAHEX(s));
		sc.close();
	}

	private static String getSHAHEX(String s) {
		StringBuffer sb = new StringBuffer();
		try {
			MessageDigest digest = MessageDigest.getInstance("SHA-256");
			byte[] result = digest.digest(s.getBytes());
			for (int i = 0; i < result.length; i++) {
				String hex = Integer.toHexString(0xff & result[i]);
				if (hex.length() == 1)
					sb.append('0');
				sb.append(hex);
			}

		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}

		return sb.toString();
	}

}

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