HackerRank Java- SHA-256

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.

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

  1. import java.util.Scanner;
  2. import java.security.MessageDigest;
  3. import java.security.NoSuchAlgorithmException;
  4. public class Solution {
  5. public static void main(String[] args) throws NoSuchAlgorithmException {
  6. Scanner scan = new Scanner(System.in);
  7. String str = scan.next();
  8. scan.close();
  9. /* Encode the String using SHA-256 */
  10. MessageDigest md = MessageDigest.getInstance("SHA-256");
  11. md.update(str.getBytes());
  12. byte[] digest = md.digest();
  13. /* Print the encoded value in hexadecimal */
  14. for (byte b : digest) {
  15. System.out.format("%02x", b);
  16. }
  17. }
  18. }
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