Algorithm
Problem Name:
In this HackerRank Functions in Java programming problem 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, s, print its SHA-256 hash value.
Input Format
A single alphanumeric string denoting s.
Constraints
- 6 <= |s| <=20
- String s consists of English alphabetic letters (i.e., [a - zA - A] 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
Sample Input 1
Javarmi123
Sample Output 1
f1d5f8d75bb55c777207c251d07d9091dc10fe7d6682db869106aacb4b7df678
Code Examples
#1 Code Example with Java Programming
Code -
Java Programming
import java.util.Scanner;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class Solution {
public static void main(String[] args) throws NoSuchAlgorithmException {
/* Read and save the input String */
Scanner scan = new Scanner(System.in);
String str = scan.next();
scan.close();
/* Encode the String using SHA-256 */
MessageDigest md = MessageDigest.getInstance("SHA-256");
md.update(str.getBytes());
byte[] digest = md.digest();
/* Print the encoded value in hexadecimal */
for (byte b : digest) {
System.out.format("%02x", b);
}
}
}