JavaExercises/Experiments/SHA512.java at master · biblelamp/JavaExercises · GitHub

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// Java program to calculate SHA-512 hash value

import java.math.BigInteger;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

public class SHA512 {

public static String encryptThisString(String input) {

try {

// getInstance() method is called with algorithm SHA-512

MessageDigest md = MessageDigest.getInstance("SHA-512");

// digest() method is called

// to calculate message digest of the input string

// returned as array of byte

byte[] messageDigest = md.digest(input.getBytes());

// Convert byte array into signum representation

BigInteger no = new BigInteger(1, messageDigest);

// Convert message digest into hex value

String hashtext = no.toString(16);

// Add preceding 0s to make it 32 bit

while (hashtext.length() < 32) {

hashtext = "0" + hashtext;

}

// return the HashText

return hashtext;

}

// For specifying wrong message digest algorithms

catch (NoSuchAlgorithmException e) {

throw new RuntimeException(e);

}

public static void main(String args[]) throws NoSuchAlgorithmException {

System.out.println("HashCode Generated by SHA-512 for:");

String s1 = "GeeksForGeeks";

System.out.println("\n" + s1 + ":\n" + encryptThisString(s1));

String s2 = "hello world";

System.out.println("\n" + s2 + ":\n" + encryptThisString(s2));

}

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