CNS Lab Exercise-10

 EXERCISE-10

Calculate the message digest of a text using the SHA-1 algorithm in JAVA.

import java.security.MessageDigest;

import java.util.Scanner;

public class SHA1UserInput {

    public static void main(String[] args) {

        try {

            Scanner sc = new Scanner(System.in);

            // User input

            System.out.print("Enter text: ");

            String text = sc.nextLine();

            // SHA-1 MessageDigest object

            MessageDigest md = MessageDigest.getInstance("SHA-1");

            // Generate hash

            byte[] hashBytes = md.digest(text.getBytes());

            // Convert bytes to hex

            StringBuilder sb = new StringBuilder();

            for (byte b : hashBytes) {

                sb.append(String.format("%02x", b));

            }

            // Output

            System.out.println("Original Text: " + text);

            System.out.println("SHA-1 Message Digest: " + sb.toString());

        } catch (Exception e) {

            System.out.println("Error: " + e);

        }

    }

}

Sample Output:

Enter text: hello

Original Text: hello

SHA-1 Message Digest: aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d