MessageDigest getAlgorithm() method in Java with Examples

The method getAlgorithm() of java.security.MessageDigest class is used to return the standard name of the algorithm this message digest is associated with.

Syntax:

public final String getAlgorithm()

Return Value: This method returns the algorithm used in message digest.

Below are the examples to illustrate the getAlgorithm() method:

Example 1:

// Java program to demonstrate
// getAlgorithm() method

import java.security.*;
import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
    {
        try {

            // creating object of MessageDigest
            MessageDigest msd
                = MessageDigest.getInstance("MD5");

            // get the name of algorithm
            // used in MessageDigest
            // using getAlgorithm() method
            String algo = msd.getAlgorithm();

            // printing the string algo
            System.out.println("Algorithm : " + algo);
        }

        catch (NoSuchAlgorithmException e) {

            System.out.println("Exception thrown : " + e);
        }
        catch (ProviderException e) {

            System.out.println("Exception thrown : " + e);
        }
    }
}

Output:

Algorithm : MD5

Example 2:

// Java program to demonstrate
// getAlgorithm() method

import java.security.*;
import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
    {
        try {
            // creating object of MessageDigest
            MessageDigest msd
                = MessageDigest.getInstance("SHA-256");

            // get the name of algorithm used in MessageDigest
            // using getAlgorithm() method
            String algo = msd.getAlgorithm();

            // printing the string algo
            System.out.println("Algorithm : " + algo);
        }

        catch (NoSuchAlgorithmException e) {

            System.out.println("Exception thrown : " + e);
        }
        catch (ProviderException e) {

            System.out.println("Exception thrown : " + e);
        }
    }
}

Output:

Algorithm : SHA-256

Reference: https://docs.oracle.com/javase/9/docs/api/java/security/MessageDigest.html#getAlgorithm–