Método MessageDigest isEqual() en Java con ejemplos

El método isEqual() de la clase java.security.MessageDigest se usa para probar si dos resúmenes de mensajes son iguales o no.
 

Sintaxis:  

public static boolean
  isEqual(byte[] digesta, byte[] digestb)

Parámetros: este método toma arrays de 2 bytes para comparar.
Valor de retorno: este método proporciona el valor booleano, verdadero si ambos resúmenes son iguales; de lo contrario, falso.
 

A continuación se muestran los ejemplos para ilustrar el método isEqual():
Ejemplo 1: para valores de resumen iguales  

// Java program to demonstrate
// isEqual() method
 
import java.security.*;
import java.util.*;
 
public class GFG1 {
    public static void main(String[] argv)
    {
        try {
 
            // creating object of MessageDigest
            MessageDigest msd1
                = MessageDigest.getInstance("SHA-256");
 
            // creating object of MessageDigest
            MessageDigest msd2
                = MessageDigest.getInstance("SHA-256");
 
            // getting provider used in object msd
            // using getAlgorithm() method
            boolean status
                = MessageDigest
                      .isEqual(msd1.digest(),
                               msd2.digest());
 
            // check the condition
            if (status)
                System.out.println("msd1 is equals to msd2");
            else
                System.out.println("msd1 is not equals to msd2");
        }
 
        catch (NoSuchAlgorithmException e) {
 
            System.out.println("Exception thrown : " + e);
        }
        catch (ProviderException e) {
 
            System.out.println("Exception thrown : " + e);
        }
    }
}

msd1 is equals to msd2

Ejemplo 2: para valores de resumen desiguales 

// Java program to demonstrate
// isEqual() method
 
import java.security.*;
import java.util.*;
 
public class GFG1 {
    public static void main(String[] argv)
    {
        try {
 
            // creating object of MessageDigest
            MessageDigest msd1
                = MessageDigest.getInstance("MD5");
 
            // creating object of MessageDigest
            MessageDigest msd2
                = MessageDigest.getInstance("SHA-256");
 
            // getting provider used in object msd
            // using getAlgorithm() method
            boolean status
                = MessageDigest.isEqual(msd1.digest(),
                                        msd2.digest());
 
            // check the condition
            if (status)
                System.out.println("msd1 is equals to msd2");
            else
                System.out.println("msd1 is not equals to msd2");
        }
 
        catch (NoSuchAlgorithmException e) {
 
            System.out.println("Exception thrown : " + e);
        }
        catch (ProviderException e) {
 
            System.out.println("Exception thrown : " + e);
        }
    }
}

msd1 is not equals to msd2

Referencia: https://docs.oracle.com/javase/9/docs/api/java/security/MessageDigest.html#isEqual-byte:A-byte:A-