Provider.Service getAttribute() method in Java with Examples

The getAttribute() method of java.security.Provider.Service class is used to return the value of attribute for the particular attribute name passed in this method. 

Syntax:

public final String getAttribute(String name)

Return Value: This method returns value for the particular attribute type. Below are the examples to illustrate the getAttribute() method: Example 1:

Java

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

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

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

            // creating the object of Signature
            Signature sr
                = Signature.getInstance(
                    "SHA1withDSA", "SUN");

            // getting the Provider of the Signature sr
            // by using method getProvider()
            Provider provider = sr.getProvider();

            // getting the service of the provider
            // using getServices() method
            Provider.Service service
                = provider
                      .getService("Signature",
                                  sr.getAlgorithm());

            // getting attribute of Provider.Service object
            // by using getAttribute() method
            String algo = service.getAttribute("KeySize");

            // display the result
            System.out.println("KeySize is : " + algo);
        }

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

Output:

KeySize is : 1024

Example 2:

Java

// Java program to demonstrate
// getAttribute() 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");

            // getting the Provider of the Signature sr
            // by using method getProvider()
            Provider provider = msd.getProvider();

            // getting the service of the provider
            // using getServices() method
            Provider.Service service
                = provider
                      .getService("MessageDigest",
                                  msd.getAlgorithm());

            // getting attribute of Provider.Service object
            // by using getAttribute() method
            String algo
                = service.getAttribute("ImplementedIn");

            // display the result
            System.out.println("ImplementedIn : "
                               + algo);
        }

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

Output:

ImplementedIn : Software

Reference: https://docs.oracle.com/javase/9/docs/api/java/security/Provider.Service.html#getAttribute-java.lang.String-