MessageDigest reset() method in Java with Examples

Photo of Namachila Namachila Send an email 2 weeks ago
0 1 2 minutes read

The reset() method of java.security.MessageDigest class is used to reset current message digest value to default message digest value of this MessageDisgest object.
Syntax: 
 

public void reset()

Return Value: This method has nothing to return.
Below are the examples to illustrate the reset() method:
Example 1: 
 

Java




// Java program to demonstrate
// reset() method
 
import java.security.*;
import java.nio.*;
import java.util.*;
 
public class GFG1 {
    public static void main(String[] argv)
    {
        try {
 
            byte[] barr = { 10, 20, 30, 40 };
 
            // creating object of MessageDigest
            MessageDigest msd1
                = MessageDigest.getInstance("MD5");
 
            // display the digest value before Updation
            System.out.println("MessageDigest before update : "
                               + (ByteBuffer.wrap(
                                      msd1.digest()))
                                     .getShort());
 
            // creating object of ByteBuffer
            // and allocating size capacity
            ByteBuffer bb = ByteBuffer.wrap(barr);
 
            // update MessageDigest value
            // using update() method
            msd1.update(bb);
 
            // display the digest value before Updation
            System.out.println("\nMessageDigest after update : "
                               + (ByteBuffer.wrap(
                                      msd1.digest()))
                                     .getShort());
 
            // reset MessageDigest value
            // using reset() method
            msd1.reset();
 
            // display the digest value after reset
            System.out.println("\nMessageDigest after reset : "
                               + (ByteBuffer.wrap(
                                      msd1.digest()))
                                     .getShort());
        }
 
        catch (NoSuchAlgorithmException e) {
 
            System.out.println("Exception thrown : " + e);
        }
        catch (ProviderException e) {
 
            System.out.println("Exception thrown : " + e);
        }
    }
}
 

















Output: 


MessageDigest before update : -11235

MessageDigest after update : 30835

MessageDigest after reset : -11235


 




Example 2: 
 








Java

















































// Java program to demonstrate


// reset() method


 


import java.security.*;


import java.nio.*;


import java.util.*;


 


public class GFG1 {


    public static void main(String[] argv)


    {


        try {


 


            byte[] barr = { 10, 20, 30, 40 };


 


            // creating object of MessageDigest


            MessageDigest msd1


                = MessageDigest.getInstance("SHA-256");


 


            // display the digest value before Updation


            System.out.println("MessageDigest before update : "


                               + (ByteBuffer.wrap(


                                      msd1.digest()))


                                     .getShort());


 


            // creating object of ByteBuffer


            // and allocating size capacity


            ByteBuffer bb = ByteBuffer.wrap(barr);


 


            // update MessageDigest value


            // using update() method


            msd1.update(bb);


 


            // display the digest value before Updation


            System.out.println("\nMessageDigest after update : "


                               + (ByteBuffer.wrap(


                                      msd1.digest()))


                                     .getShort());


 


            // reset MessageDigest value


            // using reset() method


            msd1.reset();


 


            // display the digest value after reset


            System.out.println("\nMessageDigest after reset : "


                               + (ByteBuffer.wrap(


                                      msd1.digest()))


                                     .getShort());


        }


 


        catch (NoSuchAlgorithmException e) {


 


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


        }


        catch (ProviderException e) {


 


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


        }


    }


}






































Output: 


MessageDigest before update : -7248

MessageDigest after update : 24403

MessageDigest after reset : -7248


 




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






			
		


				

			

				

						
							Photo of Namachila
						
					Namachila
						
							
							Send an email
						
					2 weeks ago
0 1  2 minutes read 


		

					

		


		

		

		

		
	


	
	


		
		


								

						
							Photo of Namachila						
					

					
			


											
Namachila

						
				

									


							

			

		

		


	





			

			
			

			

	

				


					

						
Related Articles

					


					


					
							


								
			
								
Closest pair in an Array such that one number is multiple of the other


								
1 minute ago
							


						
							


								
			
								
Permutation of first N positive integers such that prime numbers are at prime indices | Set 2


								
1 minute ago
							


						
							


								
			
								
Nth term of a Custom Fibonacci series


								
2 minutes ago
							


						
							


								
			
								
Find integral points with minimum distance from given set of integers using BFS


								
2 minutes ago
							


						
					

				


				


		

		
	

		
Leave a Reply 
Your email address will not be published. Required fields are marked *
 
 



 


 


 


	

	

	



	


	




	

	
	
	






		

		
		
			
			Back to top button