MessageDigest isEqual() method in Java with Examples

29 Jul, 2021
The isEqual() method of java.security.MessageDigest class is used to test if two message digest are equal or not. 
Syntax:  
public static boolean
  isEqual(byte[] digesta, byte[] digestb)
Parameters: This method takes 2 byte arrays for comparison.Return Value: This method provides the Boolean value, true if both digests are equal otherwise false. 
Below are the examples to illustrate the isEqual() method:Example 1: For Equal Digest Values  
Java
// 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
 
Example 2: For Unequal Digest Values 
Java
// 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
 
Reference: https://docs.oracle.com/javase/9/docs/api/java/security/MessageDigest.html#isEqual-byte:A-byte:A-
manikarora059
Java-Functions
Java-MessageDigest
Java-security package
Java
Java
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