MessageDigest NoSuchAlgorithmException

Question

I want to use MessageDigest to get a MD5 hash, but I get an error.

import java.security.MessageDigest;

public class dn {
  public static void main(         


        

Answer 1

In addition to other answers here

Certain algorithms would not be available with some JVM

To make it truly portable application you should do this

public boolean isMDAvailable(String s)
{
    boolean success=true;
    try{MessageDigest.GetInstance(s);}
    catch(NoSuchAlgorithmException x)
    {
         success=false;
    }
    return success;
}

Now you can get any available MD algorithm with this method

public MessageDigest getAvailableMessageDigest()
{
    if(isMDAvailable("MD5")==true)return MessageDigest.GetInstance("MD5");
    else if(isMDAvailable("MD2")==true)return MessageDigest.GetInstance("MD2");
    else if(isMDAvailable("SHA-512")==true)return MessageDigest.GetInstance("SHA-512");
    else return null;
}