H({ username-value,":", realm-value, ":", passwd }). 

/**
 * 
 * SaslDigestMD5JndiClient.java
 * Sample code to explore how and when DIGEST-MD5 authentication works.
 * 
 */
 
import java.util.Hashtable;
import javax.naming.directory.*;
import javax.naming.*;
 
public class SaslDigestMD5JndiClient
{
    public static void main (String[] args)
    {
        String bind_dn       = "testuser";
        String bind_password = "secret";
        String init_url      = "ldap://myserver.mydomain.com:389";
    
        Hashtable env = new Hashtable();
        env.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
        env.put(Context.PROVIDER_URL, init_url);
        
        // Set the authentication mechanism to be DIGEST-MD5
        env.put(Context.SECURITY_AUTHENTICATION, "DIGEST-MD5");
        env.put(Context.SECURITY_PRINCIPAL, bind_dn);
        env.put(Context.SECURITY_CREDENTIALS, bind_password);
        /*
         * other environment properties are: 
         * javax.security.sasl.qop:  
         *    specifies list of qops:  "auth", "auth-int", "auth-conf"
         *    auth      -- authentication only;
         *    auth-int  -- authentication & subsequent message's integrity check
         *    auth-conf -- authentication & subsequent message's 
         *                 confidentiality enforcement
         *    default is "auth" 
         *    env.put("javax.security.sasl.qop", "auth");
         * javax.security.sasl.strength 
         *    specifies low/medium/high strength of encryption; 
         *    default is all available ciphers [high,medium,low]; 
         *    high means des3 or rc4 (128); medium des or rc4-56; low is rc4-40. 
         *    env.put("javax.security.sasl.strength","high");
         * javax.security.sasl.maxbuf 
         *    specifies max receive buf size; default is 65536 
         * javax.security.sasl.sendmaxbuffer 
         *    specifies max send buf size; default is 65536 
         */
        
        DirContext ctx = null;
        try {
            // Create the initial directory context
            ctx = new InitialDirContext(env);
        } catch (Exception e) {
            System.err.println("Authentication failed: " + e);
        }
        
        try{
            
            // Create the search controls         
            SearchControls searchCtls = new SearchControls();
            
            //Specify the attributes to return
            String returnedAtts[]={"sn","givenName","mail"};
            searchCtls.setReturningAttributes(returnedAtts);
            
            //Specify the search scope
            searchCtls.setSearchScope(SearchControls.SUBTREE_SCOPE);
 
            //specify the LDAP search filter
            String searchFilter = "(&(objectClass=user)(mail=*))";
 
            //Specify the Base for the search
            String searchBase = "dc=mydomain,dc=com";
 
            // Search for objects using the filter
            NamingEnumeration results = ctx.search(searchBase,searchFilter,searchCtls);
 
            //Loop through the search results
            while (results.hasMoreElements()) {
                SearchResult sr = (SearchResult)results.next();
                System.out.println("dn: " + sr.getName());
                 Attributes attrs = sr.getAttributes();
                System.out.println("attributes: " + attrs);
             }
            
             ctx.close();
 
        } catch (NamingException e) {
            System.err.println("Searching failed: " + e);
        }
    }
}