package com.enterprisej2me.HttpConnections; import javax.microedition.io.*;// How do I update count for every request?// HttpClient seem to only update count when a 401 is returned?public class DigestAuthHandler implements Handler {   private String username;  private String password;  private String httpMethod;  private String uri;  private String realm;  private String nonce;  private String count;  private String cnonce;  private String qop;  private String opaque;  private String algor;  private boolean stale;  private int ncount;  public DigestAuthHandler (String u, String p) {    username = u;    password = p;  }   public void prepareHeaders(HttpConnection c) throws Exception {    String h = "Digest ";    if(username != null)      h = h + "username=\"" + username + "\", ";    if(realm != null)      h = h + "realm=\"" + realm + "\", ";    if(nonce != null)      h = h + "nonce=\"" + nonce + "\", ";    if(uri != null)      h = h + "uri=\"" + uri + "\", ";    if(opaque != null)      h = h + "opaque=\"" + opaque + "\", ";    if(qop != null) {      h = h + "qop=\"" + qop + "\", ";      // cnonce and nonce-count are required if qop is present.      //      // cnonce is a random number generated by the client.      // You should use your device build-in random number      // generator to produce it.      cnonce = "0123456789";      h = h + "cnonce=\"" + cnonce + "\", ";      h = h + "nc=" + count + ", ";      // Increase counter by one.      // The counter will be reset when a new nonce comes in.      ncount++;      String nc = Integer.toHexString(ncount);      count = new String("00000000").substring(nc.length()) + nc;    }// For some reason, apache sends back algorithm "D".// MD5 is assumed here.//    if(algor != null)//      h = h + "algorithm=\"" + algor + "\", ";//    else      h = h + "algorithm=\"MD5\", ";    h = h + "response=\"" + getDigest() + "\"";    c.setRequestProperty("Authorization", h);  }   public boolean processHeaders (HttpConnection c) throws Exception {    if ( c.getResponseCode() == 401 ) {      httpMethod = c.getRequestMethod();      uri = c.getFile();      parse (c.getHeaderField("WWW-Authenticate"));      // need to re-send request      return true;    } else {      return false;    }  }  private void parse (String header) {    int i, j;    String propvalue, prop, value;    // Get rid of string "Digest"    i = header.indexOf(" ");    header = header.substring(i+1).trim();    while ( (i = header.indexOf(",")) != -1 ) {      propvalue = header.substring(0, i).trim();      header = header.substring(i+1).trim();      j = propvalue.indexOf("=");      prop = propvalue.substring(0, j).toLowerCase();      value = propvalue.substring(j+1).trim();      // Get rid of quote marks      value = value.substring(1, value.length() - 1);       if(prop.compareTo("qop") == 0)        qop = value;      else if(prop.compareTo("nonce") == 0)        setNonce(value);      else if(prop.compareTo("realm") == 0)        realm = value;      else if(prop.compareTo("opaque") == 0)        opaque = value;      else if(prop.compareTo("algorithm") == 0)        algor = value;    }  }  private void setNonce(String n) {    // If this is a new nonce, reset counter    String c;    if(nonce == null) ncount = 1;    else if(n.compareTo(nonce) != 0) ncount = 1;    // else ncount++;    c = Integer.toHexString(ncount);    count = new String("00000000").substring(c.length()) + c;    nonce = n;  }  private String getDigest () {    String plaintext;    String A1, A2;    if (username == null || password == null ||         realm == null || uri == null ||         nonce == null)       return "";    if (username.length() == 0 || password.length() == 0 ||         realm.length() == 0 || uri.length() == 0 ||         nonce.length() == 0)       return "";     A1 = getA1();    A2 = getA2();      if(qop == null)      plaintext = A1 + ":" + nonce + ":" + A2;    else      plaintext = A1 + ":" + nonce + ":" + count + ":" + cnonce + ":" +                  qop + ":" + A2;    MD5Digest md5 = new MD5Digest ();    byte [] plainbytes = plaintext.getBytes();    md5.update( plainbytes, 0, plainbytes.length );    byte [] digestbytes = new byte[md5.getDigestSize()];    md5.doFinal(digestbytes, 0);     return convert2Hex(digestbytes, 16);  }  private String getA1() {    String plaintext, digest;     plaintext = username + ":" + realm + ":" + password;     MD5Digest md5 = new MD5Digest ();    byte [] plainbytes = plaintext.getBytes();    md5.update( plainbytes, 0, plainbytes.length );    byte [] digestbytes = new byte[md5.getDigestSize()];    md5.doFinal(digestbytes, 0);     digest = convert2Hex(digestbytes, 16);     /* No MD5-sess support right now    if(algor.toLowerCase().compareTo("md5-sess") != 0) return digest;     digest += ":" + nonce + ":" + cnonce;     MD.update(digest.getBytes());     digest = convert2Hex(MD.digest(), 16);    */    return digest;  }  private String getA2() {    String plaintext;     plaintext = httpMethod + ":" + uri;     MD5Digest md5 = new MD5Digest ();    byte [] plainbytes = plaintext.getBytes();    md5.update( plainbytes, 0, plainbytes.length );    byte [] digestbytes = new byte[md5.getDigestSize()];    md5.doFinal(digestbytes, 0);     return convert2Hex(digestbytes, 16);  }  private String convert2Hex(byte [] buf, int length) {    String T = "";     for(int x = 0; x < length; x++) {      int y = buf[x];      if(y < 0) y += 256;      String d = Integer.toHexString(y);      if(d.length() == 1) T += "0";      T += d;    }    return T;  }}