MAC differs 1.3 vs 1.4

[Marshall B Thompson]

I am creating an MD5 Message Authentication Code to exchange with a third-party application. I need to get the MD5 token for the url string I pass to them. When I use JDK 1.4.2.01 the third-party accepts my security token. However; when I use JDK 1.3.1.09 and the optional JCE 1.2.2, the token is different for the same string, and gets rejected by the third-party.

Here is my 1.4.2 code:

    private String getSecurityToken(String pstrURL)
        throws IllegalStateException, UnsupportedEncodingException,
        ServletException
    {
        //Obtain token
        byte[] keyBytes = hexStringToByteArray(keyText);
        SecretKeySpec aKey = new SecretKeySpec(keyBytes, "HmacMD5");
        //Create a MAC object using HMAC-MD5 and initialize with key
        Mac mac = null;
        try
        {
            mac = Mac.getInstance(aKey.getAlgorithm());
            mac.init(aKey);
        }
        catch(NoSuchAlgorithmException e)
        {
            throw new ServletException(e);
        }
        catch(InvalidKeyException e)
        {
            throw new ServletException(e);
        }
        //Encode the string into bytes using utf-8 and digest it
        byte[] dataBytes = pstrURL.getBytes("UTF-8");
        byte[] digest = mac.doFinal(dataBytes);
        //convert to base 64
        String digestB64 = new sun.misc.BASE64Encoder().encode(digest);
        String digestB64Encoded = URLEncoder.encode(digestB64, "UTF-8");
        return digestB64Encoded;
 
    } //getSecurityToken

Here is my 1.3.1 code

    private String getSecurityToken(String pstrURL)
        throws IllegalStateException, UnsupportedEncodingException,
        ServletException
    {
        // Install SunJCE provider
        Provider sunJce = new com.sun.crypto.provider.SunJCE();
        Security.addProvider(sunJce);
        //Without the above two lines, we get this error:
        //javax.servlet.ServletException: Algorithm HmacMD5 not available.
 
        //Obtain token
        byte[] keyBytes = hexStringToByteArray(keyText);
        SecretKeySpec aKey = new SecretKeySpec(keyBytes, "HmacMD5");
        //Create a MAC object using HMAC-MD5 and initialize with key
        Mac mac = null;
        try
        {
            mac = Mac.getInstance(aKey.getAlgorithm());
            mac.init(aKey);
        }
        catch(NoSuchAlgorithmException e)
        {
            throw new ServletException(e);
        }
        catch(InvalidKeyException e)
        {
            throw new ServletException(e);
        }
        //Encode the string into bytes using utf-8 and digest it
        byte[] dataBytes = pstrURL.getBytes("UTF-8");
       
        /*
           The byte array returned by mac.doFinal into digest, is
           different with JDK 1.3.1.09 and JCE 1.2.2, than it is
           with JDK 1.4.2.01 which has JCE in it.
        */
        byte[] digest = mac.doFinal(dataBytes);
 
        //convert to base 64
        String digestB64 = new sun.misc.BASE64Encoder().encode(digest);
 
        //J2SE 1.3.1 version
        String digestB64Encoded = URLEncoder.encode(digestB64);
        return digestB64Encoded;
 
    } //getSecurityToken

The byte array produced by the following line:
byte[] digest = mac.doFinal(dataBytes);
is apparantly incorrect with 1.3.1, but okay with 1.4.2.
Can anyone help me with this?