Symbian Series 40 java HMACSha256 routine

As I can't find a native HMACSha256 routine in the Java libraries for Symbian Series 40.

We require a Java HMACSha256 routine written to work on a Nokia Series 40 mobile devices.

Internally we are porting an Android application to work on Symbian phones. Our dev environment is Elcipse and JavaME library [Nokia

SDK1.1 for Java/Nokia_SDK_1_1_Java] and a Java Compliance level of 1.3.

When running the HMACSha256 routine, it will need to accept 2 inputs :
Message - String of length 16 eg. 1234567890123456 (receive only numbers for our routine)
salt - byte[] of length 32 eg.

[18, 52, 86, 120, -112, 18, 52, 86, 120, -112, 18, 52, 86, 120, -112, 18, 52, 102, 72, -96, 34, 4, 102, 72, -96, 34, 4, 102, 72, -96,

34, 4]


With the above inputs the following result should be

140222341996612811960157391723124820121629210035133133167832812823411673163509311



Below is the Android Java code that requires porting.


private static String HMACSha256Hash(String Message, byte[] seed) {
String retValue = "";
double doubleValue;
long ii = 0;
byte[] bMesg = null;
byte[] tmpReversedMesg;

// First we convert the message into a Long so that it is 8 Bytes / 64 Bit

try{
ii = Long.parseLong(message);
}catch (NumberFormatException nfe){
ii=0;
}

// The 64 Bit is then placed into a Byte array
bMesg = longToByteArrayReversed(ii);

String s;

try {
Key sk = new SecretKeySpec(seed,"HmacSHA256" );
Mac sha256_HMAC = Mac.getInstance(sk.getAlgorithm());
sha256_HMAC.init(sk);
final byte[] hmac = sha256_HMAC.doFinal(bMesg);
// At this stage we have a signed Byte array which we need to manipulate
//convert the byte to hex format method 1 and then convert the hex to in for the string build up.

for (int i = 0; i < hmac.length; i++) {
s = Integer.toString((hmac[i] & 0xff) + 0x100, 16).substring(1);
retValue += Integer.valueOf(s, 16).intValue();
}
}catch(Exception e){
return null;
}

return retValue;
}