validation using HMac

[priya_ps]

i am trying to validate the responce which i got from server. but i am not getting how to do?? i am referring this link but this's something different than the method used in server side MAC generation code.

Java code:

  public static byte[] generateMac(byte[] key, byte[] cipherText,int offset,int length, int mac_size_bits){
    	byte[] result = null;
    	KeyParameter keyParam = null;
    	try {
    		keyParam = new KeyParameter(key);
    		CBCBlockCipherMac blockCipherMac = new CBCBlockCipherMac(new AESEngine(),mac_size_bits);
    		result = new byte[blockCipherMac.getMacSize()];
    		blockCipherMac.init(keyParam);
    		blockCipherMac.update(cipherText, offset, length);
    		blockCipherMac.doFinal(result, 0);
    	} catch (Exception e) {
//    		System.out.println(e);
    		return null;
    	}finally{
    		keyParam = null;
    	}
    	return result;
    }

anybody suggest me what i have to change and which function to use to generate MAC key correctly.
Thank you.

[wizard_hu_]

You may want to check if existing libraries, like https://github.com/simonpk/j2me-oauth, can help.

[priya_ps]

but that's java libraries and i want to know weather i can use CBCMode as used by java to generate MAC key in symbian.
I am doing like this now

TBool CRSAContainerView::HandleOpen_SSLMenuItemSelectedL( TInt aCommand )
	{
	// TODO: implement selected event handler
	_LIT8(Glb_mac_Hex,"1c23f5a1ad703ed9ce60944b2796325e");
	_LIT8(Enc_data_Hex,	"a956ae74add99adf2781fee622ffeca6");
//	PBKDF2 (_L8("a956ae74add99adf2781fee622ffeca6"),32); 

	//MAC validation
	CSHA1* sha=CSHA1::NewL();

//	TBuf8<100> keyVal;
//	keyVal.Copy(_L8("Place your key value here"));
	HBufC8 *keyVal;
	keyVal = HexToBufLC(Glb_mac_Hex);
	HBufC8 *EncDat;
	EncDat = HexToBufLC(Enc_data_Hex);
	int EncDatL = EncDat->Des().Length();
	
	CHMAC* hmac=CHMAC::NewL(keyVal->Des(),sha);
	TInt block_size = hmac->BlockSize();
	TInt MsgDL = hmac->HashSize();
	TBuf8<1024> baseString;
	baseString.Copy(EncDat->Des());
	TPtrC8 hashedSig(hmac->Hash(baseString));
	HBufC8* buf = HBufC8::NewL(hashedSig.Length() * 2);
	buf->Des().Copy(hashedSig);
	TInt bufL = buf->Des().Length();
                HBufC8* MacHex = BufTOHex(buf->Des());

//same as above    
/*	CHMAC* hmac1=CHMAC::NewL(keyVal->Des(),sha);
	hmac1->Update(EncDat->Des());
	HBufC8* iSalt = HBufC8::NewL(200);
	iSalt->Des().Copy(hmac1->Final());
	TInt iSaltL = iSalt->Des().Length();
*/	
//	TImCodecB64 b64enc;
//	b64enc.Initialise();
//	TBuf8<512> result;
//	// encode your signature into base64 or encoding scheme required
//	b64enc.Encode(buf->Des(),result);
	 
	if(hmac)
	  {
	  delete hmac;
	  hmac=NULL;
	  }
	
	return ETrue;
	}

Here it'll generate MAC of length 20. but in java its 4,8..... so i cant validate by comparing.
i am in confusion can you pls give brief idea on this.

Thank you

[priya_ps]

I found some details about CBC MAC(AES MAC) in these links
http://en.wikipedia.org/wiki/CBC-MAC
http://www.cs.berkeley.edu/~jonah/bc...CipherMac.html
so in symbian which class i have to use to generate same kind of MAC??

[priya_ps]

No response??

I am stuck with this. anybody please shed some light on this.
After a long search i found this class CryptoSpi::CMacFactory but dont know weather i'll get the expected result from this and this class is not there in s60 3rd FP1. from where i can get CryptoSpi?? is there any API avilable to download??

[wizard_hu_]

If some API-s are missing, you can try getting them from http://www.developer.nokia.com/Commu...ptography_APIs