How to generate oauth signature using HMAC-SHA1 in Symbian C++

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Article Metadata

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Tested with

SDK: Symbian^3 SDK 1.0

Devices(s): Nokia E7 , Symbian Anna

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Article

Keywords: CHMAC, Oauth

Created: shafali gupta (28 Jan 2010)

Reviewed: ashraf fawzy (06 Dec 2011)

Last edited: hamishwillee (24 Apr 2012)

This code snippet shows how to generate an OAUTH signature using HMAC-SHA1 in Symbian C++. The oauth_signature is a signature computed from the base URL and a secret key, so before generating signature you must know about the key and base URL.

Includes

#include <hash.h>
#include <IMCVCODC.H>

Library

Link against:
hash.lib
imut.lib

Source

CSHA1* sha=CSHA1::NewL();
TBuf8<100> keyVal;
keyVal.Copy(_L8("Place your key value here"));
CHMAC* hmac=CHMAC::NewL(keyVal,sha);
TBuf8<1024> baseString;
//example base string (GET&http%3A%2F%2Fabc.com%2Frequest_token&oauth_consumer_key%3Deffe)
baseString.Copy(_L8("Add your base string for which the signature need to be generated"));
TPtrC8 hashedSig(hmac->Hash(baseString));
TImCodecB64 b64enc;
b64enc.Initialise();
HBufC8* buf = HBufC8::NewL(hashedSig.Length() * 2);
buf->Des().Copy(hashedSig);
TBuf8<512> result;
// encode your signature into base64 or encoding scheme required
b64enc.Encode(  buf->Des(),result);
 
if(hmac)
  {
  delete hmac;
  hmac=NULL;
  }