My next attempt is getting a little better. Now how to base64 encode? const char *secretId=msg_to_sign.c_str(); int msg_len = strlen( secretId );
CryptoPP::SHA256 sha256hash; unsigned char hmac[ sha256hash.DIGESTSIZE ]; memset( hmac, 0x00, sha256hash.DIGESTSIZE ); CryptoPP::HMAC<CryptoPP::SHA256>((byte*)privateId, pri_len).CalculateDigest(hmac, (byte*)secretId, msg_len); Thanks. Paul On Dec 13, 7:20 pm, Paul Crown <[email protected]> wrote: > Greetings, > > I would like to incorporate the equivalent of the following php code > snippet in a c++ app. I have been experimenting and have learned how > to use a number of crypto++ functions. I have yet, however, to fully > wrap my mind around this snippet. > > I think that I have just figured out that the term "SHA256" is used in > different respects, one as a hash method, and one as a message > encoding method. Which means that my c++ snippet is useless. > > In summary, I want to calculate HMAC with SHA256 and base64-encoding > in c++, just like demonstrated in the php snippet below. Can you > please point me in the right direction? > > Thank you. > > Paul > > Php code snippet: > > // calculate HMAC with SHA256 and base64-encoding > > $signature = base64_encode(hash_hmac("sha256", $string_to_sign, > $private_key, True)); > > c++ snippet: > > const char *secretId=msg_to_sign.c_str(); > int msg_len = strlen( secretId ); > > // sha256 > CryptoPP::SHA256 sha256hash; > unsigned char hash[ sha256hash.DIGESTSIZE ]; > memset( hash, 0x00, sha256hash.DIGESTSIZE ); > sha256hash.CalculateDigest(hash, (byte*)secretId, msg_len); // use > libcrypt0++ library > > // hmac > unsigned char hmac[ sha256hash.DIGESTSIZE ]; > memset( hmac, 0x00, sha256hash.DIGESTSIZE ); > CryptoPP::HMAC<CryptoPP::SHA256>((byte*)secretId, > msg_len).CalculateDigest(hmac, hash, sha256hash.DIGESTSIZE); -- You received this message because you are subscribed to the "Crypto++ Users" Google Group. To unsubscribe, send an email to [email protected]. More information about Crypto++ and this group is available at http://www.cryptopp.com.
