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);
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