Hi, I'd like to use HMAC-SHA1 for implementing OAugh signature generation.
For this purposes I wanted to use follow sample
AutoSeededRandomPool prng;
SecByteBlock key(16);
prng.GenerateBlock(key, key.size());
string plain = "HMAC Test";
string mac, encoded;
/*********************************\
\*********************************/
// Pretty print key
encoded.clear();
StringSource(key, key.size(), true,
new HexEncoder(
new StringSink(encoded)
) // HexEncoder
); // StringSource
cout << "key: " << encoded << endl;
cout << "plain text: " << plain << endl;
/*********************************\
\*********************************/
try
{
HMAC< SHA1 > hmac(key, key.size());
StringSource(plain, true,
new HashFilter(hmac,
new StringSink(mac)
) // HashFilter
); // StringSource
}
catch(const CryptoPP::Exception& e)
{
cerr << e.what() << endl;
exit(1);
}
/*********************************\
\*********************************/
// Pretty print
encoded.clear();
StringSource(mac, true,
new HexEncoder(
new StringSink(encoded)
) // HexEncoder
); // StringSource
cout << "hmac: " << encoded << endl;
But my programming experience is limited only by procedural programming, so
i can't understand what size of key i should use if it can be changeable
and how force this sample takes custom keys. Can somebody help me? Thanks
in advance.
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