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#include <fstream>
#include <iostream>
#include <bobcat/hmacbuf>
using namespace std;
using namespace FBB;
int main(int argc, char **argv)
try
{
// using the default (sha256) digest algorithm
if (argc == 1)
throw Exception{} <<
"Usage: arg1: 16-byte key, arg2: file to process,\n"
" arg3 (opt) buf size (default 1024)";
HMacBuf hmacbuf{ argv[1], "aes-128-cbc", "sha256",
argc == 3 ? 1024 : stoul(argv[3]) };
HMacBuf empty; // Demo: an empty HMacBuf
empty = HMacBuf{ argv[1], "sha256", 100 }; // Demo: move assignmeent
ostream out(&hmacbuf); // the ostream receiving the
// input to compute the hmac of
ifstream in{ argv[2] }; // the file to process
out << in.rdbuf() << eoi; // compute the hmac
// and show the hmac value
cout << " computed hmac value: >" << hmacbuf << "<\n";
in.seekg(0); // to illustrate 'reset': do it
hmacbuf.reset(); // again
out << in.rdbuf();
eoi(out); // calling eoi as a function
cout << "recomputed hmac value: >" << hmacbuf << "<\n";
}
catch(exception const &err)
{
cout << err.what() << endl;
return errno;
}
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