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/*
* (C) 2009,2010,2014,2015 Jack Lloyd
* (C) 2017 René Korthaus, Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "cli.h"
#include <botan/hex.h>
#if defined(BOTAN_HAS_MAC)
#include <botan/mac.h>
#endif
namespace Botan_CLI {
#if defined(BOTAN_HAS_HMAC)
class HMAC final : public Command
{
public:
HMAC() : Command("hmac --hash=SHA-256 --buf-size=4096 --no-fsname key *files") {}
std::string group() const override
{
return "hmac";
}
std::string description() const override
{
return "Compute the HMAC tag of given file(s)";
}
void go() override
{
const bool no_fsname = flag_set("no-fsname");
const std::string hash_algo = get_arg("hash");
std::unique_ptr<Botan::MessageAuthenticationCode> hmac =
Botan::MessageAuthenticationCode::create("HMAC(" + hash_algo + ")");
if(!hmac)
{ throw CLI_Error_Unsupported("HMAC", hash_algo); }
hmac->set_key(slurp_file(get_arg("key")));
const size_t buf_size = get_arg_sz("buf-size");
std::vector<std::string> files = get_arg_list("files");
if(files.empty())
{ files.push_back("-"); } // read stdin if no arguments on command line
for(const std::string& fsname : files)
{
try
{
auto update_hmac = [&](const uint8_t b[], size_t l) { hmac->update(b, l); };
read_file(fsname, update_hmac, buf_size);
output() << Botan::hex_encode(hmac->final());
if(no_fsname == false)
output() << " " << fsname;
output() << "\n";
}
catch(CLI_IO_Error& e)
{
error_output() << e.what() << "\n";
}
}
}
};
BOTAN_REGISTER_COMMAND("hmac", HMAC);
#endif // hmac
}