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#include <string>
#include "botan/botan.h"
#include "sanity.hh"
#include "hmac.hh"
#include "vocab.hh"
#include "constants.hh"
using std::string;
chained_hmac::chained_hmac(netsync_session_key const & session_key, bool active) :
hmac_length(constants::sha1_digest_length),
active(active),
key(reinterpret_cast<Botan::byte const *>(session_key().data()), session_key().size())
{
chain_val.assign(hmac_length, 0x00);
}
void
chained_hmac::set_key(netsync_session_key const & session_key)
{
if (active)
{
key = Botan::SymmetricKey(reinterpret_cast<Botan::byte const *>(session_key().data()),
session_key().size());
}
}
string
chained_hmac::process(string const & str, size_t pos, size_t n)
{
I(active);
I(pos < str.size());
if (n == string::npos)
n = str.size() - pos;
I(pos + n <= str.size());
Botan::Pipe p(new Botan::MAC_Filter("HMAC(SHA-160)", key,
constants::sha1_digest_length));
p.start_msg();
p.write(chain_val);
p.write(reinterpret_cast<Botan::byte const *>(str.data() + pos), n);
p.end_msg();
chain_val = p.read_all_as_string();
I(chain_val.size() == constants::sha1_digest_length);
return chain_val;
}
string
chained_hmac::process(string_queue const & str, size_t pos, size_t n)
{
I(active);
I(pos < str.size());
if (n == string::npos)
n = str.size() - pos;
I(pos + n <= str.size());
Botan::Pipe p(new Botan::MAC_Filter("HMAC(SHA-160)", key,
constants::sha1_digest_length));
p.start_msg();
p.write(chain_val);
p.write(reinterpret_cast<Botan::byte const *>(str.front_pointer(n) + pos), n);
p.end_msg();
chain_val = p.read_all_as_string();
I(chain_val.size() == constants::sha1_digest_length);
return chain_val;
}
// Local Variables:
// mode: C++
// fill-column: 76
// c-file-style: "gnu"
// indent-tabs-mode: nil
// End:
// vim: et:sw=2:sts=2:ts=2:cino=>2s,{s,\:s,+s,t0,g0,^-2,e-2,n-2,p2s,(0,=s:
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