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/*
Copyright (C) 2014-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "digester.h"
#include "dcpomatic_assert.h"
#include <nettle/md5.h>
#include <iomanip>
#include <cstdio>
using std::string;
using std::hex;
using std::setfill;
using std::setw;
Digester::Digester ()
{
md5_init (&_context);
}
Digester::~Digester ()
{
get ();
}
void
Digester::add (void const * data, size_t size)
{
md5_update (&_context, size, reinterpret_cast<uint8_t const *>(data));
}
void
Digester::add (string const & s)
{
add (s.c_str(), s.length());
}
string
Digester::get () const
{
if (!_digest) {
unsigned char digest[MD5_DIGEST_SIZE];
md5_digest (&_context, MD5_DIGEST_SIZE, digest);
char hex[MD5_DIGEST_SIZE * 2 + 1];
for (int i = 0; i < MD5_DIGEST_SIZE; ++i) {
sprintf(hex + i * 2, "%02x", digest[i]);
}
_digest = hex;
}
return _digest.get ();
}
void
Digester::get (uint8_t* buffer) const
{
md5_digest (&_context, MD5_DIGEST_SIZE, buffer);
}
int
Digester::size () const
{
return MD5_DIGEST_SIZE;
}
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