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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/***************************************************************************
* hash.cc
*
* Sun Jul 5 10:37:32 CEST 2020
* Copyright 2020 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of Munia.
*
* Munia 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.
*
* Munia 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 Munia; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "hash.h"
#include <cstdint>
#include <vector>
#include <argon2.h>
std::string getEncoded(const Salt& salt, const std::string& password)
{
constexpr std::size_t hashlen = 32u;
constexpr std::uint32_t t_cost = 9; // 9-pass computation
constexpr std::uint32_t m_cost = (1 << 16); // 64 mebibytes memory usage
constexpr std::uint32_t parallelism = 1; // number of threads and lanes
auto encodedlen = argon2_encodedlen(t_cost, m_cost, parallelism,
salt.size(), hashlen, Argon2_i);
std::vector<char> encoded(encodedlen, '\0');
auto ret = argon2i_hash_encoded(t_cost, m_cost, parallelism,
password.data(), password.length(),
salt.data(), salt.size(),
hashlen,
encoded.data(), encoded.size());
if(ret != ARGON2_OK)
{
throw "Argon2 encoding error.";
}
// convert vector<char> to string
std::string s;
s.reserve(encoded.size());
for(const auto& e : encoded)
{
s += e;
}
return s;
}
bool verifyEncoded(const std::string& encoded, const std::string& password)
{
auto ret = argon2i_verify(encoded.data(), password.data(), password.length());
return ret == ARGON2_OK;
}
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