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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 = 10; // 10-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;
+}