From feeb7602a9b386dfdd61190ce633a3b56a10c68f Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Sun, 5 Jul 2020 16:46:27 +0200
Subject: Add tool for creating argon2 hased passwords.

---
 src/hash.cc | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 src/hash.cc

(limited to 'src/hash.cc')

diff --git a/src/hash.cc b/src/hash.cc
new file mode 100644
index 0000000..5b67d92
--- /dev/null
+++ b/src/hash.cc
@@ -0,0 +1,70 @@
+/* -*- 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;
+}
-- 
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