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56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
// Luanti
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// SPDX-License-Identifier: LGPL-2.1-or-later
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// Copyright (C) 2024 SFENCE
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#include "guid.h"
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#include <cstring>
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#include <sstream>
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#include <string_view>
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#include "exceptions.h"
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#include "util/base64.h"
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#include "log.h"
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#include "porting.h"
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#include "util/numeric.h"
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std::string MyGUID::base64() const
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{
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return base64_encode(std::string_view(&bytes[0], bytes.size()));
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}
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void MyGUID::serialize(std::ostream &os) const
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{
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os.write(&bytes[0], bytes.size());
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}
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void MyGUID::deSerialize(std::istream &is)
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{
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is.read(&bytes[0], bytes.size());
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if (is.eof())
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throw SerializationError("GUID data truncated");
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}
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GUIDGenerator::GUIDGenerator() :
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m_uniform(0, UINT64_MAX)
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{
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u64 seed;
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if (!porting::secure_rand_fill_buf(&seed, sizeof(seed))) {
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// main.cpp initializes our internal RNG as good as possible, so fall back to it
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myrand_bytes(&seed, sizeof(seed));
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}
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// Make sure we're not losing entropy or providing too few
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static_assert(sizeof(seed) == sizeof(decltype(m_rand)::result_type), "seed type mismatch");
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m_rand.seed(seed);
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}
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MyGUID GUIDGenerator::next()
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{
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u64 rand1 = m_uniform(m_rand);
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u64 rand2 = m_uniform(m_rand);
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std::array<char, 16> bytes;
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std::memcpy(&bytes[0], reinterpret_cast<char*>(&rand1), 8);
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std::memcpy(&bytes[8], reinterpret_cast<char*>(&rand2), 8);
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return MyGUID{bytes};
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}
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