37 lines
974 B
C++
37 lines
974 B
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2017-2018 Danny Robson <danny@nerdcruft.net>
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*/
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#include "./salsa.hpp"
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///////////////////////////////////////////////////////////////////////////////
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std::array<uint8_t,64>
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cruft::crypto::stream::salsa20 (const std::array<uint8_t,64> bytes) noexcept
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{
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wcast-align"
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auto x = *reinterpret_cast<const std::array<uint32_t,16>*> (&bytes);
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auto y = x;
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for (auto &t: x)
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t = cruft::ltoh (t);
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for (int i = 0; i < 10; ++i)
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x = salsa::doubleround (x);
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for (size_t i = 0; i < std::size (y); ++i)
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x[i] += y[i];
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for (auto &t: x)
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t = cruft::htol (t);
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return *reinterpret_cast<std::array<uint8_t,64>*> (&x);
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#pragma GCC diagnostic pop
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}
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