45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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 = util::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 = util::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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