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/usr/include/boost/beast/core/detail

Name	Size	Mode	Actions
impl/	-	0755	rm
allocator.hpp	945	0644	edit dl rm
async_base.hpp	901	0644	edit dl rm
base64.hpp	1942	0644	edit dl rm
base64.ipp	6170	0644	edit dl rm
bind_continuation.hpp	3504	0644	edit dl rm
bind_default_executor.hpp	3243	0644	edit dl rm
bind_handler.hpp	10959	0644	edit dl rm
buffer.hpp	1825	0644	edit dl rm
buffers_pair.hpp	2636	0644	edit dl rm
buffers_range_adaptor.hpp	2651	0644	edit dl rm
buffers_ref.hpp	1648	0644	edit dl rm
buffer_traits.hpp	2095	0644	edit dl rm
chacha.hpp	4167	0644	edit dl rm
char_buffer.hpp	1407	0644	edit dl rm
clamp.hpp	1229	0644	edit dl rm
config.hpp	2884	0644	edit dl rm
cpu_info.hpp	1787	0644	edit dl rm
flat_stream.hpp	1919	0644	edit dl rm
get_io_context.hpp	2338	0644	edit dl rm
is_invocable.hpp	1888	0644	edit dl rm
ostream.hpp	7004	0644	edit dl rm
pcg.hpp	1464	0644	edit dl rm
read.hpp	9217	0644	edit dl rm
remap_post_to_defer.hpp	2152	0644	edit dl rm
service_base.hpp	850	0644	edit dl rm
sha1.hpp	1624	0644	edit dl rm
sha1.ipp	7998	0644	edit dl rm
static_const.hpp	1154	0644	edit dl rm
static_ostream.hpp	3030	0644	edit dl rm
static_string.hpp	3030	0644	edit dl rm
stream_base.hpp	2685	0644	edit dl rm
stream_traits.hpp	2796	0644	edit dl rm
string.hpp	898	0644	edit dl rm
temporary_buffer.hpp	1611	0644	edit dl rm
tuple.hpp	2194	0644	edit dl rm
type_traits.hpp	2779	0644	edit dl rm
variant.hpp	4889	0644	edit dl rm
varint.hpp	1712	0644	edit dl rm
win32_unicode_path.hpp	2148	0644	edit dl rm
work_guard.hpp	1851	0644	edit dl rm

Edit: /usr/include/boost/beast/core/detail/chacha.hpp (4167B)

//
// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//

//
// This is a derivative work, original copyright follows:
//

/*
    Copyright (c) 2015 Orson Peters <orsonpeters@gmail.com>
    
    This software is provided 'as-is', without any express or implied warranty. In no event will the
    authors be held liable for any damages arising from the use of this software.
    
    Permission is granted to anyone to use this software for any purpose, including commercial
    applications, and to alter it and redistribute it freely, subject to the following restrictions:
    
    1. The origin of this software must not be misrepresented; you must not claim that you wrote the
       original software. If you use this software in a product, an acknowledgment in the product
       documentation would be appreciated but is not required.
    
    2. Altered source versions must be plainly marked as such, and must not be misrepresented as
       being the original software.
    
    3. This notice may not be removed or altered from any source distribution.
*/

#ifndef BOOST_BEAST_CORE_DETAIL_CHACHA_HPP
#define BOOST_BEAST_CORE_DETAIL_CHACHA_HPP

#include <cstdint>
#include <limits>

namespace boost {
namespace beast {
namespace detail {

template<std::size_t R>
class chacha
{
    alignas(16) std::uint32_t block_[16];
    std::uint32_t keysetup_[8];
    std::uint64_t ctr_ = 0;
    int idx_ = 16;

void generate_block()
    {
        std::uint32_t constexpr constants[4] = {
            0x61707865, 0x3320646e, 0x79622d32, 0x6b206574 };
        std::uint32_t input[16];
        for (int i = 0; i < 4; ++i)
            input[i] = constants[i];
        for (int i = 0; i < 8; ++i)
            input[4 + i] = keysetup_[i];
        input[12] = (ctr_ / 16) & 0xffffffffu;
        input[13] = (ctr_ / 16) >> 32;
        input[14] = input[15] = 0xdeadbeef; // Could use 128-bit counter.
        for (int i = 0; i < 16; ++i)
            block_[i] = input[i];
        chacha_core();
        for (int i = 0; i < 16; ++i)
            block_[i] += input[i];
    }

void chacha_core()
    {
        #define BOOST_BEAST_CHACHA_ROTL32(x, n) (((x) << (n)) | ((x) >> (32 - (n))))

#define BOOST_BEAST_CHACHA_QUARTERROUND(x, a, b, c, d) \
            x[a] = x[a] + x[b]; x[d] ^= x[a]; x[d] = BOOST_BEAST_CHACHA_ROTL32(x[d], 16); \
            x[c] = x[c] + x[d]; x[b] ^= x[c]; x[b] = BOOST_BEAST_CHACHA_ROTL32(x[b], 12); \
            x[a] = x[a] + x[b]; x[d] ^= x[a]; x[d] = BOOST_BEAST_CHACHA_ROTL32(x[d],  8); \
            x[c] = x[c] + x[d]; x[b] ^= x[c]; x[b] = BOOST_BEAST_CHACHA_ROTL32(x[b],  7)

for (unsigned i = 0; i < R; i += 2)
        {
            BOOST_BEAST_CHACHA_QUARTERROUND(block_, 0, 4,  8, 12);
            BOOST_BEAST_CHACHA_QUARTERROUND(block_, 1, 5,  9, 13);
            BOOST_BEAST_CHACHA_QUARTERROUND(block_, 2, 6, 10, 14);
            BOOST_BEAST_CHACHA_QUARTERROUND(block_, 3, 7, 11, 15);
            BOOST_BEAST_CHACHA_QUARTERROUND(block_, 0, 5, 10, 15);
            BOOST_BEAST_CHACHA_QUARTERROUND(block_, 1, 6, 11, 12);
            BOOST_BEAST_CHACHA_QUARTERROUND(block_, 2, 7,  8, 13);
            BOOST_BEAST_CHACHA_QUARTERROUND(block_, 3, 4,  9, 14);
        }

#undef BOOST_BEAST_CHACHA_QUARTERROUND
        #undef BOOST_BEAST_CHACHA_ROTL32
    }

public:
    static constexpr std::size_t state_size = sizeof(chacha::keysetup_);

using result_type = std::uint32_t;

chacha(std::uint32_t const* v, std::uint64_t stream)
    {
        for (int i = 0; i < 6; ++i)
            keysetup_[i] = v[i];
        keysetup_[6] = v[6] + (stream & 0xffffffff);
        keysetup_[7] = v[7] + ((stream >> 32) & 0xffffffff);
    }

std::uint32_t
    operator()()
    {
        if(idx_ == 16)
        {
            idx_ = 0;
            ++ctr_;
            generate_block();
        }
        return block_[idx_++];
    }
};

} // detail
} // beast
} // boost

#endif

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