mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-23 21:25:49 +00:00
314 lines
8.9 KiB
C++
314 lines
8.9 KiB
C++
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#ifndef SPROUT_CHECKSUM_SHA1_HPP
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#define SPROUT_CHECKSUM_SHA1_HPP
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#include <cstddef>
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#include <cstdint>
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#include <climits>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/index_tuple.hpp>
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#include <sprout/array.hpp>
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#include <sprout/sub_array.hpp>
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#include <sprout/fixed_container/functions.hpp>
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#include <sprout/iterator/operation.hpp>
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#include <sprout/iterator/bytes_iterator.hpp>
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#include <sprout/range/algorithm/fixed/copy.hpp>
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#include <sprout/operation/fixed/set.hpp>
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namespace sprout {
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static_assert(CHAR_BIT == 8, "CHAR_BIT == 8");
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namespace detail {
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SPROUT_CONSTEXPR inline std::uint32_t sha1_left_rotate(std::uint32_t x, std::size_t n) {
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return (x << n) ^ (x >> (32 - n));
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}
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} // namespace detail
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//
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// sha1
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//
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class sha1 {
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public:
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typedef sprout::array<std::uint8_t, 20> value_type;
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private:
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sprout::array<std::uint32_t, 5> h_;
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sprout::array<std::uint8_t, 64> block_;
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std::size_t block_byte_index_;
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std::size_t byte_count_;
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private:
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SPROUT_CONSTEXPR sha1(
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sprout::array<std::uint32_t, 5> const& h,
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sprout::array<std::uint8_t, 64> const& block,
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std::size_t block_byte_index,
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std::size_t byte_count
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)
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: h_(h)
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, block_(block)
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, block_byte_index_(block_byte_index)
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, byte_count_(byte_count)
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{}
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SPROUT_CONSTEXPR std::uint32_t calc_w(std::size_t i) const {
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return i < 16
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? (block_[i * 4] << 24)
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| (block_[i * 4 + 1] << 16)
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| (block_[i * 4 + 2] << 8)
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| (block_[i * 4 + 3])
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: sprout::detail::sha1_left_rotate(
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calc_w(i - 3) ^ calc_w(i - 8) ^ calc_w(i - 14) ^ calc_w(i - 16),
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1
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)
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;
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}
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SPROUT_CONSTEXPR sha1 process(
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sprout::array<std::uint32_t, 5> const& h,
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sprout::array<std::uint8_t, 64> const& block,
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std::size_t block_byte_index,
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std::size_t byte_count
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) const
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{
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return block_byte_index != 64
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? sha1(
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h,
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block,
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block_byte_index,
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byte_count
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)
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: sha1(
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h,
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block,
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0,
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byte_count
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).process_block()
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;
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}
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SPROUT_CONSTEXPR sha1 process_block_2(
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std::uint32_t a,
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std::uint32_t b,
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std::uint32_t c,
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std::uint32_t d,
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std::uint32_t e,
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std::size_t i,
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std::uint32_t f,
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std::uint32_t k
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) const
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{
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return process_block_1(
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sprout::detail::sha1_left_rotate(a, 5) + f + e + k + calc_w(i),
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a,
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sprout::detail::sha1_left_rotate(b, 30),
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c,
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d,
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i + 1
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);
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}
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SPROUT_CONSTEXPR sha1 process_block_1(
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std::uint32_t a,
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std::uint32_t b,
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std::uint32_t c,
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std::uint32_t d,
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std::uint32_t e,
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std::size_t i = 0
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) const
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{
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return i < 80
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? process_block_2(
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a,
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b,
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c,
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d,
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e,
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i,
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i < 20 ? (b & c) | (~b & d)
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: i < 40 ? b ^ c ^ d
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: i < 60 ? (b & c) | (b & d) | (c & d)
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: b ^ c ^ d
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,
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i < 20 ? 0x5A827999
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: i < 40 ? 0x6ED9EBA1
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: i < 60 ? 0x8F1BBCDC
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: 0xCA62C1D6
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)
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: sha1(
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sprout::array<std::uint32_t, 5>{{h_[0] + a, h_[1] + b, h_[2] + c, h_[3] + d, h_[4] + e}},
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block_,
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block_byte_index_,
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byte_count_
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)
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;
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}
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SPROUT_CONSTEXPR sha1 process_block() const {
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return process_block_1(h_[0], h_[1], h_[2], h_[3], h_[4]);
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}
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template<typename Iterator, typename... Args>
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SPROUT_CONSTEXPR typename std::enable_if<
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sizeof...(Args) == 64,
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sha1
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>::type process_block_impl(
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Iterator first,
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Iterator last,
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Args... args
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) const
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{
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return first == last ? process(
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h_,
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sprout::make_array<std::uint8_t>(args...),
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64,
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byte_count_ + 64
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)
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: process(
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h_,
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sprout::make_array<std::uint8_t>(args...),
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64,
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byte_count_ + 64
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).process_block_impl(first, last)
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;
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}
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template<typename Iterator, typename... Args>
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SPROUT_CONSTEXPR typename std::enable_if<
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sizeof...(Args) != 64,
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sha1
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>::type process_block_impl(
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Iterator first,
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Iterator last,
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Args... args
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) const
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{
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return first == last ? process(
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h_,
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sprout::get_fixed(sprout::range::fixed::copy(sprout::make_array<std::uint8_t>(args...), sprout::sub(block_, block_byte_index_))),
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block_byte_index_ + sizeof...(Args),
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byte_count_ + sizeof...(Args)
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)
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: block_byte_index_ + sizeof...(Args) == 64 ? process(
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h_,
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sprout::get_fixed(sprout::range::fixed::copy(sprout::make_array<std::uint8_t>(args...), sprout::sub(block_, block_byte_index_))),
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block_byte_index_ + sizeof...(Args),
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byte_count_ + sizeof...(Args)
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).process_block_impl(first, last)
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: process_block_impl(sprout::next(first), last, args..., *first)
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;
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}
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template<typename... Args>
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SPROUT_CONSTEXPR typename std::enable_if<
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sizeof...(Args) == 64,
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sha1
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>::type process_padding(
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Args... args
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) const
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{
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return process(
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h_,
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sprout::make_array<std::uint8_t>(args...),
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64,
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byte_count_ + 64
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).process_padding()
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;
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}
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template<typename... Args>
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SPROUT_CONSTEXPR typename std::enable_if<
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sizeof...(Args) != 64,
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sha1
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>::type process_padding(
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Args... args
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) const
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{
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return block_byte_index_ + sizeof...(Args) == 56 ? process(
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h_,
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sprout::get_fixed(sprout::range::fixed::copy(sprout::make_array<std::uint8_t>(args...), sprout::sub(block_, block_byte_index_))),
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block_byte_index_ + sizeof...(Args),
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byte_count_ + sizeof...(Args)
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)
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: block_byte_index_ + sizeof...(Args) == 64 ? process(
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h_,
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sprout::get_fixed(sprout::range::fixed::copy(sprout::make_array<std::uint8_t>(args...), sprout::sub(block_, block_byte_index_))),
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block_byte_index_ + sizeof...(Args),
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byte_count_ + sizeof...(Args)
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).process_padding()
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: process_padding(args..., static_cast<std::uint8_t>(0))
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;
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}
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SPROUT_CONSTEXPR sha1 process_append() const {
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return process(
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h_,
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sprout::get_fixed(sprout::range::fixed::copy(
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sprout::array<std::uint8_t, 8>{{
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static_cast<std::uint8_t>(0),
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static_cast<std::uint8_t>(0),
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static_cast<std::uint8_t>(0),
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static_cast<std::uint8_t>(0),
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static_cast<std::uint8_t>((byte_count_ * 8 >> 24) & 0xFF),
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static_cast<std::uint8_t>((byte_count_ * 8 >> 16) & 0xFF),
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static_cast<std::uint8_t>((byte_count_ * 8 >> 8) & 0xFF),
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static_cast<std::uint8_t>((byte_count_ * 8) & 0xFF)
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}},
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sprout::sub(block_, block_byte_index_)
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)),
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block_byte_index_ + 8,
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byte_count_ + 8
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);
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}
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SPROUT_CONSTEXPR value_type make_value() const {
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return value_type{{
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static_cast<std::uint8_t>((h_[0] >> 24) & 0xFF),
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static_cast<std::uint8_t>((h_[0] >> 16) & 0xFF),
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static_cast<std::uint8_t>((h_[0] >> 8) & 0xFF),
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static_cast<std::uint8_t>((h_[0]) & 0xFF),
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static_cast<std::uint8_t>((h_[1] >> 24) & 0xFF),
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static_cast<std::uint8_t>((h_[1] >> 16) & 0xFF),
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static_cast<std::uint8_t>((h_[1] >> 8) & 0xFF),
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static_cast<std::uint8_t>((h_[1]) & 0xFF),
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static_cast<std::uint8_t>((h_[2] >> 24) & 0xFF),
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static_cast<std::uint8_t>((h_[2] >> 16) & 0xFF),
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static_cast<std::uint8_t>((h_[2] >> 8) & 0xFF),
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static_cast<std::uint8_t>((h_[2]) & 0xFF),
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static_cast<std::uint8_t>((h_[3] >> 24) & 0xFF),
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static_cast<std::uint8_t>((h_[3] >> 16) & 0xFF),
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static_cast<std::uint8_t>((h_[3] >> 8) & 0xFF),
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static_cast<std::uint8_t>((h_[3]) & 0xFF),
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static_cast<std::uint8_t>((h_[4] >> 24) & 0xFF),
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static_cast<std::uint8_t>((h_[4] >> 16) & 0xFF),
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static_cast<std::uint8_t>((h_[4] >> 8) & 0xFF),
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static_cast<std::uint8_t>((h_[4]) & 0xFF)
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}};
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}
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public:
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SPROUT_CONSTEXPR sha1()
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: h_{{0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0}}
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, block_{{}}
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, block_byte_index_()
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, byte_count_()
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{}
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SPROUT_CONSTEXPR sha1 process_byte(std::uint8_t byte) const {
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return process(
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h_,
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sprout::fixed::set(block_, block_.begin() + block_byte_index_, byte),
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block_byte_index_ + 1,
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byte_count_ + 1
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);
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}
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template<typename Iterator>
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SPROUT_CONSTEXPR sha1 process_block(Iterator bytes_begin, Iterator bytes_end) const {
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return process_block_impl(
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sprout::make_bytes_iterator(bytes_begin),
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sprout::make_bytes_iterator(bytes_end)
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);
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}
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template<typename Iterator>
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SPROUT_CONSTEXPR sha1 process_bytes(Iterator buffer, std::size_t byte_count) const {
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return process_block(buffer, sprout::next(buffer, byte_count));
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}
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template<typename Range>
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SPROUT_CONSTEXPR sha1 process_range(Range const& bytes_range) const {
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return process_block(sprout::begin(bytes_range), sprout::end(bytes_range));
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}
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SPROUT_CONSTEXPR value_type checksum() const {
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return process_byte(0x80).process_padding().process_append().make_value();
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}
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SPROUT_CONSTEXPR value_type operator()() const {
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return checksum();
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}
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};
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} // namespace sprout
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#endif // #ifndef SPROUT_CHECKSUM_SHA1_HPP
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