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361 lines
12 KiB
C++
361 lines
12 KiB
C++
#ifndef PICOSHA3_H
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#define PICOSHA3_H
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#include <array>
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#include <cassert>
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#include <fstream>
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#include <iomanip>
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#include <sstream>
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namespace picosha3 {
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constexpr size_t bits_to_bytes(size_t bits) { return bits / 8; };
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constexpr static size_t b_bytes = bits_to_bytes(1600);
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constexpr static uint64_t RC[24] = {
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0x0000000000000001ull, 0x0000000000008082ull, 0x800000000000808Aull,
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0x8000000080008000ull, 0x000000000000808Bull, 0x0000000080000001ull,
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0x8000000080008081ull, 0x8000000000008009ull, 0x000000000000008Aull,
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0x0000000000000088ull, 0x0000000080008009ull, 0x000000008000000Aull,
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0x000000008000808Bull, 0x800000000000008Bull, 0x8000000000008089ull,
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0x8000000000008003ull, 0x8000000000008002ull, 0x8000000000000080ull,
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0x000000000000800Aull, 0x800000008000000Aull, 0x8000000080008081ull,
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0x8000000000008080ull, 0x0000000080000001ull, 0x8000000080008008ull};
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using byte_t = uint8_t;
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using state_t = std::array<std::array<uint64_t, 5>, 5>;
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inline void theta(state_t& A) {
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uint64_t C[5] = {0, 0, 0, 0, 0};
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for(size_t x = 0; x < 5; ++x) {
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C[x] = A[x][0] ^ A[x][1] ^ A[x][2] ^ A[x][3] ^ A[x][4];
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};
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uint64_t D[5] = {0, 0, 0, 0, 0};
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D[0] = C[4] ^ (C[1] << 1 | C[1] >> (64 - 1));
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D[1] = C[0] ^ (C[2] << 1 | C[2] >> (64 - 1));
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D[2] = C[1] ^ (C[3] << 1 | C[3] >> (64 - 1));
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D[3] = C[2] ^ (C[4] << 1 | C[4] >> (64 - 1));
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D[4] = C[3] ^ (C[0] << 1 | C[0] >> (64 - 1));
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for(size_t x = 0; x < 5; ++x) {
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for(size_t y = 0; y < 5; ++y) {
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A[x][y] ^= D[x];
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}
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}
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};
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inline void rho(state_t& A) {
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size_t x{1};
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size_t y{0};
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for(size_t t = 0; t < 24; ++t) {
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size_t offset = ((t + 1) * (t + 2) / 2) % 64;
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A[x][y] = (A[x][y] << offset) | (A[x][y] >> (64 - offset));
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size_t tmp{y};
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y = (2 * x + 3 * y) % 5;
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x = tmp;
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};
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};
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inline void pi(state_t& A) {
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state_t tmp{A};
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for(size_t x = 0; x < 5; ++x) {
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for(size_t y = 0; y < 5; ++y) {
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A[x][y] = tmp[(x + 3 * y) % 5][x];
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}
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}
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};
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inline void chi(state_t& A) {
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state_t tmp{A};
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for(size_t x = 0; x < 5; ++x) {
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for(size_t y = 0; y < 5; ++y) {
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A[x][y] =
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tmp[x][y] ^ (~(tmp[(x + 1) % 5][y]) & tmp[(x + 2) % 5][y]);
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}
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}
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};
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inline void iota(state_t& A, size_t round_index) {
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A[0][0] ^= RC[round_index];
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};
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inline void keccak_p(state_t& A) {
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for(size_t round_index = 0; round_index < 24; ++round_index) {
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theta(A);
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rho(A);
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pi(A);
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chi(A);
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iota(A, round_index);
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}
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};
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namespace {
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inline void next(size_t& x, size_t& y, size_t& i) {
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if(++i != 8) {
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return;
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}
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i = 0;
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if(++x != 5) {
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return;
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}
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x = 0;
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if(++y != 5) {
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return;
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}
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}
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} // namespace
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template <typename InIter>
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void absorb(InIter first, InIter last, state_t& A) {
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size_t x = 0;
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size_t y = 0;
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size_t i = 0;
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for(; first != last && y < 5; ++first) {
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auto tmp = static_cast<uint64_t>(*first);
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A[x][y] ^= (tmp << (i * 8));
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next(x, y, i);
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};
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}
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template <typename InContainer>
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void absorb(const InContainer& src, state_t& A) {
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absorb(src.cbegin(), src.cend(), A);
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};
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template <typename OutIter>
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OutIter squeeze(const state_t& A, OutIter first, OutIter last,
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size_t rate_bytes) {
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size_t x = 0;
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size_t y = 0;
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size_t i = 0;
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for(size_t read_bytes = 0;
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first != last && y < 5 && read_bytes < rate_bytes;
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++read_bytes, ++first) {
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auto tmp = static_cast<uint64_t>(A[x][y]);
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auto p = reinterpret_cast<byte_t*>(&tmp);
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*first = *(p + i);
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next(x, y, i);
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}
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return first;
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};
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template <typename OutContainer>
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typename OutContainer::iterator
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squeeze(const state_t& A, OutContainer& dest, size_t rate_bytes) {
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return squeeze(A, dest.begin(), dest.end(), rate_bytes);
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}
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enum class PaddingType {
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SHA,
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SHAKE,
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};
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template <typename InIter>
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std::string bytes_to_hex_string(InIter first, InIter last) {
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std::stringstream ss;
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ss << std::hex;
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for(; first != last; ++first) {
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ss << std::setw(2) << std::setfill('0')
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<< static_cast<uint64_t>(*first);
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}
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return ss.str();
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}
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template <typename InContainer>
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std::string bytes_to_hex_string(const InContainer& src) {
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return bytes_to_hex_string(src.cbegin(), src.cend());
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}
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template <size_t rate_bytes, size_t d_bytes, PaddingType padding_type>
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class HashGenerator {
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public:
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HashGenerator()
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: buffer_{}, buffer_pos_{buffer_.begin()}, A_{}, hash_{},
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is_finished_{false} {}
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void clear() {
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clear_state();
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clear_buffer();
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is_finished_ = false;
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}
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template <typename InIter>
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void process(InIter first, InIter last) {
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static_assert(
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sizeof(typename std::iterator_traits<InIter>::value_type) == 1,
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"The size of input iterator value_type must be one byte.");
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for(; first != last; ++first) {
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*buffer_pos_ = *first;
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if(++buffer_pos_ == buffer_.end()) {
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absorb(buffer_, A_);
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keccak_p(A_);
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clear_buffer();
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}
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}
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};
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void finish() {
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add_padding();
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absorb(buffer_, A_);
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keccak_p(A_);
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squeeze_();
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is_finished_ = true;
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};
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template <typename OutIter>
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void get_hash_bytes(OutIter first, OutIter last) {
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if(!is_finished_) {
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throw std::runtime_error("Not finished!");
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}
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std::copy(hash_.cbegin(), hash_.cend(), first);
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};
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template <typename OutCotainer>
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void get_hash_bytes(OutCotainer& dest) {
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get_hash_bytes(dest.begin(), dest.end());
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};
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template <typename InIter, typename OutIter>
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void operator()(InIter in_first, InIter in_last, OutIter out_first,
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OutIter out_last) {
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static_assert(
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sizeof(typename std::iterator_traits<InIter>::value_type) == 1,
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"The size of input iterator value_type must be one byte.");
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static_assert(
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sizeof(typename std::iterator_traits<OutIter>::value_type) == 1,
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"The size of output iterator value_type must be one byte.");
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process(in_first, in_last);
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finish();
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std::copy(hash_.cbegin(), hash_.cend(), out_first);
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clear();
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};
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template <typename InIter, typename OutCotainer>
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void operator()(InIter in_first, InIter in_last, OutCotainer& dest) {
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operator()(in_first, in_last, dest.begin(), dest.end());
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};
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template <typename InContainer, typename OutIter>
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void operator()(const InContainer& src, OutIter out_first,
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OutIter out_last) {
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operator()(src.cbegin(), src.cend(), out_first, out_last);
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};
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template <typename InContainer, typename OutContainer>
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void operator()(const InContainer& src, OutContainer& dest) {
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operator()(src.cbegin(), src.cend(), dest.begin(), dest.end());
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};
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template <typename OutIter>
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void operator()(std::ifstream& ifs, OutIter out_first,
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OutIter out_last) {
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auto in_first = std::istreambuf_iterator<char>(ifs);
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auto in_last = std::istreambuf_iterator<char>();
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operator()(in_first, in_last, out_first, out_last);
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};
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template <typename OutCotainer>
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void operator()(std::ifstream& ifs, OutCotainer& dest) {
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operator()(ifs, dest.begin(), dest.end());
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};
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std::string get_hex_string() {
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if(!is_finished_) {
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throw std::runtime_error("Not finished!");
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}
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return bytes_to_hex_string(hash_);
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};
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template <typename InIter>
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std::string get_hex_string(InIter in_first, InIter in_last) {
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process(in_first, in_last);
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finish();
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auto hash = get_hex_string();
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clear();
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return hash;
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};
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template <typename InContainer>
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std::string get_hex_string(const InContainer& src) {
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return get_hex_string(src.cbegin(), src.cend());
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};
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std::string get_hex_string(std::ifstream& ifs) {
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auto in_first = std::istreambuf_iterator<char>(ifs);
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auto in_last = std::istreambuf_iterator<char>();
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return get_hex_string(in_first, in_last);
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};
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private:
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void clear_buffer() {
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buffer_.fill(0);
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buffer_pos_ = buffer_.begin();
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};
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void clear_state() {
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for(auto& row : A_) {
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row.fill(0);
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}
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};
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void add_padding() {
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const auto q =
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buffer_.size() - std::distance(buffer_pos_, buffer_.begin());
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if(padding_type == PaddingType::SHA) {
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if(q == 1) {
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*buffer_pos_ = 0x86;
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} else {
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*buffer_pos_ = 0x06;
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buffer_.back() = 0x80;
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}
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} else if(padding_type == PaddingType::SHAKE) {
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if(q == 1) {
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*buffer_pos_ = 0x9F;
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} else {
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*buffer_pos_ = 0x1F;
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buffer_.back() = 0x80;
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}
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}
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};
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void squeeze_() {
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auto first = hash_.begin();
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auto last = hash_.end();
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first = squeeze(A_, first, last, rate_bytes);
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while(first != last) {
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keccak_p(A_);
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first = squeeze(A_, first, last, rate_bytes);
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}
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};
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std::array<byte_t, rate_bytes> buffer_;
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typename decltype(buffer_)::iterator buffer_pos_;
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state_t A_;
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std::array<byte_t, d_bytes> hash_;
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bool is_finished_;
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};
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template <size_t d_bits>
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auto get_sha3_generator() {
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static_assert(
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d_bits == 224 or d_bits == 256 or d_bits == 384 or d_bits == 512,
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"SHA3 only accepts digest message length 224, 256 384 or 512 bits.");
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constexpr auto d_bytes = bits_to_bytes(d_bits);
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constexpr auto capacity_bytes = d_bytes * 2;
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constexpr auto rate_bytes = b_bytes - capacity_bytes;
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return HashGenerator<rate_bytes, d_bytes, PaddingType::SHA>{};
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}
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template <size_t strength_bits, size_t d_bits>
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auto get_shake_generator() {
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static_assert(strength_bits == 128 or strength_bits == 256,
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"SHAKE only accepts strength 128 or 256 bits.");
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constexpr auto strength_bytes = bits_to_bytes(strength_bits);
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constexpr auto capacity_bytes = strength_bytes * 2;
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constexpr auto rate_bytes = b_bytes - capacity_bytes;
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constexpr auto d_bytes = bits_to_bytes(d_bits);
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return HashGenerator<rate_bytes, d_bytes, PaddingType::SHAKE>{};
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}
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} // namespace picosha3
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#endif
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