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strobe.hpp
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/**
* Copyright Quadrivium LLC
* All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
#include <algorithm>
#include <array>
#include <cstdint>
#include <cstring>
#include <span>
#include <type_traits>
#include <boost/assert.hpp>
#include "keccak/keccak.h"
namespace kagome::primitives {
/**
* C++ implementation(Alexander 'iceseer' Lednev) of
* https://strobe.sourceforge.io/
*/
class Strobe final {
static constexpr size_t kBufferSize = 200ull;
static constexpr size_t kAlignment = 8ull;
static constexpr uint8_t kStrobeR = 166;
using Flags = uint8_t;
using Position = uint8_t;
static constexpr Flags kFlag_NU = 0x00; // NU = No Use
static constexpr Flags kFlag_I = 0x01;
static constexpr Flags kFlag_A = 0x02;
static constexpr Flags kFlag_C = 0x04;
static constexpr Flags kFlag_T = 0x08;
static constexpr Flags kFlag_M = 0x10;
static constexpr Flags kFlag_K = 0x20;
alignas(kAlignment) std::array<uint8_t, kBufferSize + 3ull> buffer_{};
Position ¤t_position_;
Position &begin_position_;
Flags ¤t_state_;
template <typename T, size_t kOffset = 0ull>
constexpr T *as() {
static_assert(kOffset < count<T>(), "Overflow!");
return (reinterpret_cast<T *>(buffer_.data()) + kOffset); // NOLINT
}
template <typename T, size_t kOffset = 0ull>
constexpr const T *as() const {
static_assert(kOffset < count<T>(), "Overflow!");
return (reinterpret_cast<const T *>(buffer_.data()) + kOffset); // NOLINT
}
template <typename T>
T *as(Position offset) {
BOOST_ASSERT(static_cast<size_t>(offset) < count<T>());
return (as<T>() + offset);
}
template <typename T>
static constexpr size_t count() {
static_assert(!std::is_reference_v<T>, "Can not be a reference type.");
static_assert(!std::is_pointer_v<T>, "Can not be a pointer.");
static_assert(std::is_integral_v<T>, "Cast to non integral type.");
return kBufferSize / sizeof(T);
}
template <size_t kOffset, typename T, size_t N>
void load(const T (&data)[N]) { // NOLINT
static_assert(kOffset + N <= count<T>(), "Load overflows!");
std::memcpy(as<T, kOffset>(), data, N);
}
template <typename T, size_t N>
void absorb(const T (&src)[N]) {
for (const auto i : src) {
*as<uint8_t>(current_position_++) ^= static_cast<uint8_t>(i);
if (kStrobeR == current_position_) {
runF();
}
}
}
void absorb(const uint8_t *src, size_t len) {
for (size_t i = 0; i < len; ++i) {
*as<uint8_t>(current_position_++) ^= src[i];
if (kStrobeR == current_position_) {
runF();
}
}
}
template <typename T, size_t N>
void overwrite(const T (&src)[N]) {
for (const auto i : src) {
*as<uint8_t>(current_position_++) = static_cast<uint8_t>(i);
if (kStrobeR == current_position_) {
runF();
}
}
}
template <typename T, size_t N>
void squeeze(T (&src)[N]) {
for (auto &i : src) {
i = static_cast<T>(*as<uint8_t>(current_position_));
*as<uint8_t>(current_position_++) = 0;
if (kStrobeR == current_position_) {
runF();
}
}
}
template <bool kMore, Flags kFlags>
void beginOp() {
static_assert((kFlags & kFlag_T) == 0, "T flag doesn't support");
if constexpr (kMore) {
BOOST_ASSERT(current_state_ == kFlags);
return;
}
const auto old_begin = begin_position_;
begin_position_ = current_position_ + 1;
current_state_ = kFlags;
absorb({old_begin, kFlags});
if constexpr (0 != (kFlags & (kFlag_C | kFlag_K))) {
if (current_position_ != 0) {
runF();
}
}
}
void runF() {
*as<uint8_t>(current_position_) ^= begin_position_;
*as<uint8_t>(current_position_ + 1) ^= 0x04;
*as<uint8_t>(kStrobeR + 1) ^= 0x80;
keccakf(as<uint64_t>());
current_position_ = 0;
begin_position_ = 0;
}
public:
Strobe()
: current_position_{buffer_[kBufferSize]},
begin_position_{buffer_[kBufferSize + 1ull]},
current_state_{buffer_[kBufferSize + 2ull]} {}
Strobe(const Strobe &other) : Strobe() {
std::ranges::copy(other.buffer_, std::begin(buffer_));
}
Strobe &operator=(const Strobe &other) {
std::ranges::copy(other.buffer_, std::begin(buffer_));
return *this;
}
Strobe(Strobe &&) = delete;
Strobe &operator=(Strobe &&) = delete;
template <typename T, size_t N>
void initialize(const T (&label)[N]) {
constexpr bool kUseRuntimeCalculation = false;
if constexpr (kUseRuntimeCalculation) {
std::memset(as<uint8_t>(), 0, count<uint8_t>());
load<0ull>((uint8_t[6]){1, kStrobeR + 2, 1, 0, 1, 96});
load<6ull>("STROBEv1.0.2");
keccakf(as<uint64_t>());
} else {
load<0ull>((uint8_t[kBufferSize]){
0x9c, 0x6d, 0x16, 0x8f, 0xf8, 0xfd, 0x55, 0xda, 0x2a, 0xa7, 0x3c,
0x23, 0x55, 0x65, 0x35, 0x63, 0xdc, 0xc, 0x47, 0x5c, 0x55, 0x15,
0x26, 0xf6, 0x73, 0x3b, 0xea, 0x22, 0xf1, 0x6c, 0xb5, 0x7c, 0xd3,
0x1f, 0x68, 0x2e, 0x66, 0xe, 0xe9, 0x12, 0x82, 0x4a, 0x77, 0x22,
0x1, 0xee, 0x13, 0x94, 0x22, 0x6f, 0x4a, 0xfc, 0xb6, 0x2d, 0x33,
0x12, 0x93, 0xcc, 0x92, 0xe8, 0xa6, 0x24, 0xac, 0xf6, 0xe1, 0xb6,
0x0, 0x95, 0xe3, 0x22, 0xbb, 0xfb, 0xc8, 0x45, 0xe5, 0xb2, 0x69,
0x95, 0xfe, 0x7d, 0x7c, 0x84, 0x13, 0x74, 0xd1, 0xff, 0x58, 0x98,
0xc9, 0x2e, 0xe0, 0x63, 0x6b, 0x6, 0x72, 0x73, 0x21, 0xc9, 0x2a,
0x60, 0x39, 0x7, 0x3, 0x53, 0x49, 0xcc, 0xbb, 0x1b, 0x92, 0xb7,
0xb0, 0x5, 0x7e, 0x8f, 0xa8, 0x7f, 0xce, 0xbc, 0x7e, 0x88, 0x65,
0x6f, 0xcb, 0x45, 0xae, 0x4, 0xbc, 0x34, 0xca, 0xbe, 0xae, 0xbe,
0x79, 0xd9, 0x17, 0x50, 0xc0, 0xe8, 0xbf, 0x13, 0xb9, 0x66, 0x50,
0x4d, 0x13, 0x43, 0x59, 0x72, 0x65, 0xdd, 0x88, 0x65, 0xad, 0xf9,
0x14, 0x9, 0xcc, 0x9b, 0x20, 0xd5, 0xf4, 0x74, 0x44, 0x4, 0x1f,
0x97, 0xb6, 0x99, 0xdd, 0xfb, 0xde, 0xe9, 0x1e, 0xa8, 0x7b, 0xd0,
0x9b, 0xf8, 0xb0, 0x2d, 0xa7, 0x5a, 0x96, 0xe9, 0x47, 0xf0, 0x7f,
0x5b, 0x65, 0xbb, 0x4e, 0x6e, 0xfe, 0xfa, 0xa1, 0x6a, 0xbf, 0xd9,
0xfb, 0xf6});
}
current_position_ = 0;
current_state_ = kFlag_NU;
begin_position_ = 0;
metaAd<false>(label);
}
template <bool kMore, typename T, size_t N>
void ad(const T (&src)[N]) {
beginOp<kMore, kFlag_A>();
absorb(src);
}
template <bool kMore>
void ad(const uint8_t *src, size_t len) {
beginOp<kMore, kFlag_A>();
absorb(src, len);
}
template <bool kMore, typename T, size_t N>
void metaAd(const T (&label)[N]) {
beginOp<kMore, kFlag_M | kFlag_A>();
absorb(label);
}
template <bool kMore, typename T, size_t N>
void prf(T (&data)[N]) {
beginOp<kMore, kFlag_I | kFlag_A | kFlag_C>();
squeeze(data);
}
template <bool kMore, typename T, size_t N>
void key(const T (&data)[N]) {
beginOp<kMore, kFlag_A | kFlag_C>();
overwrite(data);
}
auto data() const {
return std::span(as<const uint8_t>(), count<uint8_t>() + 3ull);
}
};
} // namespace kagome::primitives