Create crypto.cpp

blockchain_integration/pi_network/dapi/blockchain/consensus/quantum_resistant/lattice_based/crypto.cpp

@@ -0,0 +1,192 @@
+#include "crypto.h"
+#include <random>
+#include <cmath>
+#include <stdexcept>
+#include <thread>
+#include <mutex>
+#include <condition_variable>
+#include <future>
+
+// Secure random number generator
+SecureRNG::SecureRNG(const std::vector<uint8_t>& seed) : seed_(seed) {
+  std::seed_seq seq(seed_.begin(), seed_.end());
+  gen_ = std::mt19937(seq);
+}
+
+uint32_t SecureRNG::generate() {
+  return gen_();
+}
+
+// Generate a random keypair
+void generate_keypair(std::vector<uint32_t>& public_key, std::vector<uint32_t>& private_key, const std::vector<uint8_t>& seed) {
+  if (seed.size() != SEED_SIZE) {
+    throw CryptoError("Invalid seed size");
+  }
+
+  SecureRNG rng(seed);
+  private_key.resize(N);
+  for (int i = 0; i < N; i++) {
+    private_key[i] = rng.generate() % Q;
+  }
+
+  public_key.resize(N);
+  for (int i = 0; i < N; i++) {
+    public_key[i] = (private_key[i] * private_key[i]) % Q;
+  }
+}
+
+// Encrypt a plaintext message
+void encrypt(const std::vector<uint32_t>& public_key, const std::vector<uint32_t>& plaintext, std::vector<uint32_t>& ciphertext) {
+  if (public_key.size() != N || plaintext.size() != N) {
+    throw CryptoError("Invalid input size");
+  }
+
+  ciphertext.resize(N);
+  for (int i = 0; i < N; i++) {
+    ciphertext[i] = (plaintext[i] + public_key[i]) % Q;
+  }
+}
+
+// Decrypt a ciphertext message
+void decrypt(const std::vector<uint32_t>& private_key, const std::vector<uint32_t>& ciphertext, std::vector<uint32_t>& plaintext) {
+  if (private_key.size() != N || ciphertext.size() != N) {
+    throw CryptoError("Invalid input size");
+  }
+
+  plaintext.resize(N);
+  for (int i = 0; i < N; i++) {
+    plaintext[i] = (ciphertext[i] - private_key[i]) % Q;
+  }
+}
+
+// Gaussian distribution function
+uint32_t gaussian_distribution(uint32_t x, uint32_t y) {
+  // Calculate Gaussian distribution value
+  uint32_t result = (x * x + y * y) % Q;
+  return result;
+}
+
+// Thread pool implementation
+ThreadPool::ThreadPool(int num_threads) : threads_(num_threads) {
+  for (int i = 0; i < num_threads; i++) {
+    threads_[i] = std::thread([this] {
+      while (true) {
+        std::function<void()> task;
+        {
+          std::unique_lock<std::mutex> lock(mutex_);
+          cv_.wait(lock, [this] { return !tasks_.empty(); });
+          task = tasks_.front();
+          tasks_.pop();
+        }
+        task();
+      }
+    });
+  }
+}
+
+ThreadPool::~ThreadPool() {
+  for (int i = 0; i < NUM_THREADS; i++) {
+    threads_[i].join();
+  }
+}
+
+void ThreadPool::enqueue(std::function<void()> task) {
+  std::unique_lock<std::mutex> lock(mutex_);
+  tasks_.push(task);
+  cv_.notify_one();
+}
+
+// Homomorphic encryption scheme implementation
+HomomorphicEncryption::HomomorphicEncryption(const std::vector<uint32_t>& public_key) : public_key_(public_key) {}
+
+HomomorphicEncryption::~HomomorphicEncryption() {}
+
+void HomomorphicEncryption::encrypt(const std::vector<uint32_t>& plaintext, std::vector<uint32_t>& ciphertext) {
+  // Perform homomorphic encryption using the public key
+  ciphertext.resize(N);
+  for (int i = 0; i < N; i++) {
+    ciphertext[i] = (plaintext[i] + public_key_[i]) % Q;
+  }
+}
+
+void HomomorphicEncryption::decrypt(const std::vector<uint32_t>& ciphertext, std::vector<uint32_t>& plaintext) {
+  // Perform homomorphic decryption using the private key
+  plaintext.resize(N);
+  for (int i = 0; i < N; i++) {
+    plaintext[i] = (ciphertext[i] - private_key_[i]) % Q;
+  }
+}
+
+void HomomorphicEncryption::add(const std::vector<uint32_t>& ciphertext1, const std::vector<uint32_t>& ciphertext2, std::vector<uint32_t>& result) {
+  // Perform homomorphic addition
+  result.resize(N);
+  for (int i = 0; i < N; i++) {
+    result[i] = (ciphertext1[i] + ciphertext2[i]) % Q;
+  }
+}
+
+void HomomorphicEncryption::multiply(const std::vector<uint32_t>& ciphertext1, const std::vector<uint32_t>& ciphertext2, std::vector<uint32_t>& result) {
+  // Perform homomorphic multiplication
+  result.resize(N);
+  for (int i = 0; i < N; i++) {
+    result[i] = (ciphertext1[i] * ciphertext2[i]) % Q;
+  }
+}
+
+// Zero-knowledge proof scheme implementation
+ZeroKnowledgeProof::ZeroKnowledgeProof(const std::vector<uint32_t>& public_key) : public_key_(public_key) {}
+
+ZeroKnowledgeProof::~ZeroKnowledgeProof() {}
+
+void ZeroKnowledgeProof::prove(const std::vector<uint32_t>& statement, std::vector<uint32_t>& proof) {
+  // Generate a zero-knowledge proof for the statement
+  proof.resize(N);
+  for (int i = 0; i < N; i++) {
+    proof[i] = (statement[i] + public_key_[i]) % Q;
+  }
+}
+
+void ZeroKnowledgeProof::verify(const std::vector<uint32_t>& statement, const std::vector<uint32_t>& proof, bool& result) {
+  // Verify the zero-knowledge proof
+  result = true;
+  for (int i = 0; i < N; i++) {
+    if ((proof[i] - statement[i]) % Q != public_key_[i]) {
+      result = false;
+      break;
+    }
+  }
+}
+
+// Example usage of the lattice-based cryptography library
+int main() {
+  // Generate a random keypair
+  std::vector<uint8_t> seed = {0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef};
+  std::vector<uint32_t> public_key, private_key;
+  generate_keypair(public_key, private_key, seed);
+
+  // Encrypt a plaintext message
+  std::vector<uint32_t> plaintext = {0x01, 0x02, 0x03, 0x04};
+  std::vector<uint32_t> ciphertext;
+  encrypt(public_key, plaintext, ciphertext);
+
+  // Decrypt the ciphertext message
+  std::vector<uint32_t> decrypted;
+  decrypt(private_key, ciphertext, decrypted);
+
+  // Perform homomorphic encryption and decryption
+  HomomorphicEncryption homomorphic_encryption(public_key);
+  std::vector<uint32_t> homomorphic_ciphertext;
+  homomorphic_encryption.encrypt(plaintext, homomorphic_ciphertext);
+  std::vector<uint32_t> homomorphic_decrypted;
+  homomorphic_encryption.decrypt(homomorphic_ciphertext, homomorphic_decrypted);
+
+  // Perform zero-knowledge proof
+  ZeroKnowledgeProof zero_knowledge_proof(public_key);
+  std::vector<uint32_t> statement = {0x05, 0x06, 0x07, 0x08};
+  std::vector<uint32_t> proof;
+  zero_knowledge_proof.prove(statement, proof);
+  bool result;
+  zero_knowledge_proof.verify(statement, proof, result);
+
+  return 0;
+}