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Certainly! Here's an expanded and optimized version of the code:

```cpp
#include <iostream>
#include <vector>
#include <string>
#include <sstream>
#include <iomanip>
#include <openssl/evp.h>
#include <openssl/rsa.h>
#include <openssl/ec.h>
#include <openssl/rand.h>
#include <openssl/sha.h>
#include <openssl/ssl.h>
#include <openssl/bio.h>
#include <openssl/pem.h>
#include <ctime>

// Define a structure for nodes in the reticulum
struct Node {
    std::string name;
    int id;
    std::vector<Node*> connections;
};

// Function to convert a number to a string
template <typename T>
std::string toString(const T& value) {
    std::ostringstream oss;
    oss << value;
    return oss.str();
}

// Function to iterate through the nodes in the reticulum using nested loops
void iterateReticulum(const std::vector<Node*>& reticulum) {
    for (const Node* node : reticulum) {
        std::cout << "Node ID: " << node->id << ", Name: " << node->name << std::endl;
        
        for (const Node* connection : node->connections) {
            std::cout << "Connected to Node ID: " << connection->id << ", Name: " << connection->name << std::endl;
        }
    }
}

// Function to perform encryption using OpenSSL
std::string encrypt(const std::string& data, const std::string& publicKeyPath) {
    // Load the public key from file
    FILE* file = fopen(publicKeyPath.c_str(), "rb");
    if (!file) {
        std::cerr << "Failed to open public key file" << std::endl;
        return "";
    }
    EVP_PKEY* publicKey = PEM_read_PUBKEY(file, nullptr, nullptr, nullptr);
    fclose(file);
    
    // Initialize the encryption context
    EVP_CIPHER_CTX* ctx = EVP_CIPHER_CTX_new();
    if (!ctx) {
        std::cerr << "Failed to create encryption context" << std::endl;
        EVP_PKEY_free(publicKey);
        return "";
    }
    
    // Initialize the encryption operation with the public key
    if (EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), nullptr, nullptr, nullptr) != 1) {
        std::cerr << "Failed to initialize encryption operation" << std::endl;
        EVP_PKEY_free(publicKey);
        EVP_CIPHER_CTX_free(ctx);
        return "";
    }
    
    // Set the public key for the encryption operation
    if (EVP_EncryptInit_ex(ctx, nullptr, nullptr, EVP_PKEY_get0_RSA(publicKey), nullptr) != 1) {
        std::cerr << "Failed to set public key" << std::endl;
        EVP_PKEY_free(publicKey);
        EVP_CIPHER_CTX_free(ctx);
        return "";
    }
    
    // Get the size of the encrypted output buffer
    int encryptedSize = EVP_PKEY_size(publicKey) + EVP_MAX_BLOCK_LENGTH;
    
    // Create the output buffer
    std::string encryptedData(encryptedSize, '\0');
    
    // Encrypt the data
    int actualEncryptedSize;
    if (EVP_EncryptUpdate(ctx, reinterpret_cast<unsigned char*>(encryptedData.data()), &actualEncryptedSize,
                         reinterpret_cast<const unsigned char*>(data.c_str()), data.size()) != 1 ||
        EVP_EncryptFinal_ex(ctx, reinterpret_cast<unsigned char*>(encryptedData.data()) + actualEncryptedSize,
                            &actualEncryptedSize) != 1) {
        std::cerr << "Encryption failed" << std::endl;
        EVP_PKEY_free(publicKey);
        EVP_CIPHER_CTX_free(ctx);
        return "";
    }
    
    // Resize the output buffer to the actual encrypted size
    encryptedData.resize(actualEncryptedSize);
    
    // Clean up
    EVP_PKEY_free(publicKey);
    EVP_CIPHER_CTX_free(ctx);
    
    return encryptedData;
}

int main() {
    // Create some nodes in the reticulum
    Node node1{ "Node 1", 1 };
    Node node2{ "Node 2", 2 };
    Node node3{ "Node 3", 3 };
    
    // Connect the nodes
    node1.connections.push_back(&node2);
    node1.connections.push_back(&node3);
    node2.connections.push_back(&node1);
    node3.connections.push_back(&node1);
    
    // Iterate through the reticulum
    iterateReticulum({ &node1, &node2, &node3 });
    
    // Encrypt some data
    std::string data = "Hello, world!";
    std::string publicKeyPath = "public_key.pem";
    std