devendranaga

/**
 * @description GCD in C++
 *
 * @copyright 2019-present Devendra Naga (devnaga@tuta.io) All rights reserved
 */
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <thread>

devendranaga

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <mbedtls/hkdf.h>
#include <stdint.h>
#include <string.h>

// salt is shared between server and client

devendranaga

static shared_data *shared_data::get()
{
    static shared_data sh;

    return &sh;
}

void shared_data::put_data(T &data)
{
    std::unique_lock<std::mnutex> lock(lock);

devendranaga

template <typename T>
class shared_data {
    public:
        ~shared_data() { }
        explicit shared_data(const shared_data &) = delete;
        shared_data &operator=(const shared_data &) = delete;

        // get shared object of this instance
        static shared_data *get();

devendranaga

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

struct linked_list {
    void *data;
    struct linked_list *next;
};

devendranaga

/**
 * Find current files in use for a specific process
 *
 * @Author: Devendra Naga (devendra.aaru@gmail.com)
 *
 * License MIT
 */
#include <stdio.h>
#include <string.h>
#include <unistd.h>

devendranaga

/**
 * 
 * HMAC tutorial
 * 
 * Written by Devendra Naga (devendra.aaru@gmail.com)
 * 
 * License MIT
 */
#include <iostream>
#include <stdint.h>

devendranaga

int verify(uint8_t *msg, size_t msglen, uint8_t *signature, size_t signature_len, std::string sha_alg)
{
    if (!msg || !signature) {
        std::cerr << "invalid msg or signature" << std::endl;
        return -1;
    }

    const EVP_MD *md;

    if (sha_alg == "sha256") {

devendranaga

int sign(uint8_t *msg, size_t msglen, std::string sha_alg)
{
    if (!evp_sign_key || !privatekey) {
        std::cerr << "invalid sign key or private key is not loaded" << std::endl;
        return -1;
    }

    const EVP_MD *md;

    // mark the sha alg to use

devendranaga

int load_privkey(std::string privkey)
{
    FILE *fp;

    fp = fopen(privkey.c_str(), "r");
    if (!fp) {
        return -1;
    }

    privatekey = PEM_read_ECPrivateKey(fp, NULL, NULL, NULL);