SSLClient for Windows

SSLClient.cpp

#include <stdio.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
// include order is important.
using namespace std;

#pragma comment (lib, "Ws2_32.lib")

#pragma comment (lib, "crypt32")
#pragma comment (lib, "libcryptoMT.lib")
#pragma comment (lib, "libsslMT.lib")
// https://www.npcglib.org/~stathis/blog/precompiled-openssl/ this link might be helpful

SSL *ssl;
int sock;

int RecvPacket()
{
	int len=100;
	char buf[1000000];
	do {
		len=SSL_read(ssl, buf, 100);
		buf[len]=0;
		printf(buf);
	} while (len > 0);
	if (len < 0) {
		int err = SSL_get_error(ssl, len);
		if (err == SSL_ERROR_WANT_READ)
			return 0;
		if (err == SSL_ERROR_WANT_WRITE)
			return 0;
		if (err == SSL_ERROR_ZERO_RETURN || err == SSL_ERROR_SYSCALL || err == SSL_ERROR_SSL)
			return -1;
	}
}

int SendPacket(const char *buf)
{
	int len = SSL_write(ssl, buf, strlen(buf));
	if (len < 0) {
		int err = SSL_get_error(ssl, len);
		switch (err) {
		case SSL_ERROR_WANT_WRITE:
			return 0;
		case SSL_ERROR_WANT_READ:
			return 0;
		case SSL_ERROR_ZERO_RETURN:
		case SSL_ERROR_SYSCALL:
		case SSL_ERROR_SSL:
		default:
			return -1;
		}
	}
}


void log_ssl()
{
	int err;
	while (err = ERR_get_error()) {
		char *str = ERR_error_string(err, 0);
		if (!str)
			return;
		printf(str);
		printf("\n");
		fflush(stdout);
	}
}


int main(int argc, char *argv[])
{
	WSADATA wsaData;
	if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
		printf("error\n");
		return 0;
	}
	
	int s;
	s = socket(AF_INET, SOCK_STREAM, 0);
	if (!s) {
		printf("Error creating socket.\n");
		return -1;
	}
	struct sockaddr_in sa;
	memset (&sa, 0, sizeof(sa));
	sa.sin_family      = AF_INET;
	sa.sin_addr.s_addr = inet_addr("172.217.27.132"); // address of www.google.com
	sa.sin_port        = htons (443); 
	socklen_t socklen = sizeof(sa);
	if (connect(s, (struct sockaddr *)&sa, socklen)) {
		printf("Error connecting to server.\n");
		return -1;
	}
	SSL_library_init();
	SSLeay_add_ssl_algorithms();
	SSL_load_error_strings();
	const SSL_METHOD *meth = TLSv1_2_client_method();
	SSL_CTX *ctx = SSL_CTX_new (meth);
	ssl = SSL_new (ctx);
	if (!ssl) {
		printf("Error creating SSL.\n");
		log_ssl();
		return -1;
	}
	sock = SSL_get_fd(ssl);
	SSL_set_fd(ssl, s);
	int err = SSL_connect(ssl);
	if (err <= 0) {
		printf("Error creating SSL connection.	err=%x\n", err);
		log_ssl();
		fflush(stdout);
		return -1;
	}
	printf ("SSL connection using %s\n", SSL_get_cipher (ssl));

	char *request = "GET / HTTP/1.0\r\n\r\n";
	SendPacket(request);
	RecvPacket();
	
	WSACleanup();
	return 0;
}

good shit 👌
tho you can use TLS_client_method instead of TLSv1_2_client_method