golang使用ssl自签证书通信

证书是自签名生成的，另外lets encrypt证书免费发放，而且众多大厂都已经开始支持了，不过这只是个例子，无所谓验证有效和权威性了

服务器端

package main

import (
	"crypto/rand"
	"crypto/tls"
	"fmt"
	"log"
	"net"
	"time"
)

func HandleClientConnect(conn net.Conn) {
	defer conn.Close()
	fmt.Println("Receive Connect Request From ", conn.RemoteAddr().String())
	buffer := make([]byte, 1024)
	for {
		len, err := conn.Read(buffer)
		if err != nil {
			log.Println(err.Error())
			break
		}
		fmt.Printf("Receive Data: %s\n", string(buffer[:len]))
		//发送给客户端
		_, err = conn.Write([]byte("服务器收到数据:" + string(buffer[:len])))
		if err != nil {
			break
		}
	}
	fmt.Println("Client " + conn.RemoteAddr().String() + " Connection Closed.....")
}

func main() {
	crt, err := tls.LoadX509KeyPair("server.crt", "server.key")
	if err != nil {
		log.Fatalln(err.Error())
	}
	tlsConfig := &tls.Config{}
	tlsConfig.Certificates = []tls.Certificate{crt}
	// Time returns the current time as the number of seconds since the epoch.
	// If Time is nil, TLS uses time.Now.
	tlsConfig.Time = time.Now
	// Rand provides the source of entropy for nonces and RSA blinding.
	// If Rand is nil, TLS uses the cryptographic random reader in package
	// crypto/rand.
	// The Reader must be safe for use by multiple goroutines.
	tlsConfig.Rand = rand.Reader
	l, err := tls.Listen("tcp", "localhost:8888", tlsConfig)
	if err != nil {
		log.Fatalln(err.Error())
	}
	for {
		conn, err := l.Accept()
		if err != nil {
			fmt.Println(err.Error())
			continue
		} else {
			go HandleClientConnect(conn)
		}
	}

}

客户端

package main

import (
	"crypto/tls"
	"fmt"
	"io"
	"time"
	"log"
)

func main() {
	//注意这里要使用证书中包含的主机名称
	tlsConfig := &tls.Config{InsecureSkipVerify: true}
	conn, err := tls.Dial("tcp", "localhost:8888", tlsConfig)
	if err != nil {
		log.Fatalln(err.Error())
	}
	defer conn.Close()
	log.Println("Client Connect To ", conn.RemoteAddr())
	status := conn.ConnectionState()
	fmt.Printf("%#v\n", status)
	buf := make([]byte, 1024)
	ticker := time.NewTicker(1 * time.Millisecond * 500)
	for {
		select {
		case <-ticker.C:
			{
				_, err = io.WriteString(conn, "hello")
				if err != nil {
					log.Fatalln(err.Error())
				}
				len, err := conn.Read(buf)
				if err != nil {
					fmt.Println(err.Error())
				} else {
					fmt.Println("Receive From Server:", string(buf[:len]))
				}
			}
		}
	}

}