gnutls/README.md

gnutls

This is a gnutls binding for golang.

see doc here

usage example

TLS client example

addr := "127.0.0.1:9443"
c, err := gnutls.Dial("tcp", addr, &gnutls.Config{
    ServerName: "localhost",
    InsecureSkipVerify: true,
    })
if err != nil {
	log.Fatal("gnutls dial ", err)
}
defer c.Close()

data := "hello, world"
if _, err = c.Write([]byte(data)); err != nil {
	log.Fatal("gnutls write ", err)
}
buf := make([]byte, 100)
n, err := c.Read(buf)
if err != nil {
	log.Fatal("gnutls read ", err)
}

TLS Server example

cert, err := gnutls.LoadX509KeyPair(
    "testdata/server/crt", "testdata/server.key")
if err != nil{
	// handle error
}
l, err := gnults.Listen("tcp", "127.0.0.1:9443", &gnutls.Config{
	Certificates: []*gnutls.Certificate{cert},
})
if err != nil {
	// handle error
}
defer l.Close()
for {
	c, err := l.Accept()
	if err != nil {
		log.Println("gnutls accept ", err)
		break
	}
	log.Println("accept connection from ", c.RemoteAddr())
	go func(c net.Conn) {
		defer c.Close()

		buf := make([]byte, 4096)
		for {
			n, err := c.Read(buf[0:])
			if err != nil {
				log.Println("gnutls read ", err)
				break
			}
			if _, err := c.Write(buf[:n]); err != nil {
				log.Println("gnutls write ", err)
				break
			}
		}
	}(c)
}

AES encrypt/decrypt example

key := []byte("0123456789abcdef")
iv := []byte("abcdefg123456789")
c, err := gnutls.NewCipher(gnutls.GNUTLS_CIPHER_AES_128_CBC, key, iv)
if err != nil {
	log.Fatal(err)
}
defer c.Close()

c1, err := gnutls.NewCipher(gnutls.GNUTLS_CIPHER_AES_128_CBC, key, iv)
if err != nil {
	log.Fatal(err)
}
defer c1.Close()

data := []byte("1234012121212121")
if c == nil {
	log.Fatal("new ciphoer failed")
}

// encrypt
dst := make([]byte, len(data))
err := c.Encrypt(dst, data)
if err != nil {
	log.Fatal("encrypt failed", err)
}

// decrypt
data1 := make([]byte, len(data))
err := c1.Decrypt(data1, cdata)
if err != nil {
	log.Fatal("decrypt failed", err)
}

Hash example

h := gnutls.NewHash(gnutls.GNUTLS_HASH_SHA512)
defer h.Close()

data := []byte("1234")

h1 := h.Sum(data)