An enhanced version of the #codemesh2014 talk on network programming in Go. It covers HTTP, HTTPS, TCP/IP, TCP/IP over TLS, UDP and basic cryptographic functions with AES-CBC and RSA.

1. go
for the paranoid network programmer
@feyeleanor
1go for the would-be network programmer http://slides.games-with-brains.net/

2. twitter://@feyeleanor
go for the would-be network programmer http://slides.games-with-brains.net/

3. high voltage
networking
concurrency
cryptography
go for the would-be network programmer http://slides.games-with-brains.net/

4. http
4go for the would-be network programmer http://slides.games-with-brains.net/

5. package main
import (
. "fmt"
"net/http"
)
const MESSAGE = "hello world"
const ADDRESS = ":1024"
func main() {
http.HandleFunc("/hello", Hello)
if e := http.ListenAndServe(ADDRESS, nil); e != nil {
Println(e)
}
}
func Hello(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, MESSAGE)
}
go for the would-be network programmer http://slides.games-with-brains.net/5

6. package main
import (
. "fmt"
"net/http"
)
const MESSAGE = "hello world"
const ADDRESS = ":1024"
func main() {
http.HandleFunc("/hello", Hello)
if e := http.ListenAndServe(ADDRESS, nil); e != nil {
Println(e)
}
}
func Hello(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, MESSAGE)
}
go for the would-be network programmer http://slides.games-with-brains.net/6

7. package main
import (
. "fmt"
"net/http"
)
const MESSAGE = "hello world"
const ADDRESS = ":1024"
func main() {
http.HandleFunc("/hello", Hello)
if e := http.ListenAndServe(ADDRESS, nil); e != nil {
Println(e)
}
}
func Hello(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, MESSAGE)
}
go for the would-be network programmer http://slides.games-with-brains.net/7

8. package main
import (
. "fmt"
. "net/http"
)
const MESSAGE = "hello world"
const ADDRESS = ":1024"
func main() {
HandleFunc("/hello", Hello)
if e := ListenAndServe(ADDRESS, nil); e != nil {
Println(e)
}
}
func Hello(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, MESSAGE)
}
go for the would-be network programmer http://slides.games-with-brains.net/8

9. package main
import (
. "fmt"
. ”net/http"
)
const MESSAGE = "hello world"
const ADDRESS = ":1024"
func main() {
HandleFunc("/hello", Hello)
if e := ListenAndServe(ADDRESS, nil); e != nil {
Println(e)
}
}
func Hello(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, MESSAGE)
}
go for the would-be network programmer http://slides.games-with-brains.net/9

10. package main
import (
. "fmt"
. ”net/http"
)
const MESSAGE = "hello world"
const ADDRESS = ":1024"
func main() {
HandleFunc("/hello", Hello)
if e := ListenAndServe(ADDRESS, nil); e != nil {
Println(e)
}
}
func Hello(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, MESSAGE)
}
go for the would-be network programmer http://slides.games-with-brains.net/10

11. package main
import (
. "fmt"
. ”net/http"
)
const MESSAGE = "hello world"
const ADDRESS = ":1024"
func main() {
HandleFunc("/hello", Hello)
if e := ListenAndServe(ADDRESS, nil); e != nil {
Println(e)
}
}
func Hello(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, MESSAGE)
}
go for the would-be network programmer http://slides.games-with-brains.net/11

12. package main
import (
. "fmt"
. ”net/http"
)
const MESSAGE = "hello world"
const ADDRESS = ":1024"
func main() {
HandleFunc("/hello", Hello)
if e := ListenAndServe(ADDRESS, nil); e != nil {
Println(e)
}
}
func Hello(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, MESSAGE)
}
go for the would-be network programmer http://slides.games-with-brains.net/12

13. package main
import (
. "fmt"
. ”net/http"
)
const MESSAGE = "hello world"
const ADDRESS = ":1024"
func main() {
HandleFunc("/hello", Hello)
if e := ListenAndServe(ADDRESS, nil); e != nil {
Println(e)
}
}
func Hello(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, MESSAGE)
}
go for the would-be network programmer http://slides.games-with-brains.net/13

14. package main
import (
. "fmt"
. "net/http"
)
const MESSAGE = "hello world"
const ADDRESS = ":1024"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, MESSAGE)
})
ListenAndServe(ADDRESS, nil)
}
go for the would-be network programmer http://slides.games-with-brains.net/14

15. package main
import (
. "fmt"
. "net/http"
)
const MESSAGE = "hello world"
const ADDRESS = ":1024"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, MESSAGE)
})
ListenAndServe(ADDRESS, nil)
}
go for the would-be network programmer http://slides.games-with-brains.net/15

16. https
16go for the would-be network programmer http://slides.games-with-brains.net/

17. package main
import (
. "fmt"
. "net/http"
)
const ADDRESS = ":1025"
func main() {
message := "hello world"
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, message)
})
ListenAndServeTLS(ADDRESS, "cert.pem", "key.pem", nil)
}
go for the would-be network programmer http://slides.games-with-brains.net/17

18. package main
import (
. "fmt"
. "net/http"
)
const ADDRESS = ":1025"
func main() {
message := "hello world"
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, message)
})
ListenAndServeTLS(ADDRESS, "cert.pem", "key.pem", nil)
}
go for the would-be network programmer http://slides.games-with-brains.net/18

19. package main
import (
. "fmt"
. "net/http"
)
const ADDRESS = ":1025"
func main() {
message := "hello world"
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, message)
})
ListenAndServeTLS(ADDRESS, "cert.pem", "key.pem", nil)
}
go for the would-be network programmer http://slides.games-with-brains.net/19

20. package main
import (
. "fmt"
. "net/http"
)
const ADDRESS = ":1025"
func main() {
message := "hello world"
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, message)
})
ListenAndServeTLS(ADDRESS, "cert.pem", "key.pem", nil)
}
go for the would-be network programmer http://slides.games-with-brains.net/20

21. multiple http servers
21go for the would-be network programmer http://slides.games-with-brains.net/

22. package main
import . "fmt"
import . "net/http"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, "hello world")
})
done := make(chan bool)
go func() {
ListenAndServe(":1024", nil)
done <- true
}()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
<- done
}
go for the would-be network programmer http://slides.games-with-brains.net/22

23. package main
import . "fmt"
import . "net/http"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, "hello world")
})
done := make(chan bool)
go func() {
ListenAndServe(":1024", nil)
done <- true
}()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
<- done
}
go for the would-be network programmer http://slides.games-with-brains.net/23

24. package main
import . "fmt"
import . "net/http"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, "hello world")
})
done := make(chan bool)
go func() {
ListenAndServe(":1024", nil)
done <- true
}()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
<- done
}
go for the would-be network programmer http://slides.games-with-brains.net/24

25. package main
import . "fmt"
import . "net/http"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, "hello world")
})
done := make(chan bool)
go func() {
ListenAndServe(":1024", nil)
done <- true
}()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
<- done
}
go for the would-be network programmer http://slides.games-with-brains.net/25

26. package main
import . "fmt"
import . "net/http"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, "hello world")
})
done := make(chan bool)
go func() {
ListenAndServe(":1024", nil)
done <- true
}()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
<- done
}
go for the would-be network programmer http://slides.games-with-brains.net/26

27. package main
import . "fmt"
import . "net/http"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, "hello world")
})
done := make(chan bool)
go func() {
ListenAndServe(":1024", nil)
done <- true
}()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
<- done
}
go for the would-be network programmer http://slides.games-with-brains.net/27

28. package main
import . "fmt"
import . "net/http"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, "hello world")
})
done := make(chan bool)
go func() {
ListenAndServe(":1024", nil)
done <- true
}()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
<- done
}
go for the would-be network programmer http://slides.games-with-brains.net/28

29. package main
import . "fmt"
import . "net/http"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, "hello world")
})
done := make(chan bool)
go func() {
ListenAndServe(":1024", nil)
done <- true
}()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
<- done
}
go for the would-be network programmer http://slides.games-with-brains.net/29

30. package main
import . "fmt"
import . "net/http"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, "hello world")
})
done := make(chan bool)
go func() {
ListenAndServe(":1024", nil)
done <- true
}()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
<- done
}
go for the would-be network programmer http://slides.games-with-brains.net/30

31. package main
import . "fmt"
import . "net/http"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, "hello world")
})
Spawn(
func() {
ListenAndServe(":1024", nil)
},
func() {
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
},
)
}
go for the would-be network programmer http://slides.games-with-brains.net/31

32. package main
import . "fmt"
import . "net/http"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, "hello world")
})
Spawn(func() {
ListenAndServe(":1024", nil)
})
Spawn(func() {
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
})
}
go for the would-be network programmer http://slides.games-with-brains.net/32

33. package main
func Spawn(f ...func()) {
done := make(chan bool)
for _, s := range f {
go func(server func()) {
server()
done <- true
}(s)
}
for l := len(f); l > 0; l-- {
<- done
}
}
go for the would-be network programmer http://slides.games-with-brains.net/33

34. package main
func Spawn(f ...func()) {
done := make(chan bool)
for _, s := range f {
go func(server func()) {
server()
done <- true
}(s)
}
for l := len(f); l > 0; l-- {
<- done
}
}
go for the would-be network programmer http://slides.games-with-brains.net/34

35. package main
func Spawn(f ...func()) {
done := make(chan bool)
for _, s := range f {
go func(server func()) {
server()
done <- true
}(s)
}
for l := len(f); l > 0; l-- {
<- done
}
}
go for the would-be network programmer http://slides.games-with-brains.net/35

36. package main
func Spawn(f ...func()) {
done := make(chan bool)
for _, s := range f {
go func(server func()) {
server()
done <- true
}(s)
}
for l := len(f); l > 0; l-- {
<- done
}
}
go for the would-be network programmer http://slides.games-with-brains.net/36

37. package main
func Spawn(f ...func()) {
done := make(chan bool)
for _, s := range f {
go func(server func()) {
server()
done <- true
}(s)
}
for l := len(f); l > 0; l-- {
<- done
}
}
go for the would-be network programmer http://slides.games-with-brains.net/37

38. package main
func Spawn(f ...func()) {
done := make(chan bool)
for _, s := range f {
go func(server func()) {
server()
done <- true
}(s)
}
for l := len(f); l > 0; l-- {
<- done
}
}
go for the would-be network programmer http://slides.games-with-brains.net/38

39. package main
func Spawn(f ...func()) {
done := make(chan bool)
for _, s := range f {
go func(server func()) {
server()
done <- true
}(s)
}
for l := len(f); l > 0; l-- {
<- done
}
}
go for the would-be network programmer http://slides.games-with-brains.net/39

40. waitgroups
40go for the would-be network programmer http://slides.games-with-brains.net/

41. package main
import . "fmt"
import . "net/http"
import "sync"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {})
var servers sync.WaitGroup
servers.Add(1)
go func() {
defer servers.Done()
ListenAndServe(":1024", nil)
}()
servers.Add(1)
go func() {
defer servers.Done()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
}()
servers.Wait()
}
go for the would-be network programmer http://slides.games-with-brains.net/41

42. package main
import . "fmt"
import . "net/http"
import "sync"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {})
var servers sync.WaitGroup
servers.Add(1)
go func() {
defer servers.Done()
ListenAndServe(":1024", nil)
}()
servers.Add(1)
go func() {
defer servers.Done()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
}()
servers.Wait()
}
go for the would-be network programmer http://slides.games-with-brains.net/42

43. package main
import . "fmt"
import . "net/http"
import "sync"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {})
var servers sync.WaitGroup
servers.Add(1)
go func() {
defer servers.Done()
ListenAndServe(":1024", nil)
}()
servers.Add(1)
go func() {
defer servers.Done()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
}()
servers.Wait()
}
go for the would-be network programmer http://slides.games-with-brains.net/43

44. package main
import . "fmt"
import . "net/http"
import "sync"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {})
var servers sync.WaitGroup
servers.Add(1)
go func() {
defer servers.Done()
ListenAndServe(":1024", nil)
}()
servers.Add(1)
go func() {
defer servers.Done()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
}()
servers.Wait()
}
go for the would-be network programmer http://slides.games-with-brains.net/44

45. package main
import . "fmt"
import . "net/http"
import "sync"
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {})
var servers sync.WaitGroup
servers.Add(1)
go func() {
defer servers.Done()
ListenAndServe(":1024", nil)
}()
servers.Add(1)
go func() {
defer servers.Done()
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
}()
servers.Wait()
}
go for the would-be network programmer http://slides.games-with-brains.net/45

46. package main
import . "fmt"
import . "net/http"
import "sync"
var servers sync.WaitGroup
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, "hello world")
})
Spawn(func() {
ListenAndServe(":1024", nil)
})
Spawn(func() {
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
})
servers.Wait()
}
go for the would-be network programmer http://slides.games-with-brains.net/46

47. package main
import . "fmt"
import . "net/http"
import "sync"
var servers sync.WaitGroup
func main() {
HandleFunc("/hello", func(w ResponseWriter, r *Request) {
w.Header().Set("Content-Type", "text/plain")
Fprintf(w, "hello world")
})
Spawn(func() {
ListenAndServe(":1024", nil)
})
Spawn(func() {
ListenAndServeTLS(":1025", "cert.pem", "key.pem", nil)
})
servers.Wait()
}
go for the would-be network programmer http://slides.games-with-brains.net/47

48. package main
func Spawn(f ...func()) {
for _, s := range f {
servers.Add(1)
go func(server func()) {
defer servers.Done()
server()
}(s)
}
}
go for the would-be network programmer http://slides.games-with-brains.net/48

49. package main
func Spawn(f ...func()) {
for _, s := range f {
servers.Add(1)
go func(server func()) {
defer servers.Done()
server()
}(s)
}
}
go for the would-be network programmer http://slides.games-with-brains.net/49

50. tcp server
50go for the would-be network programmer http://slides.games-with-brains.net/

51. package main
import . "fmt"
import "net"
func main() {
if listener, e := net.Listen("tcp", ":1024"); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go func(c net.Conn) {
defer c.Close()
Fprintln(c, "hello world")
}(connection)
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/51

52. package main
import . "fmt"
import "net"
func main() {
if listener, e := net.Listen("tcp", ":1024"); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go func(c net.Conn) {
defer c.Close()
Fprintln(c, "hello world")
}(connection)
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/52

53. package main
import . "fmt"
import "net"
func main() {
if listener, e := net.Listen("tcp", ":1024"); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go func(c net.Conn) {
defer c.Close()
Fprintln(c, "hello world")
}(connection)
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/53

54. package main
import . "fmt"
import "net"
func main() {
if listener, e := net.Listen("tcp", ":1024"); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go func(c net.Conn) {
defer c.Close()
Fprintln(c, "hello world")
}(connection)
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/54

55. package main
import . "fmt"
import "net"
func main() {
if listener, e := net.Listen("tcp", ":1024"); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go func(c net.Conn) {
defer c.Close()
Fprintln(c, "hello world")
}(connection)
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/55

56. package main
import . "fmt"
import "net"
func main() {
Listen("tcp", ":1024", func(c net.Conn) {
defer c.Close()
Fprintln(c, "hello world")
})
}
func Listen(p, a string, f func(net.Conn)) (e error) {
var listener net.Listener
if listener, e = net.Listen(p, a); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go f(connection)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/56

57. package main
import . "fmt"
import "net"
func main() {
Listen("tcp", ":1024", func(c net.Conn) {
defer c.Close()
Fprintln(c, "hello world")
})
}
func Listen(p, a string, f func(net.Conn)) (e error) {
var listener net.Listener
if listener, e = net.Listen(p, a); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go f(connection)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/57

58. package main
import . "fmt"
import "net"
func main() {
Listen("tcp", ":1024", func(c net.Conn) {
defer c.Close()
Fprintln(c, "hello world")
})
}
func Listen(p, a string, f func(net.Conn)) (e error) {
var listener net.Listener
if listener, e = net.Listen(p, a); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go f(connection)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/58

59. package main
import . "fmt"
import "net"
func main() {
Listen("tcp", ":1024", func(c net.Conn) {
defer c.Close()
Fprintln(c, "hello world")
})
}
func Listen(p, a string, f func(net.Conn)) (e error) {
var listener net.Listener
if listener, e = net.Listen(p, a); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go f(connection)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/59

60. tcp client
60go for the would-be network programmer http://slides.games-with-brains.net/

61. package main
import "bufio"
import . "fmt"
import "net"
func main() {
if c, e := net.Dial("tcp", ":1024"); e == nil {
defer c.Close()
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/61

62. package main
import "bufio"
import . "fmt"
import "net"
func main() {
if c, e := net.Dial("tcp", ":1024"); e == nil {
defer c.Close()
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/62

63. package main
import "bufio"
import . "fmt"
import "net"
func main() {
if c, e := net.Dial("tcp", ":1024"); e == nil {
defer c.Close()
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/63

64. package main
import "bufio"
import . "fmt"
import "net"
func main() {
if c, e := net.Dial("tcp", ":1024"); e == nil {
defer c.Close()
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/64

65. package main
import "bufio"
import . "fmt"
import "net"
func main() {
if c, e := net.Dial("tcp", ":1024"); e == nil {
defer c.Close()
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/65

66. package main
import "bufio"
import . "fmt"
import "net"
func main() {
if c, e := net.Dial("tcp", ":1024"); e == nil {
defer c.Close()
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/66

67. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial("tcp", ":1024", func(c net.Conn) {
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
})
}
go for the would-be network programmer http://slides.games-with-brains.net/67

68. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial("tcp", ":1024", func(c net.Conn) {
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
})
}
func Dial(p, a string, f func(net.Conn)) (e error) {
var c net.Conn
if c, e = net.Dial(p, a); e == nil {
defer c.Close()
f(c)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/68

69. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial("tcp", ":1024", func(c net.Conn) {
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
})
}
func Dial(p, a string, f func(net.Conn)) (e error) {
var c net.Conn
if c, e = net.Dial(p, a); e == nil {
defer c.Close()
f(c)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/69

70. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial("tcp", ":1024", func(c net.Conn) {
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
})
}
func Dial(p, a string, f func(net.Conn)) (e error) {
var c net.Conn
if c, e = net.Dial(p, a); e == nil {
defer c.Close()
f(c)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/70

71. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial("tcp", ":1024", func(c net.Conn) {
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
})
}
func Dial(p, a string, f func(net.Conn)) (e error) {
var c net.Conn
if c, e = net.Dial(p, a); e == nil {
defer c.Close()
f(c)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/71

72. tcp/tls server
72go for the would-be network programmer http://slides.games-with-brains.net/

73. package main
import "crypto/tls"
import . "fmt"
func main() {
Listen(":1025", ConfigTLS("scert", "skey"), func(c *tls.Conn) {
Fprintln(c, "hello world")
})
}
go for the would-be network programmer http://slides.games-with-brains.net/73

74. package main
import "crypto/tls"
import . "fmt"
func main() {
Listen(":1025", ConfigTLS("scert", "skey"), func(c *tls.Conn) {
Fprintln(c, "hello world")
})
}
go for the would-be network programmer http://slides.games-with-brains.net/74

75. package main
import "crypto/tls"
import . "fmt"
func main() {
Listen(":1025", ConfigTLS("scert", "skey"), func(c *tls.Conn) {
Fprintln(c, "hello world")
})
}
go for the would-be network programmer http://slides.games-with-brains.net/75

76. package main
import "crypto/rand"
import "crypto/tls"
func ConfigTLS(c, k string) (r *tls.Config) {
if cert, e := tls.LoadX509KeyPair(c, k); e == nil {
r = &tls.Config{
Certificates: []tls.Certificate{ cert },
Rand: rand.Reader,
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/76

77. package main
import "crypto/rand"
import "crypto/tls"
func ConfigTLS(c, k string) (r *tls.Config) {
if cert, e := tls.LoadX509KeyPair(c, k); e == nil {
r = &tls.Config{
Certificates: []tls.Certificate{ cert },
Rand: rand.Reader,
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/77

78. package main
import "crypto/rand"
import "crypto/tls"
func ConfigTLS(c, k string) (r *tls.Config) {
if cert, e := tls.LoadX509KeyPair(c, k); e == nil {
r = &tls.Config{
Certificates: []tls.Certificate{ cert },
Rand: rand.Reader,
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/78

79. package main
import "crypto/rand"
import "crypto/tls"
func ConfigTLS(c, k string) (r *tls.Config) {
if cert, e := tls.LoadX509KeyPair(c, k); e == nil {
r = &tls.Config{
Certificates: []tls.Certificate{ cert },
Rand: rand.Reader,
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/79

80. package main
import "crypto/rand"
import "crypto/tls"
func ConfigTLS(c, k string) (r *tls.Config) {
if cert, e := tls.LoadX509KeyPair(c, k); e == nil {
r = &tls.Config{
Certificates: []tls.Certificate{ cert },
Rand: rand.Reader,
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/80

81. package main
import "crypto/tls"
func Listen(a string, conf *tls.Config, f func(*tls.Conn)) {
if listener, e := tls.Listen("tcp", a, conf); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go func(c *tls.Conn) {
defer c.Close()
f(c)
}(connection.(*tls.Conn))
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/81

82. package main
import "crypto/tls"
func Listen(a string, conf *tls.Config, f func(*tls.Conn)) {
if listener, e := tls.Listen("tcp", a, conf); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go func(c *tls.Conn) {
defer c.Close()
f(c)
}(connection.(*tls.Conn))
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/82

83. package main
import "crypto/tls"
func Listen(a string, conf *tls.Config, f func(*tls.Conn)) {
if listener, e := tls.Listen("tcp", a, conf); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go func(c *tls.Conn) {
defer c.Close()
f(c)
}(connection.(*tls.Conn))
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/83

84. package main
import "crypto/tls"
func Listen(a string, conf *tls.Config, f func(*tls.Conn)) {
if listener, e := tls.Listen("tcp", a, conf); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go func(c *tls.Conn) {
defer c.Close()
f(c)
}(connection.(*tls.Conn))
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/84

85. package main
import “crypto/tls"
import "net"
func Listen(a string, conf *tls.Config, f func(net.Conn)) {
if listener, e := tls.Listen("tcp", a, conf); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go func(c net.Conn) {
defer c.Close()
f(c)
}(connection)
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/85

86. package main
import "crypto/tls"
import "net"
func Listen(a string, conf *tls.Config, f func(net.Conn)) {
if listener, e := tls.Listen("tcp", a, conf); e == nil {
for {
if connection, e := listener.Accept(); e == nil {
go func(c net.Conn) {
defer c.Close()
f(c)
}(connection)
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/86

87. tcp/tls client
87go for the would-be network programmer http://slides.games-with-brains.net/

88. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial(":1025", ConfigTLS("ccert", "ckey"), func(c net.Conn) {
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
})
}
go for the would-be network programmer http://slides.games-with-brains.net/88

89. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial(":1025", ConfigTLS("ccert", "ckey"), func(c net.Conn) {
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
})
}
go for the would-be network programmer http://slides.games-with-brains.net/89

90. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial(":1025", ConfigTLS("ccert", "ckey"), func(c net.Conn) {
if m, e := bufio.NewReader(c).ReadString('n'); e == nil {
Printf(m)
}
})
}
go for the would-be network programmer http://slides.games-with-brains.net/90

91. package main
import "crypto/tls"
func ConfigTLS(c, k string) (r *tls.Config) {
if cert, e := tls.LoadX509KeyPair(c, k); e == nil {
r = &tls.Config{
Certificates: []tls.Certificate{ cert },
InsecureSkipVerify: true,
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/91

92. package main
import "crypto/tls"
func ConfigTLS(c, k string) (r *tls.Config) {
if cert, e := tls.LoadX509KeyPair(c, k); e == nil {
r = &tls.Config{
Certificates: []tls.Certificate{ cert },
InsecureSkipVerify: true,
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/92

93. package main
import "crypto/tls"
func ConfigTLS(c, k string) (r *tls.Config) {
if cert, e := tls.LoadX509KeyPair(c, k); e == nil {
r = &tls.Config{
Certificates: []tls.Certificate{ cert },
InsecureSkipVerify: true,
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/93

94. package main
import “crypto/tls"
import "net"
func Dial(a string, conf *tls.Config, f func(net.Conn)) {
if c, e := tls.Dial("tcp", a, conf); e == nil {
defer c.Close()
f(c)
}
}
go for the would-be network programmer http://slides.games-with-brains.net/94

95. package main
import “crypto/tls"
import "net"
func Dial(a string, conf *tls.Config, f func(net.Conn)) {
if c, e := tls.Dial("tcp", a, conf); e == nil {
defer c.Close()
f(c)
}
}
go for the would-be network programmer http://slides.games-with-brains.net/95

96. udp serve
96go for the would-be network programmer http://slides.games-with-brains.net/

97. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn")
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/97

98. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn”)
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/98

99. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn")
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/99

100. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn")
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/100

101. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn")
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/101

102. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn")
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/102

103. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn")
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/103

104. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn")
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/104

105. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn")
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/105

106. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn")
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/106

107. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn")
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/107

108. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn")
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/108

109. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn")
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/109

110. package main
import "net"
func main() {
HELLO_WORLD := []byte("Hello Worldn")
Listen(":1024", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
c.WriteToUDP(HELLO_WORLD, a)
})
}
func Listen(a string, f func(*net.UDPConn, *net.UDPAddr, []byte)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.ListenUDP("udp", address); e == nil {
for b := make([]byte, 1024); ; b = make([]byte, 1024) {
if n, client, e := conn.ReadFromUDP(b); e == nil {
go f(conn, client, b[:n])
}
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/110

111. udp request
111go for the would-be network programmer http://slides.games-with-brains.net/

112. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial(":1024", func(conn net.Conn) {
if _, e := conn.Write([]byte("n")); e == nil {
if m, e := bufio.NewReader(conn).ReadString('n'); e == nil {
Printf("%v", m)
}
}
})
}
func Dial(a string, f func(net.Conn)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
f(conn)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/112

113. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial(":1024", func(conn net.Conn) {
if _, e := conn.Write([]byte("n")); e == nil {
if m, e := bufio.NewReader(conn).ReadString('n'); e == nil {
Printf("%v", m)
}
}
})
}
func Dial(a string, f func(net.Conn)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
f(conn)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/113

114. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial(":1024", func(conn net.Conn) {
if _, e := conn.Write([]byte("n")); e == nil {
if m, e := bufio.NewReader(conn).ReadString('n'); e == nil {
Printf("%v", m)
}
}
})
}
func Dial(a string, f func(net.Conn)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
f(conn)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/114

115. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial(":1024", func(conn net.Conn) {
if _, e := conn.Write([]byte("n")); e == nil {
if m, e := bufio.NewReader(conn).ReadString('n'); e == nil {
Printf("%v", m)
}
}
})
}
func Dial(a string, f func(net.Conn)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
f(conn)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/115

116. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial(":1024", func(conn net.Conn) {
if _, e := conn.Write([]byte("n")); e == nil {
if m, e := bufio.NewReader(conn).ReadString('n'); e == nil {
Printf("%v", m)
}
}
})
}
func Dial(a string, f func(net.Conn)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
f(conn)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/116

117. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial(":1024", func(conn net.Conn) {
if _, e := conn.Write([]byte("n")); e == nil {
if m, e := bufio.NewReader(conn).ReadString('n'); e == nil {
Printf("%v", m)
}
}
})
}
func Dial(a string, f func(net.Conn)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
f(conn)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/117

118. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial(":1024", func(conn net.Conn) {
if _, e := conn.Write([]byte("n")); e == nil {
if m, e := bufio.NewReader(conn).ReadString('n'); e == nil {
Printf("%v", m)
}
}
})
}
func Dial(a string, f func(net.Conn)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
f(conn)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/118

119. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial(":1024", func(conn net.Conn) {
if _, e := conn.Write([]byte("n")); e == nil {
if m, e := bufio.NewReader(conn).ReadString('n'); e == nil {
Printf("%v", m)
}
}
})
}
func Dial(a string, f func(net.Conn)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
f(conn)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/119

120. package main
import "bufio"
import . "fmt"
import "net"
func main() {
Dial(":1024", func(conn net.Conn) {
if _, e := conn.Write([]byte("n")); e == nil {
if m, e := bufio.NewReader(conn).ReadString('n'); e == nil {
Printf("%v", m)
}
}
})
}
func Dial(a string, f func(net.Conn)) {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
f(conn)
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/120

121. aes encrypt
121go for the would-be network programmer http://slides.games-with-brains.net/

122. go for the would-be network programmer http://slides.games-with-brains.net/
122
package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
const AES_KEY = "0123456789012345"
func main() {
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
if m, e := Encrypt("Hello World", AES_KEY); e == nil {
c.WriteToUDP(m, a)
}
})
}

123. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
const AES_KEY = "0123456789012345"
func main() {
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
if m, e := Encrypt("Hello World", AES_KEY); e == nil {
c.WriteToUDP(m, a)
}
return
})
}
go for the would-be network programmer http://slides.games-with-brains.net/123

124. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
const AES_KEY = "0123456789012345"
func main() {
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
if m, e := Encrypt("Hello World", AES_KEY); e == nil {
c.WriteToUDP(m, a)
}
return
})
}
go for the would-be network programmer http://slides.games-with-brains.net/124

125. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
const AES_KEY = "0123456789012345"
func main() {
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
if m, e := Encrypt("Hello World", AES_KEY); e == nil {
c.WriteToUDP(m, a)
}
return
})
}
go for the would-be network programmer http://slides.games-with-brains.net/125

126. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
const AES_KEY = "0123456789012345"
func main() {
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
if m, e := Encrypt("Hello World", AES_KEY); e == nil {
c.WriteToUDP(m, a)
}
return
})
}
go for the would-be network programmer http://slides.games-with-brains.net/126

127. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Encrypt(m, k string) (o []byte, e error) {
if o, e = Quantise([]byte(m)); e == nil {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
if iv, e = IV(); e == nil {
c := cipher.NewCBCEncrypter(b, iv)
c.CryptBlocks(o, o)
o = append(iv, o...)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/127

128. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Encrypt(m, k string) (o []byte, e error) {
if o, e = Quantise([]byte(m)); e == nil {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
if iv, e = IV(); e == nil {
c := cipher.NewCBCEncrypter(b, iv)
c.CryptBlocks(o, o)
o = append(iv, o...)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/128

129. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Encrypt(m, k string) (o []byte, e error) {
if o, e = Quantise(m); e == nil {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
if iv, e = IV(); e == nil {
c := cipher.NewCBCEncrypter(b, iv)
c.CryptBlocks(o, o)
o = append(iv, o...)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/129

130. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Quantise(m string) (b []byte, e error) {
b = append(b, m...)
if p := len(b) % aes.BlockSize; p != 0 {
p = aes.BlockSize - p
// this is insecure and inflexible as we're padding with NUL!
b = append(b, make([]byte, p)...)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/130

131. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Quantise(m string) (b []byte, e error) {
b = append(b, m...)
if p := len(b) % aes.BlockSize; p != 0 {
p = aes.BlockSize - p
// this is insecure and inflexible as we're padding with NUL!
b = append(b, make([]byte, p)...)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/131

132. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Quantise(m string) (b []byte, e error) {
b = append(b, m...)
if p := len(b) % aes.BlockSize; p != 0 {
p = aes.BlockSize - p
// this is insecure and inflexible as we're padding with NUL!
b = append(b, make([]byte, p)...)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/132

133. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Quantise(m string) (b []byte, e error) {
b = append(b, m...)
if p := len(b) % aes.BlockSize; p != 0 {
p = aes.BlockSize - p
// this is insecure and inflexible as we're padding with NUL!
b = append(b, make([]byte, p)...)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/133

134. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Quantise(m string) (b []byte, e error) {
b = append(b, m...)
if p := len(b) % aes.BlockSize; p != 0 {
p = aes.BlockSize - p
// this is insecure and inflexible as we're padding with NUL!
b = append(b, make([]byte, p)...)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/134

135. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Quantise(m string) (b []byte, e error) {
b = append(b, m...)
if p := len(b) % aes.BlockSize; p != 0 {
p = aes.BlockSize - p
// this is insecure and inflexible as we're padding with NUL!
b = append(b, make([]byte, p)...)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/135

136. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Quantise(m string) (b []byte, e error) {
b = append(b, m...)
if p := len(b) % aes.BlockSize; p != 0 {
p = aes.BlockSize - p
// this is insecure and inflexible as we're padding with NUL!
b = append(b, make([]byte, p)...)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/136

137. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Quantise(m string) (b []byte, e error) {
b = append(b, m...)
if p := len(b) % aes.BlockSize; p != 0 {
p = aes.BlockSize - p
// this is insecure and inflexible as we're padding with NUL!
b = append(b, make([]byte, p)...)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/137

138. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Encrypt(m, k string) (o []byte, e error) {
if o, e = Quantise(m); e == nil {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
if iv, e = IV(); e == nil {
c := cipher.NewCBCEncrypter(b, iv)
c.CryptBlocks(o, o)
o = append(iv, o...)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/138

139. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Encrypt(m, k string) (o []byte, e error) {
if o, e = Quantise(m); e == nil {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
if iv, e = IV(); e == nil {
c := cipher.NewCBCEncrypter(b, iv)
c.CryptBlocks(o, o)
o = append(iv, o...)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/139

140. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Encrypt(m, k string) (o []byte, e error) {
if o, e = Quantise(m); e == nil {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
if iv, e = IV(); e == nil {
c := cipher.NewCBCEncrypter(b, iv)
c.CryptBlocks(o, o)
o = append(iv, o...)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/140

141. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Encrypt(m, k string) (o []byte, e error) {
if o, e = Quantise(m); e == nil {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
if iv, e = IV(); e == nil {
c := cipher.NewCBCEncrypter(b, iv)
c.CryptBlocks(o, o)
o = append(iv, o...)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/141

142. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func IV() (b []byte, e error) {
b = make([]byte, aes.BlockSize)
_, e = rand.Read(b)
return
}
go for the would-be network programmer http://slides.games-with-brains.net/142

143. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func IV() (b []byte, e error) {
b = make([]byte, aes.BlockSize)
_, e = rand.Read(b)
return
}
go for the would-be network programmer http://slides.games-with-brains.net/143

144. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Encrypt(m, k string) (o []byte, e error) {
if o, e = Quantise(m); e == nil {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
if iv, e = IV(); e == nil {
c := cipher.NewCBCEncrypter(b, iv)
c.CryptBlocks(o, o)
o = append(iv, o...)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/144

145. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Encrypt(m, k string) (o []byte, e error) {
if o, e = Quantise(m); e == nil {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
if iv, e = IV(); e == nil {
c := cipher.NewCBCEncrypter(b, iv)
c.CryptBlocks(o, o)
o = append(iv, o...)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/145

146. package main
import "crypto/aes"
import "crypto/cipher"
import "crypto/rand"
import "net"
func Encrypt(m, k string) (o []byte, e error) {
if o, e = Quantise(m); e == nil {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
if iv, e = IV(); e == nil {
c := cipher.NewCBCEncrypter(b, iv)
c.CryptBlocks(o, o)
o = append(iv, o...)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/146

147. aes decrypt
147go for the would-be network programmer http://slides.games-with-brains.net/

148. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
const AES_KEY = "0123456789012345"
func main() {
Dial(":1025", func(c *net.UDPConn) {
c.Write(make([]byte, 1))
if m, e := ReadStream(c); e == nil {
if m, e := Decrypt(m, AES_KEY); e == nil {
Println(string(m))
}
}
})
}
go for the would-be network programmer http://slides.games-with-brains.net/148

149. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
const AES_KEY = "0123456789012345"
func main() {
Dial(":1025", func(c *net.UDPConn) {
c.Write(make([]byte, 1))
if m, e := ReadStream(c); e == nil {
if m, e := Decrypt(m, AES_KEY); e == nil {
Println(string(m))
}
}
})
}
go for the would-be network programmer http://slides.games-with-brains.net/149

150. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
const AES_KEY = "0123456789012345"
func main() {
Dial(":1025", func(c *net.UDPConn) {
c.Write(make([]byte, 1))
if m, e := ReadStream(c); e == nil {
if m, e := Decrypt(m, AES_KEY); e == nil {
Println(string(m))
}
}
})
}
go for the would-be network programmer http://slides.games-with-brains.net/150

151. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
func Decrypt(m []byte, k string) (r string, e error) {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
iv, m = Unpack(m)
c := cipher.NewCBCDecrypter(b, iv)
c.CryptBlocks(m, m)
r = Dequantise(m)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/151

152. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
func Decrypt(m []byte, k string) (r string, e error) {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
iv, m = Unpack(m)
c := cipher.NewCBCDecrypter(b, iv)
c.CryptBlocks(m, m)
r = Dequantise(m)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/152

153. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
func Decrypt(m []byte, k string) (r string, e error) {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
iv, m = Unpack(m)
c := cipher.NewCBCDecrypter(b, iv)
c.CryptBlocks(m, m)
r = Dequantise(m)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/153

154. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
func Unpack(m []byte) (iv, r []byte) {
return m[:aes.BlockSize], m[aes.BlockSize:]
}
go for the would-be network programmer http://slides.games-with-brains.net/154

155. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
func Unpack(m []byte) (iv, r []byte) {
return m[:aes.BlockSize], m[aes.BlockSize:]
}
go for the would-be network programmer http://slides.games-with-brains.net/155

156. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
func Unpack(m []byte) (iv, r []byte) {
return m[:aes.BlockSize], m[aes.BlockSize:]
}
go for the would-be network programmer http://slides.games-with-brains.net/156

157. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
func Decrypt(m []byte, k string) (r string, e error) {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
iv, m = Unpack(m)
c := cipher.NewCBCDecrypter(b, iv)
c.CryptBlocks(m, m)
r = Dequantise(m)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/157

158. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
func Decrypt(m []byte, k string) (r string, e error) {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
iv, m = Unpack(m)
c := cipher.NewCBCDecrypter(b, iv)
c.CryptBlocks(m, m)
r = Dequantise(m)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/158

159. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
func Decrypt(m []byte, k string) (r string, e error) {
var b cipher.Block
if b, e = aes.NewCipher([]byte(k)); e == nil {
var iv []byte
iv, m = Unpack(m)
c := cipher.NewCBCDecrypter(b, iv)
c.CryptBlocks(m, m)
r = Dequantise(m)
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/159

160. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
func Dequantise(m []byte) string {
var i int
for i = len(m) - 1; i > 0 && m[i] == 0; i-- {}
return string(m[:i + 1])
}
go for the would-be network programmer http://slides.games-with-brains.net/160

161. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
func Dequantise(m []byte) string {
var i int
for i = len(m) - 1; i > 0 && m[i] == 0; i-- {}
return string(m[:i + 1])
}
go for the would-be network programmer http://slides.games-with-brains.net/161

162. package main
import "crypto/cipher"
import "crypto/aes"
import . "fmt"
import "net"
func Dequantise(m []byte) string {
var i int
for i = len(m) - 1; i > 0 && m[i] == 0; i-- {}
return string(m[:i + 1])
}
go for the would-be network programmer http://slides.games-with-brains.net/162

163. rsa encrypt
163go for the would-be network programmer http://slides.games-with-brains.net/

164. package main
import . "bytes"
import "crypto/rsa"
import "encoding/gob"
import "net"
func main() {
HELLO_WORLD := []byte("Hello World")
RSA_LABEL := []byte("served")
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
var key rsa.PublicKey
if e := gob.NewDecoder(NewBuffer(b)).Decode(&key); e == nil {
if m, e := Encrypt(&key, HELLO_WORLD, RSA_LABEL); e == nil {
c.WriteToUDP(m, a)
}
}
return
})
}
go for the would-be network programmer http://slides.games-with-brains.net/164

165. package main
import . "bytes"
import "crypto/rsa"
import "encoding/gob"
import "net"
func main() {
HELLO_WORLD := []byte("Hello World")
RSA_LABEL := []byte("served")
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
var key rsa.PublicKey
if e := gob.NewDecoder(NewBuffer(b)).Decode(&key); e == nil {
if m, e := Encrypt(&key, HELLO_WORLD, RSA_LABEL); e == nil {
c.WriteToUDP(m, a)
}
}
return
})
}
go for the would-be network programmer http://slides.games-with-brains.net/165

166. package main
import . "bytes"
import "crypto/rsa"
import "encoding/gob"
import "net"
func main() {
HELLO_WORLD := []byte("Hello World")
RSA_LABEL := []byte("served")
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
var key rsa.PublicKey
if e := gob.NewDecoder(NewBuffer(b)).Decode(&key); e == nil {
if m, e := Encrypt(&key, HELLO_WORLD, RSA_LABEL); e == nil {
c.WriteToUDP(m, a)
}
}
return
})
}
go for the would-be network programmer http://slides.games-with-brains.net/166

167. package main
import . "bytes"
import "crypto/rsa"
import "encoding/gob"
import "net"
func main() {
HELLO_WORLD := []byte("Hello World")
RSA_LABEL := []byte("served")
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
var key rsa.PublicKey
if e := gob.NewDecoder(NewBuffer(b)).Decode(&key); e == nil {
if m, e := Encrypt(&key, HELLO_WORLD, RSA_LABEL); e == nil {
c.WriteToUDP(m, a)
}
}
return
})
}
go for the would-be network programmer http://slides.games-with-brains.net/167

168. package main
import . "bytes"
import "crypto/rsa"
import "encoding/gob"
import "net"
func main() {
HELLO_WORLD := []byte("Hello World")
RSA_LABEL := []byte("served")
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
var key rsa.PublicKey
if e := gob.NewDecoder(NewBuffer(b)).Decode(&key); e == nil {
if m, e := Encrypt(&key, HELLO_WORLD, RSA_LABEL); e == nil {
c.WriteToUDP(m, a)
}
}
return
})
}
go for the would-be network programmer http://slides.games-with-brains.net/168

169. package main
import . "bytes"
import "crypto/rsa"
import "encoding/gob"
import "net"
func main() {
HELLO_WORLD := []byte("Hello World")
RSA_LABEL := []byte("served")
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
var key rsa.PublicKey
if e := gob.NewDecoder(NewBuffer(b)).Decode(&key); e == nil {
if m, e := Encrypt(&key, HELLO_WORLD, RSA_LABEL); e == nil {
c.WriteToUDP(m, a)
}
}
return
})
}
go for the would-be network programmer http://slides.games-with-brains.net/169

170. package main
import . "bytes"
import "crypto/rsa"
import "encoding/gob"
import "net"
func main() {
HELLO_WORLD := []byte("Hello World")
RSA_LABEL := []byte("served")
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
var key rsa.PublicKey
if e := gob.NewDecoder(NewBuffer(b)).Decode(&key); e == nil {
if m, e := Encrypt(&key, HELLO_WORLD, RSA_LABEL); e == nil {
c.WriteToUDP(m, a)
}
}
return
})
}
go for the would-be network programmer http://slides.games-with-brains.net/170

171. package main
import . "bytes"
import "crypto/rsa"
import "encoding/gob"
import "net"
func main() {
HELLO_WORLD := []byte("Hello World")
RSA_LABEL := []byte("served")
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
var key rsa.PublicKey
if e := gob.NewDecoder(NewBuffer(b)).Decode(&key); e == nil {
if m, e := Encrypt(&key, HELLO_WORLD, RSA_LABEL); e == nil {
c.WriteToUDP(m, a)
}
}
return
})
}
go for the would-be network programmer http://slides.games-with-brains.net/171

172. package main
import . "bytes"
import "crypto/rsa"
import "encoding/gob"
import "net"
func main() {
HELLO_WORLD := []byte("Hello World")
RSA_LABEL := []byte("served")
Listen(":1025", func(c *net.UDPConn, a *net.UDPAddr, b []byte) {
var key rsa.PublicKey
if e := gob.NewDecoder(NewBuffer(b)).Decode(&key); e == nil {
if m, e := Encrypt(&key, HELLO_WORLD, RSA_LABEL); e == nil {
c.WriteToUDP(m, a)
}
}
return
})
}
go for the would-be network programmer http://slides.games-with-brains.net/172

173. package main
import "crypto/rand"
import "crypto/rsa"
import "crypto/sha1"
func Encrypt(key *rsa.PublicKey, m, l []byte) ([]byte, error) {
return rsa.EncryptOAEP(sha1.New(), rand.Reader, key, m, l)
}
go for the would-be network programmer http://slides.games-with-brains.net/173

174. package main
import "crypto/rand"
import "crypto/rsa"
import "crypto/sha1"
func Encrypt(key *rsa.PublicKey, m, l []byte) ([]byte, error) {
return rsa.EncryptOAEP(sha1.New(), rand.Reader, key, m, l)
}
go for the would-be network programmer http://slides.games-with-brains.net/174

175. package main
import "crypto/rand"
import "crypto/rsa"
import "crypto/sha1"
func Encrypt(key *rsa.PublicKey, m, l []byte) ([]byte, error) {
return rsa.EncryptOAEP(sha1.New(), rand.Reader, key, m, l)
}
go for the would-be network programmer http://slides.games-with-brains.net/175

176. package main
import "crypto/rand"
import "crypto/rsa"
import "crypto/sha1"
func Encrypt(key *rsa.PublicKey, m, l []byte) ([]byte, error) {
return rsa.EncryptOAEP(sha1.New(), rand.Reader, key, m, l)
}
go for the would-be network programmer http://slides.games-with-brains.net/176

177. package main
import "crypto/rand"
import "crypto/rsa"
import "crypto/sha1"
func Encrypt(key *rsa.PublicKey, m, l []byte) ([]byte, error) {
return rsa.EncryptOAEP(sha1.New(), rand.Reader, key, m, l)
}
go for the would-be network programmer http://slides.games-with-brains.net/177

178. rsa decrypt
178go for the would-be network programmer http://slides.games-with-brains.net/

179. package main
import "crypto/rsa"
import . "fmt"
import "net"
func main() {
Dial(":1025", "ckey", func(c *net.UDPConn, k *rsa.PrivateKey) {
if m, e := ReadStream(c); e == nil {
if m, e := Decrypt(k, m, []byte("served")); e == nil {
Println(string(m))
}
}
})
}
go for the would-be network programmer http://slides.games-with-brains.net/179

180. package main
import "crypto/rsa"
import . "fmt"
import "net"
func main() {
Dial(":1025", "ckey", func(c *net.UDPConn, k *rsa.PrivateKey) {
if m, e := ReadStream(c); e == nil {
if m, e := Decrypt(k, m, []byte("served")); e == nil {
Println(string(m))
}
}
})
}
go for the would-be network programmer http://slides.games-with-brains.net/180

181. package main
import "crypto/rsa"
import . "fmt"
import "net"
func main() {
Dial(":1025", "ckey", func(c *net.UDPConn, k *rsa.PrivateKey) {
if m, e := ReadStream(c); e == nil {
if m, e := Decrypt(k, m, []byte("served")); e == nil {
Println(string(m))
}
}
})
}
go for the would-be network programmer http://slides.games-with-brains.net/181

182. package main
import "crypto/rand"
import "crypto/rsa"
import "crypto/sha1"
func Decrypt(key *rsa.PrivateKey, m, l []byte) ([]byte, error) {
return rsa.DecryptOAEP(sha1.New(), rand.Reader, key, m, l)
}
go for the would-be network programmer http://slides.games-with-brains.net/182

183. package main
import "crypto/rsa"
import . "fmt"
import "net"
func main() {
Dial(":1025", "ckey", func(c *net.UDPConn, k *rsa.PrivateKey) {
if m, e := ReadStream(c); e == nil {
if m, e := Decrypt(k, m, []byte("served")); e == nil {
Println(string(m))
}
}
})
}
go for the would-be network programmer http://slides.games-with-brains.net/183

184. package main
import "crypto/rsa"
import . "fmt"
import "net"
func main() {
Dial(":1025", "ckey", func(c *net.UDPConn, k *rsa.PrivateKey) {
if m, e := ReadStream(c); e == nil {
if m, e := Decrypt(k, m, []byte("served")); e == nil {
Println(string(m))
}
}
})
}
go for the would-be network programmer http://slides.games-with-brains.net/184

185. package main
import "crypto/rsa"
import . "fmt"
import "net"
func Dial(a, file string, f func(*net.UDPConn, *rsa.PrivateKey)) {
if k, e := LoadPrivateKey(file); e == nil {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
SendKey(conn, k.PublicKey, func() {
f(conn, k)
})
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/185

186. package main
import "crypto/rsa"
import . "fmt"
import "net"
func Dial(a, file string, f func(*net.UDPConn, *rsa.PrivateKey)) {
if k, e := LoadPrivateKey(file); e == nil {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
SendKey(conn, k.PublicKey, func() {
f(conn, k)
})
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/186

187. package main
import "crypto/rsa"
import . "fmt"
import "net"
func Dial(a, file string, f func(*net.UDPConn, *rsa.PrivateKey)) {
if k, e := LoadPrivateKey(file); e == nil {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
SendKey(conn, k.PublicKey, func() {
f(conn, k)
})
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/187

188. package main
import "crypto/rsa"
import "crypto/x509"
import "encoding/pem"
import "io/ioutil"
func LoadPrivateKey(file string) (r *rsa.PrivateKey, e error) {
if file, e := ioutil.ReadFile(file); e == nil {
if block, _ := pem.Decode(file); block != nil {
if block.Type == "RSA PRIVATE KEY" {
r, e = x509.ParsePKCS1PrivateKey(block.Bytes)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/188

189. package main
import "crypto/rsa"
import "crypto/x509"
import "encoding/pem"
import "io/ioutil"
func LoadPrivateKey(file string) (r *rsa.PrivateKey, e error) {
if file, e := ioutil.ReadFile(file); e == nil {
if block, _ := pem.Decode(file); block != nil {
if block.Type == "RSA PRIVATE KEY" {
r, e = x509.ParsePKCS1PrivateKey(block.Bytes)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/189

190. package main
import "crypto/rsa"
import "crypto/x509"
import "encoding/pem"
import "io/ioutil"
func LoadPrivateKey(file string) (r *rsa.PrivateKey, e error) {
if file, e := ioutil.ReadFile(file); e == nil {
if block, _ := pem.Decode(file); block != nil {
if block.Type == "RSA PRIVATE KEY" {
r, e = x509.ParsePKCS1PrivateKey(block.Bytes)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/190

191. package main
import "crypto/rsa"
import "crypto/x509"
import "encoding/pem"
import "io/ioutil"
func LoadPrivateKey(file string) (r *rsa.PrivateKey, e error) {
if file, e := ioutil.ReadFile(file); e == nil {
if block, _ := pem.Decode(file); block != nil {
if block.Type == "RSA PRIVATE KEY" {
r, e = x509.ParsePKCS1PrivateKey(block.Bytes)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/191

192. package main
import "crypto/rsa"
import "crypto/x509"
import "encoding/pem"
import "io/ioutil"
func LoadPrivateKey(file string) (r *rsa.PrivateKey, e error) {
if file, e := ioutil.ReadFile(file); e == nil {
if block, _ := pem.Decode(file); block != nil {
if block.Type == "RSA PRIVATE KEY" {
r, e = x509.ParsePKCS1PrivateKey(block.Bytes)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/192

193. package main
import "crypto/rsa"
import "crypto/x509"
import "encoding/pem"
import "io/ioutil"
func LoadPrivateKey(file string) (r *rsa.PrivateKey, e error) {
if file, e := ioutil.ReadFile(file); e == nil {
if block, _ := pem.Decode(file); block != nil {
if block.Type == "RSA PRIVATE KEY" {
r, e = x509.ParsePKCS1PrivateKey(block.Bytes)
}
}
}
return
}
go for the would-be network programmer http://slides.games-with-brains.net/193

194. package main
import "crypto/rsa"
import . "fmt"
import "net"
func Dial(a, file string, f func(*net.UDPConn, *rsa.PrivateKey)) {
if k, e := LoadPrivateKey(file); e == nil {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
SendKey(conn, k.PublicKey, func() {
f(conn, k)
})
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/194

195. package main
import "crypto/rsa"
import . "fmt"
import "net"
func Dial(a, file string, f func(*net.UDPConn, *rsa.PrivateKey)) {
if k, e := LoadPrivateKey(file); e == nil {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
SendKey(conn, k.PublicKey, func() {
f(conn, k)
})
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/195

196. package main
import "crypto/rsa"
import . "fmt"
import "net"
func Dial(a, file string, f func(*net.UDPConn, *rsa.PrivateKey)) {
if k, e := LoadPrivateKey(file); e == nil {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
SendKey(conn, k.PublicKey, func() {
f(conn, k)
})
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/196

197. package main
import "bytes"
import “crypto/rsa"
import "encoding/gob"
import "net"
func SendKey(c *net.UDPConn, k rsa.PublicKey, f func()) {
var b bytes.Buffer
if e := gob.NewEncoder(&b).Encode(k); e == nil {
if _, e = c.Write(b.Bytes()); e == nil {
f()
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/197

198. package main
import "bytes"
import “crypto/rsa"
import "encoding/gob"
import "net"
func SendKey(c *net.UDPConn, k rsa.PublicKey, f func()) {
var b bytes.Buffer
if e := gob.NewEncoder(&b).Encode(k); e == nil {
if _, e = c.Write(b.Bytes()); e == nil {
f()
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/198

199. package main
import "bytes"
import “crypto/rsa"
import "encoding/gob"
import "net"
func SendKey(c *net.UDPConn, k rsa.PublicKey, f func()) {
var b bytes.Buffer
if e := gob.NewEncoder(&b).Encode(k); e == nil {
if _, e = c.Write(b.Bytes()); e == nil {
f()
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/199

200. package main
import "crypto/rsa"
import . "fmt"
import "net"
func Dial(a, file string, f func(*net.UDPConn, *rsa.PrivateKey)) {
if k, e := LoadPrivateKey(file); e == nil {
if address, e := net.ResolveUDPAddr("udp", a); e == nil {
if conn, e := net.DialUDP("udp", nil, address); e == nil {
defer conn.Close()
SendKey(conn, k.PublicKey, func() {
f(conn, k)
})
}
}
}
}
go for the would-be network programmer http://slides.games-with-brains.net/200

201. http://golang.org/
go for the would-be network programmer http://slides.games-with-brains.net/201

202. twitter://#golang
go for the would-be network programmer http://slides.games-with-brains.net/202