noise/example_test.go at master · tetsuo/noise · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
package noise_test

import (
	"fmt"
	"log"

	"github.com/tetsuo/noise"
)

// Example demonstrates a basic XX handshake pattern.
func Example() {
	// Create initiator and responder
	initiator, err := noise.NewNoiseState(
		noise.PatternXX,
		true,
		&noise.Config{},
	)
	if err != nil {
		log.Fatal(err)
	}

	responder, err := noise.NewNoiseState(
		noise.PatternXX,
		false,
		&noise.Config{},
	)
	if err != nil {
		log.Fatal(err)
	}

	// Initialize with prologue
	prologue := []byte("MyProtocol v1.0")
	initiator.Initialize(prologue, nil)
	responder.Initialize(prologue, nil)

	// Perform handshake
	// Message 1: initiator -> responder
	msg1, _ := initiator.Send([]byte("Hello"))
	payload1, _ := responder.Recv(msg1)
	fmt.Printf("Responder received: %s\n", payload1)

	// Message 2: responder -> initiator
	msg2, _ := responder.Send([]byte("World"))
	payload2, _ := initiator.Recv(msg2)
	fmt.Printf("Initiator received: %s\n", payload2)

	// Message 3: initiator -> responder (finalizes)
	msg3, _ := initiator.Send(nil)
	responder.Recv(msg3)

	// Handshake complete
	if initiator.IsComplete() && responder.IsComplete() {
		fmt.Println("Handshake complete!")

		// Use transport keys for encrypted communication
		plaintext := []byte("Secret")
		ciphertext, _ := initiator.Tx().Encrypt(nil, plaintext, nil)
		decrypted, _ := responder.Rx().Decrypt(nil, ciphertext, nil)
		fmt.Printf("Transport message: %s\n", decrypted)
	}

	// Output:
	// Responder received: Hello
	// Initiator received: World
	// Handshake complete!
	// Transport message: Secret
}

// ExamplePSK demonstrates PSK handshake.
func Example_psk() {
	psk := []byte("my-32-byte-pre-shared-key-here!!")

	initiator, _ := noise.NewNoiseState(
		noise.PatternXXpsk0,
		true,
		&noise.Config{PSK: psk},
	)

	responder, _ := noise.NewNoiseState(
		noise.PatternXXpsk0,
		false,
		&noise.Config{PSK: psk},
	)

	prologue := []byte("PSK Demo")
	initiator.Initialize(prologue, nil)
	responder.Initialize(prologue, nil)

	// Complete handshake
	msg1, _ := initiator.Send(nil)
	responder.Recv(msg1)
	msg2, _ := responder.Send(nil)
	initiator.Recv(msg2)
	msg3, _ := initiator.Send(nil)
	responder.Recv(msg3)

	fmt.Printf("PSK handshake complete: %v\n", initiator.IsComplete())

	// Output:
	// PSK handshake complete: true
}

// Example_ik demonstrates IK pattern with pre-known responder key.
func Example_ik() {
	// Responder has a known static key
	responder, _ := noise.NewNoiseState(
		noise.PatternIK,
		false,
		&noise.Config{},
	)
	responderPublicKey := responder.StaticPublicKey()

	// Initiator knows responder's key in advance
	initiator, _ := noise.NewNoiseState(
		noise.PatternIK,
		true,
		&noise.Config{},
	)

	prologue := []byte("IK Demo")
	initiator.Initialize(prologue, responderPublicKey)
	responder.Initialize(prologue, nil)

	// Complete 2-message handshake
	msg1, _ := initiator.Send(nil)
	responder.Recv(msg1)
	msg2, _ := responder.Send(nil)
	initiator.Recv(msg2)

	fmt.Printf("IK handshake complete: %v\n", initiator.IsComplete())

	// Output:
	// IK handshake complete: true
}

// Example_customKeys demonstrates using custom static keypairs.
func Example_customKeys() {
	curve := noise.DefaultCurve

	// Generate static keypairs
	initiatorStatic, _ := curve.GenerateKeyPair(nil)
	responderStatic, _ := curve.GenerateKeyPair(nil)

	// Create states with custom keys
	initiator, _ := noise.NewNoiseState(
		noise.PatternXX,
		true,
		&noise.Config{StaticKeypair: initiatorStatic},
	)

	responder, _ := noise.NewNoiseState(
		noise.PatternXX,
		false,
		&noise.Config{StaticKeypair: responderStatic},
	)

	prologue := []byte{}
	initiator.Initialize(prologue, nil)
	responder.Initialize(prologue, nil)

	// Complete handshake
	msg1, _ := initiator.Send(nil)
	responder.Recv(msg1)
	msg2, _ := responder.Send(nil)
	initiator.Recv(msg2)
	msg3, _ := initiator.Send(nil)
	responder.Recv(msg3)

	fmt.Printf("Custom keys handshake: %v\n", initiator.IsComplete())

	// Output:
	// Custom keys handshake: true
}