File: stream_test.go

package info (click to toggle)
golang-github-awnumar-memguard 0.22.5-2
  • links: PTS, VCS
  • area: main
  • in suites: sid, trixie
  • size: 572 kB
  • sloc: makefile: 3
file content (247 lines) | stat: -rw-r--r-- 4,777 bytes parent folder | download
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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
package memguard

import (
	"bytes"
	"io"
	"os"
	"runtime"
	"testing"

	"github.com/awnumar/memguard/core"
)

func write(t *testing.T, s *Stream, b []byte) {
	n, err := s.Write(b)
	if err != nil {
		t.Error("write should always succeed", err)
	}
	if n != len(b) {
		t.Error("not all data was written")
	}
	if !bytes.Equal(b, make([]byte, len(b))) {
		t.Error("buffer not wiped")
	}
}

func read(t *testing.T, s *Stream, ref []byte, expectedErr error) {
	b := make([]byte, len(ref))
	n, err := s.Read(b)
	if err != expectedErr {
		t.Error("Expected", expectedErr, "got;", err)
	}
	if n != len(b) {
		t.Error("not enough data read")
	}
	if !bytes.Equal(ref, b) {
		t.Error("data mismatch")
	}
}

func TestStreamNextFlush(t *testing.T) {
	s := NewStream()

	size := 2*StreamChunkSize + 1024
	b := make([]byte, size)
	ScrambleBytes(b)
	ref := make([]byte, len(b))
	copy(ref, b)
	write(t, s, b)

	c, err := s.Next()
	if err != nil {
		t.Error(err)
	}
	if c.Size() != StreamChunkSize {
		t.Error(c.Size())
	}
	if !c.EqualTo(ref[:StreamChunkSize]) {
		t.Error("incorrect data")
	}
	c.Destroy()

	c, err = s.Flush()
	if err != nil {
		t.Error(err)
	}
	if c.Size() != size-StreamChunkSize {
		t.Error("unexpected length:", c.Size())
	}
	if !c.EqualTo(ref[StreamChunkSize:]) {
		t.Error("incorrect data")
	}
	c.Destroy()
}

func TestStreamReadWrite(t *testing.T) {
	// Create new stream object.
	s := NewStream()

	// Initialise some data to store.
	b := make([]byte, 1024)
	ScrambleBytes(b)
	ref := make([]byte, len(b))
	copy(ref, b)

	// Write the data to the stream.
	write(t, s, b)

	// Read the data back.
	read(t, s, ref, nil)

	// Check for end of data error
	read(t, s, nil, io.EOF)

	// Write more than the pagesize to the stream
	b = make([]byte, os.Getpagesize()*4+16)
	ScrambleBytes(b)
	copy(b[os.Getpagesize()*4:], []byte("yellow submarine"))
	ref = make([]byte, len(b))
	copy(ref, b)
	write(t, s, b)

	// Read back four pages
	for i := 0; i < 4; i++ {
		read(t, s, ref[i*os.Getpagesize():(i+1)*os.Getpagesize()], nil)
	}

	// Read back the remaining data
	read(t, s, []byte("yellow submarine"), nil)

	// Should be no data left
	read(t, s, nil, io.EOF)

	// Test reading less data than is in the chunk
	data := make([]byte, 16)
	ScrambleBytes(data)
	ref = make([]byte, len(data))
	copy(ref, data)
	write(t, s, data)
	write(t, s, data) // have two enclaves in the stream, 32 bytes total
	read(t, s, ref[:4], nil)
	read(t, s, ref[4:8], nil)
	read(t, s, ref[8:], nil)
	read(t, s, make([]byte, 16), nil)
	read(t, s, nil, io.EOF)

	// Test reading after purging the session
	ScrambleBytes(data)
	write(t, s, data)
	Purge()
	read(t, s, nil, core.ErrDecryptionFailed)
}

func TestStreamingSanity(t *testing.T) {
	s := NewStream()

	// write 2 pages + 1024 bytes to the stream
	size := 2*os.Getpagesize() + 1024
	b := make([]byte, size)
	ScrambleBytes(b)
	ref := make([]byte, len(b))
	copy(ref, b)
	write(t, s, b)

	// read it back exactly
	c, err := NewBufferFromReader(s, size)
	if err != nil {
		t.Error(err)
	}
	if c.Size() != size {
		t.Error("not enough data read back")
	}
	if !c.EqualTo(ref) {
		t.Error("data mismatch")
	}
	c.Destroy()

	// should be no data left
	read(t, s, nil, io.EOF)

	// write the data back to the stream
	copy(b, ref)
	write(t, s, b)

	// read it all back
	c, err = NewBufferFromEntireReader(s)
	if err != nil {
		t.Error(err)
	}
	if c.Size() != size {
		t.Error("not enough data read back")
	}
	if !c.EqualTo(ref) {
		t.Error("data mismatch")
	}
	c.Destroy()

	// should be no data left
	read(t, s, nil, io.EOF)

	// write a page + 1024 bytes
	size = os.Getpagesize() + 1024
	b = make([]byte, size)
	b[size-1] = 'x'
	write(t, s, b)

	// read it back until the delimiter
	c, err = NewBufferFromReaderUntil(s, 'x')
	if err != nil {
		t.Error(err)
	}
	if c.Size() != size-1 {
		t.Error("not enough data read back:", c.Size(), "want", size-1)
	}
	if !c.EqualTo(make([]byte, size-1)) {
		t.Error("data mismatch")
	}
	c.Destroy()

	// should be no data left
	read(t, s, nil, io.EOF)
}

func TestStreamSize(t *testing.T) {
	s := NewStream()

	if s.Size() != 0 {
		t.Error("size is", s.Size())
	}

	size := 1024 * 32
	b := make([]byte, size)
	write(t, s, b)

	if s.Size() != size {
		t.Error("size should be", size, "instead is", s.Size())
	}
}

func BenchmarkStreamWrite(b *testing.B) {
	b.ReportAllocs()
	b.SetBytes(int64(StreamChunkSize))

	s := NewStream()
	buf := make([]byte, StreamChunkSize)
	for i := 0; i < b.N; i++ {
		s.Write(buf)
	}
	runtime.KeepAlive(s)
}

func BenchmarkStreamRead(b *testing.B) {
	s := NewStream()
	buf := make([]byte, StreamChunkSize)
	for i := 0; i < b.N; i++ {
		s.Write(buf)
	}

	b.ReportAllocs()
	b.SetBytes(int64(StreamChunkSize))
	b.ResetTimer()

	for i := 0; i < b.N; i++ {
		s.Read(buf)
	}

	runtime.KeepAlive(s)
}