File size: 4,529 Bytes
4bcc2be | 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 | // Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package subtle_test
import (
"bytes"
"crypto/rand"
. "crypto/subtle"
"fmt"
"testing"
)
func TestXORBytes(t *testing.T) {
for n := 1; n <= 1024; n++ {
if n > 16 && testing.Short() {
n += n >> 3
}
for alignP := 0; alignP < 8; alignP++ {
for alignQ := 0; alignQ < 8; alignQ++ {
for alignD := 0; alignD < 8; alignD++ {
p := make([]byte, alignP+n, alignP+n+100)[alignP:]
q := make([]byte, alignQ+n, alignQ+n+100)[alignQ:]
if n&1 != 0 {
p = p[:n]
} else {
q = q[:n]
}
rand.Read(p)
rand.Read(q)
d := make([]byte, alignD+n+100)
rand.Read(d)
want := bytes.Clone(d)
for i := range n {
want[alignD+i] = p[i] ^ q[i]
}
if nn := XORBytes(d[alignD:], p, q); !bytes.Equal(d, want) {
t.Errorf("n=%d alignP=%d alignQ=%d alignD=%d:\n\tp = %x\n\tq = %x\n\td = %x\n\twant %x\n", n, alignP, alignQ, alignD, p, q, d, want)
} else if nn != n {
t.Errorf("n=%d alignP=%d alignQ=%d alignD=%d: got %d, want %d", n, alignP, alignQ, alignD, nn, n)
}
p1 := bytes.Clone(p)
if nn := XORBytes(p, p, q); !bytes.Equal(p, want[alignD:alignD+n]) {
t.Errorf("n=%d alignP=%d alignQ=%d alignD=%d:\n\tp = %x\n\tq = %x\n\td = %x\n\twant %x\n", n, alignP, alignQ, alignD, p, q, d, want)
} else if nn != n {
t.Errorf("n=%d alignP=%d alignQ=%d alignD=%d: got %d, want %d", n, alignP, alignQ, alignD, nn, n)
}
if nn := XORBytes(q, p1, q); !bytes.Equal(q, want[alignD:alignD+n]) {
t.Errorf("n=%d alignP=%d alignQ=%d alignD=%d:\n\tp = %x\n\tq = %x\n\td = %x\n\twant %x\n", n, alignP, alignQ, alignD, p, q, d, want)
} else if nn != n {
t.Errorf("n=%d alignP=%d alignQ=%d alignD=%d: got %d, want %d", n, alignP, alignQ, alignD, nn, n)
}
if nn := XORBytes(p, p, p); !bytes.Equal(p, make([]byte, n)) {
t.Errorf("n=%d alignP=%d alignQ=%d alignD=%d: got %x, want %x", n, alignP, alignQ, alignD, p, make([]byte, n))
} else if nn != n {
t.Errorf("n=%d alignP=%d alignQ=%d alignD=%d: got %d, want %d", n, alignP, alignQ, alignD, nn, n)
}
if nn := XORBytes(p1, q, q); !bytes.Equal(p1, make([]byte, n)) {
t.Errorf("n=%d alignP=%d alignQ=%d alignD=%d: got %x, want %x", n, alignP, alignQ, alignD, p1, make([]byte, n))
} else if nn != n {
t.Errorf("n=%d alignP=%d alignQ=%d alignD=%d: got %d, want %d", n, alignP, alignQ, alignD, nn, n)
}
}
}
}
}
}
func TestXorBytesPanic(t *testing.T) {
mustPanic(t, "subtle.XORBytes: dst too short", func() {
XORBytes(nil, make([]byte, 1), make([]byte, 1))
})
mustPanic(t, "subtle.XORBytes: dst too short", func() {
XORBytes(make([]byte, 1), make([]byte, 2), make([]byte, 3))
})
mustPanic(t, "subtle.XORBytes: invalid overlap", func() {
x := make([]byte, 3)
XORBytes(x, x[1:], make([]byte, 2))
})
mustPanic(t, "subtle.XORBytes: invalid overlap", func() {
x := make([]byte, 3)
XORBytes(x, make([]byte, 2), x[1:])
})
}
func BenchmarkXORBytes(b *testing.B) {
dst := make([]byte, 1<<15)
data0 := make([]byte, 1<<15)
data1 := make([]byte, 1<<15)
sizes := []int64{1 << 3, 1 << 7, 1 << 11, 1 << 13, 1 << 15}
for _, size := range sizes {
b.Run(fmt.Sprintf("%dBytes", size), func(b *testing.B) {
s0 := data0[:size]
s1 := data1[:size]
b.SetBytes(int64(size))
for i := 0; i < b.N; i++ {
XORBytes(dst, s0, s1)
}
})
}
}
func BenchmarkXORBytesAlignment(b *testing.B) {
dst := make([]byte, 8+1<<11)
data0 := make([]byte, 8+1<<11)
data1 := make([]byte, 8+1<<11)
sizes := []int64{1 << 3, 1 << 7, 1 << 11}
for _, size := range sizes {
for offset := int64(0); offset < 8; offset++ {
b.Run(fmt.Sprintf("%dBytes%dOffset", size, offset), func(b *testing.B) {
d := dst[offset : offset+size]
s0 := data0[offset : offset+size]
s1 := data1[offset : offset+size]
b.SetBytes(int64(size))
for i := 0; i < b.N; i++ {
XORBytes(d, s0, s1)
}
})
}
}
}
func mustPanic(t *testing.T, expected string, f func()) {
t.Helper()
defer func() {
t.Helper()
switch msg := recover().(type) {
case nil:
t.Errorf("expected panic(%q), but did not panic", expected)
case string:
if msg != expected {
t.Errorf("expected panic(%q), but got panic(%q)", expected, msg)
}
default:
t.Errorf("expected panic(%q), but got panic(%T%v)", expected, msg, msg)
}
}()
f()
}
|