74 lines
1.4 KiB
Go
74 lines
1.4 KiB
Go
package websocket
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import (
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"bytes"
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"crypto/rand"
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"encoding/binary"
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"math/big"
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"math/bits"
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"testing"
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"github.com/coder/websocket/internal/test/assert"
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)
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func basicMask(b []byte, key uint32) uint32 {
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for i := range b {
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b[i] ^= byte(key)
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key = bits.RotateLeft32(key, -8)
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}
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return key
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}
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func basicMask2(b []byte, key uint32) uint32 {
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keyb := binary.LittleEndian.AppendUint32(nil, key)
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pos := 0
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for i := range b {
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b[i] ^= keyb[pos&3]
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pos++
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}
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return bits.RotateLeft32(key, (pos&3)*-8)
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}
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func TestMask(t *testing.T) {
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t.Parallel()
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testMask(t, "basicMask", basicMask)
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testMask(t, "maskGo", maskGo)
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testMask(t, "basicMask2", basicMask2)
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}
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func testMask(t *testing.T, name string, fn func(b []byte, key uint32) uint32) {
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t.Run(name, func(t *testing.T) {
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t.Parallel()
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for i := 0; i < 9999; i++ {
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keyb := make([]byte, 4)
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_, err := rand.Read(keyb)
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assert.Success(t, err)
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key := binary.LittleEndian.Uint32(keyb)
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n, err := rand.Int(rand.Reader, big.NewInt(1<<16))
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assert.Success(t, err)
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b := make([]byte, 1+n.Int64())
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_, err = rand.Read(b)
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assert.Success(t, err)
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b2 := make([]byte, len(b))
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copy(b2, b)
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b3 := make([]byte, len(b))
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copy(b3, b)
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key2 := basicMask(b2, key)
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key3 := fn(b3, key)
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if key2 != key3 {
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t.Errorf("expected key %X but got %X", key2, key3)
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}
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if !bytes.Equal(b2, b3) {
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t.Error("bad bytes")
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return
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}
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}
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})
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}
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