mirror of
https://github.com/SagerNet/sing-box.git
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84 lines
1.9 KiB
Go
84 lines
1.9 KiB
Go
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// Copyright (c) 2018, Open Systems AG. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the LICENSE file in the root of the source
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// tree.
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package ja3
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import (
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"crypto/md5"
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"encoding/hex"
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"golang.org/x/exp/slices"
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)
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type ClientHello struct {
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Version uint16
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CipherSuites []uint16
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Extensions []uint16
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EllipticCurves []uint16
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EllipticCurvePF []uint8
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Versions []uint16
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SignatureAlgorithms []uint16
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ServerName string
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ja3ByteString []byte
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ja3Hash string
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}
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func (j *ClientHello) Equals(another *ClientHello, ignoreExtensionsSequence bool) bool {
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if j.Version != another.Version {
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return false
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}
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if !slices.Equal(j.CipherSuites, another.CipherSuites) {
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return false
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}
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if !ignoreExtensionsSequence && !slices.Equal(j.Extensions, another.Extensions) {
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return false
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}
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if ignoreExtensionsSequence && !slices.Equal(j.Extensions, another.sortedExtensions()) {
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return false
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}
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if !slices.Equal(j.EllipticCurves, another.EllipticCurves) {
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return false
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}
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if !slices.Equal(j.EllipticCurvePF, another.EllipticCurvePF) {
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return false
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}
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if !slices.Equal(j.SignatureAlgorithms, another.SignatureAlgorithms) {
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return false
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}
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return true
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}
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func (j *ClientHello) sortedExtensions() []uint16 {
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extensions := make([]uint16, len(j.Extensions))
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copy(extensions, j.Extensions)
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slices.Sort(extensions)
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return extensions
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}
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func Compute(payload []byte) (*ClientHello, error) {
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ja3 := ClientHello{}
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err := ja3.parseSegment(payload)
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return &ja3, err
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}
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func (j *ClientHello) String() string {
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if j.ja3ByteString == nil {
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j.marshalJA3()
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}
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return string(j.ja3ByteString)
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}
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func (j *ClientHello) Hash() string {
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if j.ja3ByteString == nil {
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j.marshalJA3()
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}
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if j.ja3Hash == "" {
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h := md5.Sum(j.ja3ByteString)
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j.ja3Hash = hex.EncodeToString(h[:])
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}
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return j.ja3Hash
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}
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