mirror of
https://github.com/cbeuw/Cloak.git
synced 2024-10-23 15:46:25 +00:00
50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
package client
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import (
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"encoding/binary"
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"github.com/cbeuw/Cloak/internal/util"
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)
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type Browser interface {
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composeClientHello(*State) ([]byte, []byte)
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}
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func makeServerName(serverName string) []byte {
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serverNameListLength := make([]byte, 2)
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binary.BigEndian.PutUint16(serverNameListLength, uint16(len(serverName)+3))
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serverNameType := []byte{0x00} // host_name
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serverNameLength := make([]byte, 2)
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binary.BigEndian.PutUint16(serverNameLength, uint16(len(serverName)))
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ret := make([]byte, 2+1+2+len(serverName))
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copy(ret[0:2], serverNameListLength)
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copy(ret[2:3], serverNameType)
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copy(ret[3:5], serverNameLength)
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copy(ret[5:], serverName)
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return ret
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}
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func makeNullBytes(length int) []byte {
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ret := make([]byte, length)
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for i := 0; i < length; i++ {
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ret[i] = 0x00
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}
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return ret
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}
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// addExtensionRecord, add type, length to extension data
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func addExtRec(typ []byte, data []byte) []byte {
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length := make([]byte, 2)
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binary.BigEndian.PutUint16(length, uint16(len(data)))
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ret := make([]byte, 2+2+len(data))
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copy(ret[0:2], typ)
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copy(ret[2:4], length)
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copy(ret[4:], data)
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return ret
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}
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// ComposeClientHello composes ClientHello with record layer
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func ComposeClientHello(sta *State) ([]byte, []byte) {
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ch, sharedSecret := sta.Browser.composeClientHello(sta)
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return util.AddRecordLayer(ch, []byte{0x16}, []byte{0x03, 0x01}), sharedSecret
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}
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