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42 lines
1.2 KiB
Go
42 lines
1.2 KiB
Go
package browsers
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import "encoding/binary"
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type ClientHelloFields struct {
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Random []byte
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SessionId []byte
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X25519KeyShare []byte
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ServerName string
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}
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// Browser represents the signature of a browser at a particular version
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type Browser interface {
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// ComposeClientHello produces the ClientHello message (without TLS record layer) as the mimicking browser would
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ComposeClientHello(ClientHelloFields) []byte
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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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func generateSNI(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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