Function extractRawExtensions

ech.go:260–284

(hello *clientHelloMsg)

}

func extractRawExtensions(hello *clientHelloMsg) ([]rawExtension, error) {
	s := cryptobyte.String(hello.original)
	if !s.Skip(4+2+32) || // header, version, random
		!skipUint8LengthPrefixed(&s) || // session ID
		!skipUint16LengthPrefixed(&s) || // cipher suites
		!skipUint8LengthPrefixed(&s) { // compression methods
		return nil, errors.New("tls: malformed outer client hello")
	}
	var rawExtensions []rawExtension
	var extensions cryptobyte.String
	if !s.ReadUint16LengthPrefixed(&extensions) {
		return nil, errors.New("tls: malformed outer client hello")
	}

	for !extensions.Empty() {
		var extension uint16
		var extData cryptobyte.String
		if !extensions.ReadUint16(&extension) ||
			!extensions.ReadUint16LengthPrefixed(&extData) {
			return nil, errors.New("tls: invalid inner client hello")
		}
		rawExtensions = append(rawExtensions, rawExtension{extension, extData})
	}
	return rawExtensions, nil
}

func decodeInnerClientHello(outer *clientHelloMsg, encoded []byte) (*clientHelloMsg, error) {
	// Reconstructing the inner client hello from its encoded form is somewhat