fix(nix): update vendorHash and vendor dir for new deps

vendor/github.com/refraction-networking/utls/u_fingerprinter.go

@@ -0,0 +1,74 @@
+// Copyright 2017 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package tls
+
+// Fingerprinter is a struct largely for holding options for the FingerprintClientHello func
+type Fingerprinter struct {
+	// AllowBluntMimicry will ensure that unknown extensions are
+	// passed along into the resulting ClientHelloSpec as-is
+	// WARNING: there could be numerous subtle issues with ClientHelloSpecs
+	// that are generated with this flag which could compromise security and/or mimicry
+	AllowBluntMimicry bool
+	// AlwaysAddPadding will always add a UtlsPaddingExtension with BoringPaddingStyle
+	// at the end of the extensions list if it isn't found in the fingerprinted hello.
+	// This could be useful in scenarios where the hello you are fingerprinting does not
+	// have any padding, but you suspect that other changes you make to the final hello
+	// (including things like different SNI lengths) would cause padding to be necessary
+	AlwaysAddPadding bool
+
+	RealPSKResumption bool // if set, PSK extension (if any) will be real PSK extension, otherwise it will be fake PSK extension
+}
+
+// FingerprintClientHello returns a ClientHelloSpec which is based on the
+// ClientHello that is passed in as the data argument
+//
+// If the ClientHello passed in has extensions that are not recognized or cannot be handled
+// it will return a non-nil error and a nil *ClientHelloSpec value
+//
+// The data should be the full tls record, including the record type/version/length header
+// as well as the handshake type/length/version header
+// https://tools.ietf.org/html/rfc5246#section-6.2
+// https://tools.ietf.org/html/rfc5246#section-7.4
+//
+// It calls UnmarshalClientHello internally, and is kept for backwards compatibility
+func (f *Fingerprinter) FingerprintClientHello(data []byte) (clientHelloSpec *ClientHelloSpec, err error) {
+	return f.RawClientHello(data)
+}
+
+// RawClientHello returns a ClientHelloSpec which is based on the
+// ClientHello raw bytes that is passed in as the raw argument.
+//
+// It was renamed from FingerprintClientHello in v1.3.1 and earlier versions
+// as a more precise name for the function
+func (f *Fingerprinter) RawClientHello(raw []byte) (clientHelloSpec *ClientHelloSpec, err error) {
+	clientHelloSpec = &ClientHelloSpec{}
+
+	err = clientHelloSpec.FromRaw(raw, f.AllowBluntMimicry, f.RealPSKResumption)
+	if err != nil {
+		return nil, err
+	}
+
+	if f.AlwaysAddPadding {
+		clientHelloSpec.AlwaysAddPadding()
+	}
+
+	return clientHelloSpec, nil
+}
+
+// UnmarshalJSONClientHello returns a ClientHelloSpec which is based on the
+// ClientHello JSON bytes that is passed in as the json argument.
+func (f *Fingerprinter) UnmarshalJSONClientHello(json []byte) (clientHelloSpec *ClientHelloSpec, err error) {
+	clientHelloSpec = &ClientHelloSpec{}
+	err = clientHelloSpec.UnmarshalJSON(json)
+	if err != nil {
+		return nil, err
+	}
+
+	if f.AlwaysAddPadding {
+		clientHelloSpec.AlwaysAddPadding()
+	}
+
+	return clientHelloSpec, nil
+}