Update Token Binding code to the latest drafts

third_party/tlslite/patches/renegotiation_indication.patch

+diff --git a/third_party/tlslite/tlslite/constants.py b/third_party/tlslite/tlslite/constants.py
+index e9743e4..82e8c07 100644
+--- a/third_party/tlslite/tlslite/constants.py
++++ b/third_party/tlslite/tlslite/constants.py
+@@ -61,6 +61,7 @@ class ExtensionType:    # RFC 6066 / 4366
+     tack = 0xF300
+     supports_npn = 13172
+     channel_id = 30032
++    renegotiation_info = 0xFF01 # RFC 5746
+ 
+ class HashAlgorithm:
+     none = 0
+diff --git a/third_party/tlslite/tlslite/messages.py b/third_party/tlslite/tlslite/messages.py
+index 1ce9320..ac7e563 100644
+--- a/third_party/tlslite/tlslite/messages.py
++++ b/third_party/tlslite/tlslite/messages.py
+@@ -140,6 +140,7 @@ class ClientHello(HandshakeMsg):
+         self.tb_client_params = []
+         self.support_signed_cert_timestamps = False
+         self.status_request = False
++        self.ri = False
+ 
+     def create(self, version, random, session_id, cipher_suites,
+                certificate_types=None, srpUsername=None,
+@@ -244,12 +245,20 @@ class ClientHello(HandshakeMsg):
+                         # request_extensions in the OCSP request.
+                         p.getFixBytes(extLength)
+                         self.status_request = True
++                    elif extType == ExtensionType.renegotiation_info:
++                        # We don't support renegotiation, so if we receive this
++                        # extension, it should contain a single null byte.
++                        if extLength != 1 or p.getFixBytes(extLength)[0] != 0:
++                            raise SyntaxError()
++                        self.ri = True
+                     else:
+                         _ = p.getFixBytes(extLength)
+                     index2 = p.index
+                     if index2 - index1 != extLength:
+                         raise SyntaxError("Bad length for extension_data")
+                     soFar += 4 + extLength
++            if CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV in self.cipher_suites:
++                self.ri = True
+             p.stopLengthCheck()
+         return self
+ 
+@@ -327,6 +336,7 @@ class ServerHello(HandshakeMsg):
+         self.tb_params = None
+         self.signed_cert_timestamps = None
+         self.status_request = False
++        self.send_ri = False
+ 
+     def create(self, version, random, session_id, cipher_suite,
+                certificate_type, tackExt, alpn_proto_selected,
+@@ -432,6 +442,10 @@ class ServerHello(HandshakeMsg):
+         if self.status_request:
+             w2.add(ExtensionType.status_request, 2)
+             w2.add(0, 2)
++        if self.send_ri:
++            w2.add(ExtensionType.renegotiation_info, 2)
++            w2.add(1, 2)
++            w2.add(0, 1)
+         if len(w2.bytes):
+             w.add(len(w2.bytes), 2)
+             w.bytes += w2.bytes        
+diff --git a/third_party/tlslite/tlslite/tlsconnection.py b/third_party/tlslite/tlslite/tlsconnection.py
+index de5d580..8ba1c6e 100644
+--- a/third_party/tlslite/tlslite/tlsconnection.py
++++ b/third_party/tlslite/tlslite/tlsconnection.py
+@@ -1370,6 +1370,8 @@ class TLSConnection(TLSRecordLayer):
+             serverHello.signed_cert_timestamps = signedCertTimestamps
+         if clientHello.status_request:
+             serverHello.status_request = ocspResponse
++        if clientHello.ri:
++            serverHello.send_ri = True
+ 
+         # Perform the SRP key exchange
+         clientCertChain = None
+@@ -1583,6 +1585,8 @@ class TLSConnection(TLSRecordLayer):
+                     if param in settings.supportedTokenBindingParams:
+                           serverHello.tb_params = param
+                           break
++                if clientHello.ri:
++                    serverHello.send_ri = True
+                 for result in self._sendMsg(serverHello):
+                     yield result
+