Update third_party/tlslite to 0.4.8.

third_party/tlslite/patches/certificate_request.patch

+diff --git a/third_party/tlslite/tlslite/messages.py b/third_party/tlslite/tlslite/messages.py
+index e1be195..65170de 100644
+--- a/third_party/tlslite/tlslite/messages.py
++++ b/third_party/tlslite/tlslite/messages.py
+@@ -460,7 +460,8 @@ class CertificateRequest(HandshakeMsg):
+         self.version = version
+         self.supported_signature_algs = []
+ 
+-    def create(self, certificate_types, certificate_authorities, sig_algs=()):
++    def create(self, certificate_types, certificate_authorities,
++               sig_algs=((HashAlgorithm.sha256, SignatureAlgorithm.rsa),)):
+         self.certificate_types = certificate_types
+         self.certificate_authorities = certificate_authorities
+         self.supported_signature_algs = sig_algs
+@@ -470,7 +471,8 @@ class CertificateRequest(HandshakeMsg):
+         p.startLengthCheck(3)
+         self.certificate_types = p.getVarList(1, 1)
+         if self.version >= (3,3):
+-            self.supported_signature_algs = p.getVarList(2, 2)
++            self.supported_signature_algs = \
++                [(b >> 8, b & 0xff) for b in p.getVarList(2, 2)]
+         ca_list_length = p.get(2)
+         index = 0
+         self.certificate_authorities = []
+@@ -485,7 +487,10 @@ class CertificateRequest(HandshakeMsg):
+         w = Writer()
+         w.addVarSeq(self.certificate_types, 1, 1)
+         if self.version >= (3,3):
+-            w.addVarSeq(self.supported_signature_algs, 2, 2)
++            w.add(2 * len(self.supported_signature_algs), 2)
++            for (hash, signature) in self.supported_signature_algs:
++                w.add(hash, 1)
++                w.add(signature, 1)
+         caLength = 0
+         #determine length
+         for ca_dn in self.certificate_authorities:
+@@ -647,6 +652,7 @@ class ClientKeyExchange(HandshakeMsg):
+ 
+ class CertificateVerify(HandshakeMsg):
+     def __init__(self):
++        # TODO: This does not handle the SignatureAlgorithm in TLS 1.2.
+         HandshakeMsg.__init__(self, HandshakeType.certificate_verify)
+         self.signature = bytearray(0)
+ 
+diff --git a/third_party/tlslite/tlslite/tlsconnection.py b/third_party/tlslite/tlslite/tlsconnection.py
+index cb743fe..65f8d67 100644
+--- a/third_party/tlslite/tlslite/tlsconnection.py
++++ b/third_party/tlslite/tlslite/tlsconnection.py
+@@ -966,6 +966,7 @@ class TLSConnection(TLSRecordLayer):
+                 verifyBytes = self._handshake_md5.digest() + \
+                                 self._handshake_sha.digest()
+             elif self.version == (3,3):
++                # TODO: This does not handle the PKCS#1 prefix in TLS 1.2.
+                 verifyBytes = self._handshake_sha256.digest()
+             if self.fault == Fault.badVerifyMessage:
+                 verifyBytes[0] = ((verifyBytes[0]+1) % 256)