Reintegrate certificate selection in HttpNetworkTransaction DoLoop

third_party/tlslite/tlslite/messages.py

 """Classes representing TLS messages."""
 
 from utils.compat import *
 from utils.cryptomath import *
 from errors import *
 from utils.codec import *
 from constants import *
 from X509 import X509
 from X509CertChain import X509CertChain
 
@@ skipping 328 matching lines @@
             else:
                 bytes = createByteArraySequence([])
             w.addVarSeq(bytes, 1, 2)
         else:
             raise AssertionError()
         return HandshakeMsg.postWrite(self, w, trial)
 
 class CertificateRequest(HandshakeMsg):
     def __init__(self):
         self.contentType = ContentType.handshake
-        self.certificate_types = []
+        #Apple's Secure Transport library rejects empty certificate_types, so
+        #default to rsa_sign.
+        self.certificate_types = [ClientCertificateType.rsa_sign]
         self.certificate_authorities = []
 
     def create(self, certificate_types, certificate_authorities):
         self.certificate_types = certificate_types
         self.certificate_authorities = certificate_authorities
         return self
 
     def parse(self, p):
         p.startLengthCheck(3)
         self.certificate_types = p.getVarList(1, 1)
@@ skipping 212 matching lines @@
 
     def create(self, bytes):
         self.bytes = bytes
         return self
 
     def parse(self, p):
         self.bytes = p.bytes
         return self
 
     def write(self):
-        return self.bytes
+        return self.bytes