Replace NTLMv1 implementation with a functionally equivalent one.

net/ntlm/ntlm_constants.h

Index: net/ntlm/ntlm_constants.h
diff --git a/net/ntlm/ntlm_constants.h b/net/ntlm/ntlm_constants.h
index 53f69a64bd309a9165b3796dcfb2f8eeb38f4171..175deb1ba015434897e1eb2d7ecfd6d6538a4d3a 100644
--- a/net/ntlm/ntlm_constants.h
+++ b/net/ntlm/ntlm_constants.h
@@ -38,7 +38,7 @@ enum class NtlmVersion {
 };
 
 // There are 3 types of messages in NTLM. The message type is a field in
-// every NTLM message header.
+// every NTLM message header. See [MS-NLMP] Section 2.2.
 enum class MessageType : uint32_t {
   kNegotiate = 0x01,
   kChallenge = 0x02,
@@ -78,10 +78,12 @@ static constexpr size_t kSignatureLen = arraysize(kSignature);
 static constexpr size_t kSecurityBufferLen =
     (2 * sizeof(uint16_t)) + sizeof(uint32_t);
 static constexpr size_t kNegotiateMessageLen = 32;
+static constexpr size_t kMinChallengeHeaderLen = 32;
 static constexpr size_t kChallengeHeaderLen = 32;
 static constexpr size_t kResponseLenV1 = 24;
 static constexpr size_t kChallengeLen = 8;
 static constexpr size_t kNtlmHashLen = 16;
+static constexpr size_t kAuthenticateHeaderLenV1 = 64;
 
 static constexpr NegotiateFlags kNegotiateMessageFlags =
     NegotiateFlags::kUnicode | NegotiateFlags::kOem |