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 cdfb71a80218690b5c4e3e8503f4d7e8ecb676bf..f3cce23905e8f3ec61cf874a7aab0fc05b904313 100644
--- a/net/ntlm/ntlm_constants.h
+++ b/net/ntlm/ntlm_constants.h
@@ -35,7 +35,7 @@ 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 {
   NEGOTIATE = 0x01,
   CHALLENGE = 0x02,
@@ -75,10 +75,12 @@ static constexpr size_t SIGNATURE_LEN = arraysize(SIGNATURE);
 static constexpr size_t SECURITY_BUFFER_LEN =
     (2 * sizeof(uint16_t)) + sizeof(uint32_t);
 static constexpr size_t NEGOTIATE_MESSAGE_LEN = 32;
+static constexpr size_t MIN_CHALLENGE_HEADER_LEN = 32;
 static constexpr size_t CHALLENGE_HEADER_LEN = 32;
 static constexpr size_t RESPONSE_V1_LEN = 24;
 static constexpr size_t CHALLENGE_LEN = 8;
 static constexpr size_t NTLM_HASH_LEN = 16;
+static constexpr size_t AUTHENTICATE_HEADER_V1_LEN = 64;
 
 static constexpr NegotiateFlags NEGOTIATE_MESSAGE_FLAGS =
     NegotiateFlags::UNICODE | NegotiateFlags::OEM |