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 8dc6bb3cde8360696f65e6f10f55ad54a7862c0e..eabc0ee4ec3fbbf041c52682cbb30e65776aa1af 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 {
   kNegotiate = 0x01,
   kChallenge = 0x02,
@@ -75,10 +75,12 @@ 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 |