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diff --git a/security/ct/CTPolicyEnforcer.h b/security/ct/CTPolicyEnforcer.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef CTPolicyEnforcer_h
+#define CTPolicyEnforcer_h
+
+#include "CTLog.h"
+#include "CTVerifyResult.h"
+#include "mozpkix/Result.h"
+
+namespace mozilla {
+namespace ct {
+
+// Information about the compliance of the TLS connection with the
+// Certificate Transparency policy.
+enum class CTPolicyCompliance {
+  // Compliance not checked or not applicable.
+  Unknown,
+  // The connection complied with the certificate policy
+  // by including SCTs that satisfy the policy.
+  Compliant,
+  // The connection did not have enough valid SCTs to comply.
+  NotEnoughScts,
+  // The connection had enough valid SCTs, but the diversity requirement
+  // was not met (the number of CT log operators independent of the CA
+  // and of each other is too low).
+  NotDiverseScts,
+};
+
+// Checks whether a TLS connection complies with the current CT policy.
+// The implemented policy is based on the Mozilla CT Policy draft 0.1.0
+// (see https://docs.google.com/document/d/
+// 1rnqYYwscAx8WhS-MCdTiNzYQus9e37HuVyafQvEeNro/edit).
+//
+// NOTE: CT DIVERSITY REQUIREMENT IS TBD, PENDING FINALIZATION
+// OF MOZILLA CT POLICY. Specifically:
+// 1. CT log operators being CA-dependent is not currently taken into account
+// (see CTDiversityPolicy.h).
+// 2. The preexisting certificate exception provision of the operator diversity
+// requirement is not implemented (see "CT Qualified" section of the policy and
+// CheckOperatorDiversityCompliance in CTPolicyEnforcer.cpp).
+class CTPolicyEnforcer {
+ public:
+  // |verifiedSct| - SCTs present on the connection along with their
+  // verification status.
+  // |certLifetimeInCalendarMonths| - certificate lifetime in full calendar
+  // months (i.e. rounded down), based on the notBefore/notAfter fields.
+  // |dependentOperators| - which CT log operators are dependent on the CA
+  // that issued the certificate. SCTs issued by logs associated with such
+  // operators are treated differenly when evaluating the policy.
+  // See CTDiversityPolicy class.
+  // |compliance| - the result of the compliance check.
+  void CheckCompliance(const VerifiedSCTList& verifiedScts,
+                       size_t certLifetimeInCalendarMonths,
+                       const CTLogOperatorList& dependentOperators,
+                       CTPolicyCompliance& compliance);
+};
+
+}  // namespace ct
+}  // namespace mozilla
+
+#endif  // CTPolicyEnforcer_h