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diff --git a/security/ct/CTDiversityPolicy.h b/security/ct/CTDiversityPolicy.h
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+++ b/security/ct/CTDiversityPolicy.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 CTDiversityPolicy_h
+#define CTDiversityPolicy_h
+
+#include "CTLog.h"
+#include "CTVerifyResult.h"
+#include "certt.h"
+#include "mozpkix/Result.h"
+
+namespace mozilla {
+namespace ct {
+
+// Retuns the list of unique CT log operator IDs appearing in the provided
+// list of verified SCTs.
+void GetCTLogOperatorsFromVerifiedSCTList(const VerifiedSCTList& list,
+                                          CTLogOperatorList& operators);
+
+// Helper class used by CTPolicyEnforcer to check the CT log operators
+// diversity requirements of the CT Policy.
+// See CTPolicyEnforcer.h for more details.
+class CTDiversityPolicy {
+ public:
+  // Given a certificate chain and a set of CT log operators,
+  // returns the subset of log operators that are dependent on the CA
+  // issuing the certificate (as defined by the CT Policy).
+  //
+  // NOTE: TBD, PENDING FINALIZATION OF MOZILLA CT POLICY.
+  pkix::Result GetDependentOperators(const CERTCertList* builtChain,
+                                     const CTLogOperatorList& operators,
+                                     CTLogOperatorList& dependentOperators);
+};
+
+}  // namespace ct
+}  // namespace mozilla
+
+#endif  // CTDiversityPolicy_h