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diff --git a/security/nss/lib/libpkix/include/pkix_checker.h b/security/nss/lib/libpkix/include/pkix_checker.h
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+/* 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/. */
+/*
+ * This file defines functions associated with the PKIX_CertChainChecker type.
+ *
+ */
+
+#ifndef _PKIX_CHECKER_H
+#define _PKIX_CHECKER_H
+
+#include "pkixt.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* General
+ *
+ * Please refer to the libpkix Programmer's Guide for detailed information
+ * about how to use the libpkix library. Certain key warnings and notices from
+ * that document are repeated here for emphasis.
+ *
+ * All identifiers in this file (and all public identifiers defined in
+ * libpkix) begin with "PKIX_". Private identifiers only intended for use
+ * within the library begin with "pkix_".
+ *
+ * A function returns NULL upon success, and a PKIX_Error pointer upon failure.
+ *
+ * Unless otherwise noted, for all accessor (gettor) functions that return a
+ * PKIX_PL_Object pointer, callers should assume that this pointer refers to a
+ * shared object. Therefore, the caller should treat this shared object as
+ * read-only and should not modify this shared object. When done using the
+ * shared object, the caller should release the reference to the object by
+ * using the PKIX_PL_Object_DecRef function.
+ *
+ * While a function is executing, if its arguments (or anything referred to by
+ * its arguments) are modified, free'd, or destroyed, the function's behavior
+ * is undefined.
+ *
+ */
+
+/* PKIX_CertChainChecker
+ *
+ * PKIX_CertChainCheckers provide a standard way for the caller to insert their
+ * own custom checks to validate certificates. This may be useful in many
+ * scenarios, including when the caller wishes to validate private certificate
+ * extensions. The CheckCallback allows custom certificate processing to take
+ * place. Additionally, a CertChainChecker can optionally maintain state
+ * between successive calls to the CheckCallback. This certChainCheckerState
+ * must be an Object (although any object type), allowing it to be
+ * reference-counted and allowing it to provide the standard Object functions
+ * (Equals, Hashcode, ToString, Compare, Duplicate). If the caller wishes
+ * their CertChainChecker to be used during chain building, their
+ * certChainCheckerState object must implement an appropriate Duplicate
+ * function. The builder uses this Duplicate function when backtracking.
+ *
+ * Once the caller has created a CertChainChecker object, the caller then
+ * specifies a CertChainChecker object in a ProcessingParams object
+ * and passes the ProcessingParams object to PKIX_ValidateChain or
+ * PKIX_BuildChain, which uses the objects to call the user's callback
+ * functions as needed during the validation or building process.
+ *
+ * A CertChainChecker may be presented certificates in the "reverse" direction
+ * (from trust anchor to target) or in the "forward" direction (from target to
+ * trust anchor). All CertChainCheckers must support "reverse checking", while
+ * support for "forward checking" is optional, but recommended. If "forward
+ * checking" is not supported, building chains may be much less efficient. The
+ * PKIX_CertChainChecker_IsForwardCheckingSupported function is used to
+ * determine whether forward checking is supported, and the
+ * PKIX_CertChainChecker_IsForwardDirectionExpected function is used to
+ * determine whether the CertChainChecker has been initialized to expect the
+ * certificates to be presented in the "forward" direction.
+ */
+
+/*
+ * FUNCTION: PKIX_CertChainChecker_CheckCallback
+ * DESCRIPTION:
+ *
+ *  This callback function checks whether the specified Cert pointed to by
+ *  "cert" is valid using "checker's" internal certChainCheckerState (if any)
+ *  and removes the critical extensions that it processes (if any) from the
+ *  List of OIDs (possibly empty) pointed to by "unresolvedCriticalExtensions".
+ *  If the checker finds that the certificate is not valid, an Error pointer is
+ *  returned.
+ *
+ *  If the checker uses non-blocking I/O, the address of a platform-dependent
+ *  non-blocking I/O context ("nbioContext") will be stored at "pNBIOContext",
+ *  which the caller may use, in a platform-dependent way, to wait, poll, or
+ *  otherwise determine when to try again. If the checker does not use
+ *  non-blocking I/O, NULL will always be stored at "pNBIOContext". If a non-NULL
+ *  value was stored, on a subsequent call the checker will attempt to complete
+ *  the pending I/O and, if successful, NULL will be stored at "pNBIOContext".
+ *
+ * PARAMETERS:
+ *  "checker"
+ *      Address of CertChainChecker whose certChainCheckerState and
+ *      CheckCallback logic is to be used. Must be non-NULL.
+ *  "cert"
+ *      Address of Cert that is to be validated using "checker".
+ *      Must be non-NULL.
+ *  "unresolvedCriticalExtensions"
+ *      Address of List of OIDs that represents the critical certificate
+ *      extensions that have yet to be resolved. This parameter may be
+ *      modified during the function call. Must be non-NULL.
+ *  "pNBIOContext"
+ *      Address at which is stored a platform-dependent structure indicating
+ *      whether checking was suspended for non-blocking I/O. Must be non-NULL.
+ *  "plContext"
+ *      Platform-specific context pointer.
+ * THREAD SAFETY:
+ *  Thread Safe
+ *
+ *  Multiple threads must be able to safely call this function without
+ *  worrying about conflicts, even if they're operating on the same object.
+ * RETURNS:
+ *  Returns NULL if the function succeeds.
+ *  Returns a CertChainChecker Error if the function fails in a non-fatal way.
+ *  Returns a Fatal Error if the function fails in an unrecoverable way.
+ */
+typedef PKIX_Error *
+(*PKIX_CertChainChecker_CheckCallback)(
+        PKIX_CertChainChecker *checker,
+        PKIX_PL_Cert *cert,
+        PKIX_List *unresolvedCriticalExtensions,  /* list of PKIX_PL_OID */
+        void **pNBIOContext,
+        void *plContext);
+
+/*
+ * FUNCTION: PKIX_CertChainChecker_Create
+ * DESCRIPTION:
+ *
+ *  Creates a new CertChainChecker and stores it at "pChecker". The new
+ *  CertChainChecker uses the CheckCallback pointed to by "callback" as its
+ *  callback function. It uses the Object pointed to by "initialState" (if
+ *  any) as its initial state. As noted above, the initial state Object must
+ *  provide a custom implementation of PKIX_PL_Object_Duplicate if the
+ *  CertChainChecker is to be used during certificate chain building.
+ *
+ *  A CertChainChecker may be presented certificates in the "reverse"
+ *  direction (from trust anchor to target) or in the "forward" direction
+ *  (from target to trust anchor). All CertChainCheckers must support
+ *  "reverse checking", while support for "forward checking" is optional. The
+ *  CertChainChecker is initialized with two Boolean flags that deal with this
+ *  distinction: "forwardCheckingSupported" and "forwardDirectionExpected".
+ *  If the "forwardCheckingSupported" Boolean flag is TRUE, it indicates that
+ *  this CertChainChecker is capable of checking certificates in the "forward"
+ *  direction (as well as the "reverse" direction, which all CertChainCheckers
+ *  MUST support). The "forwardDirectionExpected" Boolean flag indicates in
+ *  which direction the CertChainChecker should expect the certificates to be
+ *  presented. This is particularly useful for CertChainCheckers that are
+ *  capable of checking in either the "forward" direction or the "reverse"
+ *  direction, but have different processing steps depending on the direction.
+ *
+ *  The CertChainChecker also uses the List of OIDs pointed to by "extensions"
+ *  as the supported certificate extensions. All certificate extensions that
+ *  the CertChainChecker might possibly recognize and be able to process
+ *  should be included in the List of supported extensions. If "checker" does
+ *  not recognize or process any certificate extensions, "extensions" should
+ *  be set to NULL.
+ *
+ * PARAMETERS:
+ *  "callback"
+ *      The CheckCallback function to be used. Must be non-NULL.
+ *  "forwardCheckingSupported"
+ *      A Boolean value indicating whether or not this CertChainChecker is
+ *      capable of checking certificates in the "forward" direction.
+ *  "forwardDirectionExpected"
+ *      A Boolean value indicating whether or not this CertChainChecker should
+ *      be used to check in the "forward" direction.
+ *  "extensions"
+ *      Address of List of OIDs representing the supported extensions.
+ *  "initialState"
+ *      Address of Object representing the CertChainChecker's initial state
+ *      (if any).
+ *  "pChecker"
+ *      Address where object pointer will be stored. Must be non-NULL.
+ *  "plContext"
+ *      Platform-specific context pointer.
+ * THREAD SAFETY:
+ *  Thread Safe (see Thread Safety Definitions in Programmer's Guide)
+ * RETURNS:
+ *  Returns NULL if the function succeeds.
+ *  Returns a CertChainChecker Error if the function fails in a non-fatal way.
+ *  Returns a Fatal Error if the function fails in an unrecoverable way.
+ */
+PKIX_Error *
+PKIX_CertChainChecker_Create(
+    PKIX_CertChainChecker_CheckCallback callback,
+    PKIX_Boolean forwardCheckingSupported,
+    PKIX_Boolean forwardDirectionExpected,
+    PKIX_List *extensions,  /* list of PKIX_PL_OID */
+    PKIX_PL_Object *initialState,
+    PKIX_CertChainChecker **pChecker,
+    void *plContext);
+
+/*
+ * FUNCTION: PKIX_CertChainChecker_GetCheckCallback
+ * DESCRIPTION:
+ *
+ *  Retrieves a pointer to "checker's" Check callback function and puts it in
+ *  "pCallback".
+ *
+ * PARAMETERS:
+ *  "checker"
+ *      The CertChainChecker whose Check callback is desired. Must be non-NULL.
+ *  "pCallback"
+ *      Address where Check callback function pointer will be stored.
+ *      Must be non-NULL.
+ *  "plContext"
+ *      Platform-specific context pointer.
+ * THREAD SAFETY:
+ *  Thread Safe (see Thread Safety Definitions in Programmer's Guide)
+ * RETURNS:
+ *  Returns NULL if the function succeeds.
+ *  Returns a CertChainChecker Error if the function fails in a non-fatal way.
+ *  Returns a Fatal Error if the function fails in an unrecoverable way.
+ */
+PKIX_Error *
+PKIX_CertChainChecker_GetCheckCallback(
+        PKIX_CertChainChecker *checker,
+        PKIX_CertChainChecker_CheckCallback *pCallback,
+        void *plContext);
+
+/*
+ * FUNCTION: PKIX_CertChainChecker_IsForwardCheckingSupported
+ * DESCRIPTION:
+ *
+ *  Checks whether forward checking is supported by the CertChainChecker
+ *  pointed to by "checker" and stores the Boolean result at
+ *  "pForwardCheckingSupported".
+ *
+ *  A CertChainChecker may be presented certificates in the "reverse"
+ *  direction (from trust anchor to target) or in the "forward" direction
+ *  (from target to trust anchor). All CertChainCheckers must support
+ *  "reverse checking", while support for "forward checking" is optional. This
+ *  function is used to determine whether forward checking is supported.
+ *
+ * PARAMETERS:
+ *  "checker"
+ *      The CertChainChecker whose ability to validate certificates in the
+ *      "forward" direction is to be checked. Must be non-NULL.
+ *  "pForwardCheckingSupported"
+ *      Destination of the Boolean result. Must be non-NULL.
+ *  "plContext"
+ *      Platform-specific context pointer.
+ * THREAD SAFETY:
+ *  Thread Safe (see Thread Safety Definitions in Programmer's Guide)
+ * RETURNS:
+ *  Returns NULL if the function succeeds.
+ *  Returns a CertChainChecker Error if the function fails in a non-fatal way.
+ *  Returns a Fatal Error if the function fails in an unrecoverable way.
+ */
+PKIX_Error *
+PKIX_CertChainChecker_IsForwardCheckingSupported(
+        PKIX_CertChainChecker *checker,
+        PKIX_Boolean *pForwardCheckingSupported,
+        void *plContext);
+
+/*
+ * FUNCTION: PKIX_CertChainChecker_IsForwardDirectionExpected
+ * DESCRIPTION:
+ *
+ *  Checks whether the CertChainChecker pointed to by "checker" has been
+ *  initialized to expect the certificates to be presented in the "forward"
+ *  direction and stores the Boolean result at "pForwardDirectionExpected".
+ *
+ *  A CertChainChecker may be presented certificates in the "reverse"
+ *  direction (from trust anchor to target) or in the "forward" direction
+ *  (from target to trust anchor). All CertChainCheckers must support
+ *  "reverse checking", while support for "forward checking" is optional. This
+ *  function is used to determine in which direction the CertChainChecker
+ *  expects the certificates to be presented.
+ *
+ * PARAMETERS:
+ *  "checker"
+ *      The CertChainChecker that has been initialized to expect certificates
+ *      in either the "forward" or "reverse" directions. Must be non-NULL.
+ *  "pForwardDirectionExpected"
+ *      Destination of the Boolean result. Must be non-NULL.
+ *  "plContext"
+ *      Platform-specific context pointer.
+ * THREAD SAFETY:
+ *  Thread Safe (see Thread Safety Definitions in Programmer's Guide)
+ * RETURNS:
+ *  Returns NULL if the function succeeds.
+ *  Returns a CertChainChecker Error if the function fails in a non-fatal way.
+ *  Returns a Fatal Error if the function fails in an unrecoverable way.
+ */
+PKIX_Error *
+PKIX_CertChainChecker_IsForwardDirectionExpected(
+        PKIX_CertChainChecker *checker,
+        PKIX_Boolean *pForwardDirectionExpected,
+        void *plContext);
+
+/*
+ * FUNCTION: PKIX_CertChainChecker_GetSupportedExtensions
+ * DESCRIPTION:
+ *
+ *  Retrieves a pointer to a List of OIDs (each OID corresponding to a
+ *  certificate extension supported by the CertChainChecker pointed to by
+ *  "checker") and stores it at "pExtensions". All certificate extensions that
+ *  the CertChainChecker might possibly recognize and be able to process
+ *  should be included in the List of supported extensions. If "checker" does
+ *  not recognize or process any certificate extensions, this function stores
+ *  NULL at "pExtensions".
+ *
+ *  Note that the List returned by this function is immutable.
+ *
+ * PARAMETERS:
+ *  "checker"
+ *      Address of CertChainChecker whose supported extension OIDs are to be
+ *      stored. Must be non-NULL.
+ *  "pExtensions"
+ *      Address where object pointer will be stored. Must be non-NULL.
+ *  "plContext"
+ *      Platform-specific context pointer.
+ * THREAD SAFETY:
+ *  Thread Safe (see Thread Safety Definitions in Programmer's Guide)
+ * RETURNS:
+ *  Returns NULL if the function succeeds.
+ *  Returns a CertChainChecker Error if the function fails in a non-fatal way.
+ *  Returns a Fatal Error if the function fails in an unrecoverable way.
+ */
+PKIX_Error *
+PKIX_CertChainChecker_GetSupportedExtensions(
+        PKIX_CertChainChecker *checker,
+        PKIX_List **pExtensions, /* list of PKIX_PL_OID */
+        void *plContext);
+
+/*
+ * FUNCTION: PKIX_CertChainChecker_GetCertChainCheckerState
+ * DESCRIPTION:
+ *
+ *  Retrieves a pointer to a PKIX_PL_Object representing the internal state
+ *  (if any) of the CertChainChecker pointed to by "checker" and stores it at
+ *  "pCertChainCheckerState".
+ *
+ * PARAMETERS:
+ *  "checker"
+ *      Address of CertChainChecker whose state is to be stored.
+ *      Must be non-NULL.
+ *  "pCertChainCheckerState"
+ *      Address where object pointer will be stored. Must be non-NULL.
+ *  "plContext"
+ *      Platform-specific context pointer.
+ * THREAD SAFETY:
+ *  Conditionally Thread Safe
+ *      (see Thread Safety Definitions in Programmer's Guide)
+ * RETURNS:
+ *  Returns NULL if the function succeeds.
+ *  Returns a CertChainChecker Error if the function fails in a non-fatal way.
+ *  Returns a Fatal Error if the function fails in an unrecoverable way.
+ */
+PKIX_Error *
+PKIX_CertChainChecker_GetCertChainCheckerState(
+        PKIX_CertChainChecker *checker,
+        PKIX_PL_Object **pCertChainCheckerState,
+        void *plContext);
+
+/*
+ * FUNCTION: PKIX_CertChainChecker_SetCertChainCheckerState
+ * DESCRIPTION:
+ *
+ *  Sets the internal state of the CertChainChecker pointed to by "checker"
+ *  using the Object pointed to by "certChainCheckerState". If "checker" needs
+ *  a NULL internal state, "certChainCheckerState" should be set to NULL.
+ *
+ * PARAMETERS:
+ *  "checker"
+ *      Address of CertChainChecker whose state is to be set. Must be non-NULL.
+ *  "certChainCheckerState"
+ *      Address of Object representing internal state.
+ *  "plContext"
+ *      Platform-specific context pointer.
+ * THREAD SAFETY:
+ *  Not Thread Safe - assumes exclusive access to "checker"
+ *  (see Thread Safety Definitions in Programmer's Guide)
+ * RETURNS:
+ *  Returns NULL if the function succeeds.
+ *  Returns a CertChainChecker Error if the function fails in a non-fatal way.
+ *  Returns a Fatal Error if the function fails in an unrecoverable way.
+ */
+PKIX_Error *
+PKIX_CertChainChecker_SetCertChainCheckerState(
+        PKIX_CertChainChecker *checker,
+        PKIX_PL_Object *certChainCheckerState,
+        void *plContext);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _PKIX_CHECKER_H */