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+.. _mozilla_projects_nss_reference_fc_signupdate:
+
+FC_SignUpdate
+=============
+
+`Name <#name>`__
+~~~~~~~~~~~~~~~~
+
+.. container::
+
+   FC_SignUpdate - process the next block of a multi-part signing operation.
+
+`Syntax <#syntax>`__
+~~~~~~~~~~~~~~~~~~~~
+
+.. container::
+
+   .. code::
+
+      CK_RV FC_SignUpdate(
+        CK_SESSION_HANDLE hSession,
+        CK_BYTE_PTR pPart,
+        CK_ULONG usPartLen
+      );
+
+`Parameters <#parameters>`__
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. container::
+
+   ``hSession``
+      [in] session handle.
+   ``pPart``
+      [in] pointer to the next block of the data to be signed.
+   ``usPartLen``
+      [in] length of data block in bytes.
+
+`Description <#description>`__
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. container::
+
+   ``FC_SignUpdate`` starts or continues a multi-part signature operation. One or more blocks may be
+   part of the signature. The signature for the entire message is returned by a call to
+   :ref:`mozilla_projects_nss_reference_fc_signfinal`.
+
+   A user must log into the token (to assume the NSS User role) before calling ``FC_SignUpdate``.
+
+.. _return_value:
+
+`Return value <#return_value>`__
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. container::
+
+`Examples <#examples>`__
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. container::
+
+.. _see_also:
+
+`See also <#see_also>`__
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. container::
+
+   -  :ref:`mozilla_projects_nss_reference_fc_signinit`,
+      :ref:`mozilla_projects_nss_reference_fc_signfinal`, `NSC_SignUpdate </en-US/NSC_SignUpdate>`__
+\ No newline at end of file