.. _mozilla_projects_nss_reference_fc_signrecover:

FC_SignRecover
==============

`Name <#name>`__
~~~~~~~~~~~~~~~~

.. container::

   FC_SignRecover - Sign data in a single recoverable operation.

`Syntax <#syntax>`__
~~~~~~~~~~~~~~~~~~~~

.. container::

   .. code::

      CK_RV FC_SignRecover(
        CK_SESSION_HANDLE hSession,
        CK_BYTE_PTR pData,
        CK_ULONG usDataLen,
        CK_BYTE_PTR pSignature,
        CK_ULONG_PTR pusSignatureLen
      );

`Parameters <#parameters>`__
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. container::

   ``hSession``
      [in] session handle.
   ``pData``
      [in] mechanism to be used for the signing operation.
   ``usDataLen``
      [in] handle of the key to be usedn.
   ``pSignature``
      [out] pointer to the buffer or NULL.
   ``pusSignatureLen``
      [in, out] pointer to the size of the output buffer, replaced by the length of the signature if
      the operation is successful.

`Description <#description>`__
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. container::

   ``FC_SignRecover`` signs data in a single operation where the (digest) data can be recovered from
   the signature. If ``pSignature`` is NULL only the length of the signature is returned in
   ``*pusSignatureLen``.

   A user must log into the token (to assume the NSS User role) before calling ``FC_SignRecover``.


`Return value <#return_value>`__
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`Examples <#examples>`__
~~~~~~~~~~~~~~~~~~~~~~~~


`See also <#see_also>`__
~~~~~~~~~~~~~~~~~~~~~~~~

.. container::

   -  `NSC_SignRecover </en-US/NSC_SignRecover>`__