.. _mozilla_projects_nss_reference_fc_decrypt:

FC_Decrypt
==========

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

.. container::

   FC_Decrypt - Decrypt a block of data.

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

.. container::

   .. code::

      CK_RV FC_Decrypt(
        CK_SESSION_HANDLE hSession,
        CK_BYTE_PTR pEncryptedData,
        CK_ULONG usEncryptedDataLen,
        CK_BYTE_PTR pData,
        CK_ULONG_PTR pusDataLen
      );

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

.. container::

   ``hSession``
      [in] session handle.
   ``pEncryptedData``
      [in] pointer to encrypted data block.
   ``usEncryptedDataLen``
      [in] length of the data in bytes.
   ``pData``
      [out] pointer to location where recovered data is to be stored.
   ``pusDataLen``
      [in,out] pointer to location where the length of recovered data is to be stored.

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

.. container::

   ``FC_Decrypt`` decrypts a block of data according to the attributes of the previous call to
   ``FC_DecryptInit``.

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


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

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


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

.. container::

   -  :ref:`mozilla_projects_nss_reference_fc_decryptinit`, `NSC_Decrypt </en-US/NSC_Decrypt>`__