(mozilla-projects-nss-reference-fc-signfinal)=

# FC_SignFinal

## [Name](#name)

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FC_SignFinal - finish a multi-part signing operation.
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## [Syntax](#syntax)

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```{code}
CK_RV FC_SignFinal(
  CK_SESSION_HANDLE hSession,
  CK_BYTE_PTR pSignature,
  CK_ULONG_PTR pusSignatureLen
);
```

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## [Parameters](#parameters)

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`hSession`

: [in] session handle.

`pSignature`

: [out] pointer to the buffer which will receive the digest or NULL.

`pusSignatureLen`

: [in, out] pointer to location containing the maximum buffer size.
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## [Description](#description)

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`FC_SignFinal` finishes a multi-part signing operation by returning the complete signature and
clearing the operation context. If `pSignature` is NULL the length of the signature is returned
and `FC_SignFinal` may be called again with `pSignature` set to retrieve the signature.

A user must log into the token (to assume the NSS User role) before calling `FC_SignFinal`.
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## [Return value](#return_value)

## [Examples](#examples)

## [See also](#see_also)

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- {ref}`mozilla_projects_nss_reference_fc_signupdate`, [NSC_SignFinal](/en-US/NSC_SignFinal)
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