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

# FC_SignUpdate

## Name

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FC_SignUpdate - process the next block of a multi-part signing operation.

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## Syntax

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```{code}

CK_RV FC_SignUpdate(

  CK_SESSION_HANDLE hSession,

  CK_BYTE_PTR pPart,

  CK_ULONG usPartLen

);

```

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## Parameters

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`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.

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## Description

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`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`.

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## Return value

## Examples

## See also

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- {ref}`mozilla-projects-nss-reference-fc-signinit`,

  {ref}`mozilla-projects-nss-reference-fc-signfinal`, [NSC_SignUpdate](/en-US/NSC_SignUpdate)

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