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(mozilla-projects-nss-reference-fc-digestinit)=
# FC_DigestInit
## [Name](#name)
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FC_DigestInit - initialize a message-digest operation.
:::
## [Syntax](#syntax)
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```{code}
CK_RV FC_DigestInit(
CK_SESSION_HANDLE hSession,
CK_MECHANISM_PTR pMechanism
);
```
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## [Parameters](#parameters)
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`hSession`
: [in] session handle.
`pMechanism`
: [in] mechanism to be used for the subsequent digest operation.
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## [Description](#description)
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`FC_DigestInit` initializes a message-digest operation.
A user may call `FC_DigestInit` without logging into the token (to assume the NSS User role).
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## [Return value](#return_value)
## [Examples](#examples)
## [See also](#see_also)
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- [NSC_DigestInit](/en-US/NSC_DigestInit)
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