gnutls\_hmac\_fast(3) gnutls gnutls\_hmac\_fast(3)

# [NAME](#NAME)

gnutls\_hmac\_fast - API function

# [SYNOPSIS](#SYNOPSIS)

**#include <gnutls/crypto.h>**

**int gnutls\_hmac\_fast(gnutls\_mac\_algorithm\_t algorithm, const void * key, size\_t keylen, const void * ptext, size\_t ptext\_len, void * digest);**

# [ARGUMENTS](#ARGUMENTS)

[gnutls\_mac\_algorithm\_t algorithm](#gnutls_mac_algorithm_t)

the hash algorithm to use

[const void * key](#const)

the key to use

[size\_t keylen](#size_t)

the length of the key

[const void * ptext](#const~2)

the data to hash

[size\_t ptext\_len](#size_t~2)

the length of data to hash

[void * digest](#void)

is the output value of the hash

# [DESCRIPTION](#DESCRIPTION)

This convenience function will hash the given data and return output on a single call. Note, this call will not work for MAC algorithms that require nonce (like UMAC or GMAC).

# [RETURNS](#RETURNS)

Zero or a negative error code on error.

# [SINCE](#SINCE)

2.10.0

# [REPORTING BUGS](#REPORTING_BUGS)

Report bugs to <bugs@gnutls.org>.  
Home page: https://www.gnutls.org

# [COPYRIGHT](#COPYRIGHT)

Copyright © 2001-2023 Free Software Foundation, Inc., and others.  
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

# [SEE ALSO](#SEE_ALSO)

The full documentation for **gnutls** is maintained as a Texinfo manual. If the /usr/share/doc/gnutls/ directory does not contain the HTML form visit

[https://www.gnutls.org/manual/](https://www.gnutls.org/manual/)

3.8.13 gnutls

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Document: gnutls_hmac_fast(3) from gnutls 3.8.13-r3 (Chainguard OS)
Source: https://gitlab.com/gnutls/gnutls