1gnutls_hkdf_expand(3)               gnutls               gnutls_hkdf_expand(3)
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NAME

6       gnutls_hkdf_expand - API function
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SYNOPSIS

9       #include <gnutls/crypto.h>
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11       int gnutls_hkdf_expand(gnutls_mac_algorithm_t mac, const gnutls_datum_t
12       * key, const gnutls_datum_t * info, void * output, size_t length);
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ARGUMENTS

15       gnutls_mac_algorithm_t mac
16                   the mac algorithm used internally
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18       const gnutls_datum_t * key
19                   the pseudorandom key created with HKDF-Extract
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21       const gnutls_datum_t * info
22                   the optional informational data
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24       void * output
25                   the output value of the expand operation
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27       size_t length
28                   the desired length of the output key
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DESCRIPTION

31       This function will derive a variable length keying  material  from  the
32       pseudorandom key using the HKDF-Expand function as defined in RFC 5869.
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RETURNS

35       Zero or a negative error code on error.
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SINCE

38       3.6.13
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REPORTING BUGS

41       Report bugs to <bugs@gnutls.org>.
42       Home page: https://www.gnutls.org
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46       Copyright © 2001- Free Software Foundation, Inc., and others.
47       Copying  and  distribution  of this file, with or without modification,
48       are permitted in any medium without royalty provided the copyright  no‐
49       tice and this notice are preserved.
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SEE ALSO

52       The  full  documentation  for gnutls is maintained as a Texinfo manual.
53       If the /usr/share/doc/gnutls/ directory does not contain the HTML  form
54       visit
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56       https://www.gnutls.org/manual/
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58gnutls                               3.7.2               gnutls_hkdf_expand(3)
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