1gnutls_prf_raw(3)                   gnutls                   gnutls_prf_raw(3)
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NAME

6       gnutls_prf_raw - access the TLS PRF directly
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SYNOPSIS

9       #include <gnutls/gnutls.h>
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11       int  gnutls_prf_raw(gnutls_session_t  session, size_t label_size, const
12       char * label, size_t seed_size, const char * seed, size_t outsize, char
13       * out);
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ARGUMENTS

16       gnutls_session_t session
17                   is a gnutls_session_t structure.
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19       size_t label_size
20                   length of the label variable.
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22       const char * label
23                   label used in PRF computation, typically a short string.
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25       size_t seed_size
26                   length of the seed variable.
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28       const char * seed
29                   optional extra data to seed the PRF with.
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31       size_t outsize
32                   size of pre-allocated output buffer to hold the output.
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34       char * out  pre-allocate buffer to hold the generated data.
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DESCRIPTION

37       Apply  the  TLS Pseudo-Random-Function (PRF) using the master secret on
38       some data.
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40       The label variable usually contain a string denoting  the  purpose  for
41       the  generated  data.  The seed usually contain data such as the client
42       and server random, perhaps together with some additional data  that  is
43       added to guarantee uniqueness of the output for a particular purpose.
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45       Because the output is not guaranteed to be unique for a particular ses‐
46       sion unless seed include the client random  and  server  random  fields
47       (the  PRF would output the same data on another connection resumed from
48       the first one), it is not recommended to use  this  function  directly.
49       The  gnutls_prf() function seed the PRF with the client and server ran‐
50       dom fields directly, and is recommended if you want to generate  pseudo
51       random data unique for each session.
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RETURNS

54       GNUTLS_E_SUCCESS on success, or an error code.
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REPORTING BUGS

57       Report    bugs    to    <bug-gnutls@gnu.org>.     GnuTLS   home   page:
58       http://www.gnu.org/software/gnutls/ General help  using  GNU  software:
59       http://www.gnu.org/gethelp/
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62       Copyright © 2008 Free Software Foundation.
63       Copying  and  distribution  of this file, with or without modification,
64       are permitted in any medium  without  royalty  provided  the  copyright
65       notice and this notice are preserved.
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SEE ALSO

68       The  full  documentation  for gnutls is maintained as a Texinfo manual.
69       If the info and gnutls programs are properly installed  at  your  site,
70       the command
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72              info gnutls
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74       should give you access to the complete manual.
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78gnutls                               2.8.6                   gnutls_prf_raw(3)
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