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gnutls_prf_raw(3)                   gnutls                   gnutls_prf_raw(3)


NAME

       gnutls_prf_raw - API function


SYNOPSIS

       #include <gnutls/gnutls.h>

       int gnutls_prf_raw(gnutls_session_t session, size_t label_size, const
       char * label, size_t seed_size, const char * seed, size_t outsize, char
       * out);


ARGUMENTS

       gnutls_session_t session
                   is a gnutls_session_t type.

       size_t label_size
                   length of the  label variable.

       const char * label
                   label used in PRF computation, typically a short string.

       size_t seed_size
                   length of the  seed variable.

       const char * seed
                   optional extra data to seed the PRF with.

       size_t outsize
                   size of pre-allocated output buffer to hold the output.

       char * out  pre-allocated buffer to hold the generated data.


DESCRIPTION

       Apply the TLS Pseudo-Random-Function (PRF) on the master secret and the
       provided data.

       The  label variable usually contains a string denoting the purpose for
       the generated data.  The  seed usually contains data such as the client
       and server random, perhaps together with some additional data that is
       added to guarantee uniqueness of the output for a particular purpose.

       Because the output is not guaranteed to be unique for a particular
       session unless  seed includes the client random and server random
       fields (the PRF would output the same data on another connection
       resumed from the first one), it is not recommended to use this function
       directly.  The gnutls_prf() function seeds the PRF with the client and
       server random fields directly, and is recommended if you want to
       generate pseudo random data unique for each session.


NOTE

       This function will only operate under TLS versions prior to 1.3.  In
       TLS1.3 the use of PRF is replaced with HKDF and the generic exporters
       like gnutls_prf_rfc5705() should be used instead. Under TLS1.3 this
       function returns GNUTLS_E_INVALID_REQUEST.


RETURNS

       GNUTLS_E_SUCCESS on success, or an error code.


REPORTING BUGS

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


COPYRIGHT

       Copyright (C) 2001- 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

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

       https://www.gnutls.org/manual/

gnutls                               3.7.9                   gnutls_prf_raw(3)

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