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+.\" DO NOT MODIFY THIS FILE!  It was generated by gdoc.
+.TH "gnutls_prf" 3 "3.7.9" "gnutls" "gnutls"
+.SH NAME
+gnutls_prf \- API function
+.SH SYNOPSIS
+.B #include <gnutls/gnutls.h>
+.sp
+.BI "int gnutls_prf(gnutls_session_t " session ", size_t " label_size ", const char * " label ", int " server_random_first ", size_t " extra_size ", const char * " extra ", size_t " outsize ", char * " out ");"
+.SH ARGUMENTS
+.IP "gnutls_session_t session" 12
+is a \fBgnutls_session_t\fP type.
+.IP "size_t label_size" 12
+length of the  \fIlabel\fP variable.
+.IP "const char * label" 12
+label used in PRF computation, typically a short string.
+.IP "int server_random_first" 12
+non\-zero if server random field should be first in seed
+.IP "size_t extra_size" 12
+length of the  \fIextra\fP variable.
+.IP "const char * extra" 12
+optional extra data to seed the PRF with.
+.IP "size_t outsize" 12
+size of pre\-allocated output buffer to hold the output.
+.IP "char * out" 12
+pre\-allocated buffer to hold the generated data.
+.SH "DESCRIPTION"
+Applies the TLS Pseudo\-Random\-Function (PRF) on the master secret
+and the provided data, seeded with the client and server random fields.
+For the key expansion specified in RFC5705 see \fBgnutls_prf_rfc5705()\fP.
+
+The  \fIlabel\fP variable usually contains a string denoting the purpose
+for the generated data.  The  \fIserver_random_first\fP indicates whether
+the client random field or the server random field should be first
+in the seed.  Non\-zero indicates that the server random field is first,
+0 that the client random field is first.
+
+The  \fIextra\fP variable can be used to add more data to the seed, after
+the random variables.  It can be used to make sure the
+generated output is strongly connected to some additional data
+(e.g., a string used in user authentication).
+
+The output is placed in  \fIout\fP , which must be pre\-allocated.
+.SH "NOTE"
+This function produces identical output with \fBgnutls_prf_rfc5705()\fP
+when  \fIserver_random_first\fP is set to 0 and  \fIextra\fP is \fBNULL\fP. Under TLS1.3
+this function will only operate when these conditions are true, or otherwise
+return \fBGNUTLS_E_INVALID_REQUEST\fP.
+.SH "RETURNS"
+\fBGNUTLS_E_SUCCESS\fP on success, or an error code.
+.SH "REPORTING BUGS"
+Report bugs to <bugs@gnutls.org>.
+.br
+Home page: https://www.gnutls.org
+
+.SH COPYRIGHT
+Copyright \(co 2001- Free Software Foundation, Inc., and others.
+.br
+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.
+.SH "SEE ALSO"
+The full documentation for
+.B gnutls
+is maintained as a Texinfo manual.
+If the /usr/share/doc/gnutls/
+directory does not contain the HTML form visit
+.B
+.IP https://www.gnutls.org/manual/
+.PP