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+.\" DO NOT MODIFY THIS FILE!  It was generated by gdoc.
+.TH "gnutls_prf_early" 3 "3.7.9" "gnutls" "gnutls"
+.SH NAME
+gnutls_prf_early \- API function
+.SH SYNOPSIS
+.B #include <gnutls/gnutls.h>
+.sp
+.BI "int gnutls_prf_early(gnutls_session_t " session ", size_t " label_size ", const char * " label ", size_t " context_size ", const char * " context ", 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 "size_t context_size" 12
+length of the  \fIextra\fP variable.
+.IP "const char * context" 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"
+This function is similar to \fBgnutls_prf_rfc5705()\fP, but only works in
+TLS 1.3 or later to export early keying material.
+
+Note that the keying material is only available after the
+ClientHello message is processed and before the application traffic
+keys are established.  Therefore this function shall be called in a
+handshake hook function for \fBGNUTLS_HANDSHAKE_CLIENT_HELLO\fP.
+
+The  \fIlabel\fP variable usually contains a string denoting the purpose
+for the generated data.
+
+The  \fIcontext\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.
+
+Note that, to provide the RFC5705 context, the  \fIcontext\fP variable
+must be non\-null.
+.SH "RETURNS"
+\fBGNUTLS_E_SUCCESS\fP on success, or an error code.
+.SH "SINCE"
+3.6.8
+.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