centos man page for gnutls_priority_init

gnutls_priority_init(3) 					      gnutls						   gnutls_priority_init(3)

NAME
       gnutls_priority_init - API function

SYNOPSIS
       #include <gnutls/gnutls.h>

       int gnutls_priority_init(gnutls_priority_t * priority_cache, const char * priorities, const char ** err_pos);

ARGUMENTS
       gnutls_priority_t * priority_cache
		   is a gnutls_prioritity_t structure.

       const char * priorities
		   is a string describing priorities

       const char ** err_pos
		   In case of an error this will have the position in the string the error occured

DESCRIPTION
       Sets priorities for the ciphers, key exchange methods, macs and compression methods.

       The  priorities	option allows you to specify a colon separated list of the cipher priorities to enable.  Some keywords are defined to pro-
       vide quick access to common preferences.

       "PERFORMANCE" means all the "secure" ciphersuites are enabled, limited to 128 bit ciphers and sorted by terms of speed performance.

       "NORMAL" means all "secure" ciphersuites. The 256-bit ciphers are included as a fallback only.  The ciphers are sorted by security margin.

       "PFS" means all "secure" ciphersuites that support perfect forward secrecy.  The 256-bit ciphers are included  as  a  fallback  only.   The
       ciphers are sorted by security margin.

       "SECURE128" means all "secure" ciphersuites of security level 128-bit or more.

       "SECURE192" means all "secure" ciphersuites of security level 192-bit or more.

       "SUITEB128" means all the NSA SuiteB ciphersuites with security level of 128.

       "SUITEB192" means all the NSA SuiteB ciphersuites with security level of 192.

       "EXPORT" means all ciphersuites are enabled, including the low-security 40 bit ciphers.

       "NONE" means nothing is enabled.  This disables even protocols and compression methods.

       Special	keywords  are "!", "-" and "+".  "!" or "-" appended with an algorithm will remove this algorithm.  "+" appended with an algorithm
       will add this algorithm.

       Check the GnuTLS manual section "Priority strings" for detailed information.

EXAMPLES
       "NONE:+VERS-TLS-ALL:+MAC-ALL:+RSA:+AES-128-CBC:+SIGN-ALL:+COMP-NULL"

       "NORMAL:-ARCFOUR-128" means normal ciphers except for ARCFOUR-128.

       "SECURE:-VERS-SSL3.0:+COMP-DEFLATE" means that only secure ciphers are enabled, SSL3.0 is disabled, and libz compression enabled.

       "NONE:+VERS-TLS-ALL:+AES-128-CBC:+RSA:+SHA1:+COMP-NULL:+SIGN-RSA-SHA1",

       "NONE:+VERS-TLS-ALL:+AES-128-CBC:+ECDHE-RSA:+SHA1:+COMP-NULL:+SIGN-RSA-SHA1:+CURVE-SECP256R1",

       "SECURE256:+SECURE128",

       Note that "NORMAL:COMPAT" is the most compatible mode.

RETURNS
       On syntax error GNUTLS_E_INVALID_REQUEST is returned, GNUTLS_E_SUCCESS on success, or an error code.

REPORTING BUGS
       Report bugs to <bug-gnutls@gnu.org>.
       General guidelines for reporting bugs: http://www.gnu.org/gethelp/
       GnuTLS home page: http://www.gnu.org/software/gnutls/

COPYRIGHT
       Copyright (C) 2012 Free Software Foundation, Inc..
       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 info and gnutls programs are properly installed at your site,
       the command

	      info gnutls

       should give you access to the complete manual.  As an alternative you may obtain the manual from:

	      http://www.gnu.org/software/gnutls/manual/

gnutls								      3.1.15						   gnutls_priority_init(3)