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CentOS 7.0 - man page for gnutls_priority_init (centos section 3)

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 priori-
       ties to enable.	Some keywords are defined to provide 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 man-
       ual from:

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

gnutls					      3.1.15			  gnutls_priority_init(3)


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