gnutls_priority_init man page on Archlinux

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gnutls_priority_init(3)		    gnutls	       gnutls_priority_init(3)

       gnutls_priority_init - API function

       #include <gnutls/gnutls.h>

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

       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

       Sets  priorities	 for  the ciphers, key exchange methods, macs and com‐
       pression methods.

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

       Unless there is a special need, use the "NORMAL"	 keyword  to  apply  a
       reasonable security level, or "NORMAL:COMPAT" for compatibility.

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

       "LEGACY" the NORMAL settings for GnuTLS 3.2.x or earlier. There	is  no
       verification profile set, and the allowed DH primes are considered weak

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

       "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 com‐
       pression methods.

       " KEYWORD " The system administrator  imposed  settings.	 The  provided
       keywords	 will  be  expanded  from a configuration-time provided file -
       default is: /etc/gnutls/default-priorities. Any	keywords  that	follow
       it,  will  be  appended	to  the expanded string. If there is no system
       string, then the function will fail. The system file should be  format‐
       ted as "KEYWORD=VALUE", e.g., "SYSTEM=NORMAL:-ARCFOUR-128".

       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 infor‐


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

       "SECURE128:-VERS-SSL3.0:+COMP-DEFLATE" means that only  secure  ciphers
       are enabled, SSL3.0 is disabled, and libz compression enabled.




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

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

       Report bugs to <>.
       Home page:

       Copyright © 2001-2014 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.

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

gnutls				     3.3.1	       gnutls_priority_init(3)

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