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 com- pression methods.

The priorities option allows you to specify a colon separated list of the cipher priorities to enable.

COMMON KEYWORDS Some keywords are defined to provide quick access to common prefer- ences.

"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 mar- gin.

"SECURE128" means all "secure" ciphersuites with ciphers up to 128 bits, sorted by security margin.

"SECURE256" means all "secure" ciphersuites including the 256 bit ciphers, sorted by security margin.

"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.

SPECIAL KEYWORDS "!" 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- mation.


"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.


"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 <>. GnuTLS home page: General help using GNU software:

COPYRIGHT Copyright © 2008 Free Software Foundation. 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.

gnutls gnutls_priority_init(3)