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
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‐
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
"SECURE192" means all "secure" ciphersuites of security level 192-bit
"SUITEB128" means all the NSA SuiteB ciphersuites with security level
"SUITEB192" means all the NSA SuiteB ciphersuites with security level
"EXPORT" means all ciphersuites are enabled, including the low-security
40 bit ciphers.
"NONE" means nothing is enabled. This disables even protocols and com‐
" 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 <firstname.lastname@example.org>.
Home page: http://www.gnutls.org
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.
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gnutls 3.3.1 gnutls_priority_init(3)
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