gnutls_priority_init man page on Cygwin
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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. 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 mar‐
gin.
"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.
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‐
mation.
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.
"SECURE128:-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 © 2001-2013 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 3.2.4 gnutls_priority_init(3)
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