Standard preamble:
========================================================================
..
.... Set up some character translations and predefined strings. \*(-- will
give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
double quote, and \*(R" will give a right double quote. \*(C+ will
give a nicer C++. Capital omega is used to do unbreakable dashes and
therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
nothing in troff, for use with C<>.
.tr \(*W- . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\}
Escape single quotes in literal strings from groff's Unicode transform.
If the F register is turned on, we'll generate index entries on stderr for
titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
entries marked with X<> in POD. Of course, you'll have to process the
output yourself in some meaningful fashion.
Avoid warning from groff about undefined register 'F'.
.. .nr rF 0 . if \nF \{ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{ . nr % 0 . nr F 2 . \} . \} .\} .rr rF
Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
Fear. Run. Save yourself. No user-serviceable parts.
. \" fudge factors for nroff and troff . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] .\} . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents . \" corrections for vroff . \" for low resolution devices (crt and lpr) \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} ========================================================================
Title "SSL_CTX_set_cipher_list 3"
way too many mistakes in technical documents.
\fISSL_set_cipher_list() sets the list of ciphers only for ssl.
It should be noted, that inclusion of a cipher to be used into the list is a necessary condition. On the client side, the inclusion into the list is also sufficient. On the server side, additional restrictions apply. All ciphers have additional requirements. \s-1ADH\s0 ciphers don't need a certificate, but DH-parameters must have been set. All other ciphers need a corresponding certificate and key.
A \s-1RSA\s0 cipher can only be chosen, when a \s-1RSA\s0 certificate is available. \s-1RSA\s0 export ciphers with a keylength of 512 bits for the \s-1RSA\s0 key require a temporary 512 bit \s-1RSA\s0 key, as typically the supplied key has a length of 1024 bit (see \fISSL_CTX_set_tmp_rsa_callback\|(3)). \s-1RSA\s0 ciphers using \s-1EDH\s0 need a certificate and key and additional DH-parameters (see SSL_CTX_set_tmp_dh_callback\|(3)).
A \s-1DSA\s0 cipher can only be chosen, when a \s-1DSA\s0 certificate is available. \s-1DSA\s0 ciphers always use \s-1DH\s0 key exchange and therefore need DH-parameters (see SSL_CTX_set_tmp_dh_callback\|(3)).
When these conditions are not met for any cipher in the list (e.g. a client only supports export \s-1RSA\s0 ciphers with a asymmetric key length of 512 bits and the server is not configured to use temporary \s-1RSA\s0 keys), the \*(L"no shared cipher\*(R" (\s-1SSL_R_NO_SHARED_CIPHER\s0) error is generated and the handshake will fail.
If the cipher list does not contain any SSLv2 cipher suites (this is the default) then SSLv2 is effectively disabled and neither clients nor servers will attempt to use SSLv2.