Update files for OpenSSL-1.0.0f import.
[dragonfly.git] / secure / lib / libssl / man / SSL_CTX_set_cipher_list.3
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124.\" ========================================================================
125.\"
126.IX Title "SSL_CTX_set_cipher_list 3"
e3261593 127.TH SSL_CTX_set_cipher_list 3 "2012-01-04" "1.0.0f" "OpenSSL"
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128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
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131.nh
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132.SH "NAME"
133SSL_CTX_set_cipher_list, SSL_set_cipher_list \- choose list of available SSL_CIPHERs
134.SH "SYNOPSIS"
e056f0e0 135.IX Header "SYNOPSIS"
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136.Vb 1
137\& #include <openssl/ssl.h>
e257b235 138\&
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139\& int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str);
140\& int SSL_set_cipher_list(SSL *ssl, const char *str);
141.Ve
142.SH "DESCRIPTION"
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143.IX Header "DESCRIPTION"
144\&\fISSL_CTX_set_cipher_list()\fR sets the list of available ciphers for \fBctx\fR
984263bc 145using the control string \fBstr\fR. The format of the string is described
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146in \fIciphers\fR\|(1). The list of ciphers is inherited by all
147\&\fBssl\fR objects created from \fBctx\fR.
984263bc 148.PP
e056f0e0 149\&\fISSL_set_cipher_list()\fR sets the list of ciphers only for \fBssl\fR.
984263bc 150.SH "NOTES"
e056f0e0 151.IX Header "NOTES"
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152The control string \fBstr\fR should be universally usable and not depend
153on details of the library configuration (ciphers compiled in). Thus no
154syntax checking takes place. Items that are not recognized, because the
155corresponding ciphers are not compiled in or because they are mistyped,
156are simply ignored. Failure is only flagged if no ciphers could be collected
157at all.
158.PP
159It should be noted, that inclusion of a cipher to be used into the list is
160a necessary condition. On the client side, the inclusion into the list is
161also sufficient. On the server side, additional restrictions apply. All ciphers
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162have additional requirements. \s-1ADH\s0 ciphers don't need a certificate, but
163DH-parameters must have been set. All other ciphers need a corresponding
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164certificate and key.
165.PP
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166A \s-1RSA\s0 cipher can only be chosen, when a \s-1RSA\s0 certificate is available.
167\&\s-1RSA\s0 export ciphers with a keylength of 512 bits for the \s-1RSA\s0 key require
168a temporary 512 bit \s-1RSA\s0 key, as typically the supplied key has a length
984263bc 169of 1024 bit (see
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170\&\fISSL_CTX_set_tmp_rsa_callback\fR\|(3)).
171\&\s-1RSA\s0 ciphers using \s-1EDH\s0 need a certificate and key and additional DH-parameters
172(see \fISSL_CTX_set_tmp_dh_callback\fR\|(3)).
984263bc 173.PP
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174A \s-1DSA\s0 cipher can only be chosen, when a \s-1DSA\s0 certificate is available.
175\&\s-1DSA\s0 ciphers always use \s-1DH\s0 key exchange and therefore need DH-parameters
176(see \fISSL_CTX_set_tmp_dh_callback\fR\|(3)).
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177.PP
178When these conditions are not met for any cipher in the list (e.g. a
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179client only supports export \s-1RSA\s0 ciphers with a asymmetric key length
180of 512 bits and the server is not configured to use temporary \s-1RSA\s0
181keys), the \*(L"no shared cipher\*(R" (\s-1SSL_R_NO_SHARED_CIPHER\s0) error is generated
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182and the handshake will fail.
183.SH "RETURN VALUES"
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184.IX Header "RETURN VALUES"
185\&\fISSL_CTX_set_cipher_list()\fR and \fISSL_set_cipher_list()\fR return 1 if any cipher
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186could be selected and 0 on complete failure.
187.SH "SEE ALSO"
a7d27d5a 188.IX Header "SEE ALSO"
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189\&\fIssl\fR\|(3), \fISSL_get_ciphers\fR\|(3),
190\&\fISSL_CTX_use_certificate\fR\|(3),
191\&\fISSL_CTX_set_tmp_rsa_callback\fR\|(3),
192\&\fISSL_CTX_set_tmp_dh_callback\fR\|(3),
193\&\fIciphers\fR\|(1)