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131 .IX Title "SSL_GET_CIPHERS 3"
132 .TH SSL_GET_CIPHERS 3 "2018-11-20" "1.1.1a" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
134 .\" way too many mistakes in technical documents.
138 SSL_get1_supported_ciphers, SSL_get_client_ciphers, SSL_get_ciphers, SSL_CTX_get_ciphers, SSL_bytes_to_cipher_list, SSL_get_cipher_list, SSL_get_shared_ciphers \&\- get list of available SSL_CIPHERs
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/ssl.h>
144 \& STACK_OF(SSL_CIPHER) *SSL_get_ciphers(const SSL *ssl);
145 \& STACK_OF(SSL_CIPHER) *SSL_CTX_get_ciphers(const SSL_CTX *ctx);
146 \& STACK_OF(SSL_CIPHER) *SSL_get1_supported_ciphers(SSL *s);
147 \& STACK_OF(SSL_CIPHER) *SSL_get_client_ciphers(const SSL *ssl);
148 \& int SSL_bytes_to_cipher_list(SSL *s, const unsigned char *bytes, size_t len,
149 \& int isv2format, STACK_OF(SSL_CIPHER) **sk,
150 \& STACK_OF(SSL_CIPHER) **scsvs);
151 \& const char *SSL_get_cipher_list(const SSL *ssl, int priority);
152 \& char *SSL_get_shared_ciphers(const SSL *s, char *buf, int size);
155 .IX Header "DESCRIPTION"
156 \&\fISSL_get_ciphers()\fR returns the stack of available SSL_CIPHERs for \fBssl\fR,
157 sorted by preference. If \fBssl\fR is \s-1NULL\s0 or no ciphers are available, \s-1NULL\s0
160 \&\fISSL_CTX_get_ciphers()\fR returns the stack of available SSL_CIPHERs for \fBctx\fR.
162 \&\fISSL_get1_supported_ciphers()\fR returns the stack of enabled SSL_CIPHERs for
163 \&\fBssl\fR as would be sent in a ClientHello (that is, sorted by preference).
164 The list depends on settings like the cipher list, the supported protocol
165 versions, the security level, and the enabled signature algorithms.
166 \&\s-1SRP\s0 and \s-1PSK\s0 ciphers are only enabled if the appropriate callbacks or settings
168 The list of ciphers that would be sent in a ClientHello can differ from
169 the list of ciphers that would be acceptable when acting as a server.
170 For example, additional ciphers may be usable by a server if there is
171 a gap in the list of supported protocols, and some ciphers may not be
172 usable by a server if there is not a suitable certificate configured.
173 If \fBssl\fR is \s-1NULL\s0 or no ciphers are available, \s-1NULL\s0 is returned.
175 \&\fISSL_get_client_ciphers()\fR returns the stack of available SSL_CIPHERs matching the
176 list received from the client on \fBssl\fR. If \fBssl\fR is \s-1NULL,\s0 no ciphers are
177 available, or \fBssl\fR is not operating in server mode, \s-1NULL\s0 is returned.
179 \&\fISSL_bytes_to_cipher_list()\fR treats the supplied \fBlen\fR octets in \fBbytes\fR
180 as a wire-protocol cipher suite specification (in the three-octet-per-cipher
181 SSLv2 wire format if \fBisv2format\fR is nonzero; otherwise the two-octet
182 SSLv3/TLS wire format), and parses the cipher suites supported by the library
183 into the returned stacks of \s-1SSL_CIPHER\s0 objects sk and Signalling Cipher-Suite
184 Values scsvs. Unsupported cipher suites are ignored. Returns 1 on success
187 \&\fISSL_get_cipher_list()\fR returns a pointer to the name of the \s-1SSL_CIPHER\s0
188 listed for \fBssl\fR with \fBpriority\fR. If \fBssl\fR is \s-1NULL,\s0 no ciphers are
189 available, or there are less ciphers than \fBpriority\fR available, \s-1NULL\s0
192 \&\fISSL_get_shared_ciphers()\fR creates a colon separated and \s-1NUL\s0 terminated list of
193 \&\s-1SSL_CIPHER\s0 names that are available in both the client and the server. \fBbuf\fR is
194 the buffer that should be populated with the list of names and \fBsize\fR is the
195 size of that buffer. A pointer to \fBbuf\fR is returned on success or \s-1NULL\s0 on
196 error. If the supplied buffer is not large enough to contain the complete list
197 of names then a truncated list of names will be returned. Note that just because
198 a ciphersuite is available (i.e. it is configured in the cipher list) and shared
199 by both the client and the server it does not mean that it is enabled (see the
200 description of \fISSL_get1_supported_ciphers()\fR above). This function will return
201 available shared ciphersuites whether or not they are enabled. This is a server
202 side function only and must only be called after the completion of the initial
206 The details of the ciphers obtained by \fISSL_get_ciphers()\fR, \fISSL_CTX_get_ciphers()\fR
207 \&\fISSL_get1_supported_ciphers()\fR and \fISSL_get_client_ciphers()\fR can be obtained using
208 the \fISSL_CIPHER_get_name\fR\|(3) family of functions.
210 Call \fISSL_get_cipher_list()\fR with \fBpriority\fR starting from 0 to obtain the
211 sorted list of available ciphers, until \s-1NULL\s0 is returned.
213 Note: \fISSL_get_ciphers()\fR, \fISSL_CTX_get_ciphers()\fR and \fISSL_get_client_ciphers()\fR
214 return a pointer to an internal cipher stack, which will be freed later on when
215 the \s-1SSL\s0 or \s-1SSL_SESSION\s0 object is freed. Therefore, the calling code \fB\s-1MUST NOT\s0\fR
216 free the return value itself.
218 The stack returned by \fISSL_get1_supported_ciphers()\fR should be freed using
219 \&\fIsk_SSL_CIPHER_free()\fR.
221 The stacks returned by \fISSL_bytes_to_cipher_list()\fR should be freed using
222 \&\fIsk_SSL_CIPHER_free()\fR.
224 .IX Header "RETURN VALUES"
225 See \s-1DESCRIPTION\s0
227 .IX Header "SEE ALSO"
228 \&\fIssl\fR\|(7), \fISSL_CTX_set_cipher_list\fR\|(3),
229 \&\fISSL_CIPHER_get_name\fR\|(3)
231 .IX Header "COPYRIGHT"
232 Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved.
234 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
235 this file except in compliance with the License. You can obtain a copy
236 in the file \s-1LICENSE\s0 in the source distribution or at
237 <https://www.openssl.org/source/license.html>.