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SSL_bytes_to_cipher_list.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" 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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ssl.h> \& \& STACK_OF(SSL_CIPHER) *SSL_get_ciphers(const SSL *ssl); \& STACK_OF(SSL_CIPHER) *SSL_CTX_get_ciphers(const SSL_CTX *ctx); \& STACK_OF(SSL_CIPHER) *SSL_get1_supported_ciphers(SSL *s); \& STACK_OF(SSL_CIPHER) *SSL_get_client_ciphers(const SSL *ssl); \& int SSL_bytes_to_cipher_list(SSL *s, const unsigned char *bytes, size_t len, \& int isv2format, STACK_OF(SSL_CIPHER) **sk, \& STACK_OF(SSL_CIPHER) **scsvs); \& const char *SSL_get_cipher_list(const SSL *ssl, int priority); \& char *SSL_get_shared_ciphers(const SSL *s, char *buf, int size); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_get_ciphers()\fR returns the stack of available SSL_CIPHERs for \fBssl\fR, sorted by preference. If \fBssl\fR is \s-1NULL\s0 or no ciphers are available, \s-1NULL\s0 is returned. .PP \&\fBSSL_CTX_get_ciphers()\fR returns the stack of available SSL_CIPHERs for \fBctx\fR. .PP \&\fBSSL_get1_supported_ciphers()\fR returns the stack of enabled SSL_CIPHERs for \&\fBssl\fR as would be sent in a ClientHello (that is, sorted by preference). The list depends on settings like the cipher list, the supported protocol versions, the security level, and the enabled signature algorithms. \&\s-1SRP\s0 and \s-1PSK\s0 ciphers are only enabled if the appropriate callbacks or settings have been applied. The list of ciphers that would be sent in a ClientHello can differ from the list of ciphers that would be acceptable when acting as a server. For example, additional ciphers may be usable by a server if there is a gap in the list of supported protocols, and some ciphers may not be usable by a server if there is not a suitable certificate configured. If \fBssl\fR is \s-1NULL\s0 or no ciphers are available, \s-1NULL\s0 is returned. .PP \&\fBSSL_get_client_ciphers()\fR returns the stack of available SSL_CIPHERs matching the list received from the client on \fBssl\fR. If \fBssl\fR is \s-1NULL,\s0 no ciphers are available, or \fBssl\fR is not operating in server mode, \s-1NULL\s0 is returned. .PP \&\fBSSL_bytes_to_cipher_list()\fR treats the supplied \fBlen\fR octets in \fBbytes\fR as a wire-protocol cipher suite specification (in the three-octet-per-cipher SSLv2 wire format if \fBisv2format\fR is nonzero; otherwise the two-octet SSLv3/TLS wire format), and parses the cipher suites supported by the library into the returned stacks of \s-1SSL_CIPHER\s0 objects sk and Signalling Cipher-Suite Values scsvs. Unsupported cipher suites are ignored. Returns 1 on success and 0 on failure. .PP \&\fBSSL_get_cipher_list()\fR returns a pointer to the name of the \s-1SSL_CIPHER\s0 listed for \fBssl\fR with \fBpriority\fR. If \fBssl\fR is \s-1NULL,\s0 no ciphers are available, or there are less ciphers than \fBpriority\fR available, \s-1NULL\s0 is returned. .PP \&\fBSSL_get_shared_ciphers()\fR creates a colon separated and \s-1NUL\s0 terminated list of \&\s-1SSL_CIPHER\s0 names that are available in both the client and the server. \fBbuf\fR is the buffer that should be populated with the list of names and \fBsize\fR is the size of that buffer. A pointer to \fBbuf\fR is returned on success or \s-1NULL\s0 on error. If the supplied buffer is not large enough to contain the complete list of names then a truncated list of names will be returned. Note that just because a ciphersuite is available (i.e. it is configured in the cipher list) and shared by both the client and the server it does not mean that it is enabled (see the description of \fBSSL_get1_supported_ciphers()\fR above). This function will return available shared ciphersuites whether or not they are enabled. This is a server side function only and must only be called after the completion of the initial handshake. .SH "NOTES" .IX Header "NOTES" The details of the ciphers obtained by \fBSSL_get_ciphers()\fR, \fBSSL_CTX_get_ciphers()\fR \&\fBSSL_get1_supported_ciphers()\fR and \fBSSL_get_client_ciphers()\fR can be obtained using the \fBSSL_CIPHER_get_name\fR\|(3) family of functions. .PP Call \fBSSL_get_cipher_list()\fR with \fBpriority\fR starting from 0 to obtain the sorted list of available ciphers, until \s-1NULL\s0 is returned. .PP Note: \fBSSL_get_ciphers()\fR, \fBSSL_CTX_get_ciphers()\fR and \fBSSL_get_client_ciphers()\fR return a pointer to an internal cipher stack, which will be freed later on when the \s-1SSL\s0 or \s-1SSL_SESSION\s0 object is freed. Therefore, the calling code \fB\s-1MUST NOT\s0\fR free the return value itself. .PP The stack returned by \fBSSL_get1_supported_ciphers()\fR should be freed using \&\fBsk_SSL_CIPHER_free()\fR. .PP The stacks returned by \fBSSL_bytes_to_cipher_list()\fR should be freed using \&\fBsk_SSL_CIPHER_free()\fR. .SH "RETURN VALUES" .IX Header "RETURN VALUES" See \s-1DESCRIPTION\s0 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBssl\fR\|(7), \fBSSL_CTX_set_cipher_list\fR\|(3), \&\fBSSL_CIPHER_get_name\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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