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.\" ========================================================================
.\"
.IX Title "SSL_CIPHER_GET_NAME 3"
.TH SSL_CIPHER_GET_NAME 3 "2019-02-26" "1.1.1b" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
SSL_CIPHER_get_name, SSL_CIPHER_standard_name, OPENSSL_cipher_name, SSL_CIPHER_get_bits, SSL_CIPHER_get_version, SSL_CIPHER_description, SSL_CIPHER_get_cipher_nid, SSL_CIPHER_get_digest_nid, SSL_CIPHER_get_handshake_digest, SSL_CIPHER_get_kx_nid, SSL_CIPHER_get_auth_nid, SSL_CIPHER_is_aead, SSL_CIPHER_find, SSL_CIPHER_get_id, SSL_CIPHER_get_protocol_id \&\- get SSL_CIPHER properties
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& const char *SSL_CIPHER_get_name(const SSL_CIPHER *cipher);
\& const char *SSL_CIPHER_standard_name(const SSL_CIPHER *cipher);
\& const char *OPENSSL_cipher_name(const char *stdname);
\& int SSL_CIPHER_get_bits(const SSL_CIPHER *cipher, int *alg_bits);
\& char *SSL_CIPHER_get_version(const SSL_CIPHER *cipher);
\& char *SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int size);
\& int SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c);
\& int SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c);
\& const EVP_MD *SSL_CIPHER_get_handshake_digest(const SSL_CIPHER *c);
\& int SSL_CIPHER_get_kx_nid(const SSL_CIPHER *c);
\& int SSL_CIPHER_get_auth_nid(const SSL_CIPHER *c);
\& int SSL_CIPHER_is_aead(const SSL_CIPHER *c);
\& const SSL_CIPHER *SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr);
\& uint32_t SSL_CIPHER_get_id(const SSL_CIPHER *c);
\& uint32_t SSL_CIPHER_get_protocol_id(const SSL_CIPHER *c);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_CIPHER_get_name()\fR returns a pointer to the name of \fBcipher\fR. If the
\&\fBcipher\fR is \s-1NULL,\s0 it returns \*(L"(\s-1NONE\s0)\*(R".
.PP
\&\fBSSL_CIPHER_standard_name()\fR returns a pointer to the standard \s-1RFC\s0 name of
\&\fBcipher\fR. If the \fBcipher\fR is \s-1NULL,\s0 it returns \*(L"(\s-1NONE\s0)\*(R". If the \fBcipher\fR
has no standard name, it returns \fB\s-1NULL\s0\fR. If \fBcipher\fR was defined in both
SSLv3 and \s-1TLS,\s0 it returns the \s-1TLS\s0 name.
.PP
\&\fBOPENSSL_cipher_name()\fR returns a pointer to the OpenSSL name of \fBstdname\fR.
If the \fBstdname\fR is \s-1NULL,\s0 or \fBstdname\fR has no corresponding OpenSSL name,
it returns \*(L"(\s-1NONE\s0)\*(R". Where both exist, \fBstdname\fR should be the \s-1TLS\s0 name rather
than the SSLv3 name.
.PP
\&\fBSSL_CIPHER_get_bits()\fR returns the number of secret bits used for \fBcipher\fR.
If \fBcipher\fR is \s-1NULL, 0\s0 is returned.
.PP
\&\fBSSL_CIPHER_get_version()\fR returns string which indicates the \s-1SSL/TLS\s0 protocol
version that first defined the cipher. It returns \*(L"(\s-1NONE\s0)\*(R" if \fBcipher\fR is \s-1NULL.\s0
.PP
\&\fBSSL_CIPHER_get_cipher_nid()\fR returns the cipher \s-1NID\s0 corresponding to \fBc\fR.
If there is no cipher (e.g. for cipher suites with no encryption) then
\&\fBNID_undef\fR is returned.
.PP
\&\fBSSL_CIPHER_get_digest_nid()\fR returns the digest \s-1NID\s0 corresponding to the \s-1MAC\s0
used by \fBc\fR during record encryption/decryption. If there is no digest (e.g.
for \s-1AEAD\s0 cipher suites) then \fBNID_undef\fR is returned.
.PP
\&\fBSSL_CIPHER_get_handshake_digest()\fR returns an \s-1EVP_MD\s0 for the digest used during
the \s-1SSL/TLS\s0 handshake when using the \s-1SSL_CIPHER\s0 \fBc\fR. Note that this may be
different to the digest used to calculate the \s-1MAC\s0 for encrypted records.
.PP
\&\fBSSL_CIPHER_get_kx_nid()\fR returns the key exchange \s-1NID\s0 corresponding to the method
used by \fBc\fR. If there is no key exchange, then \fBNID_undef\fR is returned.
If any appropriate key exchange algorithm can be used (as in the case of \s-1TLS 1.3\s0
cipher suites) \fBNID_kx_any\fR is returned. Examples (not comprehensive):
.PP
.Vb 4
\& NID_kx_rsa
\& NID_kx_ecdhe
\& NID_kx_dhe
\& NID_kx_psk
.Ve
.PP
\&\fBSSL_CIPHER_get_auth_nid()\fR returns the authentication \s-1NID\s0 corresponding to the method
used by \fBc\fR. If there is no authentication, then \fBNID_undef\fR is returned.
If any appropriate authentication algorithm can be used (as in the case of
\&\s-1TLS 1.3\s0 cipher suites) \fBNID_auth_any\fR is returned. Examples (not comprehensive):
.PP
.Vb 3
\& NID_auth_rsa
\& NID_auth_ecdsa
\& NID_auth_psk
.Ve
.PP
\&\fBSSL_CIPHER_is_aead()\fR returns 1 if the cipher \fBc\fR is \s-1AEAD\s0 (e.g. \s-1GCM\s0 or
ChaCha20/Poly1305), and 0 if it is not \s-1AEAD.\s0
.PP
\&\fBSSL_CIPHER_find()\fR returns a \fB\s-1SSL_CIPHER\s0\fR structure which has the cipher \s-1ID\s0 stored
in \fBptr\fR. The \fBptr\fR parameter is a two element array of \fBchar\fR, which stores the
two-byte \s-1TLS\s0 cipher \s-1ID\s0 (as allocated by \s-1IANA\s0) in network byte order. This parameter
is usually retrieved from a \s-1TLS\s0 packet by using functions like
\&\fBSSL_client_hello_get0_ciphers\fR\|(3). \fBSSL_CIPHER_find()\fR returns \s-1NULL\s0 if an
error occurs or the indicated cipher is not found.
.PP
\&\fBSSL_CIPHER_get_id()\fR returns the OpenSSL-specific \s-1ID\s0 of the given cipher \fBc\fR. That \s-1ID\s0 is
not the same as the IANA-specific \s-1ID.\s0
.PP
\&\fBSSL_CIPHER_get_protocol_id()\fR returns the two-byte \s-1ID\s0 used in the \s-1TLS\s0 protocol of the given
cipher \fBc\fR.
.PP
\&\fBSSL_CIPHER_description()\fR returns a textual description of the cipher used
into the buffer \fBbuf\fR of length \fBlen\fR provided. If \fBbuf\fR is provided, it
must be at least 128 bytes, otherwise a buffer will be allocated using
\&\fBOPENSSL_malloc()\fR. If the provided buffer is too small, or the allocation fails,
\&\fB\s-1NULL\s0\fR is returned.
.PP
The string returned by \fBSSL_CIPHER_description()\fR consists of several fields
separated by whitespace:
.IP "<ciphername>" 4
.IX Item "<ciphername>"
Textual representation of the cipher name.
.IP "<protocol version>" 4
.IX Item "<protocol version>"
Protocol version, such as \fBTLSv1.2\fR, when the cipher was first defined.
.IP "Kx=<key exchange>" 4
.IX Item "Kx=<key exchange>"
Key exchange method such as \fB\s-1RSA\s0\fR, \fB\s-1ECDHE\s0\fR, etc.
.IP "Au=<authentication>" 4
.IX Item "Au=<authentication>"
Authentication method such as \fB\s-1RSA\s0\fR, \fBNone\fR, etc.. None is the
representation of anonymous ciphers.
.IP "Enc=<symmetric encryption method>" 4
.IX Item "Enc=<symmetric encryption method>"
Encryption method, with number of secret bits, such as \fB\s-1AESGCM\s0(128)\fR.
.IP "Mac=<message authentication code>" 4
.IX Item "Mac=<message authentication code>"
Message digest, such as \fB\s-1SHA256\s0\fR.
.PP
Some examples for the output of \fBSSL_CIPHER_description()\fR:
.PP
.Vb 2
\& ECDHE\-RSA\-AES256\-GCM\-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(256) Mac=AEAD
\& RSA\-PSK\-AES256\-CBC\-SHA384 TLSv1.0 Kx=RSAPSK Au=RSA Enc=AES(256) Mac=SHA384
.Ve
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBSSL_CIPHER_get_name()\fR, \fBSSL_CIPHER_standard_name()\fR, \fBOPENSSL_cipher_name()\fR,
\&\fBSSL_CIPHER_get_version()\fR and \fBSSL_CIPHER_description()\fR return the corresponding
value in a null-terminated string for a specific cipher or \*(L"(\s-1NONE\s0)\*(R"
if the cipher is not found.
.PP
\&\fBSSL_CIPHER_get_bits()\fR returns a positive integer representing the number of
secret bits or 0 if an error occurred.
.PP
\&\fBSSL_CIPHER_get_cipher_nid()\fR, \fBSSL_CIPHER_get_digest_nid()\fR,
\&\fBSSL_CIPHER_get_kx_nid()\fR and \fBSSL_CIPHER_get_auth_nid()\fR return the \s-1NID\s0 value or
\&\fBNID_undef\fR if an error occurred.
.PP
\&\fBSSL_CIPHER_get_handshake_digest()\fR returns a valid \fB\s-1EVP_MD\s0\fR structure or \s-1NULL\s0
if an error occurred.
.PP
\&\fBSSL_CIPHER_is_aead()\fR returns 1 if the cipher is \s-1AEAD\s0 or 0 otherwise.
.PP
\&\fBSSL_CIPHER_find()\fR returns a valid \fB\s-1SSL_CIPHER\s0\fR structure or \s-1NULL\s0 if an error
occurred.
.PP
\&\fBSSL_CIPHER_get_id()\fR returns a 4\-byte integer representing the OpenSSL-specific \s-1ID.\s0
.PP
\&\fBSSL_CIPHER_get_protocol_id()\fR returns a 2\-byte integer representing the \s-1TLS\s0
protocol-specific \s-1ID.\s0
.SH "HISTORY"
.IX Header "HISTORY"
The \fBSSL_CIPHER_get_version()\fR function was updated to always return the
correct protocol string in OpenSSL 1.1.0.
.PP
The \fBSSL_CIPHER_description()\fR function was changed to return \fB\s-1NULL\s0\fR on error,
rather than a fixed string, in OpenSSL 1.1.0.
.PP
The \fBSSL_CIPHER_get_handshake_digest()\fR function was added in OpenSSL 1.1.1.
.PP
The \fBSSL_CIPHER_standard_name()\fR function was globally available in OpenSSL 1.1.1.
Before OpenSSL 1.1.1, tracing (\fBenable-ssl-trace\fR argument to Configure) was
required to enable this function.
.PP
The \fBOPENSSL_cipher_name()\fR function was added in OpenSSL 1.1.1.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(7), \fBSSL_get_current_cipher\fR\|(3),
\&\fBSSL_get_ciphers\fR\|(3), \fBciphers\fR\|(1)
.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>.