1SSL_CIPHER_GET_NAME(3)              OpenSSL             SSL_CIPHER_GET_NAME(3)
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NAME

6       SSL_CIPHER_get_name, SSL_CIPHER_standard_name, OPENSSL_cipher_name,
7       SSL_CIPHER_get_bits, SSL_CIPHER_get_version, SSL_CIPHER_description,
8       SSL_CIPHER_get_cipher_nid, SSL_CIPHER_get_digest_nid,
9       SSL_CIPHER_get_handshake_digest, SSL_CIPHER_get_kx_nid,
10       SSL_CIPHER_get_auth_nid, SSL_CIPHER_is_aead, SSL_CIPHER_find,
11       SSL_CIPHER_get_id, SSL_CIPHER_get_protocol_id - get SSL_CIPHER
12       properties
13

SYNOPSIS

15        #include <openssl/ssl.h>
16
17        const char *SSL_CIPHER_get_name(const SSL_CIPHER *cipher);
18        const char *SSL_CIPHER_standard_name(const SSL_CIPHER *cipher);
19        const char *OPENSSL_cipher_name(const char *stdname);
20        int SSL_CIPHER_get_bits(const SSL_CIPHER *cipher, int *alg_bits);
21        char *SSL_CIPHER_get_version(const SSL_CIPHER *cipher);
22        char *SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int size);
23        int SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c);
24        int SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c);
25        const EVP_MD *SSL_CIPHER_get_handshake_digest(const SSL_CIPHER *c);
26        int SSL_CIPHER_get_kx_nid(const SSL_CIPHER *c);
27        int SSL_CIPHER_get_auth_nid(const SSL_CIPHER *c);
28        int SSL_CIPHER_is_aead(const SSL_CIPHER *c);
29        const SSL_CIPHER *SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr);
30        uint32_t SSL_CIPHER_get_id(const SSL_CIPHER *c);
31        uint32_t SSL_CIPHER_get_protocol_id(const SSL_CIPHER *c);
32

DESCRIPTION

34       SSL_CIPHER_get_name() returns a pointer to the name of cipher. If the
35       cipher is NULL, it returns "(NONE)".
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37       SSL_CIPHER_standard_name() returns a pointer to the standard RFC name
38       of cipher. If the cipher is NULL, it returns "(NONE)". If the cipher
39       has no standard name, it returns NULL. If cipher was defined in both
40       SSLv3 and TLS, it returns the TLS name.
41
42       OPENSSL_cipher_name() returns a pointer to the OpenSSL name of stdname.
43       If the stdname is NULL, or stdname has no corresponding OpenSSL name,
44       it returns "(NONE)". Where both exist, stdname should be the TLS name
45       rather than the SSLv3 name.
46
47       SSL_CIPHER_get_bits() returns the number of secret bits used for
48       cipher.  If cipher is NULL, 0 is returned.
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50       SSL_CIPHER_get_version() returns string which indicates the SSL/TLS
51       protocol version that first defined the cipher.  It returns "(NONE)" if
52       cipher is NULL.
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54       SSL_CIPHER_get_cipher_nid() returns the cipher NID corresponding to c.
55       If there is no cipher (e.g. for cipher suites with no encryption) then
56       NID_undef is returned.
57
58       SSL_CIPHER_get_digest_nid() returns the digest NID corresponding to the
59       MAC used by c during record encryption/decryption. If there is no
60       digest (e.g.  for AEAD cipher suites) then NID_undef is returned.
61
62       SSL_CIPHER_get_handshake_digest() returns an EVP_MD for the digest used
63       during the SSL/TLS handshake when using the SSL_CIPHER c. Note that
64       this may be different to the digest used to calculate the MAC for
65       encrypted records.
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67       SSL_CIPHER_get_kx_nid() returns the key exchange NID corresponding to
68       the method used by c. If there is no key exchange, then NID_undef is
69       returned.  If any appropriate key exchange algorithm can be used (as in
70       the case of TLS 1.3 cipher suites) NID_kx_any is returned. Examples
71       (not comprehensive):
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73        NID_kx_rsa
74        NID_kx_ecdhe
75        NID_kx_dhe
76        NID_kx_psk
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78       SSL_CIPHER_get_auth_nid() returns the authentication NID corresponding
79       to the method used by c. If there is no authentication, then NID_undef
80       is returned.  If any appropriate authentication algorithm can be used
81       (as in the case of TLS 1.3 cipher suites) NID_auth_any is returned.
82       Examples (not comprehensive):
83
84        NID_auth_rsa
85        NID_auth_ecdsa
86        NID_auth_psk
87
88       SSL_CIPHER_is_aead() returns 1 if the cipher c is AEAD (e.g. GCM or
89       ChaCha20/Poly1305), and 0 if it is not AEAD.
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91       SSL_CIPHER_find() returns a SSL_CIPHER structure which has the cipher
92       ID stored in ptr. The ptr parameter is a two element array of char,
93       which stores the two-byte TLS cipher ID (as allocated by IANA) in
94       network byte order. This parameter is usually retrieved from a TLS
95       packet by using functions like SSL_client_hello_get0_ciphers(3).
96       SSL_CIPHER_find() returns NULL if an error occurs or the indicated
97       cipher is not found.
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99       SSL_CIPHER_get_id() returns the OpenSSL-specific ID of the given cipher
100       c. That ID is not the same as the IANA-specific ID.
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102       SSL_CIPHER_get_protocol_id() returns the two-byte ID used in the TLS
103       protocol of the given cipher c.
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105       SSL_CIPHER_description() returns a textual description of the cipher
106       used into the buffer buf of length len provided.  If buf is provided,
107       it must be at least 128 bytes, otherwise a buffer will be allocated
108       using OPENSSL_malloc().  If the provided buffer is too small, or the
109       allocation fails, NULL is returned.
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111       The string returned by SSL_CIPHER_description() consists of several
112       fields separated by whitespace:
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114       <ciphername>
115           Textual representation of the cipher name.
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117       <protocol version>
118           Protocol version, such as TLSv1.2, when the cipher was first
119           defined.
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121       Kx=<key exchange>
122           Key exchange method such as RSA, ECDHE, etc.
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124       Au=<authentication>
125           Authentication method such as RSA, None, etc.. None is the
126           representation of anonymous ciphers.
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128       Enc=<symmetric encryption method>
129           Encryption method, with number of secret bits, such as AESGCM(128).
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131       Mac=<message authentication code>
132           Message digest, such as SHA256.
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134       Some examples for the output of SSL_CIPHER_description():
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136        ECDHE-RSA-AES256-GCM-SHA256 TLSv1.2 Kx=ECDH     Au=RSA  Enc=AESGCM(256) Mac=AEAD
137        RSA-PSK-AES256-CBC-SHA384 TLSv1.0 Kx=RSAPSK   Au=RSA  Enc=AES(256)  Mac=SHA384
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RETURN VALUES

140       SSL_CIPHER_get_name(), SSL_CIPHER_standard_name(),
141       OPENSSL_cipher_name(), SSL_CIPHER_get_version() and
142       SSL_CIPHER_description() return the corresponding value in a null-
143       terminated string for a specific cipher or "(NONE)" if the cipher is
144       not found.
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146       SSL_CIPHER_get_bits() returns a positive integer representing the
147       number of secret bits or 0 if an error occurred.
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149       SSL_CIPHER_get_cipher_nid(), SSL_CIPHER_get_digest_nid(),
150       SSL_CIPHER_get_kx_nid() and SSL_CIPHER_get_auth_nid() return the NID
151       value or NID_undef if an error occurred.
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153       SSL_CIPHER_get_handshake_digest() returns a valid EVP_MD structure or
154       NULL if an error occurred.
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156       SSL_CIPHER_is_aead() returns 1 if the cipher is AEAD or 0 otherwise.
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158       SSL_CIPHER_find() returns a valid SSL_CIPHER structure or NULL if an
159       error occurred.
160
161       SSL_CIPHER_get_id() returns a 4-byte integer representing the OpenSSL-
162       specific ID.
163
164       SSL_CIPHER_get_protocol_id() returns a 2-byte integer representing the
165       TLS protocol-specific ID.
166

HISTORY

168       SSL_CIPHER_get_version() was updated to always return the correct
169       protocol string in OpenSSL 1.1.0.
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171       SSL_CIPHER_description() was changed to return NULL on error, rather
172       than a fixed string, in OpenSSL 1.1.0.
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174       SSL_CIPHER_get_handshake_digest() was added in OpenSSL 1.1.1.
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176       SSL_CIPHER_standard_name() was globally available in OpenSSL 1.1.1.
177       Before OpenSSL 1.1.1, tracing (enable-ssl-trace argument to Configure)
178       was required to enable this function.
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180       OPENSSL_cipher_name() was added in OpenSSL 1.1.1.
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SEE ALSO

183       ssl(7), SSL_get_current_cipher(3), SSL_get_ciphers(3), ciphers(1)
184
186       Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
187
188       Licensed under the OpenSSL license (the "License").  You may not use
189       this file except in compliance with the License.  You can obtain a copy
190       in the file LICENSE in the source distribution or at
191       <https://www.openssl.org/source/license.html>.
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1951.1.1                             2018-09-11            SSL_CIPHER_GET_NAME(3)
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