5 SSL_CIPHER_get_name, SSL_CIPHER_get_bits, SSL_CIPHER_get_version, SSL_CIPHER_description - get SSL_CIPHER properties
9 #include <openssl/ssl.h>
11 const char *SSL_CIPHER_get_name(const SSL_CIPHER *cipher);
12 int SSL_CIPHER_get_bits(const SSL_CIPHER *cipher, int *alg_bits);
13 char *SSL_CIPHER_get_version(const SSL_CIPHER *cipher);
14 char *SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int size);
15 int SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c);
16 int SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c);
20 SSL_CIPHER_get_name() returns a pointer to the name of B<cipher>. If the
21 argument is the NULL pointer, a pointer to the constant value "NONE" is
24 SSL_CIPHER_get_bits() returns the number of secret bits used for B<cipher>. If
25 B<alg_bits> is not NULL, it contains the number of bits processed by the
26 chosen algorithm. If B<cipher> is NULL, 0 is returned.
28 SSL_CIPHER_get_version() returns string which indicates the SSL/TLS protocol
29 version that first defined the cipher.
30 This is currently B<TLSv1/SSLv3>.
31 In some cases it should possibly return "TLSv1.2" but does not;
32 use SSL_CIPHER_description() instead.
33 If B<cipher> is NULL, "(NONE)" is returned.
35 SSL_CIPHER_description() returns a textual description of the cipher used
36 into the buffer B<buf> of length B<len> provided. B<len> must be at least
37 128 bytes, otherwise a pointer to the string "Buffer too small" is
38 returned. If B<buf> is NULL, a buffer of 128 bytes is allocated using
39 OPENSSL_malloc(). If the allocation fails, a pointer to the string
40 "OPENSSL_malloc Error" is returned.
42 SSL_CIPHER_get_cipher_nid() returns the cipher NID corresponding to B<c>.
43 If there is no cipher (e.g. for ciphersuites with no encryption) then
44 B<NID_undef> is returned.
46 SSL_CIPHER_get_digest_nid() returns the digest NID corresponding to the MAC
47 used by B<c>. If there is no digest (e.g. for AEAD ciphersuites) then
48 B<NID_undef> is returned.
52 The number of bits processed can be different from the secret bits. An
53 export cipher like e.g. EXP-RC4-MD5 has only 40 secret bits. The algorithm
54 does use the full 128 bits (which would be returned for B<alg_bits>), of
55 which however 88bits are fixed. The search space is hence only 40 bits.
57 The string returned by SSL_CIPHER_description() in case of success consists
58 of cleartext information separated by one or more blanks in the following
65 Textual representation of the cipher name.
67 =item <protocol version>
69 Protocol version: B<SSLv3>, B<TLSv1.2>. The TLSv1.0 ciphers are
70 flagged with SSLv3. No new ciphers were added by TLSv1.1.
72 =item Kx=<key exchange>
74 Key exchange method: B<RSA> (for export ciphers as B<RSA(512)> or
75 B<RSA(1024)>), B<DH> (for export ciphers as B<DH(512)> or B<DH(1024)>),
76 B<DH/RSA>, B<DH/DSS>, B<Fortezza>.
78 =item Au=<authentication>
80 Authentication method: B<RSA>, B<DSS>, B<DH>, B<None>. None is the
81 representation of anonymous ciphers.
83 =item Enc=<symmetric encryption method>
85 Encryption method with number of secret bits: B<DES(40)>, B<DES(56)>,
86 B<3DES(168)>, B<RC4(40)>, B<RC4(56)>, B<RC4(64)>, B<RC4(128)>,
87 B<RC2(40)>, B<RC2(56)>, B<RC2(128)>, B<IDEA(128)>, B<Fortezza>, B<None>.
89 =item Mac=<message authentication code>
91 Message digest: B<MD5>, B<SHA1>.
95 If the cipher is flagged exportable with respect to old US crypto
96 regulations, the word "B<export>" is printed.
102 Some examples for the output of SSL_CIPHER_description():
104 DHE-RSA-DES-CBC3-SHA SSLv3 Kx=DH Au=RSA Enc=3DES(168) Mac=SHA1
105 DHE-DSS-DES-CBC3-SHA SSLv3 Kx=DH Au=DSS Enc=3DES(168) Mac=SHA1
106 RC4-MD5 SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=MD5
107 EXP-RC4-MD5 SSLv3 Kx=RSA(512) Au=RSA Enc=RC4(40) Mac=MD5 export
109 A comp[lete list can be retrieved by invoking the following command:
111 openssl ciphers -v ALL
115 If SSL_CIPHER_description() is called with B<cipher> being NULL, the
118 If SSL_CIPHER_description() cannot handle a built-in cipher, the according
119 description of the cipher property is B<unknown>. This case should not
128 L<ssl(3)|ssl(3)>, L<SSL_get_current_cipher(3)|SSL_get_current_cipher(3)>,
129 L<SSL_get_ciphers(3)|SSL_get_ciphers(3)>, L<ciphers(1)|ciphers(1)>