1=pod
2
3=head1 NAME
4
5SSL_CIPHER_get_name, SSL_CIPHER_get_bits, SSL_CIPHER_get_version, SSL_CIPHER_description - get SSL_CIPHER properties
6
7=head1 SYNOPSIS
8
9 #include <openssl/ssl.h>
10
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
16=head1 DESCRIPTION
17
18SSL_CIPHER_get_name() returns a pointer to the name of B<cipher>. If the
19argument is the NULL pointer, a pointer to the constant value "NONE" is
20returned.
21
22SSL_CIPHER_get_bits() returns the number of secret bits used for B<cipher>. If
23B<alg_bits> is not NULL, it contains the number of bits processed by the
24chosen algorithm. If B<cipher> is NULL, 0 is returned.
25
26SSL_CIPHER_get_version() returns the protocol version for B<cipher>, currently
27"SSLv2", "SSLv3", or "TLSv1". If B<cipher> is NULL, "(NONE)" is returned.
28
29SSL_CIPHER_description() returns a textual description of the cipher used
30into the buffer B<buf> of length B<len> provided. B<len> must be at least
31128 bytes, otherwise a pointer to the string "Buffer too small" is
32returned. If B<buf> is NULL, a buffer of 128 bytes is allocated using
33OPENSSL_malloc(). If the allocation fails, a pointer to the string
34"OPENSSL_malloc Error" is returned.
35
36=head1 NOTES
37
38The number of bits processed can be different from the secret bits. An
39export cipher like e.g. EXP-RC4-MD5 has only 40 secret bits. The algorithm
40does use the full 128 bits (which would be returned for B<alg_bits>), of
41which however 88bits are fixed. The search space is hence only 40 bits.
42
43The string returned by SSL_CIPHER_description() in case of success consists
44of cleartext information separated by one or more blanks in the following
45sequence:
46
47=over 4
48
49=item <ciphername>
50
51Textual representation of the cipher name.
52
53=item <protocol version>
54
55Protocol version: B<SSLv2>, B<SSLv3>. The TLSv1 ciphers are flagged with SSLv3.
56
57=item Kx=<key exchange>
58
59Key exchange method: B<RSA> (for export ciphers as B<RSA(512)> or
60B<RSA(1024)>), B<DH> (for export ciphers as B<DH(512)> or B<DH(1024)>),
61B<DH/RSA>, B<DH/DSS>, B<Fortezza>.
62
63=item Au=<authentication>
64
65Authentication method: B<RSA>, B<DSS>, B<DH>, B<None>. None is the
66representation of anonymous ciphers.
67
68=item Enc=<symmetric encryption method>
69
70Encryption method with number of secret bits: B<DES(40)>, B<DES(56)>,
71B<3DES(168)>, B<RC4(40)>, B<RC4(56)>, B<RC4(64)>, B<RC4(128)>,
72B<RC2(40)>, B<RC2(56)>, B<RC2(128)>, B<IDEA(128)>, B<Fortezza>, B<None>.
73
74=item Mac=<message authentication code>
75
76Message digest: B<MD5>, B<SHA1>.
77
78=item <export flag>
79
80If the cipher is flagged exportable with respect to old US crypto
81regulations, the word "B<export>" is printed.
82
83=back
84
85=head1 EXAMPLES
86
87Some examples for the output of SSL_CIPHER_description():
88
89 EDH-RSA-DES-CBC3-SHA    SSLv3 Kx=DH       Au=RSA  Enc=3DES(168) Mac=SHA1
90 EDH-DSS-DES-CBC3-SHA    SSLv3 Kx=DH       Au=DSS  Enc=3DES(168) Mac=SHA1
91 RC4-MD5                 SSLv3 Kx=RSA      Au=RSA  Enc=RC4(128)  Mac=MD5
92 EXP-RC4-MD5             SSLv3 Kx=RSA(512) Au=RSA  Enc=RC4(40)   Mac=MD5  export
93
94=head1 BUGS
95
96If SSL_CIPHER_description() is called with B<cipher> being NULL, the
97library crashes.
98
99If SSL_CIPHER_description() cannot handle a built-in cipher, the according
100description of the cipher property is B<unknown>. This case should not
101occur.
102
103=head1 RETURN VALUES
104
105See DESCRIPTION
106
107=head1 SEE ALSO
108
109L<ssl(3)|ssl(3)>, L<SSL_get_current_cipher(3)|SSL_get_current_cipher(3)>,
110L<SSL_get_ciphers(3)|SSL_get_ciphers(3)>, L<ciphers(1)|ciphers(1)>
111
112=cut
113