SSL_CIPHER_get_name, SSL_CIPHER_get_bits, SSL_CIPHER_get_version, SSL_CIPHER_description -- get SSL_CIPHER properties
Synopsis
#include <openssl/ssl.h>
const char *SSL_CIPHER_get_name(const SSL_CIPHER *cipher);
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);
DESCRIPTION
SSL_CIPHER_get_name() returns a pointer to the name of cipher. If the argument is the NULL pointer, a
pointer to the constant value "NONE" is returned.
SSL_CIPHER_get_bits() returns the number of secret bits used for
cipher. If alg_bits is not NULL, it contains the number
of bits processed by the chosen algorithm. If cipher is NULL, 0 is returned.
SSL_CIPHER_get_version() returns the protocol version for cipher, currently "SSLv2", "SSLv3", or
"TLSv1". If cipher is NULL, "(NONE)"
is returned.
SSL_CIPHER_description() returns a textual description of the cipher
used into the buffer buf of length
len provided. len must be at least 128 bytes, otherwise a
pointer to the string "Buffer too small" is returned. If buf is NULL, a buffer of 128 bytes is
allocated using OPENSSL_malloc(). If the allocation fails, a pointer
to the string "OPENSSL_malloc Error" is returned.
NOTES
The number of bits processed can be different from the secret bits.
An export cipher like e.g. EXP-RC4-MD5 has only 40 secret bits. The
algorithm does use the full 128 bits (which would be returned for
alg_bits), of which however 88bits
are fixed. The search space is hence only 40 bits.
The string returned by SSL_CIPHER_description() in case of success
consists of cleartext information separated by one or more blanks in
the following sequence:
<ciphername>
Textual representation of the cipher name.
<protocol version>
Protocol version: SSLv2,
SSLv3. The TLSv1 ciphers are
flagged with SSLv3.
Kx=<key exchange>
Key exchange method: RSA
(for export ciphers as RSA(512) or RSA(1024)), DH (for export ciphers as DH(512) or DH(1024)), DH/RSA, DH/DSS, Fortezza.
Au=<authentication>
Authentication method: RSA,
DSS, DH, None. None is the representation of
anonymous ciphers.
Enc=<symmetric encryption method>
Encryption method with number of secret bits: DES(40), DES(56), 3DES(168), RC4(40), RC4(56), RC4(64), RC4(128), RC2(40), RC2(56), RC2(128), IDEA(128), Fortezza, None.
Mac=<message authentication code>
Message digest: MD5,
SHA1.
<export flag>
If the cipher is flagged exportable with respect to old US
crypto regulations, the word "export" is printed.
EXAMPLES
Some examples for the output of SSL_CIPHER_description():
