SSL_CIPHER_get_name(3) OpenSSL SSL_CIPHER_get_name(3)NAME
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(SSL_CIPHER *cipher, char *buf, int size);
DESCRIPTIONSSL_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 pro‐
cessed by the chosen algorithm. If cipher is NULL, 0 is returned.
SSL_CIPHER_get_version() returns the protocol version for cipher, cur‐
rently "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 algo‐
rithm 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 con‐
sists 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 representa‐
tion 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():
EDH-RSA-DES-CBC3-SHA SSLv3 Kx=DH Au=RSA Enc=3DES(168) Mac=SHA1
EDH-DSS-DES-CBC3-SHA SSLv3 Kx=DH Au=DSS Enc=3DES(168) Mac=SHA1
RC4-MD5 SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=MD5
EXP-RC4-MD5 SSLv3 Kx=RSA(512) Au=RSA Enc=RC4(40) Mac=MD5 export
BUGS
If SSL_CIPHER_description() is called with cipher being NULL, the
library crashes.
If SSL_CIPHER_description() cannot handle a built-in cipher, the
according description of the cipher property is unknown. This case
should not occur.
RETURN VALUES
See DESCRIPTION
SEE ALSOssl(3), SSL_get_current_cipher(3), SSL_get_ciphers(3), ciphers(1)0.9.8k 2009-05-20 SSL_CIPHER_get_name(3)
