SSL_CIPHER_get_name, SSL_CIPHER_get_bits, SSL_CIPHER_get_version,
SSL_CIPHER_description - get SSL_CIPHER properties
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);
returns a pointer to the name of cipher
the argument is the NULL pointer, a pointer to the constant value
"NONE" is returned.
returns the number of secret bits used for
. If alg_bits
is not NULL, it contains the number of bits
processed by the chosen algorithm. If cipher
is NULL, 0 is returned.
returns string which indicates the SSL/TLS
protocol version that first defined the cipher. This is currently SSLv2
. In some cases it should possibly return
"TLSv1.2" but does not; use SSL_CIPHER_description()
is NULL, "(NONE)" is returned.
returns a textual description of the cipher used
into the buffer buf
of length len
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.
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
- Textual representation of the cipher name.
- <protocol version>
- Protocol version: SSLv2, SSLv3, TLSv1.2. The TLSv1.0
ciphers are flagged with SSLv3. No new ciphers were added by TLSv1.1.
- 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.
- 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.
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
A comp[lete list can be retrieved by invoking the following command:
openssl ciphers -v ALL
is called with cipher
being NULL, the
cannot handle a built-in cipher, the
according description of the cipher property is unknown
. This case
should not occur.