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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(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 string which indicates the
     SSL/TLS protocol version that first defined the cipher.
     This is currently SSLv2 or TLSv1/SSLv3.  In some cases it
     should possibly return "TLSv1.2" but does not; use
     SSL_CIPHER_description() instead.  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.

1.0.2t               Last change: 2019-09-10                    1

SSL_CIPHER_get_name(3)       OpenSSL       SSL_CIPHER_get_name(3)

     <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.

     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():

      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


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.

     The standard terminology for ephemeral Diffie-Hellman
     schemes is DHE (finite field) or ECDHE (elliptic curve).
     This version of OpenSSL idiosyncratically reports these
     schemes as EDH and EECDH, even though it also accepts the
     standard terminology.

1.0.2t               Last change: 2019-09-10                    2

SSL_CIPHER_get_name(3)       OpenSSL       SSL_CIPHER_get_name(3)

     It is recommended to use the standard terminology (DHE and
     ECDHE) during configuration (e.g. via
     SSL_CTX_set_cipher_list) for clarity of configuration.
     OpenSSL versions after 1.0.2 will report the standard terms
     via SSL_CIPHER_get_name and SSL_CIPHER_description.


RETURN VALUES

     See DESCRIPTION


SEE ALSO

     ssl(3), SSL_get_current_cipher(3), SSL_get_ciphers(3),
     ciphers(1), SSL_CTX_set_cipher_list(3)

1.0.2t               Last change: 2019-09-10                    3

See also SSL_CIPHER_description(3)
See also SSL_CIPHER_get_bits(3)
See also SSL_CIPHER_get_name(3)

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