Provided by: libssl-doc_1.0.1-4ubuntu3_all bug


       SSL_CIPHER_get_name, SSL_CIPHER_get_bits, SSL_CIPHER_get_version, SSL_CIPHER_description -
       get SSL_CIPHER properties


        #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);


       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.


       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:

           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.

           Authentication method: RSA, DSS, DH, None. None is the representation of anonymous

       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


       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.




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