| =pod |
| |
| =head1 NAME |
| |
| SSL_CIPHER_get_name, SSL_CIPHER_get_bits, SSL_CIPHER_get_version, SSL_CIPHER_description - get SSL_CIPHER properties |
| |
| =head1 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); |
| |
| =head1 DESCRIPTION |
| |
| SSL_CIPHER_get_name() returns a pointer to the name of B<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 B<cipher>. If |
| B<alg_bits> is not NULL, it contains the number of bits processed by the |
| chosen algorithm. If B<cipher> is NULL, 0 is returned. |
| |
| SSL_CIPHER_get_version() returns the protocol version for B<cipher>, currently |
| "SSLv2", "SSLv3", or "TLSv1". If B<cipher> is NULL, "(NONE)" is returned. |
| |
| SSL_CIPHER_description() returns a textual description of the cipher used |
| into the buffer B<buf> of length B<len> provided. B<len> must be at least |
| 128 bytes, otherwise a pointer to the the string "Buffer too small" is |
| returned. If B<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. |
| |
| =head1 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 B<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: |
| |
| =over 4 |
| |
| =item <ciphername> |
| |
| Textual representation of the cipher name. |
| |
| =item <protocol version> |
| |
| Protocol version: B<SSLv2>, B<SSLv3>. The TLSv1 ciphers are flagged with SSLv3. |
| |
| =item Kx=<key exchange> |
| |
| Key exchange method: B<RSA> (for export ciphers as B<RSA(512)> or |
| B<RSA(1024)>), B<DH> (for export ciphers as B<DH(512)> or B<DH(1024)>), |
| B<DH/RSA>, B<DH/DSS>, B<Fortezza>. |
| |
| =item Au=<authentication> |
| |
| Authentication method: B<RSA>, B<DSS>, B<DH>, B<None>. None is the |
| representation of anonymous ciphers. |
| |
| =item Enc=<symmetric encryption method> |
| |
| Encryption method with number of secret bits: B<DES(40)>, B<DES(56)>, |
| B<3DES(168)>, B<RC4(40)>, B<RC4(56)>, B<RC4(64)>, B<RC4(128)>, |
| B<RC2(40)>, B<RC2(56)>, B<RC2(128)>, B<IDEA(128)>, B<Fortezza>, B<None>. |
| |
| =item Mac=<message authentication code> |
| |
| Message digest: B<MD5>, B<SHA1>. |
| |
| =item <export flag> |
| |
| If the cipher is flagged exportable with respect to old US crypto |
| regulations, the word "B<export>" is printed. |
| |
| =back |
| |
| =head1 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 |
| |
| =head1 BUGS |
| |
| If SSL_CIPHER_description() is called with B<cipher> being NULL, the |
| library crashes. |
| |
| If SSL_CIPHER_description() cannot handle a built-in cipher, the according |
| description of the cipher property is B<unknown>. This case should not |
| occur. |
| |
| =head1 RETURN VALUES |
| |
| See DESCRIPTION |
| |
| =head1 SEE ALSO |
| |
| L<ssl(3)|ssl(3)>, L<SSL_get_current_cipher(3)|SSL_get_current_cipher(3)>, |
| L<SSL_get_ciphers(3)|SSL_get_ciphers(3)>, L<ciphers(1)|ciphers(1)> |
| |
| =cut |
