mirror of
https://github.com/openssl/openssl.git
synced 2024-12-03 05:41:46 +08:00
baf245ec5f
Fix the docs, and refactor some common code. Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
94 lines
2.8 KiB
Plaintext
94 lines
2.8 KiB
Plaintext
=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(const SSL_CIPHER *cipher, char *buf, int size);
|
|
int SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c);
|
|
int SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
SSL_CIPHER_get_name() returns a pointer to the name of B<cipher>. If the
|
|
B<cipher> is NULL, it returns "(NONE)".
|
|
|
|
SSL_CIPHER_get_bits() returns the number of secret bits used for B<cipher>.
|
|
If B<cipher> is NULL, 0 is returned.
|
|
|
|
SSL_CIPHER_get_version() returns string which indicates the SSL/TLS protocol
|
|
version that first defined the cipher. It returns "(NONE)" if B<cipher> is NULL.
|
|
|
|
SSL_CIPHER_get_cipher_nid() returns the cipher NID corresponding to B<c>.
|
|
If there is no cipher (e.g. for ciphersuites with no encryption) then
|
|
B<NID_undef> is returned.
|
|
|
|
SSL_CIPHER_get_digest_nid() returns the digest NID corresponding to the MAC
|
|
used by B<c>. If there is no digest (e.g. for AEAD ciphersuites) then
|
|
B<NID_undef> is returned.
|
|
|
|
SSL_CIPHER_description() returns a textual description of the cipher used
|
|
into the buffer B<buf> of length B<len> provided. If B<buf> is provided, it
|
|
must be at least 128 bytes, otherwise a buffer will be allocated using
|
|
OPENSSL_malloc(). If the provided buffer is too small, or the allocation fails,
|
|
B<NULL> is returned.
|
|
|
|
The string returned by SSL_CIPHER_description() consists of several fields
|
|
separated by whitespace:
|
|
|
|
=over 4
|
|
|
|
=item <ciphername>
|
|
|
|
Textual representation of the cipher name.
|
|
|
|
=item <protocol version>
|
|
|
|
Protocol version, such as B<TLSv1.2>, when the cipher was first defined.
|
|
|
|
=item Kx=<key exchange>
|
|
|
|
Key exchange method such as B<RSA>, B<ECDHE>, etc.
|
|
|
|
=item Au=<authentication>
|
|
|
|
Authentication method such as B<RSA>, B<None>, etc.. None is the
|
|
representation of anonymous ciphers.
|
|
|
|
=item Enc=<symmetric encryption method>
|
|
|
|
Encryption method, with number of secret bits, such as B<AESGCM(128)>.
|
|
|
|
=item Mac=<message authentication code>
|
|
|
|
Message digest, such as B<SHA256>.
|
|
|
|
=back
|
|
|
|
Some examples for the output of SSL_CIPHER_description():
|
|
|
|
ECDHE-RSA-AES256-GCM-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(256) Mac=AEAD
|
|
RSA-PSK-AES256-CBC-SHA384 TLSv1.0 Kx=RSAPSK Au=RSA Enc=AES(256) Mac=SHA384
|
|
|
|
=head1 HISTORY
|
|
|
|
SSL_CIPHER_get_version() was updated to always return the correct protocol
|
|
string in OpenSSL 1.1.
|
|
|
|
SSL_CIPHER_description() was changed to return B<NULL> on error,
|
|
rather than a fixed string, in OpenSSL 1.1
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ssl(3)>, L<SSL_get_current_cipher(3)>,
|
|
L<SSL_get_ciphers(3)>, L<ciphers(1)>
|
|
|
|
=cut
|