mirror of
https://github.com/openssl/openssl.git
synced 2024-11-21 01:15:20 +08:00
214 lines
7.7 KiB
Plaintext
214 lines
7.7 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
SSL_CIPHER_get_name,
|
|
SSL_CIPHER_standard_name,
|
|
OPENSSL_cipher_name,
|
|
SSL_CIPHER_get_bits,
|
|
SSL_CIPHER_get_version,
|
|
SSL_CIPHER_description,
|
|
SSL_CIPHER_get_cipher_nid,
|
|
SSL_CIPHER_get_digest_nid,
|
|
SSL_CIPHER_get_handshake_digest,
|
|
SSL_CIPHER_get_kx_nid,
|
|
SSL_CIPHER_get_auth_nid,
|
|
SSL_CIPHER_is_aead,
|
|
SSL_CIPHER_find,
|
|
SSL_CIPHER_get_id,
|
|
SSL_CIPHER_get_protocol_id
|
|
- get SSL_CIPHER properties
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/ssl.h>
|
|
|
|
const char *SSL_CIPHER_get_name(const SSL_CIPHER *cipher);
|
|
const char *SSL_CIPHER_standard_name(const SSL_CIPHER *cipher);
|
|
const char *OPENSSL_cipher_name(const char *stdname);
|
|
int SSL_CIPHER_get_bits(const SSL_CIPHER *cipher, int *alg_bits);
|
|
const 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);
|
|
const EVP_MD *SSL_CIPHER_get_handshake_digest(const SSL_CIPHER *c);
|
|
int SSL_CIPHER_get_kx_nid(const SSL_CIPHER *c);
|
|
int SSL_CIPHER_get_auth_nid(const SSL_CIPHER *c);
|
|
int SSL_CIPHER_is_aead(const SSL_CIPHER *c);
|
|
const SSL_CIPHER *SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr);
|
|
uint32_t SSL_CIPHER_get_id(const SSL_CIPHER *c);
|
|
uint32_t SSL_CIPHER_get_protocol_id(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_standard_name() returns a pointer to the standard RFC name of
|
|
B<cipher>. If the B<cipher> is NULL, it returns "(NONE)". If the B<cipher>
|
|
has no standard name, it returns B<NULL>. If B<cipher> was defined in both
|
|
SSLv3 and TLS, it returns the TLS name.
|
|
|
|
OPENSSL_cipher_name() returns a pointer to the OpenSSL name of B<stdname>.
|
|
If the B<stdname> is NULL, or B<stdname> has no corresponding OpenSSL name,
|
|
it returns "(NONE)". Where both exist, B<stdname> should be the TLS name rather
|
|
than the SSLv3 name.
|
|
|
|
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 cipher suites 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> during record encryption/decryption. If there is no digest (e.g.
|
|
for AEAD cipher suites) then B<NID_undef> is returned.
|
|
|
|
SSL_CIPHER_get_handshake_digest() returns an EVP_MD for the digest used during
|
|
the SSL/TLS handshake when using the SSL_CIPHER B<c>. Note that this may be
|
|
different to the digest used to calculate the MAC for encrypted records.
|
|
|
|
SSL_CIPHER_get_kx_nid() returns the key exchange NID corresponding to the method
|
|
used by B<c>. If there is no key exchange, then B<NID_undef> is returned.
|
|
If any appropriate key exchange algorithm can be used (as in the case of TLS 1.3
|
|
cipher suites) B<NID_kx_any> is returned. Examples (not comprehensive):
|
|
|
|
NID_kx_rsa
|
|
NID_kx_ecdhe
|
|
NID_kx_dhe
|
|
NID_kx_psk
|
|
|
|
SSL_CIPHER_get_auth_nid() returns the authentication NID corresponding to the method
|
|
used by B<c>. If there is no authentication, then B<NID_undef> is returned.
|
|
If any appropriate authentication algorithm can be used (as in the case of
|
|
TLS 1.3 cipher suites) B<NID_auth_any> is returned. Examples (not comprehensive):
|
|
|
|
NID_auth_rsa
|
|
NID_auth_ecdsa
|
|
NID_auth_psk
|
|
|
|
SSL_CIPHER_is_aead() returns 1 if the cipher B<c> is AEAD (e.g. GCM or
|
|
ChaCha20/Poly1305), and 0 if it is not AEAD.
|
|
|
|
SSL_CIPHER_find() returns a B<SSL_CIPHER> structure which has the cipher ID stored
|
|
in B<ptr>. The B<ptr> parameter is a two element array of B<char>, which stores the
|
|
two-byte TLS cipher ID (as allocated by IANA) in network byte order. This parameter
|
|
is usually retrieved from a TLS packet by using functions like
|
|
L<SSL_client_hello_get0_ciphers(3)>. SSL_CIPHER_find() returns NULL if an
|
|
error occurs or the indicated cipher is not found.
|
|
|
|
SSL_CIPHER_get_id() returns the OpenSSL-specific ID of the given cipher B<c>. That ID is
|
|
not the same as the IANA-specific ID.
|
|
|
|
SSL_CIPHER_get_protocol_id() returns the two-byte ID used in the TLS protocol of the given
|
|
cipher B<c>.
|
|
|
|
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. If B<buf> is NULL it 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>
|
|
|
|
The minimum protocol version that the ciphersuite supports, such as B<TLSv1.2>.
|
|
Note that this is not always the same as the protocol version in which the
|
|
ciphersuite was first defined because some ciphersuites are backwards compatible
|
|
with earlier protocol versions.
|
|
|
|
=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 RETURN VALUES
|
|
|
|
SSL_CIPHER_get_name(), SSL_CIPHER_standard_name(), OPENSSL_cipher_name(),
|
|
SSL_CIPHER_get_version() and SSL_CIPHER_description() return the corresponding
|
|
value in a NUL-terminated string for a specific cipher or "(NONE)"
|
|
if the cipher is not found.
|
|
|
|
SSL_CIPHER_get_bits() returns a positive integer representing the number of
|
|
secret bits or 0 if an error occurred.
|
|
|
|
SSL_CIPHER_get_cipher_nid(), SSL_CIPHER_get_digest_nid(),
|
|
SSL_CIPHER_get_kx_nid() and SSL_CIPHER_get_auth_nid() return the NID value or
|
|
B<NID_undef> if an error occurred.
|
|
|
|
SSL_CIPHER_get_handshake_digest() returns a valid B<EVP_MD> structure or NULL
|
|
if an error occurred.
|
|
|
|
SSL_CIPHER_is_aead() returns 1 if the cipher is AEAD or 0 otherwise.
|
|
|
|
SSL_CIPHER_find() returns a valid B<SSL_CIPHER> structure or NULL if an error
|
|
occurred.
|
|
|
|
SSL_CIPHER_get_id() returns a 4-byte integer representing the OpenSSL-specific ID.
|
|
|
|
SSL_CIPHER_get_protocol_id() returns a 2-byte integer representing the TLS
|
|
protocol-specific ID.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ssl(7)>, L<SSL_get_current_cipher(3)>,
|
|
L<SSL_get_ciphers(3)>, L<openssl-ciphers(1)>
|
|
|
|
=head1 HISTORY
|
|
|
|
The SSL_CIPHER_get_version() function was updated to always return the
|
|
correct protocol string in OpenSSL 1.1.0.
|
|
|
|
The SSL_CIPHER_description() function was changed to return B<NULL> on error,
|
|
rather than a fixed string, in OpenSSL 1.1.0.
|
|
|
|
The SSL_CIPHER_get_handshake_digest() function was added in OpenSSL 1.1.1.
|
|
|
|
The SSL_CIPHER_standard_name() function was globally available in OpenSSL 1.1.1.
|
|
Before OpenSSL 1.1.1, tracing (B<enable-ssl-trace> argument to Configure) was
|
|
required to enable this function.
|
|
|
|
The OPENSSL_cipher_name() function was added in OpenSSL 1.1.1.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2024 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|