a9c0d8beea
"Early callback" is a little ambiguous now that early data exists. Perhaps "ClientHello callback"? Reviewed-by: Rich Salz <rsalz@openssl.org> Reviewed-by: Ben Kaduk <kaduk@mit.edu> (Merged from https://github.com/openssl/openssl/pull/4349)
183 lines
6.4 KiB
Text
183 lines
6.4 KiB
Text
=pod
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=head1 NAME
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SSL_CIPHER_get_name,
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SSL_CIPHER_standard_name,
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OPENSSL_cipher_name,
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SSL_CIPHER_get_bits,
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SSL_CIPHER_get_version,
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SSL_CIPHER_description,
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SSL_CIPHER_get_cipher_nid,
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SSL_CIPHER_get_digest_nid,
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SSL_CIPHER_get_handshake_digest,
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SSL_CIPHER_get_kx_nid,
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SSL_CIPHER_get_auth_nid,
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SSL_CIPHER_is_aead,
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SSL_CIPHER_find,
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SSL_CIPHER_get_id,
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SSL_CIPHER_get_protocol_id
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- get SSL_CIPHER properties
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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const char *SSL_CIPHER_get_name(const SSL_CIPHER *cipher);
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const char *SSL_CIPHER_standard_name(const SSL_CIPHER *cipher);
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const char *OPENSSL_cipher_name(const char *stdname);
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int SSL_CIPHER_get_bits(const SSL_CIPHER *cipher, int *alg_bits);
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char *SSL_CIPHER_get_version(const SSL_CIPHER *cipher);
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char *SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int size);
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int SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c);
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int SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c);
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const EVP_MD *SSL_CIPHER_get_handshake_digest(const SSL_CIPHER *c);
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int SSL_CIPHER_get_kx_nid(const SSL_CIPHER *c);
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int SSL_CIPHER_get_auth_nid(const SSL_CIPHER *c);
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int SSL_CIPHER_is_aead(const SSL_CIPHER *c);
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const SSL_CIPHER *SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr);
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uint32_t SSL_CIPHER_get_id(const SSL_CIPHER *c);
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uint32_t SSL_CIPHER_get_protocol_id(const SSL_CIPHER *c);
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=head1 DESCRIPTION
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SSL_CIPHER_get_name() returns a pointer to the name of B<cipher>. If the
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B<cipher> is NULL, it returns "(NONE)".
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SSL_CIPHER_standard_name() returns a pointer to the standard RFC name of
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B<cipher>. If the B<cipher> is NULL, it returns "(NONE)". If the B<cipher>
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has no standard name, it returns B<NULL>. If B<cipher> was defined in both
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SSLv3 and TLS, it returns the TLS name.
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OPENSSL_cipher_name() returns a pointer to the OpenSSL name of B<stdname>.
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If the B<stdname> is NULL, or B<stdname> has no corresponding OpenSSL name,
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it returns "(NONE)". Where both exist, B<stdname> should be the TLS name rather
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than the SSLv3 name.
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SSL_CIPHER_get_bits() returns the number of secret bits used for B<cipher>.
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If B<cipher> is NULL, 0 is returned.
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SSL_CIPHER_get_version() returns string which indicates the SSL/TLS protocol
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version that first defined the cipher. It returns "(NONE)" if B<cipher> is NULL.
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SSL_CIPHER_get_cipher_nid() returns the cipher NID corresponding to B<c>.
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If there is no cipher (e.g. for cipher suites with no encryption) then
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B<NID_undef> is returned.
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SSL_CIPHER_get_digest_nid() returns the digest NID corresponding to the MAC
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used by B<c> during record encryption/decryption. If there is no digest (e.g.
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for AEAD cipher suites) then B<NID_undef> is returned.
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SSL_CIPHER_get_handshake_digest() returns an EVP_MD for the digest used during
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the SSL/TLS handshake when using the SSL_CIPHER B<c>. Note that this may be
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different to the digest used to calculate the MAC for encrypted records.
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SSL_CIPHER_get_kx_nid() returns the key exchange NID corresponding to the method
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used by B<c>. If there is no key exchange, then B<NID_undef> is returned.
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If any appropriate key exchange algorithm can be used (as in the case of TLS 1.3
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cipher suites) B<NID_kx_any> is returned. Examples (not comprehensive):
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NID_kx_rsa
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NID_kx_ecdhe
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NID_kx_dhe
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NID_kx_psk
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SSL_CIPHER_get_auth_nid() returns the authentication NID corresponding to the method
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used by B<c>. If there is no authentication, then B<NID_undef> is returned.
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If any appropriate authentication algorithm can be used (as in the case of
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TLS 1.3 cipher suites) B<NID_auth_any> is returned. Examples (not comprehensive):
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NID_auth_rsa
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NID_auth_ecdsa
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NID_auth_psk
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SSL_CIPHER_is_aead() returns 1 if the cipher B<c> is AEAD (e.g. GCM or
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ChaCha20/Poly1305), and 0 if it is not AEAD.
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SSL_CIPHER_find() returns a B<SSL_CIPHER> structure which has the cipher ID stored
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in B<ptr>. The B<ptr> parameter is a two element array of B<char>, which stores the
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two-byte TLS cipher ID (as allocated by IANA) in network byte order. This parameter
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is usually retrieved from a TLS packet by using functions like
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L<SSL_client_hello_get0_ciphers(3)>. SSL_CIPHER_find() returns NULL if an
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error occurs or the indicated cipher is not found.
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SSL_CIPHER_get_id() returns the OpenSSL-specific ID of the given cipher B<c>. That ID is
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not the same as the IANA-specific ID.
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SSL_CIPHER_get_protocol_id() returns the two-byte ID used in the TLS protocol of the given
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cipher B<c>.
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SSL_CIPHER_description() returns a textual description of the cipher used
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into the buffer B<buf> of length B<len> provided. If B<buf> is provided, it
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must be at least 128 bytes, otherwise a buffer will be allocated using
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OPENSSL_malloc(). If the provided buffer is too small, or the allocation fails,
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B<NULL> is returned.
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The string returned by SSL_CIPHER_description() consists of several fields
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separated by whitespace:
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=over 4
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=item <ciphername>
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Textual representation of the cipher name.
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=item <protocol version>
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Protocol version, such as B<TLSv1.2>, when the cipher was first defined.
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=item Kx=<key exchange>
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Key exchange method such as B<RSA>, B<ECDHE>, etc.
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=item Au=<authentication>
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Authentication method such as B<RSA>, B<None>, etc.. None is the
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representation of anonymous ciphers.
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=item Enc=<symmetric encryption method>
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Encryption method, with number of secret bits, such as B<AESGCM(128)>.
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=item Mac=<message authentication code>
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Message digest, such as B<SHA256>.
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=back
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Some examples for the output of SSL_CIPHER_description():
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ECDHE-RSA-AES256-GCM-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(256) Mac=AEAD
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RSA-PSK-AES256-CBC-SHA384 TLSv1.0 Kx=RSAPSK Au=RSA Enc=AES(256) Mac=SHA384
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=head1 HISTORY
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SSL_CIPHER_get_version() was updated to always return the correct protocol
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string in OpenSSL 1.1.0.
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SSL_CIPHER_description() was changed to return B<NULL> on error,
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rather than a fixed string, in OpenSSL 1.1.0.
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SSL_CIPHER_get_handshake_digest() was added in OpenSSL 1.1.1.
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SSL_CIPHER_standard_name() was globally available in OpenSSL 1.1.1. Before
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OpenSSL 1.1.1, tracing (B<enable-ssl-trace> argument to Configure) was
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required to enable this function.
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OPENSSL_cipher_name() was added in OpenSSL 1.1.1.
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=head1 SEE ALSO
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L<ssl(7)>, L<SSL_get_current_cipher(3)>,
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L<SSL_get_ciphers(3)>, L<ciphers(1)>
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=head1 COPYRIGHT
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Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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