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The existing function SSL_get_current_cipher() queries the current session for the ciphersuite in use, but there is no way for application code to determine what ciphersuite has been negotiated and will be used in the future, prior to ChangeCipherState (or the TLS 1.3 equivalent) causing the new cipher to take effect and become visible in the session information. Expose this information to appropriate application callbacks to use during the handshake. The name SSL_get_pending_cipher() was chosen for compatibility with BoringSSL's routine of that name. Improve the note on macro implementations in SSL_get_current_cipher.pod while here. Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4070)
72 lines
2.4 KiB
Plaintext
72 lines
2.4 KiB
Plaintext
=pod
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=head1 NAME
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SSL_get_current_cipher, SSL_get_cipher_name, SSL_get_cipher,
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SSL_get_cipher_bits, SSL_get_cipher_version,
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SSL_get_pending_cipher - get SSL_CIPHER of a connection
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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SSL_CIPHER *SSL_get_current_cipher(const SSL *ssl);
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SSL_CIPHER *SSL_get_pending_cipher(const SSL *ssl);
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const char *SSL_get_cipher_name(const SSL *s);
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const char *SSL_get_cipher(const SSL *s);
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int SSL_get_cipher_bits(const SSL *s, int *np) \
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const char *SSL_get_cipher_version(const SSL *s);
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=head1 DESCRIPTION
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SSL_get_current_cipher() returns a pointer to an SSL_CIPHER object containing
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the description of the actually used cipher of a connection established with
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the B<ssl> object.
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See L<SSL_CIPHER_get_name(3)> for more details.
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SSL_get_cipher_name() obtains the
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name of the currently used cipher.
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SSL_get_cipher() is identical to SSL_get_cipher_name().
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SSL_get_cipher_bits() is a
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macro to obtain the number of secret/algorithm bits used and
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SSL_get_cipher_version() returns the protocol name.
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SSL_get_pending_cipher() returns a pointer to an SSL_CIPHER object containing
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the description of the cipher (if any) that has been negotiated for future use
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on the connection established with the B<ssl> object, but is not yet in use.
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This may be the case during handshake processing, when control flow can be
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returned to the application via any of several callback methods. The internal
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sequencing of handshake processing and callback invocation is not guaranteed
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to be stable from release to release, and at present only the callback set
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by SSL_CTX_set_alpn_select_cb() is guaranteed to have a non-NULL return value.
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Other callbacks may be added to this list over time.
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=head1 RETURN VALUES
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SSL_get_current_cipher() returns the cipher actually used, or NULL if
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no session has been established.
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SSL_get_pending_cipher() returns the cipher to be used at the next change
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of cipher suite, or NULL if no such cipher is known.
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=head1 NOTES
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SSL_get_cipher, SSL_get_cipher_bits, SSL_get_cipher_version, and
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SSL_get_cipher_name are implemented as macros.
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=head1 SEE ALSO
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L<ssl(7)>, L<SSL_CIPHER_get_name(3)>
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=head1 COPYRIGHT
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Copyright 2000-2016 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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