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82 lines
2.2 KiB
Plaintext
82 lines
2.2 KiB
Plaintext
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=pod
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=head1 NAME
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OSSL_DISPATCH - OpenSSL Core type to define a dispatchable function table
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=head1 SYNOPSIS
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#include <openssl/core.h>
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typedef struct ossl_dispatch_st OSSL_DISPATCH;
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struct ossl_dispatch_st {
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int function_id;
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void (*function)(void);
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};
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=head1 DESCRIPTION
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This type is a tuple of function identity and function pointer.
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Arrays of this type are passed between the OpenSSL libraries and the
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providers to describe what functionality one side provides to the other.
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Arrays of this type must be terminated with a tuple having function identity
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zero and function pointer NULL.
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=head2 B<OSSL_DISPATCH> fields
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=over 4
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=item I<function_id>
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OpenSSL defined function identity of the implemented function.
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=item I<function>
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Pointer to the implemented function itself. Despite the generic definition
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of this field, the implemented function it points to must have a function
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signature that corresponds to the I<function_id>
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=back
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Available function identities and corresponding function signatures are
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defined in L<openssl-core_dispatch.h(7)>.
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Furthermore, the chosen function identities and associated function
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signature must be chosen specifically for the operation that it's intended
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for, as determined by the intended L<OSSL_ALGORITHM(3)> array.
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Any function identity not recognised by the recipient of this type
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will be ignored.
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This ensures that providers built with one OpenSSL version in mind
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will work together with any other OpenSSL version that supports this
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mechanism.
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=begin comment RETURN VALUES doesn't make sense for a manual that only
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describes a type, but document checkers still want that section, and
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to have more than just the section title.
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=head1 RETURN VALUES
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txt
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=end comment
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=head1 SEE ALSO
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L<crypto(7)>, L<openssl-core_dispatch.h(7)>, L<OSSL_ALGORITHM(3)>
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=head1 HISTORY
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B<OSSL_DISPATCH> was added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (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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