OSSL_DISPATCH(3SSL) OpenSSL OSSL_DISPATCH(3SSL)
NAME
OSSL_DISPATCH, OSSL_DISPATCH_END - OpenSSL Core type to define a
dispatchable function table
SYNOPSIS
#include <openssl/core.h>
typedef struct ossl_dispatch_st OSSL_DISPATCH;
struct ossl_dispatch_st {
int function_id;
void (*function)(void);
};
#define OSSL_DISPATCH_END
DESCRIPTION
This type is a tuple of function identity and function pointer. Arrays
of this type are passed between the OpenSSL libraries and the providers
to describe what functionality one side provides to the other.
Arrays of this type must be terminated with the OSSL_DISPATCH_END macro.
OSSL_DISPATCH fields
function_id
OpenSSL defined function identity of the implemented function.
function
Pointer to the implemented function itself. Despite the generic
definition of this field, the implemented function it points to must
have a function signature that corresponds to the function_id
Available function identities and corresponding function signatures are
defined in openssl-core_dispatch.h(7). Furthermore, the chosen function
identities and associated function signature must be chosen specifically
for the operation that it's intended for, as determined by the intended
OSSL_ALGORITHM(3) array.
Any function identity not recognised by the recipient of this type will
be ignored. This ensures that providers built with one OpenSSL version
in mind will work together with any other OpenSSL version that supports
this mechanism.
SEE ALSO
crypto(7), openssl-core_dispatch.h(7), OSSL_ALGORITHM(3)
HISTORY
OSSL_DISPATCH was added in OpenSSL 3.0.
COPYRIGHT
Copyright 2022-2023 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
<https://www.openssl.org/source/license.html>.
3.5.7 2026-06-09 OSSL_DISPATCH(3SSL)
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