Home | History | Annotate | Line # | Download | only in man 
 $NetBSD: OSSL_DISPATCH.3,v 1.5 2026/04/08 17:06:45 christos Exp $

 -*- mode: troff; coding: utf-8 -*-
 Automatically generated by Pod::Man v6.0.2 (Pod::Simple 3.45)

 Standard preamble:
 ========================================================================
..

..


..
 \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
. ds C` ""
. ds C' ""
'br\}
. ds C`
. ds C'
'br\}

 Escape single quotes in literal strings from groff's Unicode transform.

 If the F register is >0, we'll generate index entries on stderr for
 titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
 entries marked with X<> in POD. Of course, you'll have to process the
 output yourself in some meaningful fashion.

 Avoid warning from groff about undefined register 'F'.
..
.nr rF 0
. if \nF \{\
. de IX
. tm Index:\\$1\t\\n%\t"\\$2"
..
. if !\nF==2 \{\
. nr % 0
. nr F 2
. \}
. \}
.\}
.rr rF

 Required to disable full justification in groff 1.23.0.
 ========================================================================

 Title "OSSL_DISPATCH 3" 
 OSSL_DISPATCH 3 2026-04-07 3.5.6 OpenSSL
 For nroff, turn off justification. Always turn off hyphenation; it makes
 way too many mistakes in technical documents.
.nh

 NAME
OSSL_DISPATCH, OSSL_DISPATCH_END - OpenSSL Core type to define a dispatchable function table

 SYNOPSIS
 Header "SYNOPSIS" .Vb 1
 #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
.Ve

 DESCRIPTION
 Header "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"
 Subsection "OSSL_DISPATCH fields" 
 function_id 4
 Item "function_id" OpenSSL defined function identity of the implemented function.

 function 4
 Item "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\*(Aqs 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"
 Header "SEE ALSO" \fBcrypto\|(7), openssl-core_dispatch.h\|(7), OSSL_ALGORITHM\|(3)

 HISTORY
 Header "HISTORY" \fBOSSL_DISPATCH was added in OpenSSL 3.0.

 COPYRIGHT
 Header "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>.