.\" $OpenBSD: ENGINE_register_RSA.3,v 1.2 2018/04/18 03:39:22 schwarze Exp $
.\" content checked up to:
.\" OpenSSL ENGINE_add 1f13ad31 Dec 25 17:50:39 2017 +0800
.\"
.\" Copyright (c) 2018 Ingo Schwarze <schwarze@openbsd.org>
.\"
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.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.Dd $Mdocdate: April 18 2018 $
.Dt ENGINE_REGISTER_RSA 3
.Os
.Sh NAME
.Nm ENGINE_register_RSA ,
.Nm ENGINE_register_DSA ,
.Nm ENGINE_register_ECDH ,
.Nm ENGINE_register_ECDSA ,
.Nm ENGINE_register_DH ,
.Nm ENGINE_register_RAND ,
.Nm ENGINE_register_STORE ,
.Nm ENGINE_register_ciphers ,
.Nm ENGINE_register_digests ,
.Nm ENGINE_register_complete
.Nd register an ENGINE as implementing an algorithm
.Sh SYNOPSIS
.In openssl/engine.h
.Ft int
.Fo ENGINE_register_RSA
.Fa "ENGINE *e"
.Fc
.Ft int
.Fo ENGINE_register_DSA
.Fa "ENGINE *e"
.Fc
.Ft int
.Fo ENGINE_register_ECDH
.Fa "ENGINE *e"
.Fc
.Ft int
.Fo ENGINE_register_ECDSA
.Fa "ENGINE *e"
.Fc
.Ft int
.Fo ENGINE_register_DH
.Fa "ENGINE *e"
.Fc
.Ft int
.Fo ENGINE_register_RAND
.Fa "ENGINE *e"
.Fc
.Ft int
.Fo ENGINE_register_STORE
.Fa "ENGINE *e"
.Fc
.Ft int
.Fo ENGINE_register_ciphers
.Fa "ENGINE *e"
.Fc
.Ft int
.Fo ENGINE_register_digests
.Fa "ENGINE *e"
.Fc
.Ft int
.Fo ENGINE_register_complete
.Fa "ENGINE *e"
.Fc
.Sh DESCRIPTION
In addition to the global table described in
.Xr ENGINE_add 3 ,
the crypto library maintains several tables containing references to
.Vt ENGINE
objects implementing one specific cryptographic algorithm.
.Pp
The functions listed in the present manual page append
.Fa e
to the end of the table for the respective algorithm.
.Pp
If
.Fa e
does not contain a method for the requested algorithm,
these functions succeed without having any effect.
.Pp
If
.Fa e
is already registered for the given algorithm,
they move it to the end of the respective table.
.Pp
.Fn ENGINE_register_ciphers
and
.Fn ENGINE_register_digests
are special in so far as an engine may implement
more than one cipher or more than one digest.
In that case,
.Fa e
is registered for all the ciphers or digests it implements.
.Pp
.Fn ENGINE_register_complete
registers
.Fa e
for all algorithms it implements by calling all the other functions.
.Sh RETURN VALUES
These functions return 1 on success or 0 on error.
They only fail if insufficient memory is available.
.Sh SEE ALSO
.Xr ENGINE_add 3 ,
.Xr ENGINE_get_default_RSA 3 ,
.Xr ENGINE_init 3 ,
.Xr ENGINE_new 3 ,
.Xr ENGINE_register_all_RSA 3 ,
.Xr ENGINE_set_default 3 ,
.Xr ENGINE_set_RSA 3 ,
.Xr ENGINE_unregister_RSA 3
.Sh HISTORY
.Fn ENGINE_register_RSA ,
.Fn ENGINE_register_DSA ,
.Fn ENGINE_register_DH ,
.Fn ENGINE_register_RAND ,
.Fn ENGINE_register_ciphers ,
.Fn ENGINE_register_digests ,
and
.Fn ENGINE_register_complete
first appeared in OpenSSL 0.9.7 and have been available since
.Ox 3.2 .
.Pp
.Fn ENGINE_register_ECDH ,
.Fn ENGINE_register_ECDSA ,
and
.Fn ENGINE_register_STORE
first appeared in OpenSSL 0.9.8 and have been available since
.Ox 4.5 .
.Sh BUGS
.Fn ENGINE_register_complete
ignores all errors, even memory allocation failure, and always returns 1.