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.\" $OpenBSD: EVP_PKEY_CTX_new.3,v 1.7 2018/03/23 04:34:23 schwarze Exp $
.\" OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
.\"
.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
.\" Copyright (c) 2006, 2009, 2015 The OpenSSL Project. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\"
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in
.\" the documentation and/or other materials provided with the
.\" distribution.
.\"
.\" 3. All advertising materials mentioning features or use of this
.\" software must display the following acknowledgment:
.\" "This product includes software developed by the OpenSSL Project
.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
.\"
.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
.\" endorse or promote products derived from this software without
.\" prior written permission. For written permission, please contact
.\" openssl-core@openssl.org.
.\"
.\" 5. Products derived from this software may not be called "OpenSSL"
.\" nor may "OpenSSL" appear in their names without prior written
.\" permission of the OpenSSL Project.
.\"
.\" 6. Redistributions of any form whatsoever must retain the following
.\" acknowledgment:
.\" "This product includes software developed by the OpenSSL Project
.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)"
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
.\" OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd $Mdocdate: March 23 2018 $
.Dt EVP_PKEY_CTX_NEW 3
.Os
.Sh NAME
.Nm EVP_PKEY_CTX_new ,
.Nm EVP_PKEY_CTX_new_id ,
.Nm EVP_PKEY_CTX_dup ,
.Nm EVP_PKEY_CTX_free
.Nd public key algorithm context functions
.Sh SYNOPSIS
.In openssl/evp.h
.Ft EVP_PKEY_CTX *
.Fo EVP_PKEY_CTX_new
.Fa "EVP_PKEY *pkey"
.Fa "ENGINE *e"
.Fc
.Ft EVP_PKEY_CTX *
.Fo EVP_PKEY_CTX_new_id
.Fa "int id"
.Fa "ENGINE *e"
.Fc
.Ft EVP_PKEY_CTX *
.Fo EVP_PKEY_CTX_dup
.Fa "EVP_PKEY_CTX *ctx"
.Fc
.Ft void
.Fo EVP_PKEY_CTX_free
.Fa "EVP_PKEY_CTX *ctx"
.Fc
.Sh DESCRIPTION
The
.Fn EVP_PKEY_CTX_new
function allocates a public key algorithm context using the algorithm
specified in
.Fa pkey
and the
.Vt ENGINE
.Fa e .
.Pp
The
.Fn EVP_PKEY_CTX_new_id
function allocates a public key algorithm context using the algorithm
specified by
.Fa id
and
.Vt ENGINE
.Fa e .
It is normally used when no
.Vt EVP_PKEY
structure is associated with the operations, for example during
parameter generation of key generation for some algorithms.
.Pp
.Fn EVP_PKEY_CTX_dup
duplicates the context
.Fa ctx .
.Pp
.Fn EVP_PKEY_CTX_free
frees up the context
.Fa ctx .
If
.Fa ctx
is a
.Dv NULL
pointer, no action occurs.
.Sh RETURN VALUES
.Fn EVP_PKEY_CTX_new ,
.Fn EVP_PKEY_CTX_new_id ,
and
.Fn EVP_PKEY_CTX_dup
return either the newly allocated
.Vt EVP_PKEY_CTX
structure or
.Dv NULL
if an error occurred.
.Sh SEE ALSO
.Xr EVP_PKEY_meth_set_init 3 ,
.Xr EVP_PKEY_new 3 ,
.Xr X25519 3
.Sh HISTORY
These functions first appeared in OpenSSL 1.0.0
and have been available since
.Ox 4.9 .
.Sh CAVEATS
The
.Vt EVP_PKEY_CTX
structure is an opaque public key algorithm context used by the OpenSSL
high level public key API.
Contexts
.Sy MUST NOT
be shared between threads.
It is not permissible to use the same context simultaneously in two
threads.
|
