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-.\" $OpenBSD: EVP_PKEY_check.3,v 1.2 2022/07/14 14:49:09 tb Exp $
-.\"
-.\" Copyright (c) 2022 Ingo Schwarze <schwarze@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" 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
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: July 14 2022 $
-.Dt EVP_PKEY_CHECK 3
-.Os
-.Sh NAME
-.Nm EVP_PKEY_check ,
-.Nm EVP_PKEY_public_check ,
-.Nm EVP_PKEY_param_check
-.Nd key and parameter check functions
-.Sh SYNOPSIS
-.In openssl/evp.h
-.Ft int
-.Fn EVP_PKEY_check "EVP_PKEY_CTX *ctx"
-.Ft int
-.Fn EVP_PKEY_public_check "EVP_PKEY_CTX *ctx"
-.Ft int
-.Fn EVP_PKEY_param_check "EVP_PKEY_CTX *ctx"
-.Sh DESCRIPTION
-.Fn EVP_PKEY_check
-performs various sanity checks on the key contained in
-.Fa ctx
-but only supports a small number of key types by default.
-It preferably uses the function
-.Fa check
-configured for
-.Fa ctx
-with
-.Xr EVP_PKEY_meth_set_check 3 .
-It falls back to the function
-.Fa pkey_check
-configured for the private key contained in
-.Fa ctx
-with
-.Xr EVP_PKEY_asn1_set_check 3 .
-If that wasn't configured either, it attempts to use the following
-check functions:
-.Pp
-.Bl -tag -width 3n -compact -offset -indent
-.It DH
-not supported, return value \-2
-.It EC
-.Xr EC_KEY_check_key 3
-.It RSA
-.Xr RSA_check_key 3
-.El
-.Pp
-.Fn EVP_PKEY_public_check
-performs various sanity checks on the public key contained in
-.Fa ctx
-but only supports a small number of key types by default.
-It preferably uses the function
-.Fa public_check
-configured for
-.Fa ctx
-with
-.Xr EVP_PKEY_meth_set_public_check 3 .
-It falls back to the function
-.Fa pkey_public_check
-configured for the private key contained in
-.Fa ctx
-with
-.Xr EVP_PKEY_asn1_set_public_check 3 .
-If that wasn't configured either, it attempts to use the following
-check functions:
-.Pp
-.Bl -tag -width 3n -compact -offset -indent
-.It DH
-.Xr DH_check_pub_key 3
-.It EC
-.Xr EC_KEY_check_key 3
-.It RSA
-not supported, return value \-2
-.El
-.Pp
-.Fn EVP_PKEY_param_check
-performs various sanity checks on the key parameters contained in
-.Fa ctx
-but only supports a small number of key types by default.
-It preferably uses the function
-.Fa check
-configured for
-.Fa ctx
-with
-.Xr EVP_PKEY_meth_set_param_check 3 .
-It falls back to the function
-.Fa pkey_check
-configured for the private key contained in
-.Fa ctx
-with
-.Xr EVP_PKEY_asn1_set_param_check 3 .
-If that wasn't configured either, it attempts to use the following
-check functions:
-.Pp
-.Bl -tag -width 3n -compact -offset -indent
-.It DH
-.Xr DH_check 3
-.It EC
-.Xr EC_GROUP_check 3
-.It RSA
-not supported, return value \-2
-.El
-.Sh RETURN VALUES
-These functions return 1 if the check was performed and no problem
-was found, 0 if a problem was found or if the check could not be
-performed, for example because
-.Fa ctx
-does not contain an
-.Vt EVP_PKEY
-object, or \-2 if the required check function is neither configured for
-.Fa ctx
-nor for the
-.Vt PKEY
-contained therein, and the check in question is not supported by default
-for the algorithm in question either.
-.Sh SEE ALSO
-.Xr DH_check 3 ,
-.Xr EC_GROUP_check 3 ,
-.Xr EC_KEY_new 3 ,
-.Xr EVP_PKEY_asn1_new 3 ,
-.Xr EVP_PKEY_CTX_new 3 ,
-.Xr EVP_PKEY_meth_new 3 ,
-.Xr EVP_PKEY_new 3 ,
-.Xr RSA_check_key 3
-.Sh HISTORY
-These functions first appeared in OpenSSL 1.1.1
-and have been available since
-.Ox 7.1 .
-.Sh BUGS
-For EC keys,
-.Fn EVP_PKEY_public_check
-also checks the
-.Em private
-key and fails if there is a problem with any of the private
-components, even if no problem is found with the public key.