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-.\"     $OpenBSD: RSA_check_key.3,v 1.10 2023/11/19 21:06:15 tb Exp $
-.\"     OpenSSL 6859cf74 Sep 25 13:33:28 2002 +0000
-.\"
-.\" This file was written by Ulf Moeller <ulf@openssl.org> and
-.\" Geoff Thorpe <geoff@openssl.org>.
-.\" Copyright (c) 2000, 2002 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,
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-.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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-.\"
-.Dd $Mdocdate: November 19 2023 $
-.Dt RSA_CHECK_KEY 3
-.Os
-.Sh NAME
-.Nm RSA_check_key
-.Nd validate private RSA keys
-.Sh SYNOPSIS
-.In openssl/rsa.h
-.Ft int
-.Fo RSA_check_key
-.Fa "RSA *rsa"
-.Fc
-.Sh DESCRIPTION
-This function validates RSA keys.
-It checks that
-.Fa rsa->p
-and
-.Fa rsa->q
-are in fact prime, and that
-.Fa rsa->n
-satisfies n = p*q.
-.Pp
-It also checks that
-.Fa rsa->d
-and
-.Fa rsa->e
-satisfy d*e = 1 mod ((p-1)*(q-1)),
-and that
-.Fa rsa->dmp1 ,
-.Fa rsa->dmq1 ,
-and
-.Fa resa->iqmp
-are set correctly or are
-.Dv NULL .
-.Pp
-This function does not work on RSA public keys that have only the
-modulus and public exponent elements populated.
-It performs integrity checks on all the RSA key material, so the
-.Vt RSA
-key structure must contain all the private key data too.
-Therefore, it cannot be used with any arbitrary
-.Vt RSA
-key object, even if it is otherwise fit for regular RSA operation.
-.Sh RETURN VALUES
-.Fn RSA_check_key
-returns 1 if
-.Fa rsa
-is a valid RSA key, and 0 otherwise.
--1 is returned if an error occurs while checking the key.
-.Pp
-If the key is invalid or an error occurred, the reason code can be
-obtained using
-.Xr ERR_get_error 3 .
-.Sh SEE ALSO
-.Xr BN_is_prime_ex 3 ,
-.Xr RSA_get0_key 3 ,
-.Xr RSA_new 3
-.Sh HISTORY
-.Fn RSA_check_key
-first appeared in OpenSSL 0.9.4 and has been available since
-.Ox 2.6 .
-.Sh BUGS
-A method of verifying the RSA key using opaque RSA API functions might
-need to be considered.
-Right now
-.Fn RSA_check_key
-simply uses the
-.Vt RSA
-structure elements directly, bypassing the
-.Vt RSA_METHOD
-table altogether (and completely violating encapsulation and
-object-orientation in the process).
-The best fix will probably be to introduce a
-.Fn check_key
-handler
-to the
-.Vt RSA_METHOD
-function table so that alternative implementations can also provide
-their own verifiers.