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-.\"     $OpenBSD: RSA_blinding_on.3,v 1.7 2023/07/26 20:08:59 tb Exp $
-.\"     OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
-.\"
-.\" This file was written by Ulf Moeller <ulf@openssl.org>.
-.\" Copyright (c) 2000 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,
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-.\"
-.Dd $Mdocdate: July 26 2023 $
-.Dt RSA_BLINDING_ON 3
-.Os
-.Sh NAME
-.Nm RSA_blinding_on ,
-.Nm RSA_blinding_off
-.Nd protect the RSA operation from timing attacks
-.Sh SYNOPSIS
-.In openssl/rsa.h
-.Ft int
-.Fo RSA_blinding_on
-.Fa "RSA *rsa"
-.Fa "BN_CTX *ctx"
-.Fc
-.Ft void
-.Fo RSA_blinding_off
-.Fa "RSA *rsa"
-.Fc
-.Sh DESCRIPTION
-RSA is vulnerable to timing attacks.
-In a setup where attackers can measure the time of RSA decryption or
-signature operations, blinding must be used to protect the RSA operation
-from that attack.
-.Pp
-.Fn RSA_blinding_on
-turns blinding on for key
-.Fa rsa
-and generates a random blinding factor.
-.Fa ctx
-is
-.Dv NULL
-or a pre-allocated and initialized
-.Vt BN_CTX .
-.Pp
-.Fn RSA_blinding_off
-turns blinding off and frees the memory used for the blinding factor.
-.Sh RETURN VALUES
-.Fn RSA_blinding_on
-returns 1 on success, and 0 if an error occurred.
-.Sh SEE ALSO
-.Xr RSA_new 3
-.Sh HISTORY
-.Fn RSA_blinding_on
-and
-.Fn RSA_blinding_off
-first appeared in SSLeay 0.9.0 and have been available since
-.Ox 2.4 .