97 lines
3.5 KiB
Groff
97 lines
3.5 KiB
Groff
.\" $OpenBSD: RSA_blinding_on.3,v 1.7 2023/07/26 20:08:59 tb Exp $
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.\" OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
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.\"
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.\" This file was written by Ulf Moeller <ulf@openssl.org>.
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.\" Copyright (c) 2000 The OpenSSL Project. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\"
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in
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.\" the documentation and/or other materials provided with the
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.\" distribution.
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.\"
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.\" 3. All advertising materials mentioning features or use of this
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.\" software must display the following acknowledgment:
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.\" "This product includes software developed by the OpenSSL Project
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.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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.\"
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.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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.\" endorse or promote products derived from this software without
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.\" prior written permission. For written permission, please contact
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.\" openssl-core@openssl.org.
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.\"
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.\" 5. Products derived from this software may not be called "OpenSSL"
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.\" nor may "OpenSSL" appear in their names without prior written
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.\" permission of the OpenSSL Project.
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.\"
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.\" 6. Redistributions of any form whatsoever must retain the following
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.\" acknowledgment:
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.\" "This product includes software developed by the OpenSSL Project
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.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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.\" OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd $Mdocdate: July 26 2023 $
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.Dt RSA_BLINDING_ON 3
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.Os
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.Sh NAME
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.Nm RSA_blinding_on ,
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.Nm RSA_blinding_off
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.Nd protect the RSA operation from timing attacks
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.Sh SYNOPSIS
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.In openssl/rsa.h
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.Ft int
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.Fo RSA_blinding_on
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.Fa "RSA *rsa"
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.Fa "BN_CTX *ctx"
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.Fc
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.Ft void
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.Fo RSA_blinding_off
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.Fa "RSA *rsa"
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.Fc
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.Sh DESCRIPTION
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RSA is vulnerable to timing attacks.
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In a setup where attackers can measure the time of RSA decryption or
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signature operations, blinding must be used to protect the RSA operation
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from that attack.
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.Pp
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.Fn RSA_blinding_on
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turns blinding on for key
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.Fa rsa
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and generates a random blinding factor.
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.Fa ctx
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is
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.Dv NULL
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or a pre-allocated and initialized
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.Vt BN_CTX .
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.Pp
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.Fn RSA_blinding_off
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turns blinding off and frees the memory used for the blinding factor.
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.Sh RETURN VALUES
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.Fn RSA_blinding_on
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returns 1 on success, and 0 if an error occurred.
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.Sh SEE ALSO
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.Xr RSA_new 3
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.Sh HISTORY
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.Fn RSA_blinding_on
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and
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.Fn RSA_blinding_off
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first appeared in SSLeay 0.9.0 and have been available since
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.Ox 2.4 .
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