1=pod
2
3=head1 NAME
4
5RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks
6
7=head1 SYNOPSIS
8
9 #include <openssl/rsa.h>
10
11 int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
12
13 void RSA_blinding_off(RSA *rsa);
14
15=head1 DESCRIPTION
16
17RSA is vulnerable to timing attacks. In a setup where attackers can
18measure the time of RSA decryption or signature operations, blinding
19must be used to protect the RSA operation from that attack.
20
21RSA_blinding_on() turns blinding on for key B<rsa> and generates a
22random blinding factor. B<ctx> is B<NULL> or a pre-allocated and
23initialized B<BN_CTX>. The random number generator must be seeded
24prior to calling RSA_blinding_on().
25
26RSA_blinding_off() turns blinding off and frees the memory used for
27the blinding factor.
28
29=head1 RETURN VALUES
30
31RSA_blinding_on() returns 1 on success, and 0 if an error occurred.
32
33RSA_blinding_off() returns no value.
34
35=head1 COPYRIGHT
36
37Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
38
39Licensed under the OpenSSL license (the "License").  You may not use
40this file except in compliance with the License.  You can obtain a copy
41in the file LICENSE in the source distribution or at
42L<https://www.openssl.org/source/license.html>.
43
44=cut
45