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 preallocated and 23initialized B<BN_CTX>. 24 25RSA_blinding_off() turns blinding off and frees the memory used for 26the blinding factor. 27 28=head1 RETURN VALUES 29 30RSA_blinding_on() returns 1 on success, and 0 if an error occurred. 31 32RSA_blinding_off() returns no value. 33 34=head1 COPYRIGHT 35 36Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved. 37 38Licensed under the OpenSSL license (the "License"). You may not use 39this file except in compliance with the License. You can obtain a copy 40in the file LICENSE in the source distribution or at 41L<https://www.openssl.org/source/license.html>. 42 43=cut 44