5 RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks
9 #include <openssl/rsa.h>
11 Deprecated since OpenSSL 3.0, can be hidden entirely by defining
12 B<OPENSSL_API_COMPAT> with a suitable version value, see
13 L<openssl_user_macros(7)>:
15 int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
17 void RSA_blinding_off(RSA *rsa);
21 All of the functions described on this page are deprecated.
23 RSA is vulnerable to timing attacks. In a setup where attackers can
24 measure the time of RSA decryption or signature operations, blinding
25 must be used to protect the RSA operation from that attack.
27 RSA_blinding_on() turns blinding on for key B<rsa> and generates a
28 random blinding factor. B<ctx> is B<NULL> or a preallocated and
29 initialized B<BN_CTX>.
31 RSA_blinding_off() turns blinding off and frees the memory used for
36 RSA_blinding_on() returns 1 on success, and 0 if an error occurred.
38 RSA_blinding_off() returns no value.
42 All of these functions were deprecated in OpenSSL 3.0.
46 Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
48 Licensed under the Apache License 2.0 (the "License"). You may not use
49 this file except in compliance with the License. You can obtain a copy
50 in the file LICENSE in the source distribution or at
51 L<https://www.openssl.org/source/license.html>.