#include <openssl/rsa.h>
+The following functions have been deprecated since OpenSSL 3.0, and can be
+hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
+see L<openssl_user_macros(7)>:
+
int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
void RSA_blinding_off(RSA *rsa);
=head1 DESCRIPTION
+All of the functions described on this page are deprecated.
+
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.
RSA_blinding_on() turns blinding on for key B<rsa> and generates a
-random blinding factor. B<ctx> is B<NULL> or a pre-allocated and
-initialized B<BN_CTX>. The random number generator must be seeded
-prior to calling RSA_blinding_on().
+random blinding factor. B<ctx> is B<NULL> or a preallocated and
+initialized B<BN_CTX>.
RSA_blinding_off() turns blinding off and frees the memory used for
the blinding factor.
RSA_blinding_off() returns no value.
+=head1 HISTORY
+
+All of these functions were deprecated in OpenSSL 3.0.
+
=head1 COPYRIGHT
-Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy