[thirdparty/openssl.git] / doc / man3 / RSA_blinding_on.pod

=pod

=head1 NAME

RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks

=head1 SYNOPSIS

 #include <openssl/rsa.h>

 int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);

 void RSA_blinding_off(RSA *rsa);

=head1 DESCRIPTION

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>.

RSA_blinding_off() turns blinding off and frees the memory used for
the blinding factor.

=head1 RETURN VALUES

RSA_blinding_on() returns 1 on success, and 0 if an error occurred.

RSA_blinding_off() returns no value.

=head1 COPYRIGHT

Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

=cut
Commit	Line	Data
2186cd8e UM	1	=pod
	2
	3	=head1 NAME
	4
4d524e10	5	RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks
2186cd8e UM	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
6a3fff5e	17	RSA is vulnerable to timing attacks. In a setup where attackers can
2186cd8e UM	18	measure the time of RSA decryption or signature operations, blinding
	19	must be used to protect the RSA operation from that attack.
	20
	21	RSA_blinding_on() turns blinding on for key B<rsa> and generates a
	22	random blinding factor. B<ctx> is B<NULL> or a pre-allocated and
f987a4dd	23	initialized B<BN_CTX>.
2186cd8e UM	24
	25	RSA_blinding_off() turns blinding off and frees the memory used for
	26	the blinding factor.
	27
	28	=head1 RETURN VALUES
	29
	30	RSA_blinding_on() returns 1 on success, and 0 if an error occurred.
	31
	32	RSA_blinding_off() returns no value.
	33
e2f92610 RS	34	=head1 COPYRIGHT
e2f92610 RS	35
1cb7eff4	36	Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
e2f92610 RS	37
	38	Licensed under the OpenSSL license (the "License"). You may not use
	39	this file except in compliance with the License. You can obtain a copy
	40	in the file LICENSE in the source distribution or at
	41	L<https://www.openssl.org/source/license.html>.
	42
	43	=cut