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1 | =pod |
2 | ||
3 | =head1 NAME | |
4 | ||
4d524e10 | 5 | RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks |
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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 |
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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 | |
262c0088 | 23 | initialized B<BN_CTX>. |
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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 |
35 | ||
36 | Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. | |
37 | ||
4746f25a | 38 | Licensed under the Apache License 2.0 (the "License"). You may not use |
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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 |