| 1 | =pod
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| 2 |
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| 3 | =head1 NAME
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| 4 |
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| 5 | RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks
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| 6 |
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| 7 | =head1 SYNOPSIS
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| 8 |
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| 9 | #include <openssl/rsa.h>
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| 10 |
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| 11 | The following functions have been deprecated since OpenSSL 3.0, and can be
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| 12 | hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
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| 13 | see L<openssl_user_macros(7)>:
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| 14 |
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| 15 | int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
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| 16 |
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| 17 | void RSA_blinding_off(RSA *rsa);
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| 18 |
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| 19 | =head1 DESCRIPTION
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| 20 |
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| 21 | All of the functions described on this page are deprecated.
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| 22 |
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| 23 | RSA is vulnerable to timing attacks. In a setup where attackers can
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| 24 | measure the time of RSA decryption or signature operations, blinding
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| 25 | must be used to protect the RSA operation from that attack.
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| 26 |
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| 27 | RSA_blinding_on() turns blinding on for key B<rsa> and generates a
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| 28 | random blinding factor. B<ctx> is B<NULL> or a preallocated and
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| 29 | initialized B<BN_CTX>.
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| 30 |
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| 31 | RSA_blinding_off() turns blinding off and frees the memory used for
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| 32 | the blinding factor.
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| 33 |
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| 34 | =head1 RETURN VALUES
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| 35 |
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| 36 | RSA_blinding_on() returns 1 on success, and 0 if an error occurred.
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| 37 |
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| 38 | RSA_blinding_off() returns no value.
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| 39 |
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| 40 | =head1 HISTORY
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| 41 |
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| 42 | All of these functions were deprecated in OpenSSL 3.0.
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| 43 |
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| 44 | =head1 COPYRIGHT
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| 45 |
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| 46 | Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
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| 47 |
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| 48 | Licensed under the Apache License 2.0 (the "License"). You may not use
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| 49 | this file except in compliance with the License. You can obtain a copy
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| 50 | in the file LICENSE in the source distribution or at
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| 51 | L<https://www.openssl.org/source/license.html>.
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| 52 |
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| 53 | =cut
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