1RSA_BLINDING_ON(3ossl)              OpenSSL             RSA_BLINDING_ON(3ossl)
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NAME

6       RSA_blinding_on, RSA_blinding_off - protect the RSA operation from
7       timing attacks
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SYNOPSIS

10        #include <openssl/rsa.h>
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12       The following functions have been deprecated since OpenSSL 3.0, and can
13       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
14       version value, see openssl_user_macros(7):
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16        int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
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18        void RSA_blinding_off(RSA *rsa);
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DESCRIPTION

21       All of the functions described on this page are deprecated.
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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.
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27       RSA_blinding_on() turns blinding on for key rsa and generates a random
28       blinding factor. ctx is NULL or a preallocated and initialized BN_CTX.
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30       RSA_blinding_off() turns blinding off and frees the memory used for the
31       blinding factor.
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RETURN VALUES

34       RSA_blinding_on() returns 1 on success, and 0 if an error occurred.
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36       RSA_blinding_off() returns no value.
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HISTORY

39       All of these functions were deprecated in OpenSSL 3.0.
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42       Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
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44       Licensed under the Apache License 2.0 (the "License").  You may not use
45       this file except in compliance with the License.  You can obtain a copy
46       in the file LICENSE in the source distribution or at
47       <https://www.openssl.org/source/license.html>.
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513.1.1                             2023-08-31            RSA_BLINDING_ON(3ossl)
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