1RSA_BLINDING_ON(3)                  OpenSSL                 RSA_BLINDING_ON(3)
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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        int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
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14        void RSA_blinding_off(RSA *rsa);
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DESCRIPTION

17       RSA is vulnerable to timing attacks. In a setup where attackers can
18       measure the time of RSA decryption or signature operations, blinding
19       must be used to protect the RSA operation from that attack.
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21       RSA_blinding_on() turns blinding on for key rsa and generates a random
22       blinding factor. ctx is NULL or a preallocated and initialized BN_CTX.
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24       RSA_blinding_off() turns blinding off and frees the memory used for the
25       blinding factor.
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RETURN VALUES

28       RSA_blinding_on() returns 1 on success, and 0 if an error occurred.
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30       RSA_blinding_off() returns no value.
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33       Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
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35       Licensed under the OpenSSL license (the "License").  You may not use
36       this file except in compliance with the License.  You can obtain a copy
37       in the file LICENSE in the source distribution or at
38       <https://www.openssl.org/source/license.html>.
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421.1.1i                            2021-01-26                RSA_BLINDING_ON(3)
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