Updated: 2022/Sep/29

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RSA_blinding_on(3)                  OpenSSL                 RSA_blinding_on(3)



NAME
       RSA_blinding_on, RSA_blinding_off - protect the RSA operation from
       timing attacks

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/rsa.h>

       The following functions have been deprecated since OpenSSL 3.0, and can
       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
       version value, see openssl_user_macros(7):

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

        void RSA_blinding_off(RSA *rsa);

DESCRIPTION
       All of the functions described on this page are deprecated.

       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 rsa and generates a random
       blinding factor. ctx is NULL or a preallocated and initialized BN_CTX.

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

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

       RSA_blinding_off() returns no value.

HISTORY
       All of these functions were deprecated in OpenSSL 3.0.

COPYRIGHT
       Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (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
       <https://www.openssl.org/source/license.html>.



3.0.12                            2023-05-07                RSA_blinding_on(3)