Updated: 2022/Sep/29

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RSA_blinding_on(3)                  OpenSSL                 RSA_blinding_on(3)

       RSA_blinding_on, RSA_blinding_off - protect the RSA operation from
       timing attacks

       libcrypto, -lcrypto

        #include <openssl/rsa.h>

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

        void RSA_blinding_off(RSA *rsa);

       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.

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

       RSA_blinding_off() returns no value.

       Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (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

1.1.1i                            2020-12-10                RSA_blinding_on(3)