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NAME

       RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks

SYNOPSIS

        #include <openssl/rsa.h>

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

        void RSA_blinding_off(RSA *rsa);

DESCRIPTION

       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 pre-allocated and initialized BN_CTX. The random number generator must be
       seeded prior to calling RSA_blinding_on().

       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.

COPYRIGHT

       Copyright 2000-2016 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 <https://www.openssl.org/source/license.html>.