=pod
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=head1 NAME
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RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks
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=head1 SYNOPSIS
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#include <openssl/rsa.h>
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int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
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void RSA_blinding_off(RSA *rsa);
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=head1 DESCRIPTION
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RSA is vulnerable to timing attacks. In a setup where attackers can
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measure the time of RSA decryption or signature operations, blinding
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must be used to protect the RSA operation from that attack.
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RSA_blinding_on() turns blinding on for key B<rsa> and generates a
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random blinding factor. B<ctx> is B<NULL> or a preallocated and
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initialized B<BN_CTX>.
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RSA_blinding_off() turns blinding off and frees the memory used for
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the blinding factor.
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=head1 RETURN VALUES
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RSA_blinding_on() returns 1 on success, and 0 if an error occurred.
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RSA_blinding_off() returns no value.
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=head1 COPYRIGHT
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Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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