- NAME
- SYNOPSIS
- DESCRIPTION
- RETURN VALUES
- COPYRIGHT

# 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.