RSA_blinding_on, RSA_blinding_off — protect the RSA operation from timing attacks
RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
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.
RSA_blinding_on() returns 1 on success, and 0 if an error
RSA_blinding_off() returns no value.
RSA_blinding_on() and RSA_blinding_off() appeared in SSLeay