RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks
#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.
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