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.
HISTORY
RSA_blinding_on() and RSA_blinding_off() appeared in SSLeay
0.9.0.
