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.
SEE ALSO¶
rsa(3),
rand(3)
HISTORY¶
RSA_blinding_on() and
RSA_blinding_off() appeared in SSLeay
0.9.0.