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.
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.
SEE ALSO
HISTORY
RSA_blinding_on() and
RSA_blinding_off() first appeared in SSLeay 0.9.0
and have been available since OpenBSD 2.4.