/xlv3/openssl/0.9.7e-sgipl1/work/0.9.7e-sgipl1/openssl-
0.9.7e/doc/crypto
Page 1 (printed 10/20/05)
RSA_blinding_on(3) 24/Feb/2000 (0.9.7e) RSA_blinding_on(3)
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.
Page 1 (printed 10/20/05)
