RSA_blinding_on(3)RSA_blinding_on(3)NAME
RSA_blinding_on, RSA_blinding_off - Protect the RSA operation from tim‐
ing 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.
The RSA_blinding_on() function turns blinding on for key rsa and gener‐
ates a random blinding factor. The ctx is NULL or a pre-allocated and
initialized BN_CTX. The random number generator must be seeded prior to
calling the RSA_blinding_on() function.
The RSA_blinding_off() function turns blinding off and frees the memory
used for the blinding factor.
RETURN VALUES
The RSA_blinding_on() function returns 1 on success, and 0 if an error
occurred.
The RSA_blinding_off() function returns no value.
HISTORY
The RSA_blinding_on() and RSA_blinding_off() functions appeared in
SSLeay 0.9.0.
SEE ALSO
Functions: rsa(3), rand_ssl(3)RSA_blinding_on(3)