1RSA_blinding_on(3)                  OpenSSL                 RSA_blinding_on(3)
2
3
4

NAME

6       RSA_blinding_on, RSA_blinding_off - protect the RSA operation from
7       timing attacks
8

SYNOPSIS

10        #include <openssl/rsa.h>
11
12        int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
13
14        void RSA_blinding_off(RSA *rsa);
15

DESCRIPTION

17       RSA is vulnerable to timing attacks. In a setup where attackers can
18       measure the time of RSA decryption or signature operations, blinding
19       must be used to protect the RSA operation from that attack.
20
21       RSA_blinding_on() turns blinding on for key rsa and generates a random
22       blinding factor. ctx is NULL or a pre-allocated and initialized BN_CTX.
23       The random number generator must be seeded prior to calling
24       RSA_blinding_on().
25
26       RSA_blinding_off() turns blinding off and frees the memory used for the
27       blinding factor.
28

RETURN VALUES

30       RSA_blinding_on() returns 1 on success, and 0 if an error occurred.
31
32       RSA_blinding_off() returns no value.
33

SEE ALSO

35       rsa(3), rand(3)
36

HISTORY

38       RSA_blinding_on() and RSA_blinding_off() appeared in SSLeay 0.9.0.
39
40
41
421.0.2o                            2020-01-28                RSA_blinding_on(3)