/usr/man/cat.3/RSA_blinding_on.3

RSA_blinding_on(3)           OpenSSL           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.

1.0.2t               Last change: 2019-09-10                    1

See also RSA_blinding_off(3)