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.


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