NAME    [Toc]    [Back]

       RSA_blinding_on, RSA_blinding_off - protect the RSA operation
 from timing attacks

LIBRARY    [Toc]    [Back]

       libcrypto, -lcrypto

SYNOPSIS    [Toc]    [Back]

        #include <openssl/rsa.h>

        int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);

        void RSA_blinding_off(RSA *rsa);

DESCRIPTION    [Toc]    [Back]

       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    [Toc]    [Back]

       RSA_blinding_on() returns 1 on success, and 0 if an error
       occurred.

       RSA_blinding_off() returns no value.

SEE ALSO    [Toc]    [Back]

       openssl_rsa(3), openssl_rand(3)

HISTORY    [Toc]    [Back]

       RSA_blinding_on() and RSA_blinding_off() appeared in
       SSLeay 0.9.0.



2000-07-22                    0.9.6g           RSA_blinding_on(3)