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RSA_blinding_on(3)                  OpenSSL                 RSA_blinding_on(3)



NAME
       RSA_blinding_on, RSA_blinding_off - protect the RSA operation from
       timing attacks

LIBRARY
       libcrypto, -lcrypto

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
       openssl_rsa(3), openssl_rand(3)

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



1.0.1i                            2009-07-20                RSA_blinding_on(3)