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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

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.

16/Aug/2000		      0.9.6				1

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