RSA_blinding_on man page on DigitalUNIX

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RSA_blinding_on(3)					    RSA_blinding_on(3)

       RSA_blinding_on, RSA_blinding_off - Protect the RSA operation from tim‐
       ing attacks

       #include <openssl/rsa.h>

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

       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.

       The RSA_blinding_on() function turns blinding on for key rsa and gener‐
       ates  a	random blinding factor. The ctx is NULL or a pre-allocated and
       initialized BN_CTX. The random number generator must be seeded prior to
       calling the RSA_blinding_on() function.

       The RSA_blinding_off() function turns blinding off and frees the memory
       used for the blinding factor.

       The RSA_blinding_on() function returns 1 on success, and 0 if an	 error

       The RSA_blinding_off() function returns no value.

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

       Functions: rsa(3), rand_ssl(3)


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