RSA_blinding_on(3)

     RSA_blinding_on(3)     0.9.6h (2000-02-24)     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.

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