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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.

  The RSA_blinding_on() function turns blinding on for key rsa and generates
  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.

RETURN VALUES
  The RSA_blinding_on() function returns 1 on success, and 0 if an error
  occurred.

  The RSA_blinding_off() function returns no value.

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

SEE ALSO
  Functions: rsa(3), rand_ssl(3)

Index for Section 3

Alphabetical listing for R

Top of page