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=pod
=head1 NAME
RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks
=head1 SYNOPSIS
#include
int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
void RSA_blinding_off(RSA *rsa);
=head1 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 B and generates a
random blinding factor. B is B or a pre-allocated and
initialized B. 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.
=head1 RETURN VALUES
RSA_blinding_on() returns 1 on success, and 0 if an error occurred.
RSA_blinding_off() returns no value.
=head1 SEE ALSO
L, L
=head1 HISTORY
RSA_blinding_on() and RSA_blinding_off() appeared in SSLeay 0.9.0.
=cut