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- =pod
- =head1 NAME
- RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks
- =head1 SYNOPSIS
- #include <openssl/rsa.h>
- 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<rsa> and generates a
- random blinding factor. B<ctx> is B<NULL> or a pre-allocated and
- initialized B<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.
- =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<rsa(3)|rsa(3)>, L<rand(3)|rand(3)>
- =head1 HISTORY
- RSA_blinding_on() and RSA_blinding_off() appeared in SSLeay 0.9.0.
- =cut
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