1RSA_blinding_on(3)                  OpenSSL                 RSA_blinding_on(3)
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NAME

6       RSA_blinding_on, RSA_blinding_off - protect the RSA operation from
7       timing attacks
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SYNOPSIS

10        #include <openssl/rsa.h>
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12        int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
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14        void RSA_blinding_off(RSA *rsa);
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DESCRIPTION

17       RSA is vulnerable to timing attacks. In a setup where attackers can
18       measure the time of RSA decryption or signature operations, blinding
19       must be used to protect the RSA operation from that attack.
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21       RSA_blinding_on() turns blinding on for key rsa and generates a random
22       blinding factor. ctx is NULL or a pre-allocated and initialized BN_CTX.
23       The random number generator must be seeded prior to calling
24       RSA_blinding_on().
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26       RSA_blinding_off() turns blinding off and frees the memory used for the
27       blinding factor.
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RETURN VALUES

30       RSA_blinding_on() returns 1 on success, and 0 if an error occurred.
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32       RSA_blinding_off() returns no value.
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SEE ALSO

35       rsa(3), rand(3)
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HISTORY

38       RSA_blinding_on() and RSA_blinding_off() appeared in SSLeay 0.9.0.
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421.0.1e                            2013-02-11                RSA_blinding_on(3)