Name

RSA_blinding_on, RSA_blinding_off  — protect the RSA operation from timing attacks

Library

libcrypto.lib

Synopsis

#include <openssl/rsa.h>

int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);

void RSA_blinding_off(RSA *rsa);

Detailed 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(), rand()

History

RSA_blinding_on() and RSA_blinding_off() appeared in SSLeay 0.9.0.

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