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#ifndef _IPXE_RDRAND_H
#define _IPXE_RDRAND_H
/** @file
*
* Hardware random number generator
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdint.h>
#include <ipxe/drbg.h>
#ifdef ENTROPY_RDRAND
#define ENTROPY_PREFIX_rdrand
#else
#define ENTROPY_PREFIX_rdrand __rdrand_
#endif
/**
* min-entropy per sample
*
* @ret min_entropy min-entropy of each sample
*/
static inline __always_inline min_entropy_t
ENTROPY_INLINE ( rdrand, min_entropy_per_sample ) ( void ) {
/* Data returned by RDRAND is theoretically full entropy, up
* to a security strength of 128 bits.
*/
if ( DRBG_SECURITY_STRENGTH > 128 )
return 0;
return MIN_ENTROPY ( 8 * sizeof ( noise_sample_t ) );
}
#endif /* _IPXE_RDRAND_H */
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