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#ifndef _IPXE_NULL_ENTROPY_H
#define _IPXE_NULL_ENTROPY_H
/** @file
*
* Nonexistent entropy source
*
* This source provides no entropy and must NOT be used in a
* security-sensitive environment.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#ifdef ENTROPY_NULL
#define ENTROPY_PREFIX_null
#else
#define ENTROPY_PREFIX_null __null_
#endif
static inline __always_inline int
ENTROPY_INLINE ( null, entropy_enable ) ( void ) {
/* Do nothing */
return 0;
}
static inline __always_inline void
ENTROPY_INLINE ( null, entropy_disable ) ( void ) {
/* Do nothing */
}
static inline __always_inline double
ENTROPY_INLINE ( null, min_entropy_per_sample ) ( void ) {
/* Actual amount of min-entropy is zero. To avoid
* division-by-zero errors and to allow compilation of
* entropy-consuming code, pretend to have 1 bit of entropy in
* each sample.
*/
return 1.0;
}
static inline __always_inline int
ENTROPY_INLINE ( null, get_noise ) ( noise_sample_t *noise ) {
/* All sample values are constant */
*noise = 0x01;
return 0;
}
#endif /* _IPXE_NULL_ENTROPY_H */
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