mirror of
https://github.com/sheumann/hush.git
synced 2024-10-31 19:04:47 +00:00
fb183076a3
function old new delta next_random 68 113 +45 change_random 103 121 +18 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
42 lines
871 B
C
42 lines
871 B
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* $RANDOM support.
|
|
*
|
|
* Copyright (C) 2009 Denys Vlasenko
|
|
*
|
|
* Licensed under GPLv2, see file LICENSE in this source tree.
|
|
*/
|
|
#ifndef SHELL_RANDOM_H
|
|
#define SHELL_RANDOM_H 1
|
|
|
|
PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
|
|
|
|
typedef struct random_t {
|
|
/* State of random number generators: */
|
|
|
|
/* Galois LFSR (fast but weak) */
|
|
int32_t galois_LFSR; /* must be signed! */
|
|
|
|
/* LCG (fast but weak) */
|
|
uint32_t LCG;
|
|
|
|
/* 64-bit xorshift (fast, moderate strength) */
|
|
uint32_t xs64_x;
|
|
uint32_t xs64_y;
|
|
} random_t;
|
|
|
|
#define UNINITED_RANDOM_T(rnd) \
|
|
((rnd)->galois_LFSR == 0)
|
|
|
|
#define INIT_RANDOM_T(rnd, nonzero, v) \
|
|
((rnd)->galois_LFSR = (rnd)->xs64_x = (nonzero), (rnd)->LCG = (rnd)->xs64_y = (v))
|
|
|
|
#define CLEAR_RANDOM_T(rnd) \
|
|
((rnd)->galois_LFSR = 0)
|
|
|
|
uint32_t next_random(random_t *rnd) FAST_FUNC;
|
|
|
|
POP_SAVED_FUNCTION_VISIBILITY
|
|
|
|
#endif
|