38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
#ifndef LIGHTNING_COMMON_PSEUDORAND_H
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#define LIGHTNING_COMMON_PSEUDORAND_H
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#include "config.h"
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#include <ccan/crypto/siphash24/siphash24.h>
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#include <stdint.h>
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#include <stdlib.h>
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/**
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* pseudorand - pseudo (guessable!) random number between 0 and max-1.
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*/
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#define pseudorand(max) ({static uint64_t offset; pseudorand_((max), &offset);})
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uint64_t pseudorand_(uint64_t max, uint64_t *offset);
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/**
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* pseudorand_u64 - pseudo (guessable!) random number between 0 and UINT64_MAX.
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*/
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#define pseudorand_u64() ({static uint64_t offset; pseudorand_u64_(&offset);})
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uint64_t pseudorand_u64_(uint64_t *offset);
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/**
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* pseudorand - pseudo (guessable!) random number between 0 (inclusive) and 1
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* (exclusive).
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*/
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#define pseudorand_double() ({static uint64_t offset; pseudorand_double_(&offset);})
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double pseudorand_double_(uint64_t *offset);
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/**
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* Get the siphash seed for hash tables.
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*/
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const struct siphash_seed *siphash_seed(void);
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/* Shuffle a tal array of type type. */
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#define tal_arr_randomize(arr, type) \
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tal_arr_randomize_((arr), sizeof(type) + 0*sizeof(arr == (type *)NULL))
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void tal_arr_randomize_(void *arr, size_t elemsize);
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#endif /* LIGHTNING_COMMON_PSEUDORAND_H */
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