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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <sys/uio.h>
void random_bytes(void *p, size_t n); /* Returns random bytes suitable for most uses, but may be insecure sometimes. */
int crypto_random_bytes(void *p, size_t n); /* Returns secure random bytes after waiting for the RNG to initialize. */
int crypto_random_bytes_allocate_iovec(size_t n, struct iovec *ret);
static inline uint64_t random_u64(void) {
uint64_t u;
random_bytes(&u, sizeof(u));
return u;
}
static inline uint32_t random_u32(void) {
uint32_t u;
random_bytes(&u, sizeof(u));
return u;
}
/* Some limits on the pool sizes when we deal with the kernel random pool */
#define RANDOM_POOL_SIZE_MIN 32U
#define RANDOM_POOL_SIZE_MAX (10U*1024U*1024U)
#define RANDOM_EFI_SEED_SIZE 32U
size_t random_pool_size(void);
int random_write_entropy(int fd, const void *seed, size_t size, bool credit);
uint64_t random_u64_range(uint64_t max);
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