util: introduce memcmp_safe()

[thirdparty/systemd.git] / src / basic / random-util.h

/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

int acquire_random_bytes(void *p, size_t n, bool high_quality_required);
void pseudorandom_bytes(void *p, size_t n);
void random_bytes(void *p, size_t n);
void initialize_srand(void);

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;
}