mirror of
https://github.com/morgan9e/systemd
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4d6222b6a4
Just a simple helper that allocates some memory, initializes it randomly, and places this in a struct iovec.
35 lines
1.0 KiB
C
35 lines
1.0 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <sys/uio.h>
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void random_bytes(void *p, size_t n); /* Returns random bytes suitable for most uses, but may be insecure sometimes. */
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int crypto_random_bytes(void *p, size_t n); /* Returns secure random bytes after waiting for the RNG to initialize. */
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int crypto_random_bytes_allocate_iovec(size_t n, struct iovec *ret);
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static inline uint64_t random_u64(void) {
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uint64_t u;
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random_bytes(&u, sizeof(u));
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return u;
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}
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static inline uint32_t random_u32(void) {
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uint32_t u;
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random_bytes(&u, sizeof(u));
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return u;
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}
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/* Some limits on the pool sizes when we deal with the kernel random pool */
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#define RANDOM_POOL_SIZE_MIN 32U
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#define RANDOM_POOL_SIZE_MAX (10U*1024U*1024U)
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#define RANDOM_EFI_SEED_SIZE 32U
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size_t random_pool_size(void);
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int random_write_entropy(int fd, const void *seed, size_t size, bool credit);
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uint64_t random_u64_range(uint64_t max);
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