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-rw-r--r--src/basic/random-util.h31
1 files changed, 31 insertions, 0 deletions
diff --git a/src/basic/random-util.h b/src/basic/random-util.h
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+++ b/src/basic/random-util.h
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.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. */
+
+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)
+
+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);