1 files changed, 32 insertions, 0 deletions
diff --git a/src/basic/random-util.h b/src/basic/random-util.h
new file mode 100644
index 0000000..b1a4d10
--- /dev/null
+++ b/src/basic/random-util.h
@@ -0,0 +1,32 @@
+/* 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)
+#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);