blockdev-util: add correct API for detecting if block device has partition scanning...

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

diff --git a/src/basic/random-util.h b/src/basic/random-util.h
index c829da0840b8e97dfd5483d99bc20ea84691294a..7824ffacebb9255ac81783b5866acc6afb6600e0 100644 (file)
--- a/src/basic/random-util.h
+++ b/src/basic/random-util.h
@@ -1,17 +1,22 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
-/***
-  Copyright 2010 Lennart Poettering
-***/
-
 #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);
+typedef enum RandomFlags {
+        RANDOM_EXTEND_WITH_PSEUDO = 1 << 0, /* If we can't get enough genuine randomness, but some, fill up the rest with pseudo-randomness */
+        RANDOM_BLOCK              = 1 << 1, /* Rather block than return crap randomness (only if the kernel supports that) */
+        RANDOM_MAY_FAIL           = 1 << 2, /* If we can't get any randomness at all, return early with -ENODATA */
+        RANDOM_ALLOW_RDRAND       = 1 << 3, /* Allow usage of the CPU RNG */
+        RANDOM_ALLOW_INSECURE     = 1 << 4, /* Allow usage of GRND_INSECURE flag to kernel's getrandom() API */
+} RandomFlags;
+
+int genuine_random_bytes(void *p, size_t n, RandomFlags flags); /* returns "genuine" randomness, optionally filled up with pseudo random, if not enough is available */
+void pseudo_random_bytes(void *p, size_t n);                    /* returns only pseudo-randommess (but possibly seeded from something better) */
+void random_bytes(void *p, size_t n);                           /* returns genuine randomness if cheaply available, and pseudo randomness if not. */
+
 void initialize_srand(void);
 
 static inline uint64_t random_u64(void) {
@@ -25,3 +30,13 @@ static inline uint32_t random_u32(void) {
         random_bytes(&u, sizeof(u));
         return u;
 }
+
+int rdrand(unsigned long *ret);
+
+/* Some limits on the pool sizes when we deal with the kernel random pool */
+#define RANDOM_POOL_SIZE_MIN 512U
+#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);