1 files changed, 17 insertions, 0 deletions
diff --git a/src/random.h b/src/random.h
index 664f030eba..0464bdce14 100644
--- a/src/random.h
+++ b/src/random.h
@@ -46,4 +46,21 @@ public:
     uint32_t Rw;
 };
 
+/* Number of random bytes returned by GetOSRand.
+ * When changing this constant make sure to change all call sites, and make
+ * sure that the underlying OS APIs for all platforms support the number.
+ * (many cap out at 256 bytes).
+ */
+static const ssize_t NUM_OS_RANDOM_BYTES = 32;
+
+/** Get 32 bytes of system entropy. Do not use this in application code: use
+ * GetStrongRandBytes instead.
+ */
+void GetOSRand(unsigned char *ent32);
+
+/** Check that OS randomness is available and returning the requested number
+ * of bytes.
+ */
+bool Random_SanityCheck();
+
 #endif // BITCOIN_RANDOM_H