X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fcrypto.h;h=ac96ea88e1a676b4bdc902f5641709b7b4f41081;hb=0fe69908838248c28624beb540257892db6bdcbd;hp=74bab1b0a858b71bc4668a75f8d09e74afe600b4;hpb=42d2dff33306beae8ddbd9cc991ad80f135950a6;p=tinc

diff --git a/src/crypto.h b/src/crypto.h
index 74bab1b0..ac96ea88 100644
--- a/src/crypto.h
+++ b/src/crypto.h
@@ -1,6 +1,8 @@
 #ifndef TINC_CRYPTO_H
 #define TINC_CRYPTO_H
 
+#include "system.h"
+
 /*
     crypto.h -- header for crypto.c
     Copyright (C) 2007-2013 Guus Sliepen <guus@tinc-vpn.org>
@@ -21,7 +23,20 @@
 */
 
 extern void crypto_init(void);
-extern void crypto_exit(void);
-extern void randomize(void *buf, size_t buflen);
+extern uint64_t xoshiro(void);
+extern void prng_init(void);
+extern void prng_randomize(void *buf, size_t buflen);
+
+static inline uint32_t prng(uint32_t limit) {
+	uint64_t bins = UINT64_MAX / limit;
+	uint64_t reject_after = bins * limit;
+	uint64_t value;
+
+	do {
+		value = xoshiro();
+	} while(value >= reject_after);
+
+	return value / bins;
+}
 
 #endif