X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fcrypto.h;h=9fc4156c82a3aaf0e65dedefb453d3ece318242c;hb=6debc6c79ba385d35f646e0958f84ace5b8f4b4d;hp=4c7d23bfa2dca65047ab216447be53aa194b216d;hpb=2c6b2d70e6640f39563ad7bb0aa0ba87f883848c;p=tinc

diff --git a/src/crypto.h b/src/crypto.h
index 4c7d23bf..9fc4156c 100644
--- a/src/crypto.h
+++ b/src/crypto.h
@@ -24,6 +24,21 @@
 
 extern void crypto_init(void);
 extern void crypto_exit(void);
+extern uint64_t xoshiro(void);
+extern void prng_init(void);
+extern void prng_randomize(void *buf, size_t buflen);
 extern void 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