tor

commit 97b9dfe3052f1fe3b14f47fc1326e235f96305b7
parent 208f04e9b8241569fe314f6d5cb65521c9b55d8b
Author: Nick Mathewson <nickm@torproject.org>
Date:   Wed, 20 Feb 2019 12:21:05 -0500

Add a convenience macro to get a fast one-in-n calculation

Diffstat:
M
src/lib/crypt_ops/crypto_rand.h
 | 
3
+++

1 file changed, 3 insertions(+), 0 deletions(-)
diff --git a/src/lib/crypt_ops/crypto_rand.h b/src/lib/crypt_ops/crypto_rand.h
@@ -68,6 +68,9 @@ unsigned crypto_fast_rng_get_uint(crypto_fast_rng_t *rng, unsigned limit);
 uint64_t crypto_fast_rng_get_uint64(crypto_fast_rng_t *rng, uint64_t limit);
 double crypto_fast_rng_get_double(crypto_fast_rng_t *rng);
 
+#define crypto_fast_rng_one_in_n(rng, n)        \
+  (0 == (crypto_fast_rng_get_uint((rng), (n))))
+
 crypto_fast_rng_t *get_thread_fast_rng(void);
 
 #ifdef CRYPTO_PRIVATE