tor

commit cf93d352095d252baf4cba07e51cb9a84ef8d9de
parent 9841e7173d7bad5aca0ceb529d31000e8a852089
Author: David Goulet <dgoulet@torproject.org>
Date:   Tue, 15 Mar 2022 14:00:00 -0400

crypto: Clarifying comment for the random hostname calculation

Closes #40520

Signed-off-by: David Goulet <dgoulet@torproject.org>

Diffstat:
M
src/lib/crypt_ops/crypto_rand.c
 | 
2
++

1 file changed, 2 insertions(+), 0 deletions(-)
diff --git a/src/lib/crypt_ops/crypto_rand.c b/src/lib/crypt_ops/crypto_rand.c
@@ -568,6 +568,8 @@ crypto_random_hostname(int min_rand_len, int max_rand_len, const char *prefix,
   prefixlen = strlen(prefix);
   resultlen = prefixlen + strlen(suffix) + randlen + 16;
 
+  /* (x+(n-1))/n is an idiom for dividing x by n, rounding up to the nearest
+   * integer and thus why this construction. */
   rand_bytes_len = ((randlen*5)+7)/8;
   if (rand_bytes_len % 5)
     rand_bytes_len += 5 - (rand_bytes_len%5);