From 7451ec065cc09758a49bbbf696b57da23e7f83ea Mon Sep 17 00:00:00 2001 From: mame Date: Sat, 9 Sep 2017 15:19:19 +0000 Subject: [PATCH] Add a note to Random.urandom The method may return nil for some reasons. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59803 b2dd03c8-39d4-4d8f-98ff-823fe69b080e --- random.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/random.c b/random.c index 8ea28a5792..82a51ccb6d 100644 --- a/random.c +++ b/random.c @@ -606,8 +606,10 @@ random_seed(void) * call-seq: Random.urandom(size) -> string * * Returns a string, using platform providing features. - * Returned value expected to be a cryptographically secure + * Returned value is expected to be a cryptographically secure * pseudo-random number in binary form. + * This method returns nil if the feature provided by platform + * failed to prepare the result. * * In 2017, Linux manpage random(7) writes that "no cryptographic * primitive available today can hope to promise more than 256 bits of