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Add a note to Random.urandom

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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
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mame 2017-09-09 15:19:19 +00:00
parent 86d76173de
commit 7451ec065c
1 changed files with 3 additions and 1 deletions
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random.c
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@ -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