RSpec
Ruby on Rails
Ruby
method
urandom
Ruby latest stable (v2_5_5)
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0 notes -
Class: Random
- 1_8_6_287
- 1_8_7_72
- 1_8_7_330
- 1_9_1_378
- 1_9_2_180
- 1_9_3_125
- 1_9_3_392
- 2_1_10
- 2_2_9
- 2_4_6
- 2_5_5 (0)
- 2_6_3 (0)
- What's this?
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bytes
(>= v2_6_3)
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new
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new_seed
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rand
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raw_seed
(<= v2_4_6)
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srand
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urandom
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==
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bytes
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initialize_copy
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left
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marshal_dump
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marshal_load
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rand
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seed
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state
= private
= protected
urandom(p1)
public
Returns a string, using platform providing features. Returned value is expected to be a cryptographically secure pseudo-random number in binary form. This method raises a RuntimeError 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 security”. So it might be questionable to pass size > 32 to this method.
Random.urandom(8) #=> "\x78\x41\xBA\xAF\x7D\xEA\xD8\xEA"
