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jteich
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Sep 22, 2022
| # Generate a random key | ||
| def random_key(length=256) | ||
| _random_seed.unpack('H*')[0][0..((length/8)-1)] | ||
| _random_seed.unpack('H*')[0][0..((length/4)-1)] |
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The key as generated by _random_seed is a hex string. In a hex string, each character encodes 4 bits.
jteich
commented
Sep 22, 2022
| else | ||
| chars = ("a".."z").to_a + ("A".."Z").to_a + ("0".."9").to_a | ||
| (1..size).collect{|a| chars[rand(chars.size)] }.join | ||
| (1..size).collect{ rand(256).chr }.join |
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When using a modulo based upon a-z,A-Z,0-9 which comprises 62 characters, this effectively yields log2(62) (about 5.95) bits per character of randomness. rand(256) will yield a full 8 bits per character, inline with what OpenSSL::Random.random_bytes would return.
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