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secure_random.ex's Issues

UUID generated is not version 4

I noticed that the UUID being generated isn't following the UUID v4 schema.

This algorithm sets the version number (4 bits) as well as two reserved bits. All other bits (the remaining 122 bits) are set using a random or pseudorandom data source. Version 4 UUIDs have the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where x is any hexadecimal digit and y is one of 8, 9, A, or B (e.g., f47ac10b-58cc-4372-a567-0e02b2c3d479).

For a conformant UUID v4 implementation, see the generate function in https://github.com/elixir-lang/ecto/blob/master/lib/ecto/uuid.ex

Length of returned hex string is not constant

When I execute SecureRandom.hex(12) multiple times, it returns quite often Strings with a length of 23 characters instead of 24 characters. I think this is not the expected behavior, as the Ruby counterpart returns strings with a constant size of the expected 24 characters.

iex(1)> SecureRandom.hex(12) |> String.length
24
iex(2)> SecureRandom.hex(12) |> String.length
24
iex(3)> SecureRandom.hex(12) |> String.length
24
iex(4)> SecureRandom.hex(12) |> String.length
23
iex(5)> SecureRandom.hex(12) |> String.length
24

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