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A really random source for the uuids #4

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Merged
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Mar 28, 2013
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A really random source for the uuids #4

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Changed random number generator to crypto:rand_uniform(), so that the… 
… uuids are not always the same sequence. I guess that is the idea of a uuid?
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@shoehn
shoehn committed Oct 15, 2011
commit f3b5f4d5a04eb6f076f48cb8da309475efdae875
3 changes: 2 additions & 1 deletion uuid.erl
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Expand Up @@ -34,7 +34,8 @@

% Generates a random binary UUID.
v4() ->
v4(random:uniform(round(math:pow(2, 48))) - 1, random:uniform(round(math:pow(2, 12))) - 1, random:uniform(round(math:pow(2, 32))) - 1, random:uniform(round(math:pow(2, 30))) - 1).
v4(crypto:rand_uniform(1, round(math:pow(2, 48))) - 1, crypto:rand_uniform(1, round(math:pow(2, 12))) - 1, crypto:rand_uniform(1, round(math:pow(2, 32))) - 1, crypto:rand_uniform(1, round(math:pow(2, 30))) - 1).

v4(R1, R2, R3, R4) ->
<<R1:48, 4:4, R2:12, 2:2, R3:32, R4: 30>>.

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