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authorRaimo Niskanen <raimo@erlang.org>2017-03-21 16:36:33 +0100
committerRaimo Niskanen <raimo@erlang.org>2017-04-21 11:21:09 +0200
commit437555fd6c495915773b0f9ade7aad3fd0a73a1b (patch)
tree5be81ac9dc7d71235fed32f198ea3f702655cbb0 /lib/crypto
parent39c12050644c27883d679f11bb83142e6c1824ad (diff)
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Implement Xoroshiro116+ and improve statisticals
Implement Xoroshiro116+ as 'exrop' with fixes. Deprecate all old algorithms but reincarnate 'exs1024' as 'exs1024s' and 'exsplus' as 'exsp' with fixes. Fixes: * Avoid skew for uniform integers caused by using a simple 'rem' operation for range confinement. Correctness requires retry with new random value for an unfortunate first value. * Implement a correct algorithm that collects enough random bits for ranges larger than the generator's precision. * Fix uniform density for floats by acquiring 53 bits then multiplying with 2.0^(-53) which produces floats on the form N * 2.0^(-53).
Diffstat (limited to 'lib/crypto')
-rw-r--r--lib/crypto/src/crypto.erl8
1 files changed, 2 insertions, 6 deletions
diff --git a/lib/crypto/src/crypto.erl b/lib/crypto/src/crypto.erl
index 1287ec6176..765998b85d 100644
--- a/lib/crypto/src/crypto.erl
+++ b/lib/crypto/src/crypto.erl
@@ -35,7 +35,6 @@
-export([rand_plugin_next/1]).
-export([rand_plugin_uniform/1]).
-export([rand_plugin_uniform/2]).
--export([rand_plugin_jump/1]).
-export([rand_uniform/2]).
-export([block_encrypt/3, block_decrypt/3, block_encrypt/4, block_decrypt/4]).
-export([next_iv/2, next_iv/3]).
@@ -316,11 +315,10 @@ rand_seed() ->
rand_seed_s() ->
{#{ type => ?MODULE,
- max => infinity,
+ bits => 64,
next => fun ?MODULE:rand_plugin_next/1,
uniform => fun ?MODULE:rand_plugin_uniform/1,
- uniform_n => fun ?MODULE:rand_plugin_uniform/2,
- jump => fun ?MODULE:rand_plugin_jump/1},
+ uniform_n => fun ?MODULE:rand_plugin_uniform/2},
no_seed}.
rand_plugin_next(Seed) ->
@@ -332,8 +330,6 @@ rand_plugin_uniform(State) ->
rand_plugin_uniform(Max, State) ->
{bytes_to_integer(strong_rand_range(Max)) + 1, State}.
-rand_plugin_jump(State) ->
- State.
strong_rand_range(Range) when is_integer(Range), Range > 0 ->
BinRange = int_to_bin(Range),