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| author | Raimo Niskanen <[email protected]> | 2017-03-21 16:36:33 +0100 |
|---|---|---|
| committer | Raimo Niskanen <[email protected]> | 2017-04-21 11:21:09 +0200 |
| commit | 437555fd6c495915773b0f9ade7aad3fd0a73a1b (patch) | |
| tree | 5be81ac9dc7d71235fed32f198ea3f702655cbb0 /lib/crypto | |
| parent | 39c12050644c27883d679f11bb83142e6c1824ad (diff) | |
| download | otp-437555fd6c495915773b0f9ade7aad3fd0a73a1b.tar.gz otp-437555fd6c495915773b0f9ade7aad3fd0a73a1b.tar.bz2 otp-437555fd6c495915773b0f9ade7aad3fd0a73a1b.zip | |
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.erl | 8 |
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), |