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authorRaimo Niskanen <[email protected]>2017-09-06 21:56:22 +0200
committerRaimo Niskanen <[email protected]>2017-09-06 22:07:37 +0200
commit2181428bcad2abb3265e796e0b84b10830c74a76 (patch)
treed6c6f2dd68784c9e18e71e3ce4c1cc76aec28ee3 /lib
parent040bdce67f88d833bfb59adae130a4ffb4c180f0 (diff)
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Implement crypto rand cache
Diffstat (limited to 'lib')
-rw-r--r--lib/crypto/src/crypto.erl28
1 files changed, 24 insertions, 4 deletions
diff --git a/lib/crypto/src/crypto.erl b/lib/crypto/src/crypto.erl
index d111525214..69c98c651f 100644
--- a/lib/crypto/src/crypto.erl
+++ b/lib/crypto/src/crypto.erl
@@ -30,11 +30,12 @@
-export([hmac/3, hmac/4, hmac_init/2, hmac_update/2, hmac_final/1, hmac_final_n/2]).
-export([cmac/3, cmac/4]).
-export([exor/2, strong_rand_bytes/1, mod_pow/3]).
--export([rand_seed/0]).
--export([rand_seed_s/0]).
+-export([rand_seed/0, rand_seed_alg/1]).
+-export([rand_seed_s/0, rand_seed_alg_s/1]).
-export([rand_plugin_next/1]).
-export([rand_plugin_uniform/1]).
-export([rand_plugin_uniform/2]).
+-export([rand_cache_plugin_next/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]).
@@ -299,6 +300,8 @@ stream_decrypt(State, Data0) ->
-spec strong_rand_bytes(non_neg_integer()) -> binary().
-spec rand_seed() -> rand:state().
-spec rand_seed_s() -> rand:state().
+-spec rand_seed_alg(Alg :: atom()) -> rand:state().
+-spec rand_seed_alg_s(Alg :: atom()) -> rand:state().
-spec rand_uniform(crypto_integer(), crypto_integer()) ->
crypto_integer().
@@ -314,12 +317,24 @@ rand_seed() ->
rand:seed(rand_seed_s()).
rand_seed_s() ->
+ rand_seed_alg_s(?MODULE).
+
+rand_seed_alg(Alg) ->
+ rand:seed(rand_seed_alg_s(Alg)).
+
+-define(CRYPTO_CACHE_BITS, 56).
+rand_seed_alg_s(?MODULE) ->
{#{ type => ?MODULE,
bits => 64,
next => fun ?MODULE:rand_plugin_next/1,
uniform => fun ?MODULE:rand_plugin_uniform/1,
uniform_n => fun ?MODULE:rand_plugin_uniform/2},
- no_seed}.
+ no_seed};
+rand_seed_alg_s(crypto_cache) ->
+ {#{ type => crypto_cache,
+ bits => ?CRYPTO_CACHE_BITS,
+ next => fun ?MODULE:rand_cache_plugin_next/1},
+ <<>>}.
rand_plugin_next(Seed) ->
{bytes_to_integer(strong_rand_range(1 bsl 64)), Seed}.
@@ -330,6 +345,11 @@ rand_plugin_uniform(State) ->
rand_plugin_uniform(Max, State) ->
{bytes_to_integer(strong_rand_range(Max)) + 1, State}.
+rand_cache_plugin_next(<<>>) ->
+ rand_cache_plugin_next(
+ strong_rand_bytes(?CRYPTO_CACHE_BITS * 16)); % Cache 16 * 8 words
+rand_cache_plugin_next(<<I:?CRYPTO_CACHE_BITS,Cache/binary>>) ->
+ {I, Cache}.
strong_rand_range(Range) when is_integer(Range), Range > 0 ->
BinRange = int_to_bin(Range),
@@ -377,7 +397,7 @@ rand_uniform_nif(_From,_To) -> ?nif_stub.
-spec rand_seed(binary()) -> ok.
-rand_seed(Seed) ->
+rand_seed(Seed) when is_binary(Seed) ->
rand_seed_nif(Seed).
rand_seed_nif(_Seed) -> ?nif_stub.