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-rw-r--r--lib/crypto/src/crypto.erl53
1 files changed, 52 insertions, 1 deletions
diff --git a/lib/crypto/src/crypto.erl b/lib/crypto/src/crypto.erl
index 631af62615..765998b85d 100644
--- a/lib/crypto/src/crypto.erl
+++ b/lib/crypto/src/crypto.erl
@@ -30,6 +30,11 @@
-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_plugin_next/1]).
+-export([rand_plugin_uniform/1]).
+-export([rand_plugin_uniform/2]).
-export([rand_uniform/2]).
-export([block_encrypt/3, block_decrypt/3, block_encrypt/4, block_decrypt/4]).
-export([next_iv/2, next_iv/3]).
@@ -40,9 +45,14 @@
-export([ec_curve/1, ec_curves/0]).
-export([rand_seed/1]).
+-deprecated({rand_uniform, 2, next_major_release}).
+
%% This should correspond to the similar macro in crypto.c
-define(MAX_BYTES_TO_NIF, 20000). %% Current value is: erlang:system_info(context_reductions) * 10
+%% Used by strong_rand_float/0
+-define(HALF_DBL_EPSILON, 1.1102230246251565e-16). % math:pow(2, -53)
+
%%-type ecdsa_digest_type() :: 'md5' | 'sha' | 'sha256' | 'sha384' | 'sha512'.
-type crypto_integer() :: binary() | integer().
%%-type ec_named_curve() :: atom().
@@ -54,6 +64,7 @@
%%-type ec_curve() :: ec_named_curve() | ec_curve_spec().
%%-type ec_key() :: {Curve :: ec_curve(), PrivKey :: binary() | undefined, PubKey :: ec_point() | undefined}.
+-compile(no_native).
-on_load(on_load/0).
-define(CRYPTO_NIF_VSN,302).
@@ -283,9 +294,11 @@ stream_decrypt(State, Data0) ->
stream_crypt(fun do_stream_decrypt/2, State, Data, erlang:byte_size(Data), MaxByts, []).
%%
-%% RAND - pseudo random numbers using RN_ functions in crypto lib
+%% RAND - pseudo random numbers using RN_ and BN_ functions in crypto lib
%%
-spec strong_rand_bytes(non_neg_integer()) -> binary().
+-spec rand_seed() -> rand:state().
+-spec rand_seed_s() -> rand:state().
-spec rand_uniform(crypto_integer(), crypto_integer()) ->
crypto_integer().
@@ -297,6 +310,43 @@ strong_rand_bytes(Bytes) ->
strong_rand_bytes_nif(_Bytes) -> ?nif_stub.
+rand_seed() ->
+ rand:seed(rand_seed_s()).
+
+rand_seed_s() ->
+ {#{ 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}.
+
+rand_plugin_next(Seed) ->
+ {bytes_to_integer(strong_rand_range(1 bsl 64)), Seed}.
+
+rand_plugin_uniform(State) ->
+ {strong_rand_float(), State}.
+
+rand_plugin_uniform(Max, State) ->
+ {bytes_to_integer(strong_rand_range(Max)) + 1, State}.
+
+
+strong_rand_range(Range) when is_integer(Range), Range > 0 ->
+ BinRange = int_to_bin(Range),
+ strong_rand_range(BinRange);
+strong_rand_range(BinRange) when is_binary(BinRange) ->
+ case strong_rand_range_nif(BinRange) of
+ false ->
+ erlang:error(low_entropy);
+ <<BinResult/binary>> ->
+ BinResult
+ end.
+strong_rand_range_nif(_BinRange) -> ?nif_stub.
+
+strong_rand_float() ->
+ WholeRange = strong_rand_range(1 bsl 53),
+ ?HALF_DBL_EPSILON * bytes_to_integer(WholeRange).
+
rand_uniform(From,To) when is_binary(From), is_binary(To) ->
case rand_uniform_nif(From,To) of
<<Len:32/integer, MSB, Rest/binary>> when MSB > 127 ->
@@ -325,6 +375,7 @@ rand_uniform_pos(_,_) ->
rand_uniform_nif(_From,_To) -> ?nif_stub.
+
-spec rand_seed(binary()) -> ok.
rand_seed(Seed) ->
rand_seed_nif(Seed).