diff options
Diffstat (limited to 'lib/crypto/src/crypto.erl')
| -rw-r--r-- | lib/crypto/src/crypto.erl | 54 |
1 files changed, 53 insertions, 1 deletions
diff --git a/lib/crypto/src/crypto.erl b/lib/crypto/src/crypto.erl index d322765dff..1287ec6176 100644 --- a/lib/crypto/src/crypto.erl +++ b/lib/crypto/src/crypto.erl @@ -30,6 +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_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]). @@ -45,6 +51,9 @@ %% 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(). @@ -286,9 +295,11 @@ 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(). @@ -300,6 +311,46 @@ strong_rand_bytes(Bytes) -> strong_rand_bytes_nif(_Bytes) -> ?nif_stub. +rand_seed() -> + rand:seed(rand_seed_s()). + +rand_seed_s() -> + {#{ type => ?MODULE, + max => infinity, + 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}, + 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}. + +rand_plugin_jump(State) -> + 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 -> @@ -328,6 +379,7 @@ rand_uniform_pos(_,_) -> rand_uniform_nif(_From,_To) -> ?nif_stub. + -spec rand_seed(binary()) -> ok. rand_seed(Seed) -> rand_seed_nif(Seed). |