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-rw-r--r--lib/crypto/c_src/crypto.c23
-rw-r--r--lib/crypto/doc/src/crypto.xml46
-rw-r--r--lib/crypto/src/crypto.erl54
-rw-r--r--lib/crypto/test/crypto_SUITE.erl110
4 files changed, 227 insertions, 6 deletions
diff --git a/lib/crypto/c_src/crypto.c b/lib/crypto/c_src/crypto.c
index b2f31870b9..b8ef08410c 100644
--- a/lib/crypto/c_src/crypto.c
+++ b/lib/crypto/c_src/crypto.c
@@ -429,6 +429,7 @@ static ERL_NIF_TERM aes_ige_crypt_nif(ErlNifEnv* env, int argc, const ERL_NIF_TE
static ERL_NIF_TERM aes_ctr_stream_init(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM aes_ctr_stream_encrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM strong_rand_bytes_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM strong_rand_range_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM rand_uniform_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM mod_exp_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM dss_verify_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
@@ -501,6 +502,7 @@ static ErlNifFunc nif_funcs[] = {
{"aes_ctr_stream_encrypt", 2, aes_ctr_stream_encrypt},
{"aes_ctr_stream_decrypt", 2, aes_ctr_stream_encrypt},
{"strong_rand_bytes_nif", 1, strong_rand_bytes_nif},
+ {"strong_rand_range_nif", 1, strong_rand_range_nif},
{"rand_uniform_nif", 2, rand_uniform_nif},
{"mod_exp_nif", 4, mod_exp_nif},
{"dss_verify_nif", 4, dss_verify_nif},
@@ -2331,6 +2333,27 @@ static ERL_NIF_TERM bin_from_bn(ErlNifEnv* env, const BIGNUM *bn)
return term;
}
+static ERL_NIF_TERM strong_rand_range_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Range) */
+ BIGNUM *bn_range, *bn_rand;
+ ERL_NIF_TERM ret;
+
+ if(!get_bn_from_bin(env, argv[0], &bn_range)) {
+ return enif_make_badarg(env);
+ }
+
+ bn_rand = BN_new();
+ if (BN_rand_range(bn_rand, bn_range) != 1) {
+ ret = atom_false;
+ }
+ else {
+ ret = bin_from_bn(env, bn_rand);
+ }
+ BN_free(bn_rand);
+ BN_free(bn_range);
+ return ret;
+}
+
static ERL_NIF_TERM rand_uniform_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Lo,Hi) */
BIGNUM *bn_from = NULL, *bn_to, *bn_rand;
diff --git a/lib/crypto/doc/src/crypto.xml b/lib/crypto/doc/src/crypto.xml
index d0deaceaaf..552d95d7dc 100644
--- a/lib/crypto/doc/src/crypto.xml
+++ b/lib/crypto/doc/src/crypto.xml
@@ -658,10 +658,11 @@
</type>
<desc>
<p>Set the seed for PRNG to the given binary. This calls the
- RAND_seed function from openssl. Only use this if the system
- you are running on does not have enough "randomness" built in.
- Normally this is when <seealso marker="#strong_rand_bytes/1">
- strong_rand_bytes/1</seealso> returns <c>low_entropy</c></p>
+ RAND_seed function from openssl. Only use this if the system
+ you are running on does not have enough "randomness" built in.
+ Normally this is when
+ <seealso marker="#strong_rand_bytes/1">strong_rand_bytes/1</seealso>
+ throws <c>low_entropy</c></p>
</desc>
</func>
@@ -728,6 +729,43 @@
failed due to lack of secure "randomness".</p>
</desc>
</func>
+
+ <func>
+ <name>rand_seed() -> rand:state()</name>
+ <fsummary>Strong random number generation plugin state</fsummary>
+ <desc>
+ <p>
+ Creates state object for
+ <seealso marker="stdlib:rand">random number generation</seealso>,
+ in order to generate cryptographically strong random numbers
+ (based on OpenSSL's <c>BN_rand_range</c>),
+ and saves it on process dictionary before returning it as well.
+ See also
+ <seealso marker="stdlib:rand#seed-1">rand:seed/1</seealso>.
+ </p>
+ <p><em>Example</em></p>
+ <pre>
+_ = crypto:rand_seed(),
+_IntegerValue = rand:uniform(42), % [1; 42]
+_FloatValue = rand:uniform(). % [0.0; 1.0[</pre>
+ </desc>
+ </func>
+
+ <func>
+ <name>rand_seed_s() -> rand:state()</name>
+ <fsummary>Strong random number generation plugin state</fsummary>
+ <desc>
+ <p>
+ Creates state object for
+ <seealso marker="stdlib:rand">random number generation</seealso>,
+ in order to generate cryptographically strongly random numbers
+ (based on OpenSSL's <c>BN_rand_range</c>).
+ See also
+ <seealso marker="stdlib:rand#seed_s-1">rand:seed_s/1</seealso>.
+ </p>
+ </desc>
+ </func>
+
<func>
<name>stream_init(Type, Key) -> State</name>
<fsummary></fsummary>
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).
diff --git a/lib/crypto/test/crypto_SUITE.erl b/lib/crypto/test/crypto_SUITE.erl
index 1d7037d003..1b7456af18 100644
--- a/lib/crypto/test/crypto_SUITE.erl
+++ b/lib/crypto/test/crypto_SUITE.erl
@@ -36,7 +36,9 @@ all() ->
{group, non_fips},
mod_pow,
exor,
- rand_uniform
+ rand_uniform,
+ rand_plugin,
+ rand_plugin_s
].
groups() ->
@@ -486,6 +488,17 @@ rand_uniform(Config) when is_list(Config) ->
10 = byte_size(crypto:strong_rand_bytes(10)).
%%--------------------------------------------------------------------
+rand_plugin() ->
+ [{doc, "crypto rand plugin testing (implicit state / process dictionary)"}].
+rand_plugin(Config) when is_list(Config) ->
+ rand_plugin_aux(implicit_state).
+
+rand_plugin_s() ->
+ [{doc, "crypto rand plugin testing (explicit state)"}].
+rand_plugin_s(Config) when is_list(Config) ->
+ rand_plugin_aux(explicit_state).
+
+%%--------------------------------------------------------------------
%% Internal functions ------------------------------------------------
%%--------------------------------------------------------------------
hash(_, [], []) ->
@@ -951,6 +964,101 @@ crypto_rand_uniform(L,H) ->
ct:fail({"Not in interval", R1, L, H})
end.
+foldallmap(_Fun, AccN, []) ->
+ {true, AccN};
+foldallmap(Fun, AccN, [H|T]) ->
+ case Fun(H, AccN) of
+ {true, AccM} -> foldallmap(Fun, AccM, T);
+ {{false, Result}, AccM} -> {Result, AccM}
+ end.
+
+allmap(_Fun, []) ->
+ true;
+allmap(Fun, [H|T]) ->
+ case Fun(H) of
+ true -> allmap(Fun, T);
+ {false, Result} -> Result
+ end.
+
+rand_plugin_aux(StateType) ->
+ {Seeder, SeedExporter, FloatGenerator, IntegerGenerator} = rand_plugin_functions(StateType),
+ State0 = Seeder(),
+ {crypto, no_seed} = SeedExporter(State0),
+ {FloatTestResult, State1} = rand_plugin_aux_floats(State0, FloatGenerator),
+ case FloatTestResult of
+ true ->
+ {IntegerTestResult, _State2} = rand_plugin_aux_integers(State1, IntegerGenerator),
+ IntegerTestResult;
+ {false, _} ->
+ FloatTestResult
+ end.
+
+% returns {Seeder, SeedExporter, FloatGenerator, IntegerGenerator} with consistent signatures
+rand_plugin_functions(implicit_state) ->
+ {fun () -> crypto:rand_seed(), implicit_state end,
+ fun (implicit_state) -> rand:export_seed() end,
+ fun (implicit_state) -> {rand:uniform(), implicit_state} end,
+ fun (N, implicit_state) -> {rand:uniform(N), implicit_state} end};
+rand_plugin_functions(explicit_state) ->
+ {fun crypto:rand_seed_s/0,
+ fun rand:export_seed_s/1,
+ fun rand:uniform_s/1,
+ fun rand:uniform_s/2}.
+
+rand_plugin_aux_floats(State0, FloatGenerator) ->
+ {FloatSamples, State1} =
+ lists:mapfoldl(
+ fun (_, StateAcc) ->
+ FloatGenerator(StateAcc)
+ end,
+ State0,
+ lists:seq(1, 10000)),
+
+ {allmap(
+ fun (V) ->
+ (V >= 0.0 andalso V < 1.0)
+ orelse {false, ct:fail({"Float sample not in interval", V, 0.0, 1.0})}
+ end,
+ FloatSamples),
+ State1}.
+
+rand_plugin_aux_integers(State0, IntegerGenerator) ->
+ MaxIntegerCeiling = 1 bsl 32,
+ {IntegerCeilings, State1} =
+ lists:mapfoldl(
+ fun (_, StateAcc) ->
+ IntegerGenerator(MaxIntegerCeiling, StateAcc)
+ end,
+ State0,
+ lists:seq(1, 100)),
+
+ foldallmap(
+ fun (Ceiling, StateAcc) ->
+ case Ceiling >= 1 andalso Ceiling =< MaxIntegerCeiling of
+ false ->
+ {{false, ct:fail({"Integer ceiling not in interval",
+ Ceiling, 1, MaxIntegerCeiling})},
+ StateAcc};
+ true ->
+ foldallmap(
+ fun (_, SubStateAcc) ->
+ {Sample, NewSubStateAcc} = IntegerGenerator(Ceiling, SubStateAcc),
+ case Sample >= 1 andalso Sample =< Ceiling of
+ false ->
+ {{false, ct:fail({"Integer sample not in interval",
+ Sample, 1, Ceiling})},
+ NewSubStateAcc};
+ true ->
+ {true, NewSubStateAcc}
+ end
+ end,
+ StateAcc,
+ lists:seq(1, 100))
+ end
+ end,
+ State1,
+ IntegerCeilings).
+
%%--------------------------------------------------------------------
%% Test data ------------------------------------------------
%%--------------------------------------------------------------------
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-21 10:42:34 +0000