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-rw-r--r--lib/crypto/src/crypto.erl11
1 files changed, 10 insertions, 1 deletions
diff --git a/lib/crypto/src/crypto.erl b/lib/crypto/src/crypto.erl
index 862f3df0f8..e3b921f9fa 100644
--- a/lib/crypto/src/crypto.erl
+++ b/lib/crypto/src/crypto.erl
@@ -466,6 +466,13 @@ rand_uniform(From,To) when is_binary(From), is_binary(To) ->
Whatever
end;
rand_uniform(From,To) when is_integer(From),is_integer(To) ->
+ if From < 0 ->
+ rand_uniform_pos(0, To - From) + From;
+ true ->
+ rand_uniform_pos(From, To)
+ end.
+
+rand_uniform_pos(From,To) when From < To ->
BinFrom = mpint(From),
BinTo = mpint(To),
case rand_uniform(BinFrom, BinTo) of
@@ -473,7 +480,9 @@ rand_uniform(From,To) when is_integer(From),is_integer(To) ->
erlint(Result);
Other ->
Other
- end.
+ end;
+rand_uniform_pos(_,_) ->
+ error(badarg).
rand_uniform_nif(_From,_To) -> ?nif_stub.