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-rw-r--r--lib/ssl/src/ssl.erl19
-rw-r--r--lib/ssl/src/ssl_cipher.erl2
-rw-r--r--lib/ssl/src/ssl_connection.erl2
3 files changed, 20 insertions, 3 deletions
diff --git a/lib/ssl/src/ssl.erl b/lib/ssl/src/ssl.erl
index 4372a147fa..40d933a256 100644
--- a/lib/ssl/src/ssl.erl
+++ b/lib/ssl/src/ssl.erl
@@ -31,7 +31,7 @@
controlling_process/2, listen/2, pid/1, peername/1, peercert/1,
recv/2, recv/3, send/2, getopts/2, setopts/2, sockname/1,
versions/0, session_info/1, format_error/1,
- renegotiate/1, prf/5, clear_pem_cache/0]).
+ renegotiate/1, prf/5, clear_pem_cache/0, random_bytes/1]).
-deprecated({pid, 1, next_major_release}).
@@ -484,6 +484,23 @@ format_error(Error) ->
Other
end.
+%%--------------------------------------------------------------------
+-spec random_bytes(integer()) -> binary().
+
+%%
+%% Description: Generates cryptographically secure random sequence if possible
+%% fallbacks on pseudo random function
+%%--------------------------------------------------------------------
+random_bytes(N) ->
+ try crypto:strong_rand_bytes(N) of
+ RandBytes ->
+ RandBytes
+ catch
+ error:low_entropy ->
+ crypto:rand_bytes(N)
+ end.
+
+
%%%--------------------------------------------------------------
%%% Internal functions
%%%--------------------------------------------------------------------
diff --git a/lib/ssl/src/ssl_cipher.erl b/lib/ssl/src/ssl_cipher.erl
index 358972f522..80df8fd5cb 100644
--- a/lib/ssl/src/ssl_cipher.erl
+++ b/lib/ssl/src/ssl_cipher.erl
@@ -690,7 +690,7 @@ get_padding_aux(BlockSize, PadLength) ->
random_iv(IV) ->
IVSz = byte_size(IV),
- crypto:rand_bytes(IVSz).
+ ssl:random_bytes(IVSz).
next_iv(Bin, IV) ->
BinSz = byte_size(Bin),
diff --git a/lib/ssl/src/ssl_connection.erl b/lib/ssl/src/ssl_connection.erl
index f83341dee7..4954f5d668 100644
--- a/lib/ssl/src/ssl_connection.erl
+++ b/lib/ssl/src/ssl_connection.erl
@@ -2310,7 +2310,7 @@ handle_unexpected_message(Msg, Info, #state{negotiated_version = Version} = Stat
{stop, normal, State}.
make_premaster_secret({MajVer, MinVer}, rsa) ->
- Rand = crypto:rand_bytes(?NUM_OF_PREMASTERSECRET_BYTES-2),
+ Rand = ssl:random_bytes(?NUM_OF_PREMASTERSECRET_BYTES-2),
<<?BYTE(MajVer), ?BYTE(MinVer), Rand/binary>>;
make_premaster_secret(_, _) ->
undefined.