diff --git a/src/apps/monero/xmr/crypto.py b/src/apps/monero/xmr/crypto.py
index c9c0c8eb5..8f96981e9 100644
--- a/src/apps/monero/xmr/crypto.py
+++ b/src/apps/monero/xmr/crypto.py
@@ -46,6 +46,14 @@ def keccak_hash(inp):
     return tcry.xmr_fast_hash(inp)
 
 
+def keccak_hash_into(r, inp):
+    """
+    Hashesh input in one call
+    :return:
+    """
+    return tcry.xmr_fast_hash(r,inp)
+
+
 def keccak_2hash(inp):
     """
     Keccak double hashing