xmr: range_sig allocation reordering, large chunks first

ph4r05 · Sep 27, 2018 · df0a1df · df0a1df
1 parent 63cddd5
commit df0a1df
Showing 1 changed file with 9 additions and 9 deletions.
diff --git a/src/apps/monero/xmr/ring_ct.py b/src/apps/monero/xmr/ring_ct.py
@@ -53,6 +53,15 @@ def verify_bp(bp_proof, amounts=None, masks=None):
 
 
 def prove_range_chunked(amount, last_mask=None):
+    # The large chunks allocated first to avoid potential memory fragmentation issues.
+    ai = bytearray(32 * 64)
+    alphai = bytearray(32 * 64)
+    Cis = bytearray(32 * 64)
+    s0s = bytearray(32 * 64)
+    s1s = bytearray(32 * 64)
+    buff = bytearray(32)
+    ee_bin = bytearray(32)
+
     a = crypto.sc_init(0)
     si = crypto.sc_init(0)
     c = crypto.sc_init(0)
@@ -67,15 +76,6 @@ def prove_range_chunked(amount, last_mask=None):
     Zero = crypto.identity()
     kck = crypto.get_keccak()
 
-    ai = bytearray(32 * 64)
-    alphai = bytearray(32 * 64)
-    buff = bytearray(32)
-
-    Cis = bytearray(32 * 64)
-    s0s = bytearray(32 * 64)
-    s1s = bytearray(32 * 64)
-    ee_bin = bytearray(32)
-
     for ii in range(64):
         crypto.random_scalar(tmp_ai)
         if last_mask is not None and ii == 63: