libkirk: fix buffer overflow.

hrydgard · Oct 13, 2020 · f7a1b7a · f7a1b7a
1 parent 9a9787e
commit f7a1b7a
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/ext/libkirk/ec.c b/ext/libkirk/ec.c
@@ -295,8 +295,8 @@ static void generate_ecdsa(u8 *outR, u8 *outS, u8 *k, u8 *hash)
 
   bn_from_mon(R, ec_N, 21);
   bn_from_mon(S, ec_N, 21);
-  memcpy(outR,R+1,0x20);
-  memcpy(outS,S+1,0x20);
+  memcpy(outR,R+1,20);
+  memcpy(outS,S+1,20);
 }
 
     // Signing =