fix TinySig

Author: minaminao

src/Curta/3_TinySig/Exploit.t.sol

@@ -41,10 +41,15 @@ contract ExploitTest is Test {
 }
 
 contract Exploit {
-    fallback(bytes calldata /* input */ ) external returns (bytes memory output) {
-        bytes32 h = hex"bd8dced7bc30310eaf6c4532178481e51b3234d90e4da270c3dcdf5aa694ce6b";
-        uint8 v = 27;
-        bytes32 r = hex"00000000000000000000003b78ce563f89a0ed9414f5aa28ad0d96d6795f9c63";
-        return abi.encode(h, v, r);
+    fallback(bytes calldata /* input */ ) external returns (bytes memory) {
+        assembly {
+            let ptr := mload(0x40)
+
+            mstore(ptr, 0xbd8dced7bc30310eaf6c4532178481e51b3234d90e4da270c3dcdf5aa694ce6b) // h
+            mstore(add(ptr, 0x20), 27) // v
+            mstore(add(ptr, 0x40), 0x3b78ce563f89a0ed9414f5aa28ad0d96d6795f9c63) // r
+
+            return(ptr, 96)
+        }
     }
 }