bugfix missing byte swap for the create2 salt value (#272)

Found in https://github.com/paritytech/contract-issues/issues/45, thanks @albertov19 and @sekisamu --------- Signed-off-by: xermicus <cyrill@parity.io> Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>
2026-05-10 08:47:59 +00:00 · 2025-04-03 15:20:22 +02:00
parent 313c033261
commit dab29bc89b
5 changed files with 74 additions and 0 deletions
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.28;
+
+contract Predicted {
+    uint public salt;
+
+    constructor(uint _salt) {
+        salt = _salt;
+    }
+}
+
+contract AddressPredictor {
+    constructor(uint _salt, bytes memory _bytecode) payable {
+        address deployed = address(new Predicted{salt: bytes32(_salt)}(_salt));
+        address predicted = predictAddress(_salt, _bytecode);
+        assert(deployed == predicted);
+    }
+
+    function predictAddress(
+        uint _foo,
+        bytes memory _bytecode
+    ) public view returns (address predicted) {
+        bytes32 addr = keccak256(
+            abi.encodePacked(
+                bytes1(0xff),
+                address(this),
+                bytes32(_foo),
+                keccak256(abi.encodePacked(_bytecode, abi.encode(_foo)))
+            )
+        );
+        predicted = address(uint160(uint(addr)));
+    }
+}