Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- AxelarAuthWeighted
- Optimization enabled
- true
- Compiler version
- v0.8.9+commit.e5eed63a
- Optimization runs
- 1000
- EVM Version
- default
- Verified at
- 2022-12-13T22:22:59.868156Z
Constructor Arguments
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Arg [0] (bytes[]) : 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Contract source code
// Source: contracts/auth/AxelarAuthWeighted.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;
// File contracts/interfaces/IOwnable.sol
interface IOwnable {
error NotOwner();
error InvalidOwner();
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
function owner() external view returns (address);
function transferOwnership(address newOwner) external;
}
// File contracts/interfaces/IAxelarAuth.sol
interface IAxelarAuth is IOwnable {
function validateProof(bytes32 messageHash, bytes calldata proof) external returns (bool currentOperators);
function transferOperatorship(bytes calldata params) external;
}
// File contracts/interfaces/IAxelarAuthWeighted.sol
interface IAxelarAuthWeighted is IAxelarAuth {
error InvalidOperators();
error InvalidThreshold();
error DuplicateOperators();
error MalformedSigners();
error LowSignaturesWeight();
error InvalidWeights();
event OperatorshipTransferred(address[] newOperators, uint256[] newWeights, uint256 newThreshold);
function currentEpoch() external view returns (uint256);
function hashForEpoch(uint256 epoch) external view returns (bytes32);
function epochForHash(bytes32 hash) external view returns (uint256);
}
// File contracts/ECDSA.sol
/**
* @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
*
* These functions can be used to verify that a message was signed by the holder
* of the private keys of a given address.
*/
library ECDSA {
error InvalidSignatureLength();
error InvalidS();
error InvalidV();
error InvalidSignature();
/**
* @dev Returns the address that signed a hashed message (`hash`) with
* `signature`. This address can then be used for verification purposes.
*
* The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
* this function rejects them by requiring the `s` value to be in the lower
* half order, and the `v` value to be either 27 or 28.
*
* IMPORTANT: `hash` _must_ be the result of a hash operation for the
* verification to be secure: it is possible to craft signatures that
* recover to arbitrary addresses for non-hashed data. A safe way to ensure
* this is by receiving a hash of the original message (which may otherwise
* be too long), and then calling {toEthSignedMessageHash} on it.
*/
function recover(bytes32 hash, bytes memory signature) internal pure returns (address signer) {
// Check the signature length
if (signature.length != 65) revert InvalidSignatureLength();
// Divide the signature in r, s and v variables
bytes32 r;
bytes32 s;
uint8 v;
// ecrecover takes the signature parameters, and the only way to get them
// currently is to use assembly.
// solhint-disable-next-line no-inline-assembly
assembly {
r := mload(add(signature, 0x20))
s := mload(add(signature, 0x40))
v := byte(0, mload(add(signature, 0x60)))
}
// EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
// unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
// the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
// signatures from current libraries generate a unique signature with an s-value in the lower half order.
//
// If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
// with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
// vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
// these malleable signatures as well.
if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) revert InvalidS();
if (v != 27 && v != 28) revert InvalidV();
// If the signature is valid (and not malleable), return the signer address
if ((signer = ecrecover(hash, v, r, s)) == address(0)) revert InvalidSignature();
}
/**
* @dev Returns an Ethereum Signed Message, created from a `hash`. This
* replicates the behavior of the
* https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`]
* JSON-RPC method.
*
* See {recover}.
*/
function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
// 32 is the length in bytes of hash,
// enforced by the type signature above
return keccak256(abi.encodePacked('\x19Ethereum Signed Message:\n32', hash));
}
}
// File contracts/Ownable.sol
abstract contract Ownable is IOwnable {
address public owner;
constructor() {
owner = msg.sender;
emit OwnershipTransferred(address(0), msg.sender);
}
modifier onlyOwner() {
if (owner != msg.sender) revert NotOwner();
_;
}
function transferOwnership(address newOwner) external virtual onlyOwner {
if (newOwner == address(0)) revert InvalidOwner();
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
// File contracts/auth/AxelarAuthWeighted.sol
contract AxelarAuthWeighted is Ownable, IAxelarAuthWeighted {
uint256 public currentEpoch;
mapping(uint256 => bytes32) public hashForEpoch;
mapping(bytes32 => uint256) public epochForHash;
uint8 internal constant OLD_KEY_RETENTION = 16;
constructor(bytes[] memory recentOperators) {
for (uint256 i; i < recentOperators.length; ++i) {
_transferOperatorship(recentOperators[i]);
}
}
/**************************\
|* External Functionality *|
\**************************/
/// @dev This function takes messageHash and proof data and reverts if proof is invalid
/// @return True if provided operators are the current ones
function validateProof(bytes32 messageHash, bytes calldata proof) external view returns (bool) {
(address[] memory operators, uint256[] memory weights, uint256 threshold, bytes[] memory signatures) = abi.decode(
proof,
(address[], uint256[], uint256, bytes[])
);
bytes32 operatorsHash = keccak256(abi.encode(operators, weights, threshold));
uint256 operatorsEpoch = epochForHash[operatorsHash];
uint256 epoch = currentEpoch;
if (operatorsEpoch == 0 || epoch - operatorsEpoch >= OLD_KEY_RETENTION) revert InvalidOperators();
_validateSignatures(messageHash, operators, weights, threshold, signatures);
return operatorsEpoch == epoch;
}
/***********************\
|* Owner Functionality *|
\***********************/
function transferOperatorship(bytes calldata params) external onlyOwner {
_transferOperatorship(params);
}
/**************************\
|* Internal Functionality *|
\**************************/
function _transferOperatorship(bytes memory params) internal {
(address[] memory newOperators, uint256[] memory newWeights, uint256 newThreshold) = abi.decode(
params,
(address[], uint256[], uint256)
);
uint256 operatorsLength = newOperators.length;
uint256 weightsLength = newWeights.length;
// operators must be sorted binary or alphabetically in lower case
if (operatorsLength == 0 || !_isSortedAscAndContainsNoDuplicate(newOperators)) revert InvalidOperators();
if (weightsLength != operatorsLength) revert InvalidWeights();
uint256 totalWeight = 0;
for (uint256 i = 0; i < weightsLength; ++i) {
totalWeight += newWeights[i];
}
if (newThreshold == 0 || totalWeight < newThreshold) revert InvalidThreshold();
bytes32 newOperatorsHash = keccak256(params);
if (epochForHash[newOperatorsHash] > 0) revert DuplicateOperators();
uint256 epoch = currentEpoch + 1;
currentEpoch = epoch;
hashForEpoch[epoch] = newOperatorsHash;
epochForHash[newOperatorsHash] = epoch;
emit OperatorshipTransferred(newOperators, newWeights, newThreshold);
}
function _validateSignatures(
bytes32 messageHash,
address[] memory operators,
uint256[] memory weights,
uint256 threshold,
bytes[] memory signatures
) internal pure {
uint256 operatorsLength = operators.length;
uint256 operatorIndex = 0;
uint256 weight = 0;
// looking for signers within operators
// assuming that both operators and signatures are sorted
for (uint256 i = 0; i < signatures.length; ++i) {
address signer = ECDSA.recover(messageHash, signatures[i]);
// looping through remaining operators to find a match
for (; operatorIndex < operatorsLength && signer != operators[operatorIndex]; ++operatorIndex) {}
// checking if we are out of operators
if (operatorIndex == operatorsLength) revert MalformedSigners();
// return if weight sum above threshold
weight += weights[operatorIndex];
// weight needs to reach or surpass threshold
if (weight >= threshold) return;
// increasing operators index if match was found
++operatorIndex;
}
// if weight sum below threshold
revert LowSignaturesWeight();
}
function _isSortedAscAndContainsNoDuplicate(address[] memory accounts) internal pure returns (bool) {
for (uint256 i; i < accounts.length - 1; ++i) {
if (accounts[i] >= accounts[i + 1]) {
return false;
}
}
return accounts[0] != address(0);
}
}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"bytes[]","name":"recentOperators","internalType":"bytes[]"}]},{"type":"error","name":"DuplicateOperators","inputs":[]},{"type":"error","name":"InvalidOperators","inputs":[]},{"type":"error","name":"InvalidOwner","inputs":[]},{"type":"error","name":"InvalidS","inputs":[]},{"type":"error","name":"InvalidSignature","inputs":[]},{"type":"error","name":"InvalidSignatureLength","inputs":[]},{"type":"error","name":"InvalidThreshold","inputs":[]},{"type":"error","name":"InvalidV","inputs":[]},{"type":"error","name":"InvalidWeights","inputs":[]},{"type":"error","name":"LowSignaturesWeight","inputs":[]},{"type":"error","name":"MalformedSigners","inputs":[]},{"type":"error","name":"NotOwner","inputs":[]},{"type":"event","name":"OperatorshipTransferred","inputs":[{"type":"address[]","name":"newOperators","internalType":"address[]","indexed":false},{"type":"uint256[]","name":"newWeights","internalType":"uint256[]","indexed":false},{"type":"uint256","name":"newThreshold","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"currentEpoch","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"epochForHash","inputs":[{"type":"bytes32","name":"","internalType":"bytes32"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"hashForEpoch","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOperatorship","inputs":[{"type":"bytes","name":"params","internalType":"bytes"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"validateProof","inputs":[{"type":"bytes32","name":"messageHash","internalType":"bytes32"},{"type":"bytes","name":"proof","internalType":"bytes"}]}]
Contract Creation Code
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