2018-01-04 06:42:21 -08:00
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pragma solidity ^0.4.17;
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2017-06-13 02:18:03 -07:00
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2017-12-13 06:20:56 -08:00
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2017-06-13 02:18:03 -07:00
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library Authorities {
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2017-12-15 02:25:53 -08:00
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function contains (address[] self, address value) internal pure returns (bool) {
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2017-06-13 02:18:03 -07:00
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for (uint i = 0; i < self.length; i++) {
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if (self[i] == value) {
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return true;
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}
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}
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return false;
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}
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}
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2017-12-13 06:20:56 -08:00
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2017-09-04 03:49:05 -07:00
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/// Library used only to test Signer library via rpc calls
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library SignerTest {
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function signer (bytes signature, bytes message) public pure returns (address) {
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2017-09-04 07:02:41 -07:00
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return Signer.signer(signature, message);
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2017-09-04 03:49:05 -07:00
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}
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}
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2017-12-13 06:20:56 -08:00
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2017-09-04 03:49:05 -07:00
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library Utils {
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2018-01-05 05:07:20 -08:00
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function toString (uint256 inputValue) internal pure returns (string str) {
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// it is used only for small numbers
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bytes memory reversed = new bytes(8);
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uint workingValue = inputValue;
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uint i = 0;
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while (workingValue != 0) {
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uint remainder = workingValue % 10;
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workingValue = workingValue / 10;
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reversed[i++] = byte(48 + remainder);
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}
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2017-09-04 03:50:43 -07:00
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bytes memory s = new bytes(i);
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for (uint j = 0; j < i; j++) {
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s[j] = reversed[i - j - 1];
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}
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str = string(s);
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2017-09-04 03:49:05 -07:00
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}
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}
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2017-12-13 06:20:56 -08:00
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2017-09-04 03:49:05 -07:00
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library Signer {
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function signer (bytes signature, bytes message) internal pure returns (address) {
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require(signature.length == 65);
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bytes32 r;
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bytes32 s;
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bytes1 v;
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// solium-disable-next-line security/no-inline-assembly
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assembly {
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r := mload(add(signature, 0x20))
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s := mload(add(signature, 0x40))
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v := mload(add(signature, 0x60))
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}
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return ecrecover(hash(message), uint8(v), r, s);
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}
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2017-12-15 02:25:53 -08:00
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function hash (bytes message) internal pure returns (bytes32) {
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bytes memory prefix = "\x19Ethereum Signed Message:\n";
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return keccak256(prefix, Utils.toString(message.length), message);
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}
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}
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2017-12-13 06:20:56 -08:00
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2017-10-10 02:02:46 -07:00
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contract HomeBridge {
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using Authorities for address[];
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2017-06-13 02:18:03 -07:00
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/// Number of authorities signatures required to withdraw the money.
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///
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/// Must be lesser than number of authorities.
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uint public requiredSignatures;
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2018-01-04 06:14:34 -08:00
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/// The gas cost of calling `HomeBridge.withdraw`.
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///
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/// Is subtracted from `value` on withdraw.
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/// recipient pays the relaying authority for withdraw.
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/// this shuts down attacks that exhaust authorities funds on home chain.
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uint public estimatedGasCostOfWithdraw;
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/// Contract authorities.
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address[] public authorities;
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2017-10-10 02:02:46 -07:00
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/// Used foreign transaction hashes.
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mapping (bytes32 => bool) withdraws;
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2017-06-13 02:18:03 -07:00
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/// Event created on money deposit.
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event Deposit (address recipient, uint value);
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/// Event created on money withdraw.
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event Withdraw (address recipient, uint value);
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2017-06-13 02:18:03 -07:00
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/// Multisig authority validation
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modifier allAuthorities (uint8[] v, bytes32[] r, bytes32[] s, bytes message) {
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var hash = Signer.hash(message);
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var used = new address[](requiredSignatures);
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2017-08-22 04:01:16 -07:00
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require(requiredSignatures <= v.length);
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for (uint i = 0; i < requiredSignatures; i++) {
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var a = ecrecover(hash, v[i], r[i], s[i]);
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require(authorities.contains(a));
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require(!used.contains(a));
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used[i] = a;
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}
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_;
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}
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/// Constructor.
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function HomeBridge (
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uint requiredSignaturesParam,
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address[] authoritiesParam,
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uint estimatedGasCostOfWithdrawParam
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) public
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{
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require(requiredSignaturesParam != 0);
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require(requiredSignaturesParam <= authoritiesParam.length);
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requiredSignatures = requiredSignaturesParam;
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authorities = authoritiesParam;
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estimatedGasCostOfWithdraw = estimatedGasCostOfWithdrawParam;
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}
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/// Should be used to deposit money.
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function () public payable {
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Deposit(msg.sender, msg.value);
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}
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2018-01-05 07:05:13 -08:00
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// layout of message :: bytes:
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// offset 0: 32 bytes :: uint (little endian) - message length
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// offset 32: 20 bytes :: address - recipient address
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// offset 52: 32 bytes :: uint (little endian) - value
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// offset 84: 32 bytes :: bytes32 - transaction hash
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// bytes 1 to 32 are 0 because message length is stored as little endian.
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// mload always reads 32 bytes.
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// so we can and have to start reading recipient at offset 20 instead of 32.
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// if we were to read at 32 the address would contain part of value and be corrupted.
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// when reading from offset 20 mload will read 12 zero bytes followed
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// by the 20 recipient address bytes and correctly convert it into an address.
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// this saves some storage/gas over the alternative solution
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// which is padding address to 32 bytes and reading recipient at offset 32.
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// for more details see discussion in:
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// https://github.com/paritytech/parity-bridge/issues/61
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function getRecipientFromMessage(bytes message) public pure returns (address) {
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address recipient;
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// solium-disable-next-line security/no-inline-assembly
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assembly {
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recipient := mload(add(message, 20))
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}
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return recipient;
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}
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function getValueFromMessage(bytes message) public pure returns (uint) {
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uint value;
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// solium-disable-next-line security/no-inline-assembly
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assembly {
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value := mload(add(message, 52))
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}
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return value;
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}
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function getTransactionHashFromMessage(bytes message) public pure returns (bytes32) {
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bytes32 hash;
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// solium-disable-next-line security/no-inline-assembly
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assembly {
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hash := mload(add(message, 84))
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}
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return hash;
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}
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2018-01-05 07:31:23 -08:00
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/// to be called by authorities to check
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/// whether they withdraw message should be relayed or whether it
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/// is too low to cover the cost of calling withdraw and can be ignored
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function messageValueSufficientToCoverRelay(bytes message) public view returns (bool) {
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return getValueFromMessage(message) > getWithdrawRelayCost();
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}
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2018-01-05 07:30:47 -08:00
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/// an upper bound to the cost of relaying a withdraw by calling HomeBridge.withdraw
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function getWithdrawRelayCost() public view returns (uint) {
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return estimatedGasCostOfWithdraw * tx.gasprice;
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}
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2017-12-14 08:54:49 -08:00
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/// Used to withdraw money from the contract.
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///
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/// message contains:
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/// withdrawal recipient (bytes20)
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/// withdrawal value (uint)
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/// foreign transaction hash (bytes32) // to avoid transaction duplication
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///
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/// NOTE that anyone can call withdraw provided they have the message and required signatures!
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function withdraw (uint8[] v, bytes32[] r, bytes32[] s, bytes message) public allAuthorities(v, r, s, message) {
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require(message.length == 84);
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address recipient = getRecipientFromMessage(message);
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uint value = getValueFromMessage(message);
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bytes32 hash = getTransactionHashFromMessage(message);
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2018-01-04 06:42:36 -08:00
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// The following two statements guard against reentry into this function.
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// Duplicated withdraw or reentry.
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require(!withdraws[hash]);
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// Order of operations below is critical to avoid TheDAO-like re-entry bug
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withdraws[hash] = true;
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uint estimatedWeiCostOfWithdraw = estimatedGasCostOfWithdraw * tx.gasprice;
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// this fails if `value` is not even enough to cover the relay cost.
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// Authorities simply IGNORE withdraws where `value` can’t relay cost.
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// Think of it as `value` getting burned entirely on the relay with no value left to pay out the recipient.
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require(value > estimatedWeiCostOfWithdraw);
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// charge recipient for relay cost
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uint valueRemainingAfterSubtractingCost = value - estimatedWeiCostOfWithdraw;
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// pay out recipient
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recipient.transfer(valueRemainingAfterSubtractingCost);
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// refund relay cost to relaying authority
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msg.sender.transfer(estimatedWeiCostOfWithdraw);
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Withdraw(recipient, valueRemainingAfterSubtractingCost);
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}
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}
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2017-12-13 06:20:56 -08:00
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2017-10-10 02:02:46 -07:00
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contract ForeignBridge {
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using Authorities for address[];
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2017-06-13 02:18:03 -07:00
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struct SignaturesCollection {
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/// Signed message.
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bytes message;
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/// Authorities who signed the message.
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address[] signed;
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/// Signaturs
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bytes[] signatures;
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}
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/// Number of authorities signatures required to withdraw the money.
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///
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/// Must be lesser than number of authorities.
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uint public requiredSignatures;
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/// Contract authorities.
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address[] public authorities;
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2017-06-13 02:18:03 -07:00
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/// Ether balances
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mapping (address => uint) public balances;
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2017-06-13 02:18:03 -07:00
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/// Pending deposits and authorities who confirmed them
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mapping (bytes32 => address[]) deposits;
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/// Pending signatures and authorities who confirmed them
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mapping (bytes32 => SignaturesCollection) signatures;
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/// Event created on money deposit.
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event Deposit(address recipient, uint value);
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/// Event created on money withdraw.
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event Withdraw(address recipient, uint value);
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2017-06-13 02:18:03 -07:00
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/// Event created on money transfer
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event Transfer(address from, address to, uint value);
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2017-10-10 02:02:46 -07:00
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/// Collected signatures which should be relayed to home chain.
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2017-08-22 04:53:40 -07:00
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event CollectedSignatures(address authority, bytes32 messageHash);
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2017-08-25 07:27:55 -07:00
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2017-06-13 02:18:03 -07:00
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/// Constructor.
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2018-01-04 05:12:03 -08:00
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function ForeignBridge(
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uint requiredSignaturesParam,
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address[] authoritiesParam
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2018-01-04 06:29:54 -08:00
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) public
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{
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2018-01-04 05:12:03 -08:00
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require(requiredSignaturesParam != 0);
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require(requiredSignaturesParam <= authoritiesParam.length);
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requiredSignatures = requiredSignaturesParam;
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authorities = authoritiesParam;
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2017-06-13 02:18:03 -07:00
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}
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/// Multisig authority validation
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modifier onlyAuthority () {
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2017-08-22 04:01:16 -07:00
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require(authorities.contains(msg.sender));
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2017-06-13 02:18:03 -07:00
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_;
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}
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2017-08-25 07:27:55 -07:00
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2017-06-13 02:18:03 -07:00
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/// Used to deposit money to the contract.
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///
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/// deposit recipient (bytes20)
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/// deposit value (uint)
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/// mainnet transaction hash (bytes32) // to avoid transaction duplication
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2017-12-13 06:28:44 -08:00
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function deposit (address recipient, uint value, bytes32 transactionHash) public onlyAuthority() {
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2017-09-04 03:50:43 -07:00
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// Protection from misbehaing authority
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2017-12-13 06:30:13 -08:00
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var hash = keccak256(recipient, value, transactionHash);
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2017-09-01 07:26:06 -07:00
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2017-06-13 02:18:03 -07:00
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// Duplicated deposits
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2017-08-22 04:01:16 -07:00
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require(!deposits[hash].contains(msg.sender));
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2017-06-13 02:18:03 -07:00
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deposits[hash].push(msg.sender);
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// TODO: this may cause troubles if requriedSignatures len is changed
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if (deposits[hash].length == requiredSignatures) {
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balances[recipient] += value;
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Deposit(recipient, value);
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}
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}
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2017-08-25 07:27:55 -07:00
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2017-06-13 02:18:03 -07:00
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/// Used to transfer money between accounts
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2017-12-13 06:31:23 -08:00
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function transfer (address recipient, uint value, bool externalTransfer) public {
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2017-08-22 04:01:16 -07:00
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require(balances[msg.sender] >= value);
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2017-10-23 22:23:17 -07:00
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// fails if value == 0, or if there is an overflow
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require(balances[recipient] + value > balances[recipient]);
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2017-08-25 07:27:55 -07:00
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2017-06-13 02:18:03 -07:00
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balances[msg.sender] -= value;
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if (externalTransfer) {
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Withdraw(recipient, value);
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} else {
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balances[recipient] += value;
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Transfer(msg.sender, recipient, value);
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}
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}
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2017-08-25 07:27:55 -07:00
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2017-06-13 02:18:03 -07:00
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/// Should be used as sync tool
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2017-08-25 07:27:55 -07:00
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///
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2017-06-13 02:18:03 -07:00
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/// Message is a message that should be relayed to main chain once authorities sign it.
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2017-08-25 07:27:55 -07:00
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///
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2017-08-23 10:09:51 -07:00
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/// for withdraw message contains:
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/// withdrawal recipient (bytes20)
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/// withdrawal value (uint)
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2017-10-10 02:02:46 -07:00
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/// foreign transaction hash (bytes32) // to avoid transaction duplication
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2017-12-13 06:31:23 -08:00
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function submitSignature (bytes signature, bytes message) public onlyAuthority() {
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2017-09-04 03:49:05 -07:00
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// Validate submited signatures
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2017-09-04 07:02:41 -07:00
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require(Signer.signer(signature, message) == msg.sender);
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2017-09-04 03:49:05 -07:00
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2017-09-04 03:50:43 -07:00
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// Valid withdraw message must have 84 bytes
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require(message.length == 84);
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2017-12-13 06:30:13 -08:00
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var hash = keccak256(message);
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2017-08-25 07:27:55 -07:00
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2017-06-13 02:18:03 -07:00
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// Duplicated signatures
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2017-08-22 04:01:16 -07:00
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require(!signatures[hash].signed.contains(msg.sender));
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2017-06-13 02:18:03 -07:00
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signatures[hash].message = message;
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signatures[hash].signed.push(msg.sender);
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2017-08-22 04:47:01 -07:00
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signatures[hash].signatures.push(signature);
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2017-08-25 07:27:55 -07:00
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2017-12-14 08:54:49 -08:00
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// TODO: this may cause troubles if requiredSignatures len is changed
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2017-06-13 02:18:03 -07:00
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if (signatures[hash].signed.length == requiredSignatures) {
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2017-08-22 04:53:40 -07:00
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CollectedSignatures(msg.sender, hash);
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2017-06-13 02:18:03 -07:00
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}
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}
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2017-08-25 07:27:55 -07:00
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/// Get signature
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2017-12-13 06:28:44 -08:00
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function signature (bytes32 hash, uint index) public constant returns (bytes) {
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2017-08-22 04:47:01 -07:00
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return signatures[hash].signatures[index];
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}
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2017-08-25 07:27:55 -07:00
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2017-08-22 04:53:40 -07:00
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/// Get message
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2017-12-13 06:28:44 -08:00
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function message (bytes32 hash) public constant returns (bytes) {
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2017-08-22 04:53:40 -07:00
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return signatures[hash].message;
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}
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2017-08-21 08:32:37 -07:00
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}
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