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PrivateContract.sol
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PrivateContract.sol
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// Private Transactions State Storage
//
// Copyright 2018 Parity Technologies Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This contract keeps track of a private transaction state (supposedly encrypted)
// and allows its change only if all the Validators (from a static list, initialized in constructor)
// have signed a new state (hashed together with a current nonce, for replay protection).
pragma solidity ^0.4.18;
contract PrivateContract {
address[] public validators;
bytes public state;
bytes public code;
uint256 public nonce;
event PrivateStateChanged(
address changesOriginator,
bytes originalTransactionHash
);
constructor(
address[] initialValidators,
bytes initialCode,
bytes initialState
)
public
{
validators = initialValidators;
code = initialCode;
state = initialState;
nonce = 1;
}
function getValidators()
public
view
returns (address[])
{
return validators;
}
function setState(
bytes newState,
uint8[] v,
bytes32[] r,
bytes32[] s
)
public
{
bytes32 noncedStateHash = keccak256(
abi.encodePacked([keccak256(newState), bytes32(nonce)])
);
for (uint i = 0; i < validators.length; i++) {
assert(
ecrecover(
noncedStateHash,
v[i],
r[i],
s[i]
) == validators[i]
);
}
state = newState;
nonce = nonce + 1;
}
function notifyChanges(
address changesOriginator,
bytes originalTransactionHash
)
public
{
emit PrivateStateChanged(changesOriginator, originalTransactionHash);
}
function getVersion()
public
pure
returns (uint8)
{
return 2;
}
}