31 lines
1.1 KiB
Solidity
31 lines
1.1 KiB
Solidity
|
// SPDX-License-Identifier: MIT OR Apache-2.0
|
||
|
|
|
||
|
|
pragma solidity ^0.8.14;
|
||
|
|
|
||
|
|
import "@openzeppelin/contracts-upgradeable/utils/cryptography/ECDSAUpgradeable.sol";
|
||
|
|
import "@openzeppelin/contracts-upgradeable/utils/StringsUpgradeable.sol";
|
||
|
|
|
||
|
|
contract SignatureControl {
|
||
|
|
function _toEthSignedMessage(bytes memory message) internal pure returns (bytes32) {
|
||
|
|
return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", StringsUpgradeable.toString(message.length), message));
|
||
|
|
}
|
||
|
|
|
||
|
|
function _toAsciiString(address x) internal pure returns (string memory) {
|
||
|
|
bytes memory s = new bytes(42);
|
||
|
|
s[0] = "0";
|
||
|
|
s[1] = "x";
|
||
|
|
for (uint256 i = 0; i < 20; i++) {
|
||
|
|
bytes1 b = bytes1(uint8(uint256(uint160(x)) / (2**(8 * (19 - i)))));
|
||
|
|
bytes1 hi = bytes1(uint8(b) / 16);
|
||
|
|
bytes1 lo = bytes1(uint8(b) - 16 * uint8(hi));
|
||
|
|
s[2 * i + 2] = _char(hi);
|
||
|
|
s[2 * i + 3] = _char(lo);
|
||
|
|
}
|
||
|
|
return string(s);
|
||
|
|
}
|
||
|
|
|
||
|
|
function _char(bytes1 b) private pure returns (bytes1 c) {
|
||
|
|
if (uint8(b) < 10) return bytes1(uint8(b) + 0x30);
|
||
|
|
else return bytes1(uint8(b) + 0x57);
|
||
|
|
}
|
||
|
|
}
|