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