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32 lines
1003 B
32 lines
1003 B
4 years ago
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// SPDX-License-Identifier: MIT
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pragma solidity >=0.6.0 <0.8.0;
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import "../drafts/EIP712.sol";
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import "../cryptography/ECDSA.sol";
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contract EIP712External is EIP712 {
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constructor(string memory name, string memory version) public EIP712(name, version) {}
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function domainSeparator() external view returns (bytes32) {
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return _domainSeparatorV4();
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}
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function verify(bytes memory signature, address signer, address mailTo, string memory mailContents) external view {
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bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
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keccak256("Mail(address to,string contents)"),
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mailTo,
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keccak256(bytes(mailContents))
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)));
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address recoveredSigner = ECDSA.recover(digest, signature);
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require(recoveredSigner == signer);
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}
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function getChainId() external pure returns (uint256 chainId) {
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// solhint-disable-next-line no-inline-assembly
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assembly {
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chainId := chainid()
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}
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}
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}
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