forked from DecentralizedClimateFoundation/DCIPs
32 lines
1.3 KiB
Solidity
32 lines
1.3 KiB
Solidity
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// SPDX-License-Identifier: MIT
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pragma solidity 0.8.17;
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import {TransferParameters} from "src/MyToken/MyTokenStructs.sol";
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contract SigUtils {
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bytes32 internal DOMAIN_SEPARATOR;
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constructor(bytes32 _DOMAIN_SEPARATOR) {
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DOMAIN_SEPARATOR = _DOMAIN_SEPARATOR;
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}
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// keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
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//bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
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bytes32 public constant TRANSFER_TYPEHASH =
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keccak256("Transfer(address from,address to,uint256 amount,uint256 nonce,uint256 deadline)");
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// computes the hash of a permit
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function getStructHash(TransferParameters memory _transfer) internal pure returns (bytes32) {
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return keccak256(
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abi.encode(
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TRANSFER_TYPEHASH, _transfer.from, _transfer.to, _transfer.amount, _transfer.nonce, _transfer.deadline
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)
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);
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}
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// computes the hash of the fully encoded EIP-712 message for the domain, which can be used to recover the signer
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function getTypedDataHash(TransferParameters memory _transfer) public view returns (bytes32) {
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return keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR, getStructHash(_transfer)));
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}
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}
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