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30 lines
1.2 KiB
30 lines
1.2 KiB
4 years ago
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// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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import "./ECDSA.sol";
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import "../Address.sol";
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import "../../interfaces/IERC1271.sol";
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/**
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* @dev Signature verification helper: Provide a single mechanism to verify both private-key (EOA) ECDSA signature and
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* ERC1271 contract sigantures. Using this instead of ECDSA.recover in your contract will make them compatible with
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* smart contract wallets such as Argent and Gnosis.
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*
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* Note: unlike ECDSA signatures, contract signature's are revocable, and the outcome of this function can thus change
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* through time. It could return true at block N and false at block N+1 (or the opposite).
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*/
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library SignatureChecker {
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function isValidSignatureNow(address signer, bytes32 hash, bytes memory signature) internal view returns (bool) {
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if (Address.isContract(signer)) {
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try IERC1271(signer).isValidSignature(hash, signature) returns (bytes4 magicValue) {
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return magicValue == IERC1271(signer).isValidSignature.selector;
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} catch {
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return false;
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}
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} else {
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return ECDSA.recover(hash, signature) == signer;
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}
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}
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}
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