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35 lines
1.3 KiB
35 lines
1.3 KiB
// 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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* _Available since v4.1._
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*/
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library SignatureChecker {
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function isValidSignatureNow(
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address signer,
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bytes32 hash,
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bytes memory signature
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) internal view returns (bool) {
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(address recovered, ECDSA.RecoverError error) = ECDSA.tryRecover(hash, signature);
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if (error == ECDSA.RecoverError.NoError && recovered == signer) {
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return true;
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}
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(bool success, bytes memory result) = signer.staticcall(
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abi.encodeWithSelector(IERC1271.isValidSignature.selector, hash, signature)
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);
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return (success && result.length == 32 && abi.decode(result, (bytes4)) == IERC1271.isValidSignature.selector);
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}
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}
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