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38 lines
1.6 KiB
Solidity
38 lines
1.6 KiB
Solidity
2 years ago
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// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/SignatureChecker.sol)
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pragma solidity ^0.8.0;
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import "./ECDSA.sol";
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import "../../interfaces/IERC1271.sol";
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/**
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* @dev Signature verification helper that can be used instead of `ECDSA.recover` to seamlessly support both ECDSA
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* signatures from externally owned accounts (EOAs) as well as ERC1271 signatures from smart contract wallets like
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* Argent and Gnosis Safe.
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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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/**
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* @dev Checks if a signature is valid for a given signer and data hash. If the signer is a smart contract, the
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* signature is validated against that smart contract using ERC1271, otherwise it's validated using `ECDSA.recover`.
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*
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* NOTE: Unlike ECDSA signatures, contract signatures are revocable, and the outcome of this function can thus
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* change 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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function isValidSignatureNow(address signer, bytes32 hash, bytes memory signature) 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 &&
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result.length == 32 &&
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abi.decode(result, (bytes32)) == bytes32(IERC1271.isValidSignature.selector));
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}
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}
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