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2022-01-29 06:15:20 +00:00
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docs/modules/api/pages/utils.adoc
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@ -2581,12 +2581,9 @@ See {recover}.
import "@openzeppelin/contracts/utils/cryptography/SignatureChecker.sol";
```
Signature verification helper: Provide a single mechanism to verify both private-key (EOA) ECDSA signature and
ERC1271 contract signatures. Using this instead of ECDSA.recover in your contract will make them compatible with
smart contract wallets such as Argent and Gnosis.
Note: unlike ECDSA signatures, contract signature's are revocable, and the outcome of this function can thus change
through time. It could return true at block N and false at block N+1 (or the opposite).
Signature verification helper that can be used instead of `ECDSA.recover` to seamlessly support both ECDSA
signatures from externally owned accounts (EOAs) as well as ERC1271 signatures from smart contract wallets like
Argent and Gnosis Safe.
_Available since v4.1._
@ -2604,7 +2601,11 @@ _Available since v4.1._
[[SignatureChecker-isValidSignatureNow-address-bytes32-bytes-]]
==== `[.contract-item-name]#++isValidSignatureNow++#++(address signer, bytes32 hash, bytes signature) → bool++` [.item-kind]#internal#
Checks if a signature is valid for a given signer and data hash. If the signer is a smart contract, the
signature is validated against that smart contract using ERC1271, otherwise it's validated using `ECDSA.recover`.
NOTE: Unlike ECDSA signatures, contract signatures are revocable, and the outcome of this function can thus
change through time. It could return true at block N and false at block N+1 (or the opposite).