Contract Source Code (Solidity Standard Json-Input format)

IDE

• Blockscan IDE

More Options

• Similar
• Submit Audit
• Compare

/**
 * Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

pragma solidity 0.6.12;

import { ECRecover } from "./ECRecover.sol";
import { IERC1271 } from "../interface/IERC1271.sol";

/**
 * @dev Signature verification helper that can be used instead of `ECRecover.recover` to seamlessly support both ECDSA
 * signatures from externally owned accounts (EOAs) as well as ERC1271 signatures from smart contract wallets.
 *
 * Adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/21bb89ef5bfc789b9333eb05e3ba2b7b284ac77c/contracts/utils/cryptography/SignatureChecker.sol
 */
library SignatureChecker {
    /**
     * @dev 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 `ECRecover.recover`.
     * @param signer        Address of the claimed signer
     * @param digest        Keccak-256 hash digest of the signed message
     * @param signature     Signature byte array associated with hash
     */
    function isValidSignatureNow(
        address signer,
        bytes32 digest,
        bytes memory signature
    ) external view returns (bool) {
        if (!isContract(signer)) {
            return ECRecover.recover(digest, signature) == signer;
        }
        return isValidERC1271SignatureNow(signer, digest, signature);
    }

    /**
     * @dev Checks if a signature is valid for a given signer and data hash. The signature is validated
     * against the signer smart contract using ERC1271.
     * @param signer        Address of the claimed signer
     * @param digest        Keccak-256 hash digest of the signed message
     * @param signature     Signature byte array associated with hash
     *
     * 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).
     */
    function isValidERC1271SignatureNow(
        address signer,
        bytes32 digest,
        bytes memory signature
    ) internal view returns (bool) {
        (bool success, bytes memory result) = signer.staticcall(
            abi.encodeWithSelector(
                IERC1271.isValidSignature.selector,
                digest,
                signature
            )
        );
        return (success &&
            result.length >= 32 &&
            abi.decode(result, (bytes32)) ==
            bytes32(IERC1271.isValidSignature.selector));
    }

    /**
     * @dev Checks if the input address is a smart contract.
     */
    function isContract(address addr) internal view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(addr)
        }
        return size > 0;
    }
}

/**
 * Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

pragma solidity 0.6.12;

/**
 * @title ECRecover
 * @notice A library that provides a safe ECDSA recovery function
 */
library ECRecover {
    /**
     * @notice Recover signer's address from a signed message
     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol
     * Modifications: Accept v, r, and s as separate arguments
     * @param digest    Keccak-256 hash digest of the signed message
     * @param v         v of the signature
     * @param r         r of the signature
     * @param s         s of the signature
     * @return Signer address
     */
    function recover(
        bytes32 digest,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (
            uint256(s) >
            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0
        ) {
            revert("ECRecover: invalid signature 's' value");
        }

        if (v != 27 && v != 28) {
            revert("ECRecover: invalid signature 'v' value");
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(digest, v, r, s);
        require(signer != address(0), "ECRecover: invalid signature");

        return signer;
    }

    /**
     * @notice Recover signer's address from a signed message
     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/0053ee040a7ff1dbc39691c9e67a69f564930a88/contracts/utils/cryptography/ECDSA.sol
     * @param digest    Keccak-256 hash digest of the signed message
     * @param signature Signature byte array associated with hash
     * @return Signer address
     */
    function recover(bytes32 digest, bytes memory signature)
        internal
        pure
        returns (address)
    {
        require(signature.length == 65, "ECRecover: invalid signature length");

        bytes32 r;
        bytes32 s;
        uint8 v;

        // ecrecover takes the signature parameters, and the only way to get them
        // currently is to use assembly.
        /// @solidity memory-safe-assembly
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }
        return recover(digest, v, r, s);
    }
}

/**
 * Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

pragma solidity 0.6.12;

/**
 * @dev Interface of the ERC1271 standard signature validation method for
 * contracts as defined in https://eips.ethereum.org/EIPS/eip-1271[ERC-1271].
 */
interface IERC1271 {
    /**
     * @dev Should return whether the signature provided is valid for the provided data
     * @param hash          Hash of the data to be signed
     * @param signature     Signature byte array associated with the provided data hash
     * @return magicValue   bytes4 magic value 0x1626ba7e when function passes
     */
    function isValidSignature(bytes32 hash, bytes memory signature)
        external
        view
        returns (bytes4 magicValue);
}

{
  "viaIR": false,
  "remappings": [
    "forge-std/=lib/forge-std/src/",
    "@openzeppelin/=node_modules/@openzeppelin/",
    "@ensdomains/=node_modules/@ensdomains/",
    "@solidity-parser/=node_modules/prettier-plugin-solidity/node_modules/@solidity-parser/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "eth-gas-reporter/=node_modules/eth-gas-reporter/",
    "hardhat/=node_modules/hardhat/"
  ],
  "evmVersion": "istanbul",
  "outputSelection": {
    "*": {
      "*": [
        "abi"
      ]
    }
  },
  "optimizer": {
    "enabled": true,
    "mode": "3",
    "fallback_to_optimizing_for_size": false,
    "disable_system_request_memoization": true
  },
  "metadata": {},
  "libraries": {
    "contracts/util/SignatureChecker.sol": {
      "SignatureChecker": "0xdBd3FF2BC63D6e969aCb5333918Ac29c4bD40179"
    }
  },
  "detectMissingLibraries": false,
  "enableEraVMExtensions": false,
  "forceEVMLA": false
}

[{"inputs":[{"internalType":"address","name":"signer","type":"address"},{"internalType":"bytes32","name":"digest","type":"bytes32"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"isValidSignatureNow","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

9c4d535b000000000000000000000000000000000000000000000000000000000000000001000087f0044ef82d51cf04ed9f45efea20d98f3802dcfecd0ca47560d9796b00000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000000

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