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Similar Match Source Code This contract matches the deployed Bytecode of the Source Code for Contract 0xF7B81229...febAD186B The constructor portion of the code might be different and could alter the actual behaviour of the contract
Contract Name:
TetherTokenV2
Compiler Version
v0.8.4+commit.c7e474f2
ZkSolc Version
v1.5.7
Optimization Enabled:
Yes with Mode z
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: Apache 2.0 import "./TetherToken.sol"; import "./EIP3009.sol"; import "./util/SignatureChecker.sol"; pragma solidity 0.8.4; contract TetherTokenV2 is TetherToken, EIP3009 { bytes32 internal constant _PERMIT_TYPEHASH = keccak256( "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)" ); constructor () initializer {} function domainSeparator() internal view virtual override returns (bytes32) { return _domainSeparatorV4(); } /** * The following applies to the following function and comments to that function: * * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * 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. * * --------------------------------------------------------------------- * * Adapted by Tether.to 2024 for greater flexibility and reusability */ function _permit( address owner_, address spender, uint256 value, uint256 deadline, bytes memory signature ) internal { require(block.timestamp <= deadline, "ERC20Permit: expired deadline"); bytes32 structHash = keccak256( abi.encode( _PERMIT_TYPEHASH, owner_, spender, value, _useNonce(owner_), deadline ) ); bytes32 hash = _hashTypedDataV4(structHash); require( SignatureChecker.isValidSignatureNow(owner_, hash, signature), "EIP2612: invalid signature" ); _approve(owner_, spender, value); } /** * @notice Update allowance with a signed permit * @param owner_ Token owner's address * @param spender Spender's address * @param value Amount of allowance * @param deadline The time at which the signature expires (unix time) * @param v signature component v * @param r signature component r * @param s signature component s */ function permit( address owner_, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public virtual override { _permit(owner_, spender, value, deadline, abi.encodePacked(r, s, v)); } /** * The following applies to the following function and comments to that function: * * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * 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. * * --------------------------------------------------------------------- * * Adapted by Tether.to 2024 for greater flexibility and reusability */ /** * @notice Update allowance with a signed permit * @dev EOA wallet signatures should be packed in the order of r, s, v. * @param owner_ Token owner's address (Authorizer) * @param spender Spender's address * @param value Amount of allowance * @param deadline The time at which the signature expires (unix time), or max uint256 value to signal no expiration * @param signature Signature bytes signed by an EOA wallet or a contract wallet */ function permit( address owner_, address spender, uint256 value, uint256 deadline, bytes memory signature ) external { _permit(owner_, spender, value, deadline, signature); } /** * The following applies to the following function and comments to that function: * * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * 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. * * --------------------------------------------------------------------- * * Adapted by Tether.to 2024 for greater flexibility and reusability */ /** * @notice Execute a transfer with a signed authorization * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param v v of the signature * @param r r of the signature * @param s s of the signature */ function transferWithAuthorization( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, uint8 v, bytes32 r, bytes32 s ) public onlyNotBlocked { _transferWithAuthorizationValidityCheck( from, to, value, validAfter, validBefore, nonce, abi.encodePacked(r, s, v) ); _transfer(from, to, value); } /** * The following applies to the following function and comments to that function: * * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * 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. * * --------------------------------------------------------------------- * * Adapted by Tether.to 2024 for greater flexibility and reusability */ /** * @notice Execute a transfer with a signed authorization * @dev EOA wallet signatures should be packed in the order of r, s, v. * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param signature Signature bytes signed by an EOA wallet or a contract wallet */ function transferWithAuthorization( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, bytes memory signature ) external onlyNotBlocked { _transferWithAuthorizationValidityCheck( from, to, value, validAfter, validBefore, nonce, signature ); _transfer(from, to, value); } /** * The following applies to the following function and comments to that function: * * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * 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. * * --------------------------------------------------------------------- * * Adapted by Tether.to 2024 for greater flexibility and reusability */ /** * @notice Receive a transfer with a signed authorization from the payer * @dev This has an additional check to ensure that the payee's address * matches the caller of this function to prevent front-running attacks. * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param v v of the signature * @param r r of the signature * @param s s of the signature */ function receiveWithAuthorization( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, uint8 v, bytes32 r, bytes32 s ) public onlyNotBlocked { _receiveWithAuthorizationValidityCheck( from, to, value, validAfter, validBefore, nonce, abi.encodePacked(r, s, v) ); _transfer(from, to, value); } /** * The following applies to the following function and comments to that function: * * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * 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. * * --------------------------------------------------------------------- * * Adapted by Tether.to 2024 for greater flexibility and reusability */ /** * @notice Receive a transfer with a signed authorization from the payer * @dev This has an additional check to ensure that the payee's address * matches the caller of this function to prevent front-running attacks. * EOA wallet signatures should be packed in the order of r, s, v. * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param signature Signature bytes signed by an EOA wallet or a contract wallet */ function receiveWithAuthorization( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, bytes memory signature ) external onlyNotBlocked { _receiveWithAuthorizationValidityCheck( from, to, value, validAfter, validBefore, nonce, signature ); _transfer(from, to, value); } uint256[48] private __gap; }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * 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. * * --------------------------------------------------------------------- * * Adapted by Tether.to 2024 for greater flexibility and reusability */ pragma solidity >=0.6.12 <0.9.0; import { SignatureChecker } from "./util/SignatureChecker.sol"; import { MessageHashUtils } from "./util/MessageHashUtils.sol"; /** * @title EIP-3009 * @notice Provide internal implementation for gas-abstracted transfers * @dev Contracts that inherit from this must wrap these with publicly * accessible functions, optionally adding modifiers where necessary */ abstract contract EIP3009 { bytes32 public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = keccak256("TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)"); bytes32 public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = keccak256("ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)"); bytes32 public constant CANCEL_AUTHORIZATION_TYPEHASH = keccak256("CancelAuthorization(address authorizer,bytes32 nonce)"); /** * @dev authorizer address => nonce => bool (true if nonce is used) */ mapping(address => mapping(bytes32 => bool)) private _authorizationStates; event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce); event AuthorizationCanceled( address indexed authorizer, bytes32 indexed nonce ); function domainSeparator() internal virtual view returns (bytes32); /** * @notice Returns the state of an authorization * @dev Nonces are randomly generated 32-byte data unique to the * authorizer's address * @param authorizer Authorizer's address * @param nonce Nonce of the authorization * @return True if the nonce is used */ function authorizationState(address authorizer, bytes32 nonce) external view returns (bool) { return _authorizationStates[authorizer][nonce]; } /** * @notice Execute a transfer with a signed authorization * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param signature signature in bytes */ function _transferWithAuthorizationValidityCheck( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, bytes memory signature ) internal { _requireValidAuthorization(from, nonce, validAfter, validBefore); _requireValidSignature( from, keccak256( abi.encode( TRANSFER_WITH_AUTHORIZATION_TYPEHASH, from, to, value, validAfter, validBefore, nonce ) ), signature ); _markAuthorizationAsUsed(from, nonce); } /** * @notice Receive a transfer with a signed authorization from the payer * @dev This has an additional check to ensure that the payee's address * matches the caller of this function to prevent front-running attacks. * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param signature signature in bytes */ function _receiveWithAuthorizationValidityCheck( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, bytes memory signature ) internal { require(to == msg.sender, "TetherToken: to != msg.sender"); _requireValidAuthorization(from, nonce, validAfter, validBefore); _requireValidSignature( from, keccak256( abi.encode( RECEIVE_WITH_AUTHORIZATION_TYPEHASH, from, to, value, validAfter, validBefore, nonce ) ), signature ); _markAuthorizationAsUsed(from, nonce); } function _cancelAuthorization( address authorizer, bytes32 nonce, bytes memory signature ) internal { _requireUnusedAuthorization(authorizer, nonce); _requireValidSignature( authorizer, keccak256( abi.encode(CANCEL_AUTHORIZATION_TYPEHASH, authorizer, nonce) ), signature ); _authorizationStates[authorizer][nonce] = true; emit AuthorizationCanceled(authorizer, nonce); } /** * @notice Attempt to cancel an authorization * @param authorizer Authorizer's address * @param nonce Nonce of the authorization * @param v v of the signature * @param r r of the signature * @param s s of the signature */ function cancelAuthorization( address authorizer, bytes32 nonce, uint8 v, bytes32 r, bytes32 s ) public { _cancelAuthorization(authorizer, nonce, abi.encodePacked(r,s,v)); } /** * @notice Attempt to cancel an authorization * @dev Works only if the authorization is not yet used. * EOA wallet signatures should be packed in the order of r, s, v. * @param authorizer Authorizer's address * @param nonce Nonce of the authorization * @param signature Signature bytes signed by an EOA wallet or a contract wallet */ function cancelAuthorization( address authorizer, bytes32 nonce, bytes memory signature ) external { _cancelAuthorization(authorizer, nonce, signature); } /** * @notice Validates that signature against input data struct * @param signer Signer's address * @param dataHash Hash of encoded data struct * @param signature signature in bytes */ function _requireValidSignature( address signer, bytes32 dataHash, bytes memory signature ) private view { require( SignatureChecker.isValidSignatureNow( signer, MessageHashUtils.toTypedDataHash(domainSeparator(), dataHash), signature ), "TetherToken: invalid signature" ); } /** * @notice Check that an authorization is unused * @param authorizer Authorizer's address * @param nonce Nonce of the authorization */ function _requireUnusedAuthorization(address authorizer, bytes32 nonce) private view { require( !_authorizationStates[authorizer][nonce], "TetherToken: auth invalid" ); } /** * @notice Check that authorization is valid * @param authorizer Authorizer's address * @param nonce Nonce of the authorization * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) */ function _requireValidAuthorization( address authorizer, bytes32 nonce, uint256 validAfter, uint256 validBefore ) private view { require( block.timestamp > validAfter, "TetherToken: auth early" ); require(block.timestamp < validBefore, "TetherToken: auth expired"); _requireUnusedAuthorization(authorizer, nonce); } /** * @notice Mark an authorization as used * @param authorizer Authorizer's address * @param nonce Nonce of the authorization */ function _markAuthorizationAsUsed(address authorizer, bytes32 nonce) private { _authorizationStates[authorizer][nonce] = true; emit AuthorizationUsed(authorizer, nonce); } uint256[49] private __gap; }
// SPDX-License-Identifier: Apache 2.0 pragma solidity 0.8.4; import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol"; import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol"; import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/draft-ERC20PermitUpgradeable.sol"; import "./WithBlockedList.sol"; /* Copyright Tether.to 2024 Version 2.0(a) Licensed under the Apache License, Version 2.0 http://www.apache.org/licenses/LICENSE-2.0 */ contract TetherToken is Initializable, ERC20PermitUpgradeable, OwnableUpgradeable, WithBlockedList { // Unused variable retained to preserve storage slots across upgrades mapping(address => bool) public isTrusted; uint8 private tetherDecimals; function initialize( string memory _name, string memory _symbol, uint8 _decimals ) public initializer { tetherDecimals = _decimals; __Ownable_init(); __ERC20_init(_name, _symbol); __ERC20Permit_init(_name); } function decimals() public view virtual override returns (uint8) { return tetherDecimals; } function _beforeTokenTransfer( address from, address to, uint256 ) internal virtual override { require(!isBlocked[from] || msg.sender == owner(), "TetherToken: from is blocked"); require( to != address(this), "TetherToken: transfer to the contract address" ); } function transferFrom( address _sender, address _recipient, uint256 _amount ) public virtual override onlyNotBlocked returns (bool) { return super.transferFrom(_sender, _recipient, _amount); } function multiTransfer ( address[] calldata _recipients, uint256[] calldata _values ) external { require( _recipients.length == _values.length, "TetherToken: multiTransfer mismatch" ); for (uint256 i = 0; i < _recipients.length; i++) { transfer(_recipients[i], _values[i]); } } function mint(address _destination, uint256 _amount) public onlyOwner { _mint(_destination, _amount); emit Mint(_destination, _amount); } function burnFrom(address _from, uint256 _amount) public onlyOwner { _burn(_from, _amount); emit Burn(_from, _amount); } function redeem(uint256 _amount) public onlyOwner { _burn(owner(), _amount); emit Redeem(_amount); } function destroyBlockedFunds(address _blockedUser) public onlyOwner { require(isBlocked[_blockedUser], "TetherToken: user is not blocked"); uint256 blockedFunds = balanceOf(_blockedUser); _burn(_blockedUser, blockedFunds); emit DestroyedBlockedFunds(_blockedUser, blockedFunds); } event Mint(address indexed _destination, uint256 _amount); event Burn(address indexed _from, uint256 _amount); event Redeem(uint256 _amount); event DestroyedBlockedFunds(address indexed _blockedUser, uint256 _balance); }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * 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. * * --------------------------------------------------------------------- * * Adapted by Tether.to 2024 for greater flexibility and reusability */ pragma solidity >=0.6.12 <0.9.0; import { ECRecover } from "./ECRecover.sol"; import { IERC1271 } from "../interfaces/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 ) internal 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; } }
// SPDX-License-Identifier: Apache 2.0 pragma solidity 0.8.4; import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol"; /* Copyright Tether.to 2020 Author Will Harborne Licensed under the Apache License, Version 2.0 http://www.apache.org/licenses/LICENSE-2.0 */ contract WithBlockedList is OwnableUpgradeable { /** * @dev Reverts if called by a blocked account */ modifier onlyNotBlocked() { require(!isBlocked[_msgSender()], "Blocked: msg.sender is blocked"); _; } mapping (address => bool) public isBlocked; function addToBlockedList (address _user) public onlyOwner { isBlocked[_user] = true; emit BlockPlaced(_user); } function removeFromBlockedList (address _user) public onlyOwner { isBlocked[_user] = false; emit BlockReleased(_user); } event BlockPlaced(address indexed _user); event BlockReleased(address indexed _user); }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * 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. * * --------------------------------------------------------------------- * * Adapted by Tether.to 2024 for greater flexibility and reusability */ pragma solidity >=0.6.12 <0.9.0; /** * @dev Signature message hash utilities for producing digests to be consumed by {ECDSA} recovery or signing. * * The library provides methods for generating a hash of a message that conforms to the * https://eips.ethereum.org/EIPS/eip-191[EIP 191] and https://eips.ethereum.org/EIPS/eip-712[EIP 712] * specifications. */ library MessageHashUtils { /** * @dev Returns the keccak256 digest of an EIP-712 typed data (EIP-191 version `0x01`). * Adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/21bb89ef5bfc789b9333eb05e3ba2b7b284ac77c/contracts/utils/cryptography/MessageHashUtils.sol * * The digest is calculated from a `domainSeparator` and a `structHash`, by prefixing them with * `\x19\x01` and hashing the result. It corresponds to the hash signed by the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] JSON-RPC method as part of EIP-712. * * @param domainSeparator Domain separator * @param structHash Hashed EIP-712 data struct * @return digest The keccak256 digest of an EIP-712 typed data */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 digest) { /// @solidity memory-safe-assembly assembly { let ptr := mload(0x40) mstore(ptr, "\x19\x01") mstore(add(ptr, 0x02), domainSeparator) mstore(add(ptr, 0x22), structHash) digest := keccak256(ptr, 0x42) } } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * 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. * * --------------------------------------------------------------------- * * Adapted by Tether.to 2024 for greater flexibility and reusability */ pragma solidity >=0.6.12 <0.9.0; /** * @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); }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * 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. * * --------------------------------------------------------------------- * * Adapted by Tether.to 2024 for greater flexibility and reusability */ pragma solidity >=0.6.12 <0.9.0; /** * @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); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/ContextUpgradeable.sol"; import "../proxy/utils/Initializable.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ function __Ownable_init() internal initializer { __Context_init_unchained(); __Ownable_init_unchained(); } function __Ownable_init_unchained() internal initializer { _setOwner(_msgSender()); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _setOwner(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _setOwner(newOwner); } function _setOwner(address newOwner) private { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } uint256[49] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC20Upgradeable.sol"; import "./extensions/IERC20MetadataUpgradeable.sol"; import "../../utils/ContextUpgradeable.sol"; import "../../proxy/utils/Initializable.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of returning `false` on failure. This behavior is nonetheless conventional * and does not conflict with the expectations of ERC20 applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ function __ERC20_init(string memory name_, string memory symbol_) internal initializer { __Context_init_unchained(); __ERC20_init_unchained(name_, symbol_); } function __ERC20_init_unchained(string memory name_, string memory symbol_) internal initializer { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overridden; * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { _transfer(sender, recipient, amount); uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); unchecked { _approve(sender, _msgSender(), currentAllowance - amount); } return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(_msgSender(), spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `sender` to `recipient`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer( address sender, address recipient, uint256 amount ) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[sender] = senderBalance - amount; } _balances[recipient] += amount; emit Transfer(sender, recipient, amount); _afterTokenTransfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; } _totalSupply -= amount; emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} uint256[45] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./draft-IERC20PermitUpgradeable.sol"; import "../ERC20Upgradeable.sol"; import "../../../utils/cryptography/draft-EIP712Upgradeable.sol"; import "../../../utils/cryptography/ECDSAUpgradeable.sol"; import "../../../utils/CountersUpgradeable.sol"; import "../../../proxy/utils/Initializable.sol"; /** * @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. * * _Available since v3.4._ */ abstract contract ERC20PermitUpgradeable is Initializable, ERC20Upgradeable, IERC20PermitUpgradeable, EIP712Upgradeable { using CountersUpgradeable for CountersUpgradeable.Counter; mapping(address => CountersUpgradeable.Counter) private _nonces; // solhint-disable-next-line var-name-mixedcase bytes32 private _PERMIT_TYPEHASH; /** * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`. * * It's a good idea to use the same `name` that is defined as the ERC20 token name. */ function __ERC20Permit_init(string memory name) internal initializer { __Context_init_unchained(); __EIP712_init_unchained(name, "1"); __ERC20Permit_init_unchained(name); } function __ERC20Permit_init_unchained(string memory name) internal initializer { _PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");} /** * @dev See {IERC20Permit-permit}. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public virtual override { require(block.timestamp <= deadline, "ERC20Permit: expired deadline"); bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline)); bytes32 hash = _hashTypedDataV4(structHash); address signer = ECDSAUpgradeable.recover(hash, v, r, s); require(signer == owner, "ERC20Permit: invalid signature"); _approve(owner, spender, value); } /** * @dev See {IERC20Permit-nonces}. */ function nonces(address owner) public view virtual override returns (uint256) { return _nonces[owner].current(); } /** * @dev See {IERC20Permit-DOMAIN_SEPARATOR}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view override returns (bytes32) { return _domainSeparatorV4(); } /** * @dev "Consume a nonce": return the current value and increment. * * _Available since v4.1._ */ function _useNonce(address owner) internal virtual returns (uint256 current) { CountersUpgradeable.Counter storage nonce = _nonces[owner]; current = nonce.current(); nonce.increment(); } uint256[49] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../proxy/utils/Initializable.sol"; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract ContextUpgradeable is Initializable { function __Context_init() internal initializer { __Context_init_unchained(); } function __Context_init_unchained() internal initializer { } function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. * * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}. * * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity. */ abstract contract Initializable { /** * @dev Indicates that the contract has been initialized. */ bool private _initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private _initializing; /** * @dev Modifier to protect an initializer function from being invoked twice. */ modifier initializer() { require(_initializing || !_initialized, "Initializable: contract is already initialized"); bool isTopLevelCall = !_initializing; if (isTopLevelCall) { _initializing = true; _initialized = true; } _; if (isTopLevelCall) { _initializing = false; } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20Upgradeable { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address sender, address recipient, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./ECDSAUpgradeable.sol"; import "../../proxy/utils/Initializable.sol"; /** * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data. * * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible, * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding * they need in their contracts using a combination of `abi.encode` and `keccak256`. * * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA * ({_hashTypedDataV4}). * * The implementation of the domain separator was designed to be as efficient as possible while still properly updating * the chain id to protect against replay attacks on an eventual fork of the chain. * * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask]. * * _Available since v3.4._ */ abstract contract EIP712Upgradeable is Initializable { /* solhint-disable var-name-mixedcase */ bytes32 private _HASHED_NAME; bytes32 private _HASHED_VERSION; bytes32 private constant _TYPE_HASH = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"); /* solhint-enable var-name-mixedcase */ /** * @dev Initializes the domain separator and parameter caches. * * The meaning of `name` and `version` is specified in * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]: * * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol. * - `version`: the current major version of the signing domain. * * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart * contract upgrade]. */ function __EIP712_init(string memory name, string memory version) internal initializer { __EIP712_init_unchained(name, version); } function __EIP712_init_unchained(string memory name, string memory version) internal initializer { bytes32 hashedName = keccak256(bytes(name)); bytes32 hashedVersion = keccak256(bytes(version)); _HASHED_NAME = hashedName; _HASHED_VERSION = hashedVersion; } /** * @dev Returns the domain separator for the current chain. */ function _domainSeparatorV4() internal view returns (bytes32) { return _buildDomainSeparator(_TYPE_HASH, _EIP712NameHash(), _EIP712VersionHash()); } function _buildDomainSeparator( bytes32 typeHash, bytes32 nameHash, bytes32 versionHash ) private view returns (bytes32) { return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this))); } /** * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this * function returns the hash of the fully encoded EIP712 message for this domain. * * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example: * * ```solidity * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode( * keccak256("Mail(address to,string contents)"), * mailTo, * keccak256(bytes(mailContents)) * ))); * address signer = ECDSA.recover(digest, signature); * ``` */ function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) { return ECDSAUpgradeable.toTypedDataHash(_domainSeparatorV4(), structHash); } /** * @dev The hash of the name parameter for the EIP712 domain. * * NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs * are a concern. */ function _EIP712NameHash() internal virtual view returns (bytes32) { return _HASHED_NAME; } /** * @dev The hash of the version parameter for the EIP712 domain. * * NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs * are a concern. */ function _EIP712VersionHash() internal virtual view returns (bytes32) { return _HASHED_VERSION; } uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSAUpgradeable { /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { // Check the signature length // - case 65: r,s,v signature (standard) // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._ if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return recover(hash, v, r, s); } else if (signature.length == 64) { bytes32 r; bytes32 vs; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) vs := mload(add(signature, 0x40)) } return recover(hash, r, vs); } else { revert("ECDSA: invalid signature length"); } } /** * @dev Overload of {ECDSA-recover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { bytes32 s; uint8 v; assembly { s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) v := add(shr(255, vs), 27) } return recover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, `r` and `s` signature fields separately. */ function recover( bytes32 hash, 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. require( uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value" ); require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value"); // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); require(signer != address(0), "ECDSA: invalid signature"); return signer; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @title Counters * @author Matt Condon (@shrugs) * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number * of elements in a mapping, issuing ERC721 ids, or counting request ids. * * Include with `using Counters for Counters.Counter;` */ library CountersUpgradeable { struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { unchecked { counter._value += 1; } } function decrement(Counter storage counter) internal { uint256 value = counter._value; require(value > 0, "Counter: decrement overflow"); unchecked { counter._value = value - 1; } } function reset(Counter storage counter) internal { counter._value = 0; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC20Upgradeable.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20MetadataUpgradeable is IERC20Upgradeable { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20PermitUpgradeable { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
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Contract Security Audit
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Deployed Bytecode
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Multichain Portfolio | 30 Chains
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.