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tweak erc20

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This commit is contained in:
Noah Zinsmeister
2019-12-08 15:06:54 -05:00
parent d9dec32a8b
commit f4ab1b2fe0
2 changed files with 13 additions and 23 deletions
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4
contracts/interfaces/IERC20.sol
View File

@ -16,13 +16,11 @@ interface IERC20 {
function nonces(address owner) external view returns (uint);
function transfer(address to, uint value) external returns (bool);
function burn(uint value) external;
function approve(address spender, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function burn(uint value) external;
function burnFrom(address from, uint value) external;
function approveMeta(
address owner, address spender, uint value, uint nonce, uint expiration, uint8 v, bytes32 r, bytes32 s
)

32
contracts/token/ERC20.sol
View File

@ -1,7 +1,6 @@
pragma solidity 0.5.13;
import "../interfaces/IERC20.sol";
import "../libraries/SafeMath.sol";
contract ERC20 is IERC20 {
@ -16,7 +15,7 @@ contract ERC20 is IERC20 {
bytes32 public DOMAIN_SEPARATOR;
// keccak256("Approve(address owner,address spender,uint256 value,uint256 nonce,uint256 expiration)");
bytes32 public constant APPROVE_TYPEHASH = hex'25a0822e8c2ed7ff64a57c55df37ff176282195b9e0c9bb770ed24a300c89762';
bytes32 public constant APPROVE_TYPEHASH = hex"25a0822e8c2ed7ff64a57c55df37ff176282195b9e0c9bb770ed24a300c89762";
mapping (address => uint) public nonces;
event Transfer(address indexed from, address indexed to, uint value);
@ -30,7 +29,9 @@ contract ERC20 is IERC20 {
name = _name;
symbol = _symbol;
decimals = _decimals;
if (_totalSupply > 0) mint(msg.sender, _totalSupply);
if (_totalSupply > 0) {
mint(msg.sender, _totalSupply);
}
DOMAIN_SEPARATOR = keccak256(abi.encode(
keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
keccak256(bytes(name)),
@ -84,27 +85,18 @@ contract ERC20 is IERC20 {
{
require(nonce == nonces[owner]++, "ERC20: INVALID_NONCE");
// solium-disable-next-line security/no-block-members
require(expiration > block.timestamp, "ERC20: EXPIRED_SIGNATURE");
require(v == 27 || v == 28, "ECDSA: INVALID_V");
require(uint(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: INVALID_S");
require(expiration > block.timestamp, "ERC20: EXPIRED");
require(v == 27 || v == 28, "ERC20: INVALID_V");
require(uint(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ERC20: INVALID_S");
bytes32 digest = keccak256(abi.encodePacked(
hex'19',
hex'01',
hex"19",
hex"01",
DOMAIN_SEPARATOR,
keccak256(abi.encode(
APPROVE_TYPEHASH, owner, spender, value, nonce, expiration
))
keccak256(abi.encode(APPROVE_TYPEHASH, owner, spender, value, nonce, expiration))
));
address recoveredAddress = ecrecover(digest, v, r, s);
if (recoveredAddress != owner) {
recoveredAddress = ecrecover(
keccak256(abi.encodePacked(hex"19", "Ethereum Signed Message:", hex"32", digest)), v, r, s
);
}
require(recoveredAddress != address(0), "ERC20: INVALID_RECOVERED_ADDRESS");
require(recoveredAddress == owner, "ERC20: INVALID_SIGNATURE");
require(recoveredAddress != address(0), "ERC20: INVALID_SIGNATURE");
require(recoveredAddress == owner, "ERC20: INVALID_ADDRESS");
_approve(owner, spender, value);
}