84 lines
2.3 KiB
Solidity
84 lines
2.3 KiB
Solidity
// SPDX-License-Identifier: GPL-3.0-only
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pragma solidity >=0.6.0;
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pragma experimental ABIEncoderV2;
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// note that this file is not synced with DeriveEip712Test.json
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contract DeriveEip712Test {
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uint256 constant chainId = 1;
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bytes32 constant salt = keccak256("eip712-test-75F0CCte");
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bytes32 constant EIP712_DOMAIN_TYPEHASH =
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keccak256(
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"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract,bytes32 salt)"
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);
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bytes32 constant FOOBAR_DOMAIN_TYPEHASH =
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keccak256(
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"FooBar(int256 foo,uint256 bar,bytes fizz,bytes32 buzz,string far,address out)"
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);
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struct FooBar {
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int256 foo;
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uint256 bar;
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bytes fizz;
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bytes32 buzz;
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string far;
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address out;
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}
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constructor() public {}
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function domainSeparator() public pure returns (bytes32) {
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return
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keccak256(
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abi.encode(
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EIP712_DOMAIN_TYPEHASH,
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keccak256("Eip712Test"),
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keccak256("1"),
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chainId,
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address(0x0000000000000000000000000000000000000001),
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salt
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)
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);
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}
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function typeHash() public pure returns (bytes32) {
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return FOOBAR_DOMAIN_TYPEHASH;
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}
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function structHash(FooBar memory fooBar) public pure returns (bytes32) {
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return
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keccak256(
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abi.encode(
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typeHash(),
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uint256(fooBar.foo),
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fooBar.bar,
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keccak256(fooBar.fizz),
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fooBar.buzz,
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keccak256(bytes(fooBar.far)),
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fooBar.out
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)
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);
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}
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function encodeEip712(FooBar memory fooBar) public pure returns (bytes32) {
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return
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keccak256(
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abi.encodePacked(
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"\x19\x01",
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domainSeparator(),
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structHash(fooBar)
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)
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);
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}
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function verifyFooBar(
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address signer,
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FooBar memory fooBar,
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bytes32 r,
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bytes32 s,
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uint8 v
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) public pure returns (bool) {
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return signer == ecrecover(encodeEip712(fooBar), v, r, s);
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}
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}
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