eth的签名ecrecover签名可以吧三个参数v，s，r写成一个吗

v，s，r这三个参数是链下私钥签名签出来的，传给合约，但是一般合约对参数数量有限制，参数太多就出现

Stack too deep, try removing local variables

有没有办法可以不传三个，只传一个也能实现这个功能？

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分类：智能合约

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1 个回答

tengdw 2022-09-15 17:55

这三个参数可以合成一个传给合约然后在合约里面做分割
```
function test(address owner, address sender, uint256 amount, bytes calldata sign) public {
    bytes32 digest = keccak256(abi.encodePacked(keccak256(abi.encode(sender, amount))));
    require(ecrecovery(digest, sign) == owner, "Sign Validation Failed");
}

function ecrecovery(bytes32 hash, bytes memory sig) private pure returns (address) {
    bytes32 r;
    bytes32 s;
    uint8 v;

if (sig.length != 65) {
    return address(0);
    }

assembly {
    r := mload(add(sig, 32))
    s := mload(add(sig, 64))
    v := and(mload(add(sig, 65)), 255)
    }

// https://github.com/ethereum/go-ethereum/issues/2053
    if (v < 27) {
    v += 27;
    }

if (v != 27 && v != 28) {
    return address(0);
    }

/* prefix might be needed for geth only
    * https://github.com/ethereum/go-ethereum/issues/3731
    */
    // bytes memory prefix = "\x19Ethereum Signed Message:\n32";
    // hash = sha3(prefix, hash);

return ecrecover(hash, v, r, s);
}
```