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I'm trying to code a signature like opensea does for approving the Terms of Service. To do so I'm using the ECDSA library.

This code in javascript using ethers:

const message = ethers.utils.solidityKeccak256(
  ['address'],
  [
    '0x00cF2CFA50bD1434C65F00Bf80867499492f5639',
  ],
)
console.log(message)

Gives me a different output as this code in Solidity:

address owner = 0x00cF2CFA50bD1434C65F00Bf80867499492f5639;
bytes32 public message = keccak256(
    abi.encodePacked(owner)
);

why is it so?

I checked this post and this one but they don't help me since they use WEB3 and I use ethers.

Loo
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  • What hashes do you have in both cases? – FLCL Mar 14 '23 at 16:49
  • ethers.js gives: 0x661483957cd349fdb3dba77e9ca622510d2429df42eba774af2c8ebf8fd6fad7

    solidity gives: 0x5380c7b7ae81a58eb98d9c78de4a1fd7fd9535fc953ed2be602daaa41767312a

     – Loo Mar 14 '23 at 17:21
  • your address has the wrong checksum, https://ethsum.netlify.app/ – Majd TL Mar 20 '23 at 08:05

1 Answers1

2

Tried this:

// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.9.0;

contract Test1 {
  address owner = 0x00cF2cfa50BD1434C65f00Bf80867499492F5639;
  bytes32 message = keccak256(
      abi.encodePacked(owner)
  );


function test() public view returns (bytes32) {
    return message;
  }
}

and the result = 0x661483957cd349fdb3dba77e9ca622510d2429df42eba774af2c8ebf8fd6fad7 is the same as for ethers.

Btw solidity says owner's address is not good in terms of checksum. The example fixes that.

FLCL
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