transform from ethereumjs-util keccak256 to ethers.js keccak256

static combinedHash(first: Buffer, second: Buffer): Buffer {
    if (!first) {
      return second
    }
    if (!second) {
      return first
    }
    return keccak256(MerkleTree.sortAndConcat(first, second))
  }

This is what I am using with ethereumjs-util's keccak256. All seems well and it’s working, but the idea is that keccak256 returns Buffer , so that’s why I have Buffer as returned type for combinedHash function. All works.

Now I want to get rid of ethereumjs-utils and use ethers.js’s keccak256. So I do this, but ,the problem arises.

• The first problem is that i can’t pass Buffer to keccak256
• The second problem is it returns string instead of Buffer. If I try to transform the returned data into buffer by myself with Buffer.from, it produces the different buffer and my tests start to fail.

How can I fix those ? Any help would be appreciated.

[novaknole]

I fixed it…

I think I was missing arrayify in the middle.

This is what made it work:

return Buffer.from(arrayify(keccak256(MerkleTree.sortAndConcat(first, second))))

Thanks a lot for all the help , especially this quick.

Best of luck.

[ricmoo]

Oh. Is that being returned from a function? I think it’s complaining about the return type from your function, not ethers. You need to either specify your function returns a string, or use Buffer.from(arrayify(v)), maybe?