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Nika Kurashvili
Nika Kurashvili

Reputation: 6474

keccak256 doesn't return buffer

I have the following:

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

keccak256 is imported from ethereumjs-utils

It seems like that keccak256 returns Buffer.

What I am trying to do is I want to change keccak256 from ethereumjs-utils to ethers/lib/utils, but new keccak256 doesn't return buffer. I tried lots of things, but the results are different. any ideas ? The final result should be that combinedHash function returns the same thing in the end so it should return Buffer.

Any ideas ?

Upvotes: 1

Views: 433

Answers (1)

Petr Hejda
Petr Hejda

Reputation: 43581

ethers/lib/utils function keccak256() returns 0x prefixed hex string representation of the hash.

So you need to create a buffer from this hex without the 0x prefix.

const keccakString = keccak256(MerkleTree.sortAndConcat(first, second))
return Buffer.from(keccakString.slice('0x'.length), 'hex')

Upvotes: 1

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