Using CryptoJS

I’m trying to test this library to see how I could use it with CryptoJS alongside other stuff and it seems to not like it even when I convert the hashes into buffers

test('Simple', () => {
  const data = ['Lorem', 'Ipsum', 'Dolore', 'Sit', 'Amet'];
  const leaves = data.map(d => Buffer.from(SHA256(d).toString(), 'hex'));
  console.log(leaves);
  let tree = new MerkelTree(leaves, SHA256);
}

I get this error:

TypeError [ERR_INVALID_ARG_TYPE]: The "list[0]" argument must be one of type Array, Buffer, or Uint8Array. Received type object
    at Function.concat (buffer.js:479:13)
    at MerkleTree.createHashes (/home/maxie/Dropbox/Projects/SaCoin/node_modules/merkletreejs/index.js:57:23)
    at MerkleTree.createHashes (/home/maxie/Dropbox/Projects/SaCoin/node_modules/merkletreejs/index.js:86:10)
    at new MerkleTree (/home/maxie/Dropbox/Projects/SaCoin/node_modules/merkletreejs/index.js:37:10)
    at Object.<anonymous>.test (/home/maxie/Dropbox/Projects/SaCoin/tests/MerkelTree.test.js:9:14)
    at Object.asyncFn (/home/maxie/Dropbox/Projects/SaCoin/node_modules/jest-jasmine2/build/jasmine_async.js:108:37)
    at resolve (/home/maxie/Dropbox/Projects/SaCoin/node_modules/jest-jasmine2/build/queue_runner.js:56:12)
    at new Promise (<anonymous>)
    at mapper (/home/maxie/Dropbox/Projects/SaCoin/node_modules/jest-jasmine2/build/queue_runner.js:43:19)
    at promise.then (/home/maxie/Dropbox/Projects/SaCoin/node_modules/jest-jasmine2/build/queue_runner.js:87:41)

This error says that the leave inputs aren’t buffers but they are (confirmed by expect(leaves[0] instanceof Buffer).toBeTruthy(); passing) so I’m perplexed as to why that is happening?

I don’t want to use crypto because all the crypto functions in my project are based on CryptoJS and work perfectly well.

[miguelmota]

Although the CryptoJS constructor type is called Buffer, CryptoJS buffers are not actually native Node.js buffers which is what’s causing the error.

console.log(Buffer.isBuffer(SHA256('hello'))) // false

To get around this you can wrap the hashing function in order to return a Buffer.

const SHA256 = require('crypto-js/sha256')
const MerkleTree = require('merkletreejs')

const bufferify = f => x => Buffer.from(f(x.toString()).toString(), 'hex')

const hashFn = bufferify(SHA256)
const leaves = ['a', 'b', 'c'].map(hashFn)
const tree = new MerkleTree(leaves, hashFn)

console.log(tree)

We should however support CryptoJS in a future release

@Berkmann18 @DonleeIO

[miguelmota]

Latest release supports CryptoJS algos