cyclical-object-hash

cylical-object-hash

Hash a cyclical object deterministically using blake2b.

Why?

There are so many of these, so why yet another object hashing library? I found all the other options lacking in one or another way. They all failed in at least one of the following ways:

1. Did not have a deterministic stringification step.
2. Broke on cyclical references.
3. Used an insecure hashing algorithm such as md5 or sha1 instead of blake2b.
4. Limited to Node.js
5. Too hard to find on NPM.

Usage

const objectHash = require('cylical-object-hash')

let exampleObject = {
  "@context": "http://schema.org",
  "@type": "Book",
  "copyrightHolder": {
    "@type": "Organization",
    "name": "Holt, Rinehart and Winston"
  },
  "copyrightYear": "2007",
  "description": "NIMAC-sourced textbook",
  "genre": "Educational Materials",
  "inLanguage": "en-US",
  "isFamilyFriendly": "true",
  "isbn": "9780030426599",
  "name": "Holt Physical Science",
  "numberOfPages": "598",
  "publisher": {
    "@type": "Organization",
    "name": "Holt, Rinehart and Winston"
  }
}

objectHash.hex(exampleObject)
// '79fc74f0dd70d955a7d61271d09f0806aadff55ea770621cbb9a9194e9b9053cc59c3ca669b273dd0fb1a0efc4617d2c9824a339ad0200fdbd231b549f946027'

objectHash(exampleObject)
// Uint8Array 
// Blake2b { digestLength: 64, finalized: false, pointer: 64 }

API

objectHash(obj)

This takes an ordinary object and will deterministically hash it via blake2b. It returns a Uint8Array by default.

.hex(obj)

This takes an ordinary object and will deterministically hash it via blake2b. Unlike the function above, it returns it as a hex string.

Installation

$ npm install cyclical-object-hash

License

MIT