Abstract base class to inherit from if you want to create streams implementing the same API as node crypto Hash (for Cipher / Decipher check crypto-browserify/cipher-base).
const HashBase = require('hash-base');
const inherits = require('inherits');
// our hash function is XOR sum of all bytes
function MyHash () {
HashBase.call(this, 1); // in bytes
this._sum = 0x00;
};
inherits(MyHash, HashBase)
MyHash.prototype._update = function () {
for (let i = 0; i < this._block.length; ++i) {
this._sum ^= this._block[i];
}
};
MyHash.prototype._digest = function () {
return this._sum;
};
const data = Buffer.from([0x00, 0x42, 0x01]);
const hash = new MyHash().update(data).digest();
console.log(hash); // => 67
You also can check source code or crypto-browserify/md5.js
MIT