var Buffer = require('buffer').Buffer; var intSize = 4; var zeroBuffer = Buffer.alloc(intSize); zeroBuffer.fill(0); var chrsz = 8; function toArray(buf, bigEndian) { if (buf.length % intSize !== 0) { var len = buf.length + (intSize - (buf.length % intSize)); buf = Buffer.concat([buf, zeroBuffer], len); } var arr = []; var fn = bigEndian ? buf.readInt32BE : buf.readInt32LE; for (var i = 0; i < buf.length; i += intSize) { arr.push(fn.call(buf, i)); } return arr; } function toBuffer(arr, size, bigEndian) { var buf = Buffer.alloc(size); var fn = bigEndian ? buf.writeInt32BE : buf.writeInt32LE; for (var i = 0; i < arr.length; i++) { fn.call(buf, arr[i], i * 4, true); } return buf; } function hash(buf, fn, hashSize, bigEndian) { if (!Buffer.isBuffer(buf)) buf = Buffer.from(buf); var arr = fn(toArray(buf, bigEndian), buf.length * chrsz); return toBuffer(arr, hashSize, bigEndian); } module.exports = { hash: hash };