crypto randomfillsync buffer offset size

• buffer {Buffer|TypedArray|DataView} Must be supplied.
• offset {number} Default: 0
• size {number} Default: buffer.length - offset
• Returns: {Buffer|TypedArray|DataView} The object passed as buffer argument.

Synchronous version of [crypto.randomFill()][].

const buf = Buffer.alloc(10);
console.log(crypto.randomFillSync(buf).toString('hex'));
crypto.randomFillSync(buf, 5);
console.log(buf.toString('hex'));
// The above is equivalent to the following:
crypto.randomFillSync(buf, 5, 5);
console.log(buf.toString('hex'));

Any TypedArray or DataView instance may be passed as buffer.

const a = new Uint32Array(10);
console.log(Buffer.from(crypto.randomFillSync(a).buffer,
                        a.byteOffset, a.byteLength).toString('hex'));
const b = new Float64Array(10);
console.log(Buffer.from(crypto.randomFillSync(b).buffer,
                        b.byteOffset, b.byteLength).toString('hex'));
const c = new DataView(new ArrayBuffer(10));
console.log(Buffer.from(crypto.randomFillSync(c).buffer,
                        c.byteOffset, c.byteLength).toString('hex'));