destenson / exodusmovement--buffer-noise

Expand a buffer to a specified length.

buffer-noise

Expand a buffer to a specified length. If the buffer is smaller than the specified length, the remaining space is filled with random bytes. A 32-bit Unsigned Big-Endian Integer containing the length of the data is always prepended to the buffer.

This module can be used for obfuscating an encrypted file's size for plausible deniability.

Installation

npm install buffer-noise

Usage

const size = 25
const { expand, shrink } = require('buffer-noise')(size)

const data = Buffer.from('Hello World!')
const newData = expand(data)
console.log(data, newData)
// Prints:
// <Buffer 48 65 6c 6c 6f 20 57 6f 72 6c 64 21>
// <Buffer 00 00 00 0c 48 65 6c 6c 6f 20 57 6f 72 6c 64 21 91 5c d3 2f>
assert(newData.length === size)
assert(shrink(newData).equals(data))

License

MIT