var key_256_buffer = Buffer.from(key_256);
// 128-bit, 192-bit and 256-bit keys
var key_128 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
var key_192 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23];
var key_256 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28,
29, 30, 31];
// or, you may use Uint8Array:
var key_128_array = new Uint8Array(key_128);
var key_192_array = new Uint8Array(key_192);
var key_256_array = new Uint8Array(key_256);
// or, you may use Buffer in node.js:
var key_128_buffer = Buffer.from(key_128);
var key_192_buffer = Buffer.from(key_192);
var key_256_buffer = Buffer.from(key_256);