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export function str2bytes(str: string): Uint8Array {  const encoder = new TextEncoder();  return encoder.encode(str);}
export function hex(bytes: Uint8Array): string {  let output = "";  for (const b of bytes) output += b.toString(16).padStart(2, "0");  return output;}
export function xor(a: Uint8Array, b: Uint8Array) {  const c = new Uint8Array(a.length);  for (let i = 0; i < c.length; i++) {    c[i] = a[i] ^ b[i % b.length];  }  return c;}
export function concat(...arg: (Uint8Array | number[])[]) {  const length = arg.reduce((a, b) => a + b.length, 0);  const c = new Uint8Array(length);  let ptr = 0;  for (let i = 0; i < arg.length; i++) {    c.set(arg[i], ptr);    ptr += arg[i].length;  }
  return c;}
export function bignum_to_byte(n: bigint): number[] {  const bytes = [];  while (n > 0) {    bytes.push(Number(n & 255n));    n = n >> 8n;  }
  bytes.reverse();  return bytes;}
export function random_bytes(length: number): Uint8Array {  const n = new Uint8Array(length);  for (let i = 0; i < length; i++) n[i] = ((Math.random() * 254) | 0) + 1;  return n;}
export function get_key_size(n: bigint): number {  const size_list = [64n, 128n, 256n, 512n, 1024n];
  for (const size of size_list) {    if (n < (1n << size * 8n)) return Number(size);  }
  return 2048;}
export function base64_to_binary(b: string): Uint8Array {  let binaryString = window.atob(b);  let len = binaryString.length;  let bytes = new Uint8Array(len);
  for (var i = 0; i < len; i++) {    bytes[i] = binaryString.charCodeAt(i);  }
  return bytes;}