common hex.ts

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  export const fromBuffer = (buf: ArrayBuffer): string => {
  return Array.prototype.map.call(
    new Uint8Array(buf), 
    x => ('00' + x.toString(16)).slice(-2) // '00' is for left padding
  ).join('');
}
 
export const toBuffer = (hex: string): ArrayBuffer => {
  const arr = new Uint8Array(hex.length/2)
  for(let i=0; i < arr.length; i++) {
    arr[i] = parseInt(hex.slice(i*2, i*2 + 2), 16)
  }
  return arr.buffer
}