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import { sha256 } from './crypto.ts'
export const equal = (a: ArrayBuffer, b: ArrayBuffer) => {  if (a === b) {    return true  }  if (a.byteLength !== b.byteLength) {    return false  }
  const va = new DataView(a)  const vb = new DataView(b)
  let i = va.byteLength  while (i--) {    if (va.getUint8(i) !== vb.getUint8(i)) {      return false    }  }
  return true}
export const timingSafeEqual = async (  a: string | object | boolean,  b: string | object | boolean,  hashFunction?: Function) => {  if (!hashFunction) {    hashFunction = sha256  }
  const sa = await hashFunction(a)  const sb = await hashFunction(b)
  if (!sa || !sb) {    return false  }
  return sa === sb && a === b}
export const bufferToString = (buffer: ArrayBuffer): string => {  if (buffer instanceof ArrayBuffer) {    const enc = new TextDecoder('utf-8')    return enc.decode(buffer)  }  return buffer}
export const bufferToFormData = (arrayBuffer: ArrayBuffer, contentType: string) => {  const response = new Response(arrayBuffer, {    headers: {      'Content-Type': contentType,    },  })  return response.formData()}