Function add64

packages/service-worker/cli/sha1.ts:69–73

([ah, al]: [number, number], [bh, bl]: [number, number])

}

function add64([ah, al]: [number, number], [bh, bl]: [number, number]): [number, number] {
  const [carry, l] = add32to64(al, bl);
  const h = add32(add32(ah, bh), carry);
  return [h, l];
}

function sub32(a: number, b: number): number {
  const low = (a & 0xffff) - (b & 0xffff);