Function addBigInt

packages/service-worker/worker/src/sha1.ts:192–207

(x: string, y: string)

// x and y decimal, lowest significant digit first
function addBigInt(x: string, y: string): string {
  let sum = '';
  const len = Math.max(x.length, y.length);
  for (let i = 0, carry = 0; i < len || carry; i++) {
    const tmpSum = carry + +(x[i] || 0) + +(y[i] || 0);
    if (tmpSum >= 10) {
      carry = 1;
      sum += tmpSum - 10;
    } else {
      carry = 0;
      sum += tmpSum;
    }
  }

  return sum;
}

function numberTimesBigInt(num: number, b: string): string {
  let product = '';