Calculating SHA-1 in the Browser

sha-1.js

async function sha1(str) {
  const buffer = new TextEncoder("utf-8").encode(str);
  const hash = await crypto.subtle.digest('SHA-1', buffer)
  const hexCodes = [];
  const view = new DataView(hash);
  for (let i = 0; i < view.byteLength; i += 1) {
    const byte = view.getUint8(i).toString(16).padStart(2, '0')
    hexCodes.push(byte);
  }
  return hexCodes.join('');
}

// await sha1('hello, world!')
// outputs: 1f09d30c707d53f3d16c530dd73d70a6ce7596a9