Function getRandomString64

src/service/cid-impl.js:709–723

(win)

 * @return {!Promise<string>} The cid
 */
export function getRandomString64(win) {
  const entropy = getEntropy(win);
  if (typeof entropy == 'string') {
    return Services.cryptoFor(win).sha384Base64(entropy);
  } else {
    // If our entropy is a pure random number, we can just directly turn it
    // into base 64
    const cast = /** @type {!Uint8Array} */ (entropy);
    return tryResolve(() =>
      base64UrlEncodeFromBytes(cast)
        // Remove trailing padding
        .replace(/\.+$/, '')
    );
  }
}

/**
 * @param {!./ampdoc-impl.AmpDoc} ampdoc