box-ui-elements/es/utils/webcrypto.js

Box UI Elements

import sha1 from 'js-sha1';
/**
 * 
 * @file Wrapper to provide a consistent interface for the webcrypto API
 * @author Box
 */

/**
 * Returns the correct crypto library based on browser implementation
 *
 * @return {Object}
 */
function getCrypto() {
  return window.crypto || window.msCrypto;
}

/**
 * Returns a Promise of a digest generated from the
 * hash function and text given as parameters
 *
 * @param {string} algorithm
 * @param {ArrayBuffer} buffer
 * @return {Promise} Promise - resolves with an ArrayBuffer containing the digest result
 */
function digest(algorithm, buffer) {
  const cryptoRef = getCrypto();
  if (cryptoRef !== window.msCrypto) {
    return cryptoRef.subtle.digest(algorithm, buffer);
  }

  // IE11 implements an early version of the SubtleCrypto interface which doesn't use Promises
  // See http://web-developer-articles.blogspot.com/2015/05/web-cryptography-api.html
  return new Promise((resolve, reject) => {
    // Microsoft has dropped support for SHA-1 and so SHA-1 needs to be calculated differently
    if (algorithm === 'SHA-1') {
      try {
        const hashBuffer = sha1.arrayBuffer(buffer);
        resolve(hashBuffer);
      } catch (e) {
        reject(e);
      }
    } else {
      const cryptoOperation = cryptoRef.subtle.digest({
        name: algorithm
      }, buffer);
      cryptoOperation.oncomplete = event => {
        resolve(event.target.result);
      };
      cryptoOperation.onerror = reject;
    }
  });
}

/**
 * Given a buffer/byteArray fills it with random values and returns the same array
 *
 * @param {Uint8Array} buffer
 * @return {Uint8Array}
 */
function getRandomValues(buffer) {
  const cryptoRef = getCrypto();
  const copy = new Uint8Array(buffer);
  cryptoRef.getRandomValues(copy);
  return copy;
}
export { getCrypto, digest, getRandomValues };
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