Method createDigest

src/Encoder/Hash.js:99–135

* Creates message digest using given algorithm. * @protected * @param {string} name Algorithm name * @param {Uint8Array} message Message bytes * @return {Promise}

(name, message)

   * @return {Promise}
   */
  createDigest (name, message) {
    const algorithm = algorithms.find(algorithm => algorithm.name === name)

    switch (name) {
      case 'md5':
        return new Promise(resolve => resolve(md5(message)))
    }

    if (EnvUtil.isNode()) {
      // Create message digest using Node Crypto async
      return new Promise((resolve, reject) => {
        const resultBuffer =
          nodeCrypto.createHash(algorithm.nodeAlgorithm)
            .update(global.Buffer.from(message))
            .digest()
        resolve(new Uint8Array(resultBuffer))
      })
    } else {
      // Get crypto subtle instance
      const crypto = window.crypto || window.msCrypto
      const cryptoSubtle = crypto.subtle || crypto.webkitSubtle

      // Create message digest using Web Crypto Api
      let result = cryptoSubtle.digest(algorithm.browserAlgorithm, message)

      // IE11 exception
      if (result.oncomplete !== undefined) {
        // Wrap IE11 CryptoOperation object in a promise
        result = new Promise((resolve, reject) => {
          result.oncomplete = resolve.bind(this, result.result)
          result.onerror = reject
        })
      }

      return result.then(buffer => new Uint8Array(buffer))
    }
  }

  /**
   * Returns algorithm objects available in the current environment.