Method hash

android/src/main/java/com/rnfs/RNFSManager.java:317–362

(String filepath, String algorithm, Promise promise)

  }

  @ReactMethod
  public void hash(String filepath, String algorithm, Promise promise) {
    try {
      Map<String, String> algorithms = new HashMap<>();

      algorithms.put("md5", "MD5");
      algorithms.put("sha1", "SHA-1");
      algorithms.put("sha224", "SHA-224");
      algorithms.put("sha256", "SHA-256");
      algorithms.put("sha384", "SHA-384");
      algorithms.put("sha512", "SHA-512");

      if (!algorithms.containsKey(algorithm)) throw new Exception("Invalid hash algorithm");

      File file = new File(filepath);

      if (file.isDirectory()) {
        rejectFileIsDirectory(promise);
        return;
      }

      if (!file.exists()) {
        rejectFileNotFound(promise, filepath);
        return;
      }

      MessageDigest md = MessageDigest.getInstance(algorithms.get(algorithm));

      FileInputStream inputStream = new FileInputStream(filepath);
      byte[] buffer = new byte[1024 * 10]; // 10 KB Buffer

      int read;
      while ((read = inputStream.read(buffer)) != -1) {
        md.update(buffer, 0, read);
      }

      StringBuilder hexString = new StringBuilder();
      for (byte digestByte : md.digest())
        hexString.append(String.format("%02x", digestByte));

      promise.resolve(hexString.toString());
    } catch (Exception ex) {
      ex.printStackTrace();
      reject(promise, filepath, ex);
    }
  }

  @ReactMethod
  public void moveFile(final String filepath, String destPath, ReadableMap options, final Promise promise) {