protected SecretKey unwrapKey()

in sdk1/src/main/java/com/amazonaws/services/dynamodbv2/datamodeling/encryption/materials/WrappedRawMaterials.java [157:180]

• 20 lines of code
• 2 McCabe index (conditional complexity)

  protected SecretKey unwrapKey(
      Map<String, String> description, byte[] encryptedKey, String wrappingAlgorithm)
      throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
    if (unwrappingKey instanceof DelegatedKey) {
      return (SecretKey)
          ((DelegatedKey) unwrappingKey)
              .unwrap(
                  encryptedKey,
                  description.get(CONTENT_KEY_ALGORITHM),
                  Cipher.SECRET_KEY,
                  null,
                  wrappingAlgorithm);
    } else {
      Cipher cipher = Cipher.getInstance(wrappingAlgorithm);

      // This can be of the form "AES/256" as well as "AES" e.g.,
      // but we want to set the SecretKey with just "AES" in either case
      String[] algPieces = description.get(CONTENT_KEY_ALGORITHM).split("/", 2);
      String contentKeyAlgorithm = algPieces[0];

      cipher.init(Cipher.UNWRAP_MODE, unwrappingKey, Utils.getRng());
      return (SecretKey) cipher.unwrap(encryptedKey, contentKeyAlgorithm, Cipher.SECRET_KEY);
    }
  }