code: public ServiceFuture<AssetStorageEncryptionKeyInner> getEncryptionKeyAsync(String resourceGroupName, String accountName, String assetName, final ServiceCallback<AssetStorageEncryptionKeyInner> serviceCallback) {
          return ServiceFuture.fromResponse(getEncryptionKeyWithServiceResponseAsync(resourceGroupName, accountName, assetName), serviceCallback);
      }
docs: Gets the Asset storage key.
  Gets the Asset storage encryption keys used to decrypt content created by version 2 of the Media Services API.
  
  @param resourceGroupName The name of the resource group within the Azure subscription.
  @param accountName The Media Services account name.
  @param assetName The Asset name.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object