@Override
  public InputStream newDecryptingStream(InputStream ciphertextSource, byte[] associatedData)
      throws GeneralSecurityException, IOException {
    return rawStreamingAead.newDecryptingStream(ciphertextSource, associatedData);
  }
Covers the cases where users created their own streaming AEAD / key classes.
java_src/src/main/java/com/google/crypto/tink/streamingaead/internal/LegacyFullStreamingAead.java