@AccessesPartialKey
  private static com.google.crypto.tink.streamingaead.AesCtrHmacStreamingKey
      createAesCtrHmacStreamingKey(
          AesCtrHmacStreamingParameters parameters, @Nullable Integer idRequirement)
          throws GeneralSecurityException {
    return com.google.crypto.tink.streamingaead.AesCtrHmacStreamingKey.create(
        parameters, SecretBytes.randomBytes(parameters.getKeySizeBytes()));
  }
This key manager generates new {@code AesCtrHmacStreamingKey} keys and produces new instances of
{@code AesCtrHmacStreaming}.
java_src/src/main/java/com/google/crypto/tink/streamingaead/AesCtrHmacStreamingKeyManager.java