private static final void validate(AesEaxParameters parameters) throws GeneralSecurityException {
    if (parameters.getKeySizeBytes() == 24) {
      throw new GeneralSecurityException("192 bit AES GCM Parameters are not valid");
    }
  }
This key manager generates new {@code AesEaxKey} keys and produces new instances of {@code
AesEaxJce}.
java_src/src/main/java/com/google/crypto/tink/aead/AesEaxKeyManager.java