如何安装无限强度辖区策略文件？

Question

有人可以向我解释如何安装无限强度管辖权策略文件。我从Oracle网站下载了.jar文件，但安装时遇到了问题。我正在制作的Java程序不断给我这个错误：

Jan 11, 2017 12:32:31 AM com.subgraph.orchid.TorClient start
INFO: Starting Orchid (version: 1.0.0)
Jan 11, 2017 12:32:31 AM com.subgraph.orchid.TorClient verifyUnlimitedStrengthPolicyInstalled
SEVERE: Unlimited Strength Jurisdiction Policy Files are required but not installed.
Exception in thread "main" com.subgraph.orchid.TorException: Unlimited Strength Jurisdiction Policy Files are required but not installed.
    at com.subgraph.orchid.TorClient.verifyUnlimitedStrengthPolicyInstalled(TorClient.java:208)
    at com.subgraph.orchid.TorClient.start(TorClient.java:79)
    at com.nikola.WebCrawlerApp.App$OrchidDemo.startOrchid(App.java:46)
    at com.nikola.WebCrawlerApp.App$OrchidDemo.access$000(App.java:38)
    at com.nikola.WebCrawlerApp.App.main(App.java:35)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

Answer 1

您需要确定Java主目录路径（通过System.getenv("JAVA_HOME")Java或$ echo $JAVA_HOME在命令行上）。它应该是如下路径：

• C:\Program Files\Java\jre8 在Windows上
• /Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home 在Mac OS X上
• /usr/java/jdk1.8.0_101/bin/java 在* nix上

然后，您需要将下载的US_export_policy.jar和local_policy.jar文件复制到目录中：<JAVA_HOME>/jre/lib/security并覆盖同名的现有文件。

更新了05/17/17

以下代码（仅出于演示目的）将指示JVM，无论安装了什么策略文件，都允许使用AES-256位加密和相应的TLS密码。这是 不建议 采用这种方法。

if (Cipher.getMaxAllowedKeyLength("AES") < 256) {
  try {
    Field field = Class.forName("javax.crypto.JceSecurity").
    getDeclaredField("isRestricted");
    field.setAccessible(true);
    field.set(null, java.lang.Boolean.FALSE);
  } catch (Exception e) {
    fail("Could not override JCE cryptography strength policy setting");
    fail(e.getMessage());
  }
}