带有Bouncy Castle的AES 256bit加密：还需要无限力量政策？

问题描述

我想使用AES 256bit加密与，我想知道仍然需要BC，因为我收到一个 java.security.InvalidKeyException：以下代码的非法密钥大小异常：

I want to use AES 256bit encryption with Bouncy Castle and I'm wondering if the "Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files" are still required despite BC because I'm receiving a java.security.InvalidKeyException: Illegal key size exception for the following code:

public class AES256 {
    public static void main(String[] args) throws Exception {
        Security.addProvider(new BouncyCastleProvider());

        final KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(256); // doesn't work for 192, too

        final byte[] encoded = keyGen.generateKey().getEncoded();

        final SecretKeySpec keySpec = new SecretKeySpec(encoded, "AES");
        final Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding", "BC");
        // Please ignore static IV for this example
        final IvParameterSpec iv = new IvParameterSpec(new byte[]{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15});

        c.init(Cipher.ENCRYPT_MODE, keySpec, iv); // throws java.security.InvalidKeyException: Illegal key size
    }
}

我失踪了什么？有没有一个方法可以使用256位密钥，而没有无限力量策略文件？

What am I missing? Is there a way to use 256bit keys without the Unlimited Strength Policy files?

推荐答案

bouncycastle中的第一个问题。

First question in the bouncycastle FAQ.

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