使用弹性城堡在Java中加密xml文件的示例 [英] An example of encrypting an xml file in Java using bouncy castle

问题描述

任何人都可以使用弹跳城堡来显示（或提供一个链接）如何使用Java加密文件的示例？我看过bouncycastle.org但找不到任何API文件。即使只是知道要使用哪些类，对我来说将是一个很大的帮助！

Can anyone show me (or provide a link to) an example of how to encrypt a file in Java using bouncy castle? I've looked over bouncycastle.org but cannot find any documentation of their API. Even just knowing which classes to use would be a big help for me to get started!

推荐答案

你想要什么类型的加密去表演？基于密码（PBE），对称，不对称？您的所有内容如何配置密码。

What type of encryption do you want to perform? Password-based (PBE), symmetric, asymmetric? Its all in how you configure the Cipher.

您不必使用任何BouncyCastle特定的API，只需使用它提供的算法。这是一个使用BouncyCastle PBE密码加密字符串的示例：

You shouldn't have to use any BouncyCastle specific APIs, just the algorithms it provides. Here is an example that uses the BouncyCastle PBE cipher to encrypt a String:

import java.security.SecureRandom;
import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class PBE {

    private static final String salt = "A long, but constant phrase that will be used each time as the salt.";
    private static final int iterations = 2000;
    private static final int keyLength = 256;
    private static final SecureRandom random = new SecureRandom();

    public static void main(String [] args) throws Exception {
        Security.insertProviderAt(new BouncyCastleProvider(), 1);

        String passphrase = "The quick brown fox jumped over the lazy brown dog";
        String plaintext = "hello world";
        byte [] ciphertext = encrypt(passphrase, plaintext);
        String recoveredPlaintext = decrypt(passphrase, ciphertext);

        System.out.println(recoveredPlaintext);
    }

    private static byte [] encrypt(String passphrase, String plaintext) throws Exception {
        SecretKey key = generateKey(passphrase);

        Cipher cipher = Cipher.getInstance("AES/CTR/NOPADDING");
        cipher.init(Cipher.ENCRYPT_MODE, key, generateIV(cipher), random);
        return cipher.doFinal(plaintext.getBytes());
    }

    private static String decrypt(String passphrase, byte [] ciphertext) throws Exception {
        SecretKey key = generateKey(passphrase);

        Cipher cipher = Cipher.getInstance("AES/CTR/NOPADDING");
        cipher.init(Cipher.DECRYPT_MODE, key, generateIV(cipher), random);
        return new String(cipher.doFinal(ciphertext));
    }

    private static SecretKey generateKey(String passphrase) throws Exception {
        PBEKeySpec keySpec = new PBEKeySpec(passphrase.toCharArray(), salt.getBytes(), iterations, keyLength);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWITHSHA256AND256BITAES-CBC-BC");
        return keyFactory.generateSecret(keySpec);
    }

    private static IvParameterSpec generateIV(Cipher cipher) throws Exception {
        byte [] ivBytes = new byte[cipher.getBlockSize()];
        random.nextBytes(ivBytes);
        return new IvParameterSpec(ivBytes);
    }

}

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