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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