用Bouncy Castle实现AES-128-CBC加密解密

Bouncy Castle Crypto APIs 是一个开源的轻量级Java 加密解密包，实现了JCE/JCA的provider，支持AES等多种加密解密算法。
详情请见主页：http://www.bouncycastle.org/java.html
本文的示例代码使用了 http://www.bouncycastle.org/download/bcprov-jdk16-139.jar
1）使用JCE的 AES-128-CBC加密解密
下载: AESWithJCE.java

   1. package com.albertsong.aes;
   2. 
   3. import java.security.Key;
   4. import java.security.Security;
   5. 
   6. import javax.crypto.Cipher;
   7. import javax.crypto.spec.IvParameterSpec;
   8. import javax.crypto.spec.SecretKeySpec;
   9. 
  10. import org.bouncycastle.jce.provider.BouncyCastleProvider;
  11. import org.bouncycastle.util.encoders.Hex;
  12. 
  13. /**
  14. * @author Albert
  15. * @version 1.0
  16. *
  17. */
  18. public class AESWithJCE {
  19. 
  20.     /**
  21.      * @param args
  22.      */
  23.     public static void main(String[] args) {
  24.         byte[] keybytes = { 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
  25.                 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38 };
  26.         byte[] iv = { 0x38, 0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31, 0x38,
  27.                 0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31 };
  28.         String content ="TEST1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  29.         System.out.println("Original content:");
  30.         System.out.println(content);
  31.         try {
  32.             Security.addProvider(new BouncyCastleProvider());
  33.             Key key = new SecretKeySpec(keybytes, "AES");
  34.             Cipher in = Cipher.getInstance("AES/CBC/PKCS7Padding","BC");
  35.             in.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(iv));
  36.             byte[] enc = in.doFinal(content.getBytes());
  37.             System.out.println("Encrypted Content:");
  38.             System.out.println(new String(Hex.encode(enc)));
  39.           
  40.             Cipher out = Cipher.getInstance("AES/CBC/PKCS7Padding", "BC");
  41.             out.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
  42.             byte[] dec = out.doFinal(enc);
  43.             System.out.println("Decrypted Content:");
  44.             System.out.println(new String(dec));
  45.         } catch (Exception ex) {
  46.             ex.printStackTrace();
  47.         }
  48. 
  49.     }
  50. 
  51. }