Bouncy Castle Crypto APIs 是一個開源的輕量級Java 加密解密包，實現了JCE/JCA的provider，支持AES等多種加密解密算法。
詳情請見主頁：http://www.bouncycastle.org/java.html
本文的示例代碼使用了http://www.bouncycastle.org/download/bcprov-jdk16-139.jar
1）使用JCE的AES-128-CBC加密解密

Java代碼 ?

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. }??

?2）不使用JCE的AES-128-CBC加密解密，可以用于J2ME程序中。

Java代碼 ?

1. package ?com.albertsong.aes;??
2. ??
3. import ?org.bouncycastle.crypto.BufferedBlockCipher;??
4. import ?org.bouncycastle.crypto.engines.AESFastEngine;??
5. import ?org.bouncycastle.crypto.modes.CBCBlockCipher;??
6. import ?org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;??
7. import ?org.bouncycastle.crypto.params.KeyParameter;??
8. import ?org.bouncycastle.crypto.params.ParametersWithIV;??
9. import ?org.bouncycastle.util.encoders.Hex;??
10. ??
11. /** ?
12. ?*?@author?Albert ?
13. ?*?@version?1.0 ?
14. ?* ?
15. ?*/ ??
16. public ? class ?AESWithoutJCE?{??
17. ??
18. ???? /** ?
19. ?????*?@param?args ?
20. ?????*/ ??
21. ???? public ? static ? void ?main(String[]?args)?{??
22. ???????? byte []?keybytes?=?{? 0x31 ,? 0x32 ,? 0x33 ,? 0x34 ,? 0x35 ,? 0x36 ,? 0x37 ,? 0x38 ,??
23. ???????????????? 0x31 ,? 0x32 ,? 0x33 ,? 0x34 ,? 0x35 ,? 0x36 ,? 0x37 ,? 0x38 ?};??
24. ???????? byte []?iv?=?{? 0x38 ,? 0x37 ,? 0x36 ,? 0x35 ,? 0x34 ,? 0x33 ,? 0x32 ,? 0x31 ,? 0x38 ,??
25. ???????????????? 0x37 ,? 0x36 ,? 0x35 ,? 0x34 ,? 0x33 ,? 0x32 ,? 0x31 ?};??
26. ????????String?content?= "TEST1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ" ;??
27. ????????System.out.println( "Original?content:" );??
28. ????????System.out.println(content);??
29. ???????? try ?{??
30. ????????????BufferedBlockCipher?engine?=? new ?PaddedBufferedBlockCipher( new ?CBCBlockCipher( new ?AESFastEngine()));??
31. ????????????engine.init( true ,? new ?ParametersWithIV( new ?KeyParameter(keybytes),iv));??
32. ???????????? byte []?enc?=? new ? byte [engine.getOutputSize(content.getBytes().length)];??
33. ???????????? int ?size1?=?engine.processBytes(content.getBytes(),? 0 ,?content.getBytes().length,?enc,? 0 );??
34. ???????????? int ?size2?=?engine.doFinal(enc,?size1);??
35. ????????????System.out.println( "size2?=" +size2);??
36. ???????????? byte []?encryptedContent?= new ? byte [size1+size2];??
37. ????????????System.arraycopy(enc,? 0 ,?encryptedContent,? 0 ,?encryptedContent.length);??
38. ????????????System.out.println( "Encrypted?Content:" );??
39. ????????????System.out.println( new ?String(Hex.encode(encryptedContent)));??
40. ??????????????
41. ??????????????
42. ????????????engine.init( false ,? new ?ParametersWithIV( new ?KeyParameter(keybytes),iv));??
43. ???????????? byte []?dec?=? new ? byte [engine.getOutputSize(encryptedContent.length)];??
44. ????????????size1?=?engine.processBytes(encryptedContent,? 0 ,?encryptedContent.length,?dec,? 0 );??
45. ????????????size2?=?engine.doFinal(dec,?size1);??
46. ????????????System.out.println( "size2?=" +size2);??
47. ???????????? byte []?decryptedContent?= new ? byte [size1+size2];??
48. ????????????System.arraycopy(dec,? 0 ,?decryptedContent,? 0 ,?decryptedContent.length);??
49. ????????????System.out.println( "Decrypted?Content:" );??
50. ????????????System.out.println( new ?String(decryptedContent));??
51. ??
52. ????????}? catch ?(Exception?ex)?{??
53. ????????????ex.printStackTrace();??
54. ????????}??
55. ??
56. ????}??
57. ??
58. }?
    

用Bouncy Castle實現AES-128-CBC加密解密