java加密解密技术(3)对称加密AES

 

1. import javax.crypto.Cipher;

2. import javax.crypto.spec.IvParameterSpec;

3. import javax.crypto.spec.SecretKeySpec;

4.  

5. import sun.misc.BASE64Decoder;

6. import sun.misc.BASE64Encoder;

7.  

8. public class AESCoder{

9.  

10. public static String encrypt(String strKey, String strIn) throws Exception {

11. SecretKeySpec skeySpec = getKey(strKey);

12. Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

13. IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());

14. cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);

15. byte[] encrypted = cipher.doFinal(strIn.getBytes());

16.  

17. return new BASE64Encoder().encode(encrypted);

18. }

19.  

20. public static String decrypt(String strKey, String strIn) throws Exception {

21. SecretKeySpec skeySpec = getKey(strKey);

22. Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

23. IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());

24. cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);

25. byte[] encrypted1 = new BASE64Decoder().decodeBuffer(strIn);

26.  

27. byte[] original = cipher.doFinal(encrypted1);

28. String originalString = new String(original);

29. return originalString;

30. }

31.  

32. private static SecretKeySpec getKey(String strKey) throws Exception {

33. byte[] arrBTmp = strKey.getBytes();

34. byte[] arrB = new byte[16]; // 创建一个空的16位字节数组（默认值为0）

35. for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {

36. arrB[i] = arrBTmp[i];

37. }

38. SecretKeySpec skeySpec = new SecretKeySpec(arrB, "AES");

39.  

40. return skeySpec;

41. }

42.  

43. public static void main(String[] args) throws Exception {

44. String Code = "中文ABc123";

45. String key = "1q2w3e4r";

46. String codE;

47. codE = AESCoder.encrypt(key, Code);

48. System.out.println("原文：" + Code);

49. System.out.println("密钥：" + key);

50. System.out.println("密文：" + codE);

51. System.out.println("解密：" + AESCoder.decrypt(key, codE));

52. }

53. }

转自 http://www.cnblogs.com/freeliver54/archive/2011/10/09/2203342.html