1 package my3des;

2

3 import java.io.UnsupportedEncodingException;

4

5 import javax.crypto.Cipher;

6 import javax.crypto.SecretKey;

7 import javax.crypto.spec.SecretKeySpec;

8

9

10 /**

11 * SecretUtils {3DES加密解密的工具类 }

12 * @author William

13 * @date 2013-04-19

14 */

15 public class SecretUtils {

16

17 //定义加密算法，有DES、DESede(即3DES)、Blowfish

18 private static final String Algorithm = "DESede";

19 private static final String PASSWORD_CRYPT_KEY = "2012PinganVitality075522628888ForShenZhenBelter075561869839";

20

21

22 /**

23 * 加密方法

24 * @param src 源数据的字节数组

25 * @return

26 */

27 public static byte[] encryptMode(byte[] src) {

28 try {

29 SecretKey deskey = new SecretKeySpec(build3DesKey(PASSWORD_CRYPT_KEY), Algorithm); //生成密钥

30 Cipher c1 = Cipher.getInstance(Algorithm); //实例化负责加密/解密的Cipher工具类

31 c1.init(Cipher.ENCRYPT_MODE, deskey); //初始化为加密模式

32 return c1.doFinal(src);

33 } catch (java.security.NoSuchAlgorithmException e1) {

34 e1.printStackTrace();

35 } catch (javax.crypto.NoSuchPaddingException e2) {

36 e2.printStackTrace();

37 } catch (java.lang.Exception e3) {

38 e3.printStackTrace();

39 }

40 return null;

41 }

42

43

44 /**

45 * 解密函数

46 * @param src 密文的字节数组

47 * @return

48 */

49 public static byte[] decryptMode(byte[] src) {

50 try {

51 SecretKey deskey = new SecretKeySpec(build3DesKey(PASSWORD_CRYPT_KEY), Algorithm);

52 Cipher c1 = Cipher.getInstance(Algorithm);

53 c1.init(Cipher.DECRYPT_MODE, deskey); //初始化为解密模式

54 return c1.doFinal(src);

55 } catch (java.security.NoSuchAlgorithmException e1) {

56 e1.printStackTrace();

57 } catch (javax.crypto.NoSuchPaddingException e2) {

58 e2.printStackTrace();

59 } catch (java.lang.Exception e3) {

60 e3.printStackTrace();

61 }

62 return null;

63 }

64

65

66 /*

67 * 根据字符串生成密钥字节数组

68 * @param keyStr 密钥字符串

69 * @return

70 * @throws UnsupportedEncodingException

71 */

72 public static byte[] build3DesKey(String keyStr) throws UnsupportedEncodingException{

73 byte[] key = new byte[24]; //声明一个24位的字节数组，默认里面都是0

74 byte[] temp = keyStr.getBytes("UTF-8"); //将字符串转成字节数组

75

76 /*

77 * 执行数组拷贝

78 * System.arraycopy(源数组，从源数组哪里开始拷贝，目标数组，拷贝多少位)

79 */

80 if(key.length > temp.length){

81 //如果temp不够24位，则拷贝temp数组整个长度的内容到key数组中

82 System.arraycopy(temp, 0, key, 0, temp.length);

83 }else{

84 //如果temp大于24位，则拷贝temp数组24个长度的内容到key数组中

85 System.arraycopy(temp, 0, key, 0, key.length);

86 }

87 return key;

88 }

89 }