Android DES加密的CBC模式加密解密和ECB模式加密解密

DES加密共有四种模式：电子密码本模式（ECB）、加密分组链接模式（CBC）、加密反馈模式（CFB）和输出反馈模式（OFB）。

CBC模式加密：

1. import java.security.Key;
2. import java.security.spec.AlgorithmParameterSpec;
3. import javax.crypto.Cipher;
4. import javax.crypto.SecretKeyFactory;
5. import javax.crypto.spec.DESKeySpec;
6. import javax.crypto.spec.IvParameterSpec;
7. import com.sun.org.apache.xml.internal.security.utils.Base64;
8. public class DesCbcUtil {
9. public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";
10. /**
11. * 加密
12. * @param data 待加密字符串
13. * @param key 加密私钥，长度不能够小于8位
14. * @return 加密后的字节数组，一般结合Base64编码使用
15. * @throws CryptException 异常
16. */
17. public static String encode(String key, String data) throws Exception {
18. return encode(key, data.getBytes());
19. }
20. /**
21. * 加密
22. * @param data 待加密字符串
23. * @param key 加密私钥，长度不能够小于8位
24. * @return 加密后的字节数组，一般结合Base64编码使用
25. * @throws CryptException 异常
26. */
27. public static String encode(String key, byte[] data) throws Exception {
28. try {
29. byte[] ivbyte = { 1, 2, 3, 4, 5, 6, 7, 8 };
30. DESKeySpec dks = new DESKeySpec(key.getBytes());
31. SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
32. // key的长度不能够小于8位字节
33. Key secretKey = keyFactory.generateSecret(dks);
34. Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
35. IvParameterSpec iv = new IvParameterSpec(ivbyte);
36. AlgorithmParameterSpec paramSpec = iv;
37. cipher.init(Cipher.ENCRYPT_MODE, secretKey, paramSpec);
38. byte[] bytes = cipher.doFinal(data);
39. return Base64.encode(bytes);
40. } catch (Exception e) {
41. throw new Exception(e);
42. }
43. }
44. /**
45. * 解密
46. * @param data 待解密字符串
47. * @param key 解密私钥，长度不能够小于8位
48. * @return 解密后的字节数组
49. * @throws Exception 异常
50. */
51. public static byte[] decode(String key, byte[] data) throws Exception {
52. try {
53. DESKeySpec dks = new DESKeySpec(key.getBytes());
54. SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
55. // key的长度不能够小于8位字节
56. Key secretKey = keyFactory.generateSecret(dks);
57. Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
58. IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
59. AlgorithmParameterSpec paramSpec = iv;
60. cipher.init(Cipher.DECRYPT_MODE, secretKey, paramSpec);
61. return cipher.doFinal(data);
62. } catch (Exception e) {
63. throw new Exception(e);
64. }
65. }
66. /**
67. * 获取编码后的值
68. *
69. * @param key
70. * @param data
71. * @return
72. * @throws Exception
73. */
74. public static String decodeValue(String key, String data) {
75. byte[] datas;
76. String value = null;
77. try {
78. if (System.getProperty("os.name") != null
79. && (System.getProperty("os.name").equalsIgnoreCase("sunos") || System
80. .getProperty("os.name").equalsIgnoreCase("linux"))) {
81. datas = decode(key, Base64.decode(data));
82. } else {
83. datas = decode(key, Base64.decode(data));
84. }
85. value = new String(datas);
86. } catch (Exception e) {
87. value = "";
88. }
89. return value;
90. }
91. }

ECB模式加密：

1. import javax.crypto.Cipher;
2. import javax.crypto.SecretKeyFactory;
3. import javax.crypto.spec.DESKeySpec;
4. import android.util.Base64;
5. public class DesEcbUtil {
6. public static final String ALGORITHM_DES = "DES/ECB/PKCS5Padding";
7. /**
8. * 加密
9. * @param data 待加密字符串
10. * @param key 加密私钥，长度不能够小于8位
11. * @return 加密后的字节数组，一般结合Base64编码使用
12. * @throws CryptException  异常
13. */
14. public static String encode(String key, String data) throws Exception {
15. return encode(key, data.getBytes());
16. }
17. /**
18. * 加密
19. * @param data 待加密字符串
20. * @param key 加密私钥，长度不能够小于8位
21. * @return 加密后的字节数组，一般结合Base64编码使用
22. * @throws CryptException 异常
23. */
24. public static String encode(String key, byte[] data) throws Exception {
25. try {
26. DESKeySpec dks = new DESKeySpec(key.getBytes());
27. SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
28. // key的长度不能够小于8位字节
29. Key secretKey = keyFactory.generateSecret(dks);
30. Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
31. cipher.init(Cipher.ENCRYPT_MODE, secretKey);
32. byte[] bytes = cipher.doFinal(data);
33. return Base64.encodeToString(bytes, 3);
34. } catch (Exception e) {
35. throw new Exception(e);
36. }
37. }
38. /**
39. * 解密
40. * @param data 待解密字符串
41. * @param key 解密私钥，长度不能够小于8位
42. * @return 解密后的字节数组
43. * @throws Exception 异常
44. */
45. public static byte[] decode(String key, byte[] data) throws Exception {
46. try {
47. DESKeySpec dks = new DESKeySpec(key.getBytes());
48. SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
49. // key的长度不能够小于8位字节
50. Key secretKey = keyFactory.generateSecret(dks);
51. Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
52. cipher.init(Cipher.DECRYPT_MODE, secretKey);
53. return cipher.doFinal(data);
54. } catch (Exception e) {
55. throw new Exception(e);
56. }
57. }
58. /**
59. * 获取编码后的值
60. *
61. * @param key
62. * @param data
63. * @return
64. * @throws Exception
65. */
66. public static String decodeValue(String key, String data) {
67. byte[] datas;
68. String value = null;
69. try {
70. if (System.getProperty("os.name") != null
71. && (System.getProperty("os.name").equalsIgnoreCase("sunos") || System
72. .getProperty("os.name").equalsIgnoreCase("linux"))) {
73. datas = decode(key, Base64.decode(data, 3));
74. } else {
75. datas = decode(key, Base64.decode(data, 3));
76. }
77. value = new String(datas);
78. } catch (Exception e) {
79. value = "";
80. }
81. return value;
82. }
83. }

测试（CBC模式的测试和ECB的一样）：

try {


//待加密内容url


String str = "";

String pwdKey = "moshapp"; 


String pwdKeyMD5 = MD5Util.encode(pwdKey);


System.out.println("pwdKeyMD5：" + pwdKeyMD5);


String encodeStr = DesEcbUtil.encode(pwdKeyMD5, str);


String decodeStr = DesEcbUtil.decodeValue(pwdKeyMD5, encodeStr);


System.out.println("加密前的字符串：" + str);


System.out.println("加密后的字符串：" + encodeStr);


System.out.println("解密后的字符串：" + decodeStr);


// URL转义


final String encodedURL = URLEncoder.encode(encodeStr, "UTF-8");

//
URL urlStr = new URL(encodedURL);


System.out.println("转义后的字符串：" + encodedURL);


} catch (Exception e) {


e.printStackTrace();


}

参考：

http://blog.csdn.net/randyjiawenjie/article/details/6617225

Android平台和java平台 DES加密解密互通程序及其不能互通的原因

http://hi.baidu.com/hpyfei/item/ca990cff5ce7b217ff358263

Android与PHP互通的DES加密解密

http://www.linuxidc.com/Linux/2011-08/41866.htm

Android客户端与服务器端通过DES加密认证