Android DES加密的CBC和ECB加密解密模式

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. public static String encode(String key, String data) throws Exception {
    
11. return encode(key, data.getBytes());
    
12. }
    
13. public static String encode(String key, byte[] data) throws Exception {
    
14. try {
    
15. byte[] ivbyte = { 1, 2, 3, 4, 5, 6, 7, 8 };
    
16. DESKeySpec dks = new DESKeySpec(key.getBytes());
    
17. SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    
18. // key的长度不能够小于8位字节
    
19. Key secretKey = keyFactory.generateSecret(dks);
    
20. Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
    
21. IvParameterSpec iv = new IvParameterSpec(ivbyte);
    
22. AlgorithmParameterSpec paramSpec = iv;
    
23. cipher.init(Cipher.ENCRYPT_MODE, secretKey, paramSpec);
    
24. byte[] bytes = cipher.doFinal(data);
    
25. return Base64.encode(bytes);
    
26. } catch (Exception e) {
    
27. throw new Exception(e);
    
28. }
    
29. }
    
30. public static byte[] decode(String key, byte[] data) throws Exception {
    
31. try {
    
32. DESKeySpec dks = new DESKeySpec(key.getBytes());
    
33. SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    
34. // key的长度不能够小于8位字节
    
35. Key secretKey = keyFactory.generateSecret(dks);
    
36. Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
    
37. IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
    
38. AlgorithmParameterSpec paramSpec = iv;
    
39. cipher.init(Cipher.DECRYPT_MODE, secretKey, paramSpec);
    
40. return cipher.doFinal(data);
    
41. } catch (Exception e) {
    
42. throw new Exception(e);
    
43. }
    
44. }
    
45. public static String decodeValue(String key, String data) {
    
46. byte[] datas;
    
47. String value = null;
    
48. try {
    
49. if (System.getProperty("os.name") != null
    
50. && (System.getProperty("os.name").equalsIgnoreCase("sunos") || System
    
51. .getProperty("os.name").equalsIgnoreCase("linux"))) {
    
52. datas = decode(key, Base64.decode(data));
    
53. } else {
    
54. datas = decode(key, Base64.decode(data));
    
55. }
    
56. value = new String(datas);
    
57. } catch (Exception e) {
    
58. value = "";
    
59. }
    
60. return value;
    
61. }
    
62. }

复制代码

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. public static String encode(String key, String data) throws Exception {
   
8. return encode(key, data.getBytes());
   
9. }
   
10. public static String encode(String key, byte[] data) throws Exception {
    
11. try {
    
12. DESKeySpec dks = new DESKeySpec(key.getBytes());
    
13. SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    
14. // key的长度不能够小于8位字节
    
15. Key secretKey = keyFactory.generateSecret(dks);
    
16. Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
    
17. cipher.init(Cipher.ENCRYPT_MODE, secretKey);
    
18. byte[] bytes = cipher.doFinal(data);
    
19. return Base64.encodeToString(bytes, 3);
    
20. } catch (Exception e) {
    
21. throw new Exception(e);
    
22. }
    
23. }
    
24. public static byte[] decode(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.DECRYPT_MODE, secretKey);
    
32. return cipher.doFinal(data);
    
33. } catch (Exception e) {
    
34. throw new Exception(e);
    
35. }
    
36. }
    
37. public static String decodeValue(String key, String data) {
    
38. byte[] datas;
    
39. String value = null;
    
40. try {
    
41. if (System.getProperty("os.name") != null
    
42. && (System.getProperty("os.name").equalsIgnoreCase("sunos") || System
    
43. .getProperty("os.name").equalsIgnoreCase("linux"))) {
    
44. datas = decode(key, Base64.decode(data, 3));
    
45. } else {
    
46. datas = decode(key, Base64.decode(data, 3));
    
47. }
    
48. value = new String(datas);
    
49. } catch (Exception e) {
    
50. value = "";
    
51. }
    
52. return value;
    
53. }
    
54. }
    
55. 测试（CBC模式的测试和ECB的一样）：
    
56. try {
    
57. //待加密内容url
    
58. String str = "";
    
59. String pwdKey = "moshapp";
    
60. String pwdKeyMD5 = MD5Util.encode(pwdKey);
    
61. System.out.println("pwdKeyMD5：" + pwdKeyMD5);
    
62. String encodeStr = DesEcbUtil.encode(pwdKeyMD5, str);
    
63. String decodeStr = DesEcbUtil.decodeValue(pwdKeyMD5, encodeStr);
    
64. System.out.println("加密前的字符串：" + str);
    
65. System.out.println("加密后的字符串：" + encodeStr);
    
66. System.out.println("解密后的字符串：" + decodeStr);
    
67. // URL转义
    
68. final String encodedURL = URLEncoder.encode(encodeStr, "UTF-8");
    
69. // URL urlStr = new URL(encodedURL);
    
70. System.out.println("转义后的字符串：" + encodedURL);
    
71. } catch (Exception e) {
    
72. e.printStackTrace();
    
73. }