信息计算2019级1班18号冯雨

冯雨

1. import javax.crypto.Cipher;
   
2. import javax.crypto.spec.IvParameterSpec;
   
3. 
   
4. import javax.crypto.spec.SecretKeySpec;
   
5. 
   
6. import java.util.Base64.Encoder;
   
7. import java.io.File;
   
8. import java.io.FileInputStream;
   
9. import java.io.FileOutputStream;
   
10. import java.io.InputStream;
    
11. import java.io.OutputStream;
    
12. import java.net.URLDecoder;
    
13. import java.util.Base64;
    
14. import java.util.Base64.Decoder;
    
15. 
    
16. 
    
17. /**AES 是一种可逆加密算法，对用户的敏感信息加密处理
    
18. 
    
19. * 对原始数据进行AES加密后，在进行Base64编码转化；
    
20. 
    
21. */
    
22. 
    
23. public class mima {
    
24. 
    
25. private static final int PKCS5Padding = 0;
    
26. private static int data=0;
    
27. 
    
28. /*
    
29. 
    
30. * 加密用的Key 可以用26个字母和数字组成
    
31. 
    
32. * 此处使用AES-128-CBC加密模式，key需要为16位。
    
33. 
    
34. */
    
35. 
    
36. private String sKey="0123456789abcdef";
    
37. 
    
38. private String ivParameter="0123456789abcdef";
    
39. 
    
40. private static mima instance=null;
    
41. 
    
42. private mima(){
    
43. 
    
44. }
    
45. 
    
46. public static mima getInstance(){
    
47. 
    
48. if (instance==null)
    
49. 
    
50. instance= new mima();
    
51. 
    
52. return instance;
    
53. 
    
54. }
    
55. 
    
56. // 加密
    
57. 
    
58. public String encrypt(String sSrc) throws Exception {
    
59. 
    
60. Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    
61. 
    
62. byte[] raw = sKey.getBytes();
    
63. 
    
64. SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
    
65. 
    
66. IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());//使用CBC模式，需要一个向量iv，可增加加密算法的强度
    
67. 
    
68. cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
    
69. 
    
70. int utf;
    
71. byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
    
72. 
    
73. Encoder encoder=Base64.getEncoder();
    
74. return  encoder.encodeToString(encrypted);//此处使用Base64做转码。
    
75. 
    
76. }
    
77. 
    
78. // 解密
    
79. 
    
80. public String decrypt(String sSrc) throws Exception {
    
81. 
    
82. try {
    
83. 
    
84. byte[] raw = sKey.getBytes("ASCII");
    
85. 
    
86. SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
    
87. 
    
88. Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    
89. 
    
90. IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
    
91. 
    
92. cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
    
93. Decoder decoder=Base64.getDecoder();
    
94. 
    
95. byte[] encrypted1 = decoder.decode(sSrc);//先用base64解密
    
96. 
    
97. byte[] original = cipher.doFinal(encrypted1);
    
98. 
    
99. String originalString = new String(original,"utf-8");
    
100. 
     
101. return originalString;
     
102. 
     
103. } catch (Exception ex) {
     
104. 
     
105. return null;
     
106. 
     
107. }
     
108. 
     
109. }
     
110. 
     
111. public static void main(String[] args) throws Exception {
     
112. 
     
113. 
     
114. String cSrc = "我是学生";
     
115. // 加密
     
116. 
     
117. 
     
118. String enString = mima.getInstance().encrypt(cSrc);
     
119. System.out.println("加密后的字串是：" + enString);
     
120. 
     
121. String DeString = mima.getInstance().decrypt(enString);
     
122. 
     
123. 
     
124. System.out.println("解密后的字串是：" + DeString);
     
125. 
     
126. }
     
127. 
     
128. }
     

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