1 using System;
2 using System.Security.Cryptography;
3 using System.Text;
4 using System.IO;
5
6 namespace AES
7 {
8 public class AESEncryption
9 {
10 private static string strKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
11 /// <summary>
12 /// AES加密算法
13 /// </summary>
14 /// <param name="plainText">明文字符串</param>
15 /// <param name="strKey">密钥</param>
16 /// <returns>返回加密后的密文字节数组</returns>
17 public static string AESEncrypt(string plainText)
18 {
19 try
20 {
21 //分组加密算法
22 RijndaelManaged aes = new RijndaelManaged();
23 byte[] inputByteArray = Encoding.UTF8.GetBytes(plainText);//得到需要加密的字节数组
24
25 //设置密钥及密钥向量
26 aes.Key = Encoding.UTF8.GetBytes(GetMD5(strKey));
27 aes.IV = Encoding.UTF8.GetBytes(GetMD5(strKey).Substring(8, 16));
28 aes.Mode = CipherMode.CBC;
29 aes.Padding = PaddingMode.PKCS7;
30
31 ICryptoTransform transform = aes.CreateEncryptor();
32 byte[] buffer= transform.TransformFinalBlock(inputByteArray, 0, inputByteArray.Length);
33
34 //System.IO.MemoryStream ms = new System.IO.MemoryStream();
35
36 //CryptoStream cs = new CryptoStream(ms, aes.CreateEncryptor(), CryptoStreamMode.Write);
37
38 //cs.Write(inputByteArray, 0, inputByteArray.Length);
39 //cs.FlushFinalBlock();
40
41 StringBuilder ret = new StringBuilder();
42 foreach (byte b in buffer)
43 {
44 ret.AppendFormat("{0:x2}", b);
45 }
46 return ret.ToString();
47 }
48 catch
49 {
50 return plainText;
51 }
52 }
53
54 /// <summary>
55 /// AES解密
56 /// </summary>
57 /// <param name="cipherText">密文字节数组</param>
58 /// <param name="strKey">密钥</param>
59 /// <returns>返回解密后的字符串</returns>
60 public static string AESDecrypt(string cipherText)
61 {
62 try
63 {
64 RijndaelManaged aes = new RijndaelManaged();
65
66 int len;
67 len = cipherText.Length / 2;
68 byte[] inputByteArray = new byte[len];
69 int x, i;
70 for (x = 0; x < len; x++)
71 {
72 i = Convert.ToInt32(cipherText.Substring(x * 2, 2), 16);
73 inputByteArray[x] = (byte)i;
74 }
75
76 //byte[] inputByteArray = Encoding.UTF8.GetBytes(cipherText);
77 //设置密钥及密钥向量
78 aes.Key = Encoding.UTF8.GetBytes(GetMD5(strKey));
79 aes.IV = Encoding.UTF8.GetBytes(GetMD5(strKey).Substring(8, 16));
80 aes.Mode = CipherMode.CBC;
81 aes.Padding = PaddingMode.PKCS7;
82
83 ICryptoTransform transform = aes.CreateDecryptor();
84 byte[] buffer = transform.TransformFinalBlock(inputByteArray, 0, inputByteArray.Length);
85
86 //System.IO.MemoryStream ms = new System.IO.MemoryStream();
87 //CryptoStream cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Write);
88 //cs.Write(inputByteArray, 0, inputByteArray.Length);
89 //cs.FlushFinalBlock();
90 string strDecrypt = Encoding.UTF8.GetString(buffer);
91 return strDecrypt;
92
93 }
94 catch
95 {
96 return cipherText;
97 }
98 }
99
100 public static string GetMD5(string str)
101 {
102 StringBuilder sb = new StringBuilder();
103 foreach (byte b in System.Security.Cryptography.MD5.Create().ComputeHash(Encoding.UTF8.GetBytes(str)))
104 {
105 sb.Append(b.ToString("X2"));
106 }
107 return sb.ToString();
108 }
109
110
111 }
112 }
