c# asp.net 字符串加密解密的类

1. using System;   
2. using System.Data;   
3. using System.Configuration;   
4. using System.Web;   
5. using System.Web.Security;   
6. using System.Web.UI;   
7. using System.Web.UI.WebControls;   
8. using System.Web.UI.WebControls.WebParts;   
9. using System.Web.UI.HtmlControls;   
10. using System.Security.Cryptography;   
11. using System.IO;   
12.   
13. /// <summary>   
14. /// 密码控制   
15. /// </summary>   
16. public class Class_Password   
17. {   
18.     const string KEY_64 = "VavicApp";//注意了，是8个字符，64位   
19.   
20.     const string IV_64 = "VavicApp";   
21.   
22.     public Class_Password()   
23.     {   
24.         //   
25.         // TODO: 在此处添加构造函数逻辑   
26.         //   
27.     }  
28.  
29.     #region EnCode 加密   
30.     /// <summary>   
31.     /// EnCode 加密   
32.     /// </summary>   
33.     /// <param name="str">要加密的字符串</param>   
34.     /// <returns></returns>   
35.        
36.     public string EnCode(string data)   
37.     {   
38.         byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);   
39.         byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);   
40.   
41.         DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();   
42.         int i = cryptoProvider.KeySize;   
43.         MemoryStream ms = new MemoryStream();   
44.         CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey,   
45.   
46. byIV), CryptoStreamMode.Write);   
47.   
48.         StreamWriter sw = new StreamWriter(cst);   
49.         sw.Write(data);   
50.         sw.Flush();   
51.         cst.FlushFinalBlock();   
52.         sw.Flush();   
53.         return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);   
54.     }  
55.     #endregion  
56.  
57.     #region DeCode 解密   
58.     /// <summary>   
59.     /// DeCode 解密   
60.     /// </summary>   
61.     /// <param name="str">要解密的字符串</param>   
62.     /// <returns></returns>   
63.     public string DeCode(string data)   
64.     {   
65.         byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);   
66.         byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);   
67.   
68.         byte[] byEnc;   
69.         try  
70.         {   
71.             byEnc = Convert.FromBase64String(data);   
72.         }   
73.         catch  
74.         {   
75.             return null;   
76.         }   
77.   
78.         DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();   
79.         MemoryStream ms = new MemoryStream(byEnc);   
80.         CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey,   
81.   
82. byIV), CryptoStreamMode.Read);   
83.         StreamReader sr = new StreamReader(cst);   
84.         return sr.ReadToEnd();   
85.     }  
86.     #endregion   
87.   
88. }  

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Security.Cryptography;
using System.IO;

/// <summary>
/// 密码控制
/// </summary>
public class Class_Password
{
    const string KEY_64 = "VavicApp";//注意了，是8个字符，64位

    const string IV_64 = "VavicApp";

    public Class_Password()
	{
		//
		// TODO: 在此处添加构造函数逻辑
		//
    }

    #region EnCode 加密
    /// <summary>
    /// EnCode 加密
    /// </summary>
    /// <param name="str">要加密的字符串</param>
    /// <returns></returns>
    
    public string EnCode(string data)
    {
        byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
        byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

        DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
        int i = cryptoProvider.KeySize;
        MemoryStream ms = new MemoryStream();
        CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey,

byIV), CryptoStreamMode.Write);

        StreamWriter sw = new StreamWriter(cst);
        sw.Write(data);
        sw.Flush();
        cst.FlushFinalBlock();
        sw.Flush();
        return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
    }
    #endregion

    #region DeCode 解密
    /// <summary>
    /// DeCode 解密
    /// </summary>
    /// <param name="str">要解密的字符串</param>
    /// <returns></returns>
    public string DeCode(string data)
    {
        byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
        byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

        byte[] byEnc;
        try
        {
            byEnc = Convert.FromBase64String(data);
        }
        catch
        {
            return null;
        }

        DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
        MemoryStream ms = new MemoryStream(byEnc);
        CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey,

byIV), CryptoStreamMode.Read);
        StreamReader sr = new StreamReader(cst);
        return sr.ReadToEnd();
    }
    #endregion

}

C#代码

1. using System;   
2. using System.Collections.Generic;   
3. using System.Text;   
4. using System.Security.Cryptography;//Cryptography密码术   
5. namespace DAL   
6. {   
7.     public class Encry   
8.     {   
9.         public Encry() { }  
10.  
11.         #region AES加密   
12.   
13.         public static string Encrypt(string toEncrypt)   
14.         {   
15.             byte[] keyArray = UTF8Encoding.UTF8.GetBytes("12345678901234567890123456789012");   
16.             byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);   
17.   
18.             RijndaelManaged rDel = new RijndaelManaged();//using System.Security.Cryptography;   
19.             rDel.Key = keyArray;   
20.             rDel.Mode = CipherMode.ECB;//using System.Security.Cryptography;   
21.             rDel.Padding = PaddingMode.PKCS7;//using System.Security.Cryptography;   
22.   
23.             ICryptoTransform cTransform = rDel.CreateEncryptor();//using System.Security.Cryptography;   
24.             byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);   
25.   
26.             return Convert.ToBase64String(resultArray, 0, resultArray.Length);   
27.         }  
28.  
29.  
30.  
31.         #endregion AES加密  
32.  
33.  
34.         #region AES解密   
35.   
36.         public static string Decrypt(string toDecrypt)   
37.         {   
38.             byte[] keyArray = UTF8Encoding.UTF8.GetBytes("12345678901234567890123456789012");   
39.             byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);   
40.   
41.             RijndaelManaged rDel = new RijndaelManaged();   
42.             rDel.Key = keyArray;   
43.             rDel.Mode = CipherMode.ECB;   
44.             rDel.Padding = PaddingMode.PKCS7;   
45.   
46.             ICryptoTransform cTransform = rDel.CreateDecryptor();   
47.             byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);   
48.   
49.             return UTF8Encoding.UTF8.GetString(resultArray);   
50.         }  
51.  
52.  
53.  
54.         #endregion AES解密   
55.     }   
56. }