字符串加密解密类[封装][C#][asp.net]

这个字符串加密解密类是广大程序员必不可少的[静态类]

 

 1 using  System;
 2 using  System.Text;
 3 using  System.Security.Cryptography;
 4 using  System.IO;
 5
 6  
 7
 8 // 默认密钥向量
 9 private   static   byte [] Keys  =   { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF } ;
10 /**/ /**/ /**/ /// <summary>
11/// DES加密字符串
12/// </summary>
13/// <param name="encryptString">待加密的字符串</param>
14/// <param name="encryptKey">加密密钥,要求为8位</param>
15/// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
16 public   static   string  EncryptDES( string  encryptString,  string  encryptKey)
17 {
18    try
19    {
20        byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
21        byte[] rgbIV = Keys;
22        byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
23        DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
24        MemoryStream mStream = new MemoryStream();
25        CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
26        cStream.Write(inputByteArray, 0, inputByteArray.Length);
27        cStream.FlushFinalBlock();
28        return Convert.ToBase64String(mStream.ToArray());
29    }
30    catch
31    {
32        return encryptString;
33    }
34}
35
36 /**/ /**/ /**/ /// <summary>
37/// DES解密字符串
38/// </summary>
39/// <param name="decryptString">待解密的字符串</param>
40/// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
41/// <returns>解密成功返回解密后的字符串，失败返源串</returns>
42 public   static   string  DecryptDES( string  decryptString,  string  decryptKey)
43 {
44    try
45    {
46        byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
47        byte[] rgbIV = Keys;
48        byte[] inputByteArray = Convert.FromBase64String(decryptString);
49        DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
50        MemoryStream mStream = new MemoryStream();
51        CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
52        cStream.Write(inputByteArray, 0, inputByteArray.Length);
53        cStream.FlushFinalBlock();
54        return Encoding.UTF8.GetString(mStream.ToArray());
55    }
56    catch
57    {
58        return decryptString;
59    }
60}
61