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DES(Data Encryption Standard)数据加密标准

DES算法入口参数

DES算法的入口参数有三个:Key、Data、Mode。其中Key为7个字节共56位，是DES算法的工作密钥。Data为8个字节64位，是要被加密或解密的数据;Mode为DES的工作方法,有两种:加密或解密。

加密解密文件

 1         /// <summary>
 2         /// Enctypt File
 3         /// </summary>
 4         /// <param name="sInputFilename"></param>
 5         /// <param name="sOutputFilename"></param>
 6         /// <param name="sKey"></param>
 7         public void EncryptFile(string sInputFilename, string sOutputFilename, string sKey)
 8         {
 9             DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
10             //A 64 bit key and IV is required for this provider.
11             //Set secret key For DES algorithm.
12             DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
13             //Set initialization vector.
14             DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
15 
16             FileStream fin = null;
17             FileStream fout = null;
18             CryptoStream cryptoStream = null;
19             try
20             {
21                 fin = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);
22                 fout = new FileStream(sOutputFilename, FileMode.OpenOrCreate, FileAccess.Write);
23                 cryptoStream = new CryptoStream(fout, DES.CreateEncryptor(), CryptoStreamMode.Write);
24 
25                 byte[] bin = new byte[100];  //This is intermediate storage for the decryption.
26                 long rdlen = 0;              //This is the total number of bytes written.
27                 long totlen = fin.Length;    //This is the total length of the input file.
28                 int len;                     //This is the number of bytes to be written at a time.
29 
30                 //Read from the input file, then encrypt and write to the output file.
31                 while (rdlen < totlen)
32                 {
33                     len = fin.Read(bin, 0, 100);
34                     cryptoStream.Write(bin, 0, len);
35                     rdlen = rdlen + len;
36                 }
37             }
38             catch (Exception ex)
39             {
40                 throw ex;
41             }
42             finally
43             {
44                 if (cryptoStream != null) { cryptoStream.Close(); }
45                 if (fout != null) { fout.Close(); }
46                 if (fin != null) { fin.Close(); }
47             }
48         }
49 
50         /// <summary>
51         /// Decrypt File
52         /// </summary>
53         /// <param name="sInputFilename"></param>
54         /// <param name="sOutputFilename"></param>
55         /// <param name="sKey"></param>
56         public void DecryptFile(string sInputFilename, string sOutputFilename,string sKey)
57         {
58             DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
59             //A 64 bit key and IV is required for this provider.
60             //Set secret key For DES algorithm.
61             DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
62             //Set initialization vector.
63             DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
64 
65             FileStream fin = null;
66             FileStream fout = null;
67             CryptoStream cryptoStream = null;
68             try
69             {
70                 fin = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);
71                 fout = new FileStream(sOutputFilename, FileMode.OpenOrCreate, FileAccess.Write);
72                 cryptoStream = new CryptoStream(fin, DES.CreateDecryptor(), CryptoStreamMode.Read);
73               
74                 byte[] bin = new byte[100];  //This is intermediate storage for the decryption.
75                 long rdlen = 0;              //This is the total number of bytes written.
76                 long totlen = fin.Length;    //This is the total length of the input file.
77                 int len;                     //This is the number of bytes to be written at a time.
78 
79                 //Read from the input file, then encrypt and write to the output file.
80                 while (rdlen < totlen)
81                 {
82                     len = cryptoStream.Read(bin, 0, 100);
83                     if (len == 0) { break; }
84                     fout.Write(bin, 0, len);
85                     rdlen = rdlen + len;
86                 }
87             }
88             catch(Exception ex)
89             {
90                 throw ex;
91             }
92             finally
93             {
94                 if (cryptoStream != null) { cryptoStream.Close(); }
95                 if (fout != null) { fout.Close(); }
96                 if (fin != null) { fin.Close(); }
97             }
98         }

View Code

加密解密文本

 1         /// <summary>
 2         /// Encrypt Text
 3         /// </summary>
 4         public string DesEncrypt(string pToEncrypt, string sKey)
 5         {
 6             MemoryStream ms = null;
 7             CryptoStream ctyptoStream = null;
 8             try
 9             {
10                 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
11                 des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
12                 des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
13 
14                 byte[] inputByteArray = Encoding.ASCII.GetBytes(pToEncrypt);
15               
16                 ms = new System.IO.MemoryStream();
17                 ctyptoStream = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
18                 ctyptoStream.Write(inputByteArray, 0, inputByteArray.Length);
19                 ctyptoStream.FlushFinalBlock();
20             }
21             catch (Exception ex)
22             {
23                 throw ex;
24             }
25             finally
26             {
27                 if (ctyptoStream != null) { ctyptoStream.Close(); }
28                 if (ms != null) { ms.Close(); }
29             }
30             return Convert.ToBase64String(ms.ToArray());
31         }
32 
33         /// <summary>
34         /// Dectypt Text
35         /// </summary>
36         public string DesDecrypt(string pToDecrypt, string sKey)
37         {
38             MemoryStream ms = null;
39             CryptoStream ctyptoStream = null;
40             try
41             {
42                 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
43                 des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
44                 des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
45 
46                 byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
47 
48                 ms = new System.IO.MemoryStream();
49                 ctyptoStream = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
50                 ctyptoStream.Write(inputByteArray, 0, inputByteArray.Length);
51                 ctyptoStream.FlushFinalBlock();
52             }
53             catch (Exception ex)
54             {
55                 throw ex;
56             }
57             finally
58             {
59                 if (ctyptoStream != null) { ctyptoStream.Close(); }
60                 if (ms != null) { ms.Close(); }
61             }
62             return Encoding.ASCII.GetString(ms.ToArray());
63         }

View Code

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原文地址：https://www.cnblogs.com/JustYong/p/4087372.html