1 第一种：
2 using System;
3 using System.Text;
4 using System.Security.Cryptography;
5 using System.IO;
6
7 /// <summary>
8 /// Summary description for EncryptAndDecrypt
9 /// </summary>
10 public class EncryptAndDecrypt
11 {
12 //默认密钥向量
13 private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
14 /**//// <summary>
15 /// DES加密字符串
16 /// </summary>
17 /// <param name="encryptString">待加密的字符串</param>
18 /// <param name="encryptKey">加密密钥,要求为8位</param>
19 /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
20 public static string EncryptDES(string encryptString, string encryptKey)
21 {
22 try
23 {
24 byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
25 byte[] rgbIV = Keys;
26 byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
27 DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
28 MemoryStream mStream = new MemoryStream();
29 CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
30 cStream.Write(inputByteArray, 0, inputByteArray.Length);
31 cStream.FlushFinalBlock();
32 return Convert.ToBase64String(mStream.ToArray());
33 }
34 catch
35 {
36 return encryptString;
37 }
38 }
39
40 /**//// <summary>
41 /// DES解密字符串
42 /// </summary>
43 /// <param name="decryptString">待解密的字符串</param>
44 /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
45 /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
46 public static string DecryptDES(string decryptString, string decryptKey)
47 {
48 try
49 {
50 byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
51 byte[] rgbIV = Keys;
52 byte[] inputByteArray = Convert.FromBase64String(decryptString);
53 DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
54 MemoryStream mStream = new MemoryStream();
55 CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
56 cStream.Write(inputByteArray, 0, inputByteArray.Length);
57 cStream.FlushFinalBlock();
58 return Encoding.UTF8.GetString(mStream.ToArray());
59 }
60 catch
61 {
62 return decryptString;
63 }
64 }
65 }
66 第二种：
67
68 //名称空间
69 using System;
70 using System.Security.Cryptography;
71 using System.IO;
72 using System.Text;
73
74 /// <summary>
75 /// Summary description for Encryption
76 /// </summary>
77 public class Encryption
78 {
79 /// <summary>
80 /// Default Key
81 /// </summary>
82 public const string Key = "bmc.1001";
83 /// <summary>
84 /// Initial
85 /// </summary>
86 public Encryption()
87 {
88 ///
89 }
90 /// <summary>
91 /// 加密方法
92 /// </summary>
93 /// <param name="pToEncrypt"></param>
94 /// <param name="sKey"></param>
95 /// <returns></returns>
96 public string Encrypt(string pToEncrypt, string sKey)
97 {
98 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
99 //把字符串放到byte数组中
100 //原来使用的UTF8编码，我改成Unicode编码了，不行
101 byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
102 //byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);
103
104 //建立加密对象的密钥和偏移量
105 //原文使用ASCIIEncoding.ASCII方法的GetBytes方法
106 //使得输入密码必须输入英文文本
107 des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
108 des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
109 //创建其支持存储区为内存的流
110 MemoryStream ms = new MemoryStream();
111 //将数据流链接到加密转换的流
112 CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
113 //Write the byte array into the crypto stream
114 //(It will end up in the memory stream)
115 cs.Write(inputByteArray, 0, inputByteArray.Length);
116 //用缓冲区的当前状态更新基础数据源或储存库，随后清除缓冲区
117 cs.FlushFinalBlock();
118 //Get the data back from the memory stream, and into a string
119 byte[] EncryptData = (byte[])ms.ToArray();
120 return System.Convert.ToBase64String(EncryptData, 0, EncryptData.Length);
121 }
122 /// <summary>
123 /// 解密方法
124 /// </summary>
125 /// <param name="pToDecrypt"></param>
126 /// <param name="sKey"></param>
127 /// <returns></returns>
128 public string Decrypt(string pToDecrypt, string sKey)
129 {
130 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
131 //Put the input string into the byte array
132 byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
133
134 //建立加密对象的密钥和偏移量，此值重要，不能修改
135 des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
136 des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
137 MemoryStream ms = new MemoryStream();
138 CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
139 //Flush the data through the crypto stream into the memory stream
140 cs.Write(inputByteArray, 0, inputByteArray.Length);
141 cs.FlushFinalBlock();
142 return System.Text.Encoding.Default.GetString(ms.ToArray());
143 }
144 }
145
2 using System;
3 using System.Text;
4 using System.Security.Cryptography;
5 using System.IO;
6
7 /// <summary>
8 /// Summary description for EncryptAndDecrypt
9 /// </summary>
10 public class EncryptAndDecrypt
11 {
12 //默认密钥向量
13 private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
14 /**//// <summary>
15 /// DES加密字符串
16 /// </summary>
17 /// <param name="encryptString">待加密的字符串</param>
18 /// <param name="encryptKey">加密密钥,要求为8位</param>
19 /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
20 public static string EncryptDES(string encryptString, string encryptKey)
21 {
22 try
23 {
24 byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
25 byte[] rgbIV = Keys;
26 byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
27 DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
28 MemoryStream mStream = new MemoryStream();
29 CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
30 cStream.Write(inputByteArray, 0, inputByteArray.Length);
31 cStream.FlushFinalBlock();
32 return Convert.ToBase64String(mStream.ToArray());
33 }
34 catch
35 {
36 return encryptString;
37 }
38 }
39
40 /**//// <summary>
41 /// DES解密字符串
42 /// </summary>
43 /// <param name="decryptString">待解密的字符串</param>
44 /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
45 /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
46 public static string DecryptDES(string decryptString, string decryptKey)
47 {
48 try
49 {
50 byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
51 byte[] rgbIV = Keys;
52 byte[] inputByteArray = Convert.FromBase64String(decryptString);
53 DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
54 MemoryStream mStream = new MemoryStream();
55 CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
56 cStream.Write(inputByteArray, 0, inputByteArray.Length);
57 cStream.FlushFinalBlock();
58 return Encoding.UTF8.GetString(mStream.ToArray());
59 }
60 catch
61 {
62 return decryptString;
63 }
64 }
65 }
66 第二种：
67
68 //名称空间
69 using System;
70 using System.Security.Cryptography;
71 using System.IO;
72 using System.Text;
73
74 /// <summary>
75 /// Summary description for Encryption
76 /// </summary>
77 public class Encryption
78 {
79 /// <summary>
80 /// Default Key
81 /// </summary>
82 public const string Key = "bmc.1001";
83 /// <summary>
84 /// Initial
85 /// </summary>
86 public Encryption()
87 {
88 ///
89 }
90 /// <summary>
91 /// 加密方法
92 /// </summary>
93 /// <param name="pToEncrypt"></param>
94 /// <param name="sKey"></param>
95 /// <returns></returns>
96 public string Encrypt(string pToEncrypt, string sKey)
97 {
98 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
99 //把字符串放到byte数组中
100 //原来使用的UTF8编码，我改成Unicode编码了，不行
101 byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
102 //byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);
103
104 //建立加密对象的密钥和偏移量
105 //原文使用ASCIIEncoding.ASCII方法的GetBytes方法
106 //使得输入密码必须输入英文文本
107 des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
108 des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
109 //创建其支持存储区为内存的流
110 MemoryStream ms = new MemoryStream();
111 //将数据流链接到加密转换的流
112 CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
113 //Write the byte array into the crypto stream
114 //(It will end up in the memory stream)
115 cs.Write(inputByteArray, 0, inputByteArray.Length);
116 //用缓冲区的当前状态更新基础数据源或储存库，随后清除缓冲区
117 cs.FlushFinalBlock();
118 //Get the data back from the memory stream, and into a string
119 byte[] EncryptData = (byte[])ms.ToArray();
120 return System.Convert.ToBase64String(EncryptData, 0, EncryptData.Length);
121 }
122 /// <summary>
123 /// 解密方法
124 /// </summary>
125 /// <param name="pToDecrypt"></param>
126 /// <param name="sKey"></param>
127 /// <returns></returns>
128 public string Decrypt(string pToDecrypt, string sKey)
129 {
130 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
131 //Put the input string into the byte array
132 byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
133
134 //建立加密对象的密钥和偏移量，此值重要，不能修改
135 des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
136 des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
137 MemoryStream ms = new MemoryStream();
138 CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
139 //Flush the data through the crypto stream into the memory stream
140 cs.Write(inputByteArray, 0, inputByteArray.Length);
141 cs.FlushFinalBlock();
142 return System.Text.Encoding.Default.GetString(ms.ToArray());
143 }
144 }
145
