//名称空间
using System;
using System.Security.Cryptography;
using System.IO;
using System.Text; 
//方法
//加密方法
public string Encrypt(string pToEncrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
//把字符串放到byte数组中
//原来使用的UTF8编码,我改成Unicode编码了,不行
byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
//byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt); 
//建立加密对象的密钥和偏移量
//原文使用ASCIIEncoding.ASCII方法的GetBytes方法
//使得输入密码必须输入英文文本
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(),CryptoStreamMode.Write);
//Write the byte array into the crypto stream
//(It will end up in the memory stream)
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
//Get the data back from the memory stream, and into a string
StringBuilder ret = new StringBuilder();
foreach(byte b in ms.ToArray())
{
//Format as hex
ret.AppendFormat("{0:X2}", b);
}
ret.ToString();
return ret.ToString();
} 
//解密方法
public string Decrypt(string pToDecrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 
//Put the input string into the byte array
byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
for(int x = 0; x < pToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
} 
//建立加密对象的密钥和偏移量,此值重要,不能修改
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(),CryptoStreamMode.Write);
//Flush the data through the crypto stream into the memory stream
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock(); 
//Get the decrypted data back from the memory stream
//建立StringBuild对象,CreateDecrypt使用的是流对象,必须把解密后的文本变成流对象
StringBuilder ret = new StringBuilder();
return System.Text.Encoding.Default.GetString(ms.ToArray());
} 
来源:http://blog.csdn.net/keyu23/archive/2005/09/27/490577.aspx
using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
using System.Web;
namespace Test.Com
{
/// <summary>
/// DESEncryptor 的摘要说明。
/// </summary>
public class DESEncryptor
{
私有成员
公共属性
构造函数
DES加密字符串
DES解密字符串
DES加密文件
DES解密文件
MD5 



}
} 

来源: http://www.3s8.cn/develop/c1/200611/324.html
1
using System;
2
using System.Security;
3
using System.Security.Cryptography;
4
using System.Diagnostics;
5
using System.Web;
6
using System.Text;
7
using System.ComponentModel;
8
using System.Collections;
9
10
namespace NSE.Data
11
{
12
public class Encryption
13
{
14
/// <summary>
15
/// 转换string到Byte树组
16
/// </summary>
17
/// <param name="s">要转换的字符串</param>
18
/// <returns>转换的Byte数组</returns>
19
public Byte[] StringToByteArray(String s)
20
{
21
/*
22
Char[] ca = s.ToCharArray();
23
Byte[] ba = new Byte[ca.Length];
24
for(int i=0; i<ba.Length; i++) ba[i] = (Byte)ca[i];
25
return ba;*/
26
27
return Encoding.UTF8.GetBytes(s);
28
}
29
30
/// <summary>
31
/// 转换Byte数组到字符串
32
/// </summary>
33
/// <param name="a_arrByte">Byte数组</param>
34
/// <returns>字符串</returns>
35
public string ByteArrayToString(Byte[] a_arrByte)
36
{
37
/*
38
//char[] ca = new char[a_arrByte.Length] ;
39
for(int i = 0 ; i < a_arrByte.Length ; i ++)
40
{
41
result += (char)a_arrByte[i] ;
42
}*/
43
44
return Encoding.UTF8.GetString(a_arrByte);
45
}
46
47
48
/// <summary>
49
/// 3des加密字符串
50
/// </summary>
51
/// <param name="a_strString">要加密的字符串</param>
52
/// <param name="a_strKey">密钥</param>
53
/// <returns>加密后并经base64编码的字符串</returns>
54
/// <remarks>静态方法,采用默认ascii编码</remarks>
55
public string Encrypt3DES(string a_strString, string a_strKey)
56
{
57
TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
58
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();
59
60
DES.Key = hashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(a_strKey));
61
DES.Mode = CipherMode.ECB;
62
63
ICryptoTransform DESEncrypt = DES.CreateEncryptor();
64
65
byte[] Buffer = ASCIIEncoding.ASCII.GetBytes(a_strString);
66
return Convert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));
67
}//end method
68
69
/// <summary>
70
/// 3des加密字符串
71
/// </summary>
72
/// <param name="a_strString">要加密的字符串</param>
73
/// <param name="a_strKey">密钥</param>
74
/// <param name="encoding">编码方式</param>
75
/// <returns>加密后并经base63编码的字符串</returns>
76
/// <remarks>重载,指定编码方式</remarks>
77
public string Encrypt3DES(string a_strString, string a_strKey, Encoding encoding)
78
{
79
TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
80
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();
81
82
DES.Key = hashMD5.ComputeHash(encoding.GetBytes(a_strKey));
83
DES.Mode = CipherMode.ECB;
84
85
ICryptoTransform DESEncrypt = DES.CreateEncryptor();
86
87
88
byte[] Buffer = encoding.GetBytes(a_strString);
89
return Convert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));
90
}
91
92
93
/// <summary>
94
/// 3des解密字符串
95
/// </summary>
96
/// <param name="a_strString">要解密的字符串</param>
97
/// <param name="a_strKey">密钥</param>
98
/// <returns>解密后的字符串</returns>
99
/// <exception cref="">密钥错误</exception>
100
/// <remarks>静态方法,采用默认ascii编码</remarks>
101
public string Decrypt3DES(string a_strString, string a_strKey)
102
{
103
TripleDESCryptoServiceProvider DES = new
104
TripleDESCryptoServiceProvider();
105
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();
106
107
DES.Key = hashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(a_strKey));
108
DES.Mode = CipherMode.ECB;
109
110
ICryptoTransform DESDecrypt = DES.CreateDecryptor();
111
112
string result = "";
113
try
114
{
115
byte[] Buffer = Convert.FromBase64String(a_strString);
116
result = ASCIIEncoding.ASCII.GetString(DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));
117
}
118
catch (Exception e)
119
{
120
//#if DEBUG
121
Console.WriteLine("错误:{0}", e);
122
//#endif//DEBUG
123
throw (new Exception("Invalid Key or input string is not a valid base64 string", e));
124
}
125
126
return result;
127
}//end method
128
129
/// <summary>
130
/// 3des解密字符串
131
/// </summary>
132
/// <param name="a_strString">要解密的字符串</param>
133
/// <param name="a_strKey">密钥</param>
134
/// <param name="encoding">编码方式</param>
135
/// <returns>解密后的字符串</returns>
136
/// <exception cref="">密钥错误</exception>
137
/// <remarks>静态方法,指定编码方式</remarks>
138
public string Decrypt3DES(string a_strString, string a_strKey, Encoding encoding)
139
{
140
TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
141
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();
142
143
DES.Key = hashMD5.ComputeHash(encoding.GetBytes(a_strKey));
144
DES.Mode = CipherMode.ECB;
145
146
ICryptoTransform DESDecrypt = DES.CreateDecryptor();
147
148
string result = "";
149
try
150
{
151
byte[] Buffer = Convert.FromBase64String(a_strString);
152
result = encoding.GetString(DESDecrypt.TransformFinalBlock
153
(Buffer, 0, Buffer.Length));
154
}
155
catch (Exception e)
156
{
157
//#if DEBUG
158
Console.WriteLine("错误:{0}", e);
159
//#endif//DEBUG
160
throw (new Exception("Invalid Key or input string is not a valid base64 string", e));
161
}
162
163
return result;
164
}//end method
165
166
}
167
}
168
using System;2
using System.Security;3
using System.Security.Cryptography;4
using System.Diagnostics;5
using System.Web;6
using System.Text;7
using System.ComponentModel;8
using System.Collections;9

10
namespace NSE.Data11
{12
public class Encryption13
{14
/// <summary> 15
/// 转换string到Byte树组 16
/// </summary> 17
/// <param name="s">要转换的字符串</param> 18
/// <returns>转换的Byte数组</returns> 19
public Byte[] StringToByteArray(String s)20
{21
/* 22
Char[] ca = s.ToCharArray(); 23
Byte[] ba = new Byte[ca.Length]; 24
for(int i=0; i<ba.Length; i++) ba[i] = (Byte)ca[i]; 25
return ba;*/26

27
return Encoding.UTF8.GetBytes(s);28
}29

30
/// <summary> 31
/// 转换Byte数组到字符串 32
/// </summary> 33
/// <param name="a_arrByte">Byte数组</param> 34
/// <returns>字符串</returns> 35
public string ByteArrayToString(Byte[] a_arrByte)36
{37
/* 38
//char[] ca = new char[a_arrByte.Length] ; 39
for(int i = 0 ; i < a_arrByte.Length ; i ++) 40
{ 41
result += (char)a_arrByte[i] ; 42
}*/43

44
return Encoding.UTF8.GetString(a_arrByte);45
}46

47

48
/// <summary> 49
/// 3des加密字符串 50
/// </summary> 51
/// <param name="a_strString">要加密的字符串</param> 52
/// <param name="a_strKey">密钥</param> 53
/// <returns>加密后并经base64编码的字符串</returns> 54
/// <remarks>静态方法,采用默认ascii编码</remarks> 55
public string Encrypt3DES(string a_strString, string a_strKey)56
{57
TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();58
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();59

60
DES.Key = hashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(a_strKey));61
DES.Mode = CipherMode.ECB;62

63
ICryptoTransform DESEncrypt = DES.CreateEncryptor();64

65
byte[] Buffer = ASCIIEncoding.ASCII.GetBytes(a_strString);66
return Convert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));67
}//end method 68

69
/// <summary> 70
/// 3des加密字符串 71
/// </summary> 72
/// <param name="a_strString">要加密的字符串</param> 73
/// <param name="a_strKey">密钥</param> 74
/// <param name="encoding">编码方式</param> 75
/// <returns>加密后并经base63编码的字符串</returns> 76
/// <remarks>重载,指定编码方式</remarks> 77
public string Encrypt3DES(string a_strString, string a_strKey, Encoding encoding)78
{79
TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();80
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();81

82
DES.Key = hashMD5.ComputeHash(encoding.GetBytes(a_strKey));83
DES.Mode = CipherMode.ECB;84

85
ICryptoTransform DESEncrypt = DES.CreateEncryptor();86

87

88
byte[] Buffer = encoding.GetBytes(a_strString);89
return Convert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));90
}91

92

93
/// <summary> 94
/// 3des解密字符串 95
/// </summary> 96
/// <param name="a_strString">要解密的字符串</param> 97
/// <param name="a_strKey">密钥</param> 98
/// <returns>解密后的字符串</returns> 99
/// <exception cref="">密钥错误</exception> 100
/// <remarks>静态方法,采用默认ascii编码</remarks> 101
public string Decrypt3DES(string a_strString, string a_strKey)102
{103
TripleDESCryptoServiceProvider DES = new104
TripleDESCryptoServiceProvider();105
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();106

107
DES.Key = hashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(a_strKey));108
DES.Mode = CipherMode.ECB;109

110
ICryptoTransform DESDecrypt = DES.CreateDecryptor();111

112
string result = "";113
try114
{115
byte[] Buffer = Convert.FromBase64String(a_strString);116
result = ASCIIEncoding.ASCII.GetString(DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));117
}118
catch (Exception e)119
{120
//#if DEBUG121
Console.WriteLine("错误:{0}", e);122
//#endif//DEBUG123
throw (new Exception("Invalid Key or input string is not a valid base64 string", e));124
}125

126
return result;127
}//end method 128

129
/// <summary> 130
/// 3des解密字符串 131
/// </summary> 132
/// <param name="a_strString">要解密的字符串</param> 133
/// <param name="a_strKey">密钥</param> 134
/// <param name="encoding">编码方式</param> 135
/// <returns>解密后的字符串</returns> 136
/// <exception cref="">密钥错误</exception> 137
/// <remarks>静态方法,指定编码方式</remarks> 138
public string Decrypt3DES(string a_strString, string a_strKey, Encoding encoding)139
{140
TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();141
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();142

143
DES.Key = hashMD5.ComputeHash(encoding.GetBytes(a_strKey));144
DES.Mode = CipherMode.ECB;145

146
ICryptoTransform DESDecrypt = DES.CreateDecryptor();147

148
string result = "";149
try150
{151
byte[] Buffer = Convert.FromBase64String(a_strString);152
result = encoding.GetString(DESDecrypt.TransformFinalBlock153
(Buffer, 0, Buffer.Length));154
}155
catch (Exception e)156
{157
//#if DEBUG158
Console.WriteLine("错误:{0}", e);159
//#endif//DEBUG160
throw (new Exception("Invalid Key or input string is not a valid base64 string", e));161
}162

163
return result;164
}//end method 165

166
}167
}168




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