/// <summary>
/// 加密字符串
/// </summary>
public string En(string str)
{
int i = 0;
StringBuilder sb = new StringBuilder(); //return Encrypt3DES(str,"3DESDocManageSystem"); foreach(char A in str)
{
switch(i % 6)
{
case 0:
sb.Append((char)(A - 8));
break;
case 1:
sb.Append((char)(A - 3));
break;
case 2:
sb.Append((char)(A - 1));
break;
case 3:
sb.Append((char)(A - 4));
break;
case 4:
sb.Append((char)(A - 9));
break;
case 5:
sb.Append((char)(A - 6));
break;
}
i++;
}
string temp = Reverse(sb.ToString());
return temp;
} /// <summary>
/// 解密字符串
/// </summary>
public string De(string str)
{
int i = 0;
StringBuilder sb = new StringBuilder(); foreach(char A in Reverse(str))
{
switch(i % 6)
{
case 0:
sb.Append((char)(A + 8));
break;
case 1:
sb.Append((char)(A + 3));
break;
case 2:
sb.Append((char)(A + 1));
break;
case 3:
sb.Append((char)(A + 4));
break;
case 4:
sb.Append((char)(A + 9));
break;
case 5:
sb.Append((char)(A + 6));
break;
}
i++;
}
string temp = sb.ToString();
return temp;
} /// <summary>
/// 反转字符串
/// </summary>
/// <param name="str">要反转的字符串</param>
/// <returns>string</returns>
public string Reverse(string str)
{
StringBuilder sb = new StringBuilder();
for(int i=str.Length-1;i>=0;i--)
{
sb.Append(str[i]);
}
return sb.ToString();
}
这个只能加英文字母,有汉字怎么办??帮我改一下,谢谢了!!
/// 加密字符串
/// </summary>
public string En(string str)
{
int i = 0;
StringBuilder sb = new StringBuilder(); //return Encrypt3DES(str,"3DESDocManageSystem"); foreach(char A in str)
{
switch(i % 6)
{
case 0:
sb.Append((char)(A - 8));
break;
case 1:
sb.Append((char)(A - 3));
break;
case 2:
sb.Append((char)(A - 1));
break;
case 3:
sb.Append((char)(A - 4));
break;
case 4:
sb.Append((char)(A - 9));
break;
case 5:
sb.Append((char)(A - 6));
break;
}
i++;
}
string temp = Reverse(sb.ToString());
return temp;
} /// <summary>
/// 解密字符串
/// </summary>
public string De(string str)
{
int i = 0;
StringBuilder sb = new StringBuilder(); foreach(char A in Reverse(str))
{
switch(i % 6)
{
case 0:
sb.Append((char)(A + 8));
break;
case 1:
sb.Append((char)(A + 3));
break;
case 2:
sb.Append((char)(A + 1));
break;
case 3:
sb.Append((char)(A + 4));
break;
case 4:
sb.Append((char)(A + 9));
break;
case 5:
sb.Append((char)(A + 6));
break;
}
i++;
}
string temp = sb.ToString();
return temp;
} /// <summary>
/// 反转字符串
/// </summary>
/// <param name="str">要反转的字符串</param>
/// <returns>string</returns>
public string Reverse(string str)
{
StringBuilder sb = new StringBuilder();
for(int i=str.Length-1;i>=0;i--)
{
sb.Append(str[i]);
}
return sb.ToString();
}
这个只能加英文字母,有汉字怎么办??帮我改一下,谢谢了!!
* Copyright(C) 2004-2005 ******** All Rights Reserved.
************************************************************************/using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
using System.Web;
using System.Windows.Forms;
/// <summary>
/// Triple Data Encryption Standard algorithms implementations
/// </summary>
/// <Author>Yao</Author>
/// <Date>2005/4/20</Date>public class CryptionData
{
// The length of Encryptionstring should be 8 byte and not be a weak key
private string EncryptionString;// The length of initialization vector should be 8 byte
private static Byte[] EncryptionIV = Encoding.Default.GetBytes("abcdefgh");/// <summary>
/// Constructor
/// </summary>
public CryptionData()
{
}/// <summary>
/// Constructor
/// </summary>
/// <param name="EncryptionString">SecureKey</param>
public CryptionData(string EncryptionString)
{
this.EncryptionString = EncryptionString;
}/// <summary>
/// Encryption method for byte array
/// </summary>
/// <param name="SourceData">source data</param>
/// <returns>byte array</returns>
public byte[] EncryptionByteData(byte[] SourceData)
{
byte[] returnData = null;
try
{
// Create DESCryptoServiceProvider object
DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();// Set SecureKey and IV of desProvider
byte[] byteKey = Encoding.Default.GetBytes(EncryptionString);
desProvider.Key = byteKey;
desProvider.IV = EncryptionIV;// A MemoryStream object
MemoryStream ms = new MemoryStream();// Create Encryptor
ICryptoTransform encrypto = desProvider.CreateEncryptor();// Create CryptoStream object
CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);// Encrypt SourceData
cs.Write(SourceData,0,SourceData.Length);
cs.FlushFinalBlock();// Get Encryption result
returnData = ms.ToArray();
}
catch(Exception ex)
{
throw ex;
}return returnData;}/// <summary>
/// Decryption method for byte array
/// </summary>
/// <param name="SourceData">source data</param>
/// <returns>byte array</returns>
public byte[] DecryptionByteData(byte[] SourceData)
{
byte[] returnData = null;
try
{
// Create DESCryptoServiceProvider object
DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();// Set SecureKey and IV of desProvider
byte[] byteKey = Encoding.Default.GetBytes(EncryptionString);
desProvider.Key = byteKey;
desProvider.IV = EncryptionIV;// A MemoryStream object
MemoryStream ms = new MemoryStream();// Create Decryptor
ICryptoTransform encrypto = desProvider.CreateDecryptor();// Create CryptoStream object
CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);// Decrypt SourceData
cs.Write(SourceData, 0, SourceData.Length);
cs.FlushFinalBlock();// Get Decryption result
returnData = ms.ToArray();
}
catch(Exception ex)
{
throw ex;
}
return returnData;}/// <summary>
/// Encryption method for string
/// </summary>
/// <param name="SourceData">source data</param>
/// <returns>string</returns>
public string EncryptionStringData(string SourceData)
{
try
{
// Convert source data from string to byte array
byte[] SourData = Encoding.Default.GetBytes(SourceData);// Encrypt byte array
byte[] retData = EncryptionByteData(SourData);// Convert encryption result from byte array to Base64String
return Convert.ToBase64String(retData, 0, retData.Length);
}
catch(Exception ex)
{
throw ex;
}
}/// <summary>
/// Decryption method for string
/// </summary>
/// <param name="SourceData">source data</param>
/// <returns>string</returns>
public string DecryptionStringdata(string SourceData)
{
try
{
// Convert source data from Base64String to byte array
byte[] SourData = Convert.FromBase64String(SourceData);// Decrypt byte array
byte[] retData = DecryptionByteData(SourData);// Convert Decryption result from byte array to string
return Encoding.Default.GetString(retData, 0, retData.Length);
}
catch(Exception ex)
{
throw ex;
}
}
}我写的这个类,加密字符串和字节数组的。
这是最初开发的一个类,加密字节数组这个方法是用来加密小的图像文件的。把图像读到字节数组中,就可以解密解密了。后来改造过一次,加密字符串用的是TripleDES,加密图像,因为速度的关系采用DES算法的。