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加密，使用密码产生加密算法的公钥，并使用TripleDES对密码进行加密。解密，使用密码产生加密算法的公钥，并使用TripleDES对加密数据进行解密。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;
namespace WindowsFormsApplication1
{
#region TripleDES算法

public class ClassTripleDES
{
public ClassTripleDES()
{
}

//加密，使用密码产生加密算法的公钥，并使用TripleDES对密码进行加密。
public static string Encrypt(string pass)
{
try
{
byte[] bt = (new System.Text.UnicodeEncoding()).GetBytes(pass);
PasswordDeriveBytes pdb = new PasswordDeriveBytes(pass, null);
byte[] key = pdb.GetBytes(24);
byte[] iv = pdb.GetBytes(8);
MemoryStream ms = new MemoryStream();
TripleDESCryptoServiceProvider tdesc = new TripleDESCryptoServiceProvider();
CryptoStream cs = new CryptoStream(ms, tdesc.CreateEncryptor(key, iv), CryptoStreamMode.Write);
cs.Write(bt, 0, bt.Length);
cs.FlushFinalBlock();
return Convert.ToBase64String(ms.ToArray());
}
catch (Exception ex)
{
throw ex;
}
}

//解密，使用密码产生加密算法的公钥，并使用TripleDES对加密数据进行解密。
public static string Decrypt(string str, string pass)
{
try
{
byte[] bt = Convert.FromBase64String(str);
PasswordDeriveBytes pdb = new PasswordDeriveBytes(pass, null);
byte[] key = pdb.GetBytes(24);
byte[] iv = pdb.GetBytes(8);
MemoryStream ms = new MemoryStream();
TripleDESCryptoServiceProvider tdesc = new TripleDESCryptoServiceProvider();
CryptoStream cs = new CryptoStream(ms, tdesc.CreateDecryptor(key, iv), CryptoStreamMode.Write);
cs.Write(bt, 0, bt.Length);
cs.FlushFinalBlock();
return (new System.Text.UnicodeEncoding()).GetString(ms.ToArray());
}
catch (Exception ex)
{
throw ex;
}
}
//使用：
//string str = Encrypt("bbb");
//Console.WriteLine(Decrypt(str, "bbb"));

//加密，使用密码产生加密算法的公钥，并使用TripleDES对密码进行加密。
public static string EncryptWithKey(string pass, string p_key)
{
try
{
byte[] bt = (new System.Text.UnicodeEncoding()).GetBytes(pass);
PasswordDeriveBytes pdb = new PasswordDeriveBytes(p_key, null);
byte[] key = pdb.GetBytes(24);
byte[] iv = pdb.GetBytes(8);
MemoryStream ms = new MemoryStream();
TripleDESCryptoServiceProvider tdesc = new TripleDESCryptoServiceProvider();
CryptoStream cs = new CryptoStream(ms, tdesc.CreateEncryptor(key, iv), CryptoStreamMode.Write);
cs.Write(bt, 0, bt.Length);
cs.FlushFinalBlock();
return Convert.ToBase64String(ms.ToArray());
}
catch (Exception ex)
{
throw ex;
}
}

//解密，使用密码产生加密算法的公钥，并使用TripleDES对加密数据进行解密。
public static string DecryptWithKey(string str, string p_key)
{
try
{
byte[] bt = Convert.FromBase64String(str);
PasswordDeriveBytes pdb = new PasswordDeriveBytes(p_key, null);
byte[] key = pdb.GetBytes(24);
byte[] iv = pdb.GetBytes(8);
MemoryStream ms = new MemoryStream();
TripleDESCryptoServiceProvider tdesc = new TripleDESCryptoServiceProvider();
CryptoStream cs = new CryptoStream(ms, tdesc.CreateDecryptor(key, iv), CryptoStreamMode.Write);
cs.Write(bt, 0, bt.Length);
cs.FlushFinalBlock();
return (new System.Text.UnicodeEncoding()).GetString(ms.ToArray());
}
catch (Exception ex)
{
throw ex;
}
}

}

#endregion
}

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