一个可逆的DES和TripleDES方式加密类（downmoon原创)

一个可逆的DES和TripleDES方式加密类（downmoon原创)

using System;
using System.Security;
using System.Security.Cryptography;
using System.IO;
using System.Text;
namespace EncryptDownmoon
... {
/**/ /// <summary>
/// EncryptSqlConn的摘要说明。
/// </summary>
public class EncryptSqlConn
... {
public EncryptSqlConn()
... {
if (mCSP == null )
... {
mCSP = SetEnc();
}
}
/**/ /// <summary>
/// 设置加密方式，0为DES，1为TripleDES
/// </summary>
/// <returns></returns>
public EncryptSqlConn( int EnMethod)
... {
if (EnMethod == 0 )
... {
lngEnMethod = 0 ;
}
else
... {
lngEnMethod = 1 ;
}
if (mCSP == null )
... {
mCSP = SetEnc();
}

}
方法 #region 方法

private SymmetricAlgorithmmCSP;
private int m_lngEnMethod = 0 ;
/**/ /// <summary>
/// 加密方式，0为DES，1为TripleDES
/// </summary>
public int lngEnMethod
... {
get
... {
return m_lngEnMethod;
}
set
... {
m_lngEnMethod = value;
}
}
private SymmetricAlgorithmSetEnc()
... {
if (lngEnMethod == 0 )
... {
return new DESCryptoServiceProvider();
}
else
return new TripleDESCryptoServiceProvider();
}
// 测试键值
private string genKeyValue
... {
get
... {
mCSP.GenerateKey();
return Convert.ToBase64String(mCSP.Key);
}
}
// 测试IV值
private string genIVValue
... {
get
... {
mCSP.GenerateIV();
return Convert.ToBase64String(mCSP.IV);
}
}
/**/ /// <summary>
/// 加密字串
/// </summary>
/// <paramname="Value"></param>
/// <returns></returns>
public string EncryptString( string Value)
... {
ICryptoTransformct;
MemoryStreamms;
CryptoStreamcs;
byte []byt;
ct = mCSP.CreateEncryptor(mCSP.Key,mCSP.IV);
// ct=mCSP.CreateEncryptor(genKeyValue,genIVValue);
byt = Encoding.UTF8.GetBytes(Value);
ms = new MemoryStream();
cs = new CryptoStream(ms,ct,CryptoStreamMode.Write);
cs.Write(byt, 0 ,byt.Length);
cs.FlushFinalBlock();
cs.Close();
return Convert.ToBase64String(ms.ToArray());
}

/**/ /// <summary>
/// 解密字串
/// </summary>
/// <paramname="Value"></param>
/// <returns></returns>
public string DecryptString( string Value)
... {
ICryptoTransformct;
MemoryStreamms;
CryptoStreamcs;
byte []byt;
ct = mCSP.CreateDecryptor(mCSP.Key,mCSP.IV);
// ct=mCSP.CreateDecryptor(genKeyValue,genIVValue);
byt = Convert.FromBase64String(Value);
ms = new MemoryStream();
cs = new CryptoStream(ms,ct,CryptoStreamMode.Write);
cs.Write(byt, 0 ,byt.Length);
cs.FlushFinalBlock();
cs.Close();
return Encoding.UTF8.GetString(ms.ToArray());
}
#endregion

}
}