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 SymmetricAlgorithm mCSP;

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 SymmetricAlgorithm SetEnc()

...{

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>

/// <param name="Value"></param>

/// <returns></returns>

public string EncryptString(string Value)

...{

ICryptoTransform ct;

MemoryStream ms;

CryptoStream cs;

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>

/// <param name="Value"></param>

/// <returns></returns>

public string DecryptString(string Value)

...{

ICryptoTransform ct;

MemoryStream ms;

CryptoStream cs;

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

}

}

 

 

 

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