javades.net,.net的des加密方法,怎么用java实现.多谢分不够再加~

C# code///

/// 使用指定的加密算法、用随机密钥加密字符串

///

/// 要加密的字符串

/// 加密结果

public string Encrypting(string Source,string Key)

{

#region temp

string strTemp &＃61; Key;

if(strTemp.Length * 8 > objCryptoService.LegalKeySizes[0].MaxSize)

{

// 如果密钥长度太长得话&＃xff0c;截

strTemp &＃61; strTemp.Substring(0,objCryptoService.LegalKeySizes[0].MaxSize / 8);

}

if(strTemp.Length * 8

{

// 如果密钥长度太短得的话&＃xff0c;在右边补空格

strTemp &＃61; strTemp.PadRight(objCryptoService.LegalKeySizes[0].MinSize / 8);

}

if(objCryptoService.LegalKeySizes[0].SkipSize !&＃61; 0 && (strTemp.Length * 8) % objCryptoService.LegalKeySizes[0].SkipSize !&＃61; 0)

{

// 如果密钥长度不是密钥长度间隔单位的倍数&＃xff0c;则补空格。

strTemp &＃61; strTemp.PadRight(objCryptoService.LegalKeySizes[0].MaxSize / 8);

}

byte[] _Key &＃61; System.Text.Encoding.Default.GetBytes(strTemp);

objCryptoService.Key &＃61; _Key;

objCryptoService.IV &＃61; _Key;

#endregion

// 创建内存中的数据流

System.IO.MemoryStream objMemoryStream &＃61; new System.IO.MemoryStream();

// 创建加密器

ICryptoTransform objEncryptor &＃61; objCryptoService.CreateEncryptor();

// 创建加密转换文件流的加密流

CryptoStream objCryptoStream &＃61; new CryptoStream(objMemoryStream, objEncryptor, CryptoStreamMode.Write);

StreamWriter writer &＃61; new StreamWriter(objCryptoStream);

writer.Write(Source);

writer.Flush();

objCryptoStream.FlushFinalBlock();

// 获取输出

byte[] bytOut &＃61; new byte[objMemoryStream.Length];

objMemoryStream.Position &＃61; 0;

objMemoryStream.Read(bytOut,0,bytOut.Length);

string strDest &＃61; System.Convert.ToBase64String(bytOut);

objCryptoService.Clear();

objMemoryStream.Close();

writer.Close();

return strDest;

}