java

/**

* 解密DES

* @param key 密钥，长度必须是8的倍数

* @param data 数据源

* @return 解密内容

*/

public final static String decoderDES(String key,String data) throws Exception{

// DES算法要求有一个可信任的随机数源

SecureRandom sr = new SecureRandom();

// 从原始密匙数据创建一个DESKeySpec对象

DESKeySpec dks = new DESKeySpec(key.getBytes("utf-8"));

// 创建一个密匙工厂，然后用它把DESKeySpec对象转换成一个SecretKey对象

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

SecretKey securekey = keyFactory.generateSecret(dks);

// Cipher对象实际完成解密操作

Cipher cipher = Cipher.getInstance("DES");

// 用密匙初始化Cipher对象

cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

// 正式执行解密操作

return new String(cipher.doFinal(hexStr2ByteArr(data)));

}

/**

* 加密DES

* @param key 加密key

* @param data 加密内容

* @return 加密串

*/

public final static String encodeDES(String key,String data) throws Exception{

// DES算法要求有一个可信任的随机数源

SecureRandom sr = new SecureRandom();

// 从原始密匙数据创建DESKeySpec对象

DESKeySpec dks = new DESKeySpec(key.getBytes("utf-8"));

// 创建一个密匙工厂，然后用它把DESKeySpec转换成一个SecretKey对象

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

SecretKey securekey = keyFactory.generateSecret(dks);

// Cipher对象实际完成加密操作

Cipher cipher = Cipher.getInstance("DES");

// 用密匙初始化Cipher对象

cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);

// 执行加密操作

byte[] buf = cipher.doFinal(data.getBytes("utf-8"));

return byteArr2HexStr(buf);

}

Net

public static string DES(string str)

{

DESCryptoServiceProvider des = new DESCryptoServiceProvider();

byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(str);

//建立加密对象的密钥和偏移量

//原文使用ASCIIEncoding.ASCII方法的GetBytes方法

//使得输入密码必须输入英文文本

des.Mode = CipherMode.ECB;

des.Key = ASCIIEncoding.UTF8.GetBytes(key);

des.IV = ASCIIEncoding.UTF8.GetBytes(key);

MemoryStream ms = new MemoryStream();

CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

cs.Write(inputByteArray, 0, inputByteArray.Length);

cs.FlushFinalBlock();

StringBuilder ret = new StringBuilder();

foreach (byte b in ms.ToArray())

{

ret.AppendFormat("{0:X2}", b);

}

ret.ToString();

return ret.ToString().ToLower();

}

public static string DESDeCode(string pToDecrypt)

{

// HttpContext.Current.Response.Write(pToDecrypt + "
" + sKey);

// HttpContext.Current.Response.End();

DESCryptoServiceProvider des = new DESCryptoServiceProvider();

byte[] inputByteArray = new byte[pToDecrypt.Length / 2];

for (int x = 0; x < pToDecrypt.Length / 2; x++)

{

int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));

inputByteArray[x] = (byte)i;

}

//des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

// des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

des.Mode = CipherMode.ECB;

des.Key = ASCIIEncoding.UTF8.GetBytes(key);

des.IV = ASCIIEncoding.UTF8.GetBytes(key);

MemoryStream ms = new MemoryStream();

CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);

cs.Write(inputByteArray, 0, inputByteArray.Length);

cs.FlushFinalBlock();

StringBuilder ret = new StringBuilder();

// return HttpContext.Current.Server.UrlDecode(System.Text.Encoding.Default.GetString(ms.ToArray()));

return System.Text.Encoding.UTF8.GetString(ms.ToArray());

}

原文：http://www.cnblogs.com/Guroer/p/6107596.html