using system;
using system.io;
using system.text;
using system.security.cryptography;
namespace elight.infrastructure
descryptoserviceprovider des = new descryptoserviceprovider();
byte inputbytearray = encoding.getencoding("utf-8").getbytes(text);
byte a = asciiencoding.ascii.getbytes(key);
des.key = asciiencoding.ascii.getbytes(key);
des.iv = asciiencoding.ascii.getbytes(key);
memorystream ms = new memorystream();
cryptostream cs = new cryptostream(ms, des.createencryptor(), cryptostreammode.write);
cs.write(inputbytearray, 0, inputbytearray.length);
cs.flushfinalblock();
///
/// des解密，使用自定義金鑰。
///
/// 待解密的秘文
/// 必須是8位字元的金鑰字串(不能有特殊字元)
///
public static string desdecrypt(this string cyphertext, string key)
if (string.isnullorempty(cyphertext))
return string.empty;
descryptoserviceprovider des = new descryptoserviceprovider();
byte inputbytearray = new byte[cyphertext.length / 2];
for (int x = 0; x < cyphertext.length / 2; x++)
des.key = asciiencoding.ascii.getbytes(key);
des.iv = asciiencoding.ascii.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 system.text.encoding.getencoding("utf-8").getstring(ms.toarray());
}///
/// des加密，使用預設金鑰。
///
/// 待加密的明文
///
public static string desencrypt(this string text)
///
/// des解密，使用預設金鑰。
///
/// 待解密的秘文
///
public static string desdecrypt(this string cyphertext)
#endregion
#region base64加密解密
///
/// base64加密，採用指定字元編碼方式加密。
///
/// 待加密的明文
/// 字元編碼
///
public static string base64encrypt(this string input, encoding encode)
///
/// base64加密，採用utf8編碼方式加密。
///
/// 待加密的明文
///
public static string base64encrypt(this string input)
///
/// base64解密，採用utf8編碼方式解密。
///
/// 待解密的秘文
///
public static string base64decrypt(this string input)
///
/// base64解密，採用指定字元編碼方式解密。
///
/// 待解密的秘文
/// 字元的編碼
///
public static string base64decrypt(this string input, encoding encode)
#endregion
#region md5加密
///
/// 字串md5加密。
///
/// 需要加密的字串
///
///
/// 檔案流md5加密。
///
/// 需要加密的檔案流
///
DES加密解密
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