DES資料加密 解密

///

/// des資料加密

///

/// 目標值

/// 金鑰

/// 加密值

public static string encrypt(string targetvalue, string key)

///

///

///

public static string decrypt(string targetvalue, string key)

// 定義des加密物件

var des = new descryptoserviceprovider();

int len = targetvalue.length / 2;

var inputbytearray = new byte[len];

int x, i;

for (x = 0; x < len; x++)

// 通過兩次雜湊密碼設定對稱演算法的初始化向量

des.key = encoding.ascii.getbytes(formsauthentication.hashpasswordforstoringinconfigfile

(formsauthentication.hashpasswordforstoringinconfigfile(key, "md5").

substring(0, 8), "sha1").substring(0, 8));

// 通過兩次雜湊密碼設定演算法的機密金鑰

des.iv = encoding.ascii.getbytes(formsauthentication.hashpasswordforstoringinconfigfile

(formsauthentication.hashpasswordforstoringinconfigfile(key, "md5")

.substring(0, 8), "md5").substring(0, 8));

// 定義記憶體流

var ms = new memorystream();

// 定義加密流

var cs = new cryptostream(ms, des.createdecryptor(), cryptostreammode.write);

cs.write(inputbytearray, 0, inputbytearray.length);

cs.flushfinalblock();

return encoding.default.getstring(ms.toarray());

}

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