DES加密解密字串

金鑰隨機生成 ：

class des

// 建立key

public string generatekey()

descryptoserviceprovider descrypto = (descryptoserviceprovider)descryptoserviceprovider.create();

return asciiencoding.ascii.getstring(descrypto.key);

//預設金鑰向量

private static byte keys = ;

///

/// des加密字串

///

/// 待加密的字串

/// 加密金鑰,要求為8位

/// 加密成功返回加密後的字串，失敗返回源串

public string encryptdes(string encryptstring, string encryptkey)

trybyte rgbkey = encoding.utf8.getbytes(encryptkey.substring(0, 8));

byte rgbiv = keys;

byte inputbytearray = encoding.utf8.getbytes(encryptstring);

descryptoserviceprovider dcsp = new descryptoserviceprovider();

memorystream mstream = new memorystream();

cryptostream cstream = new cryptostream(mstream, dcsp.createencryptor(rgbkey,rgbiv), cryptostreammode.write);

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

cstream.flushfinalblock();

return convert.tobase64string(mstream.toarray());

catch

return encryptstring;

///

/// des解密字串

///

/// 待解密的字串

/// 解密金鑰,要求為8位,和加密金鑰相同

/// 解密成功返回解密後的字串，失敗返源串

public string decryptdes(string decryptstring, string decryptkey)

trybyte rgbkey = encoding.utf8.getbytes(decryptkey);

byte rgbiv = keys;

byte inputbytearray = convert.frombase64string(decryptstring);

descryptoserviceprovider dcsp = new descryptoserviceprovider();

memorystream mstream = new memorystream();

cryptostream cstream = new cryptostream(mstream, dcsp.createdecryptor(rgbkey,rgbiv), cryptostreammode.write);

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

cstream.flushfinalblock();

return encoding.utf8.getstring(mstream.toarray());

catch

return decryptstring;

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