C#加解密

Question

解密加密c#encoding

Answer 1

http://msdn.microsoft.com/en-us/library/system.security.cryptography.des(v=vs.110).aspxDES算法规定 KEY 的长度是 64位， 也就是八个字节
 static string Encrypt(string str)
        {
            DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();
            byte[] key = Encoding.Unicode.GetBytes(encryptKey);
            Console.WriteLine(key.Length);
           byte[] data = Encoding.Unicode.GetBytes(str);
            MemoryStream MStream = new MemoryStream();
            CryptoStream CStream = new CryptoStream(MStream, descsp.CreateEncryptor(key, key), CryptoStreamMode.Write);
            CStream.Write(data, 0, data.Length);
            CStream.FlushFinalBlock();
            return Convert.ToBase64String(MStream.ToArray());
        }经过编码后，“oyea” KEY的字节数是8位 所以是合法的。 “1111”，“你你你你”的字节数也是8位