Programming notes

String Encryption

Ecco come criptare e decriptare una semplice stringa di testo:

private static byte[] arrDESKey = new byte[] {12, 16, 63, 156, 58, 4, 218, 32};
private static byte[] arrDESIV = new byte[] {55, 103, 243, 79, 36, 99, 17, 3};

        public static string Encrypt(string str)
        {
            DESCryptoServiceProvider objDES = new DESCryptoServiceProvider();
            MemoryStream objMemoryStream = new MemoryStream();
            CryptoStream objCryptoStream = new CryptoStream(objMemoryStream,objDES.CreateEncryptor(arrDESKey,arrDESIV),CryptoStreamMode.Write);
            StreamWriter objStreamWriter = new StreamWriter(objCryptoStream);
            objStreamWriter.Write(str);
            objStreamWriter.Flush();
            objCryptoStream.FlushFinalBlock();
            objMemoryStream.Flush();
            return Convert.ToBase64String(objMemoryStream.GetBuffer(), 0, (int)objMemoryStream.Length);
        }
        public static string Decrypt(string str)
        {
            DESCryptoServiceProvider objDES = new DESCryptoServiceProvider();
            byte[] arrInput = Convert.FromBase64String(str);
            MemoryStream objMemoryStream = new MemoryStream(arrInput);
            CryptoStream objCryptoStream = new CryptoStream(objMemoryStream,objDES.CreateDecryptor(arrDESKey,arrDESIV),CryptoStreamMode.Read);
            StreamReader  objStreamReader  = new StreamReader(objCryptoStream);
            return objStreamReader.ReadToEnd();
        }