cryptdecryptor.cs

这是可以加密&解密字符串

using System;
using System.IO;
using System.Security.Cryptography;

namespace EncryptDecrypt
{
    /// <summary>
    /// 解密类。
    /// </summary>
    public class CryptDecryptor
    {
        private Stream inputStream;
        private Stream outputStream;
        private CryptoStream cstream = null;

        public CryptDecryptor(Stream inputStream, Stream outputStream)
        {
            this.inputStream = inputStream;
            this.outputStream = outputStream;
        }

        public Stream InputStream
        {
            get { return inputStream; }
            set { inputStream = value; }
        }

        public Stream OutputStream
        {
            get { return outputStream; }
            set { outputStream = value; }
        }

        public void Execute()
        {
            //定义对称算法对象实例和接口
            SymmetricAlgorithm symm = new RijndaelManaged();
            ICryptoTransform transform = symm.CreateDecryptor();
            cstream = new CryptoStream(outputStream, transform, CryptoStreamMode.Write);
            byte[] buffer = new byte[inputStream.Length];
            inputStream.Read(buffer, 0, buffer.Length);
            cstream.Write(buffer, 0, buffer.Length);
            cstream.FlushFinalBlock();
            cstream.Close();
        }

        private void Close()
        {
            if (cstream != null)
            {
                cstream.Close();
                cstream = null;
            }
        }
    }
}