流扩展：StreamExtensions-创新互联

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;

namespace Beehive.CloudReader.Utility
{
///   /// Stream 扩展
///   public static class StreamExtensions
    {
///    /// 
   /// 
   ///    ///    ///    ///    public static System.IO.Stream Encrypt(this System.IO.Stream stream, byte[] key)
where Algorithm : SymmetricAlgorithm
        {
var alg = Activator.CreateInstance();
            PasswordDeriveBytes pdb= new PasswordDeriveBytes(key, null);
            alg.Key= pdb.GetBytes(alg.KeySize / 8);
            alg.GenerateIV();
            alg.IV= pdb.GetBytes(alg.IV.Length);

            ICryptoTransform encryptor= alg.CreateEncryptor();
return new CryptoStream(stream, encryptor, CryptoStreamMode.Read);
        }


///    /// 
   /// 
   ///    ///    ///    ///    public static System.IO.Stream Decrypt(this System.IO.Stream stream, byte[] key)
where Algorithm : SymmetricAlgorithm
        {
var alg = Activator.CreateInstance();
            PasswordDeriveBytes pdb= new PasswordDeriveBytes(key, null);
            alg.Key= pdb.GetBytes(alg.KeySize / 8);
            alg.GenerateIV();
            alg.IV= pdb.GetBytes(alg.IV.Length);

            ICryptoTransform encryptor= alg.CreateDecryptor();
return new CryptoStream(stream, encryptor, CryptoStreamMode.Read);
        }
///    /// 
   /// 
   ///    ///    public static byte[] ToByteArray(this System.IO.Stream stream)
        {
byte[] buffer = new byte[1000];
int readLength = 1;
using (MemoryStream ms = new MemoryStream())
            {
while (readLength > 0)
                {
                    readLength= stream.Read(buffer, 0, buffer.Length);
if (readLength > 0)
                        ms.Write(buffer,0, readLength);
                }
return ms.ToArray();
            }
        }
    }
}

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