数据加密之文件/流加密解密
2015-05-06 14:39 糯米粥 阅读(781) 评论(0) 编辑 收藏 举报1 /// <summary> 2 /// 为EndCallback提供数据 3 /// </summary> 4 public class EndState 5 { 6 internal EndState(bool isCancel, object state) 7 { 8 IsCancel = isCancel; 9 State = state; 10 } 11 12 /// <summary> 13 /// 是否取消退出的 14 /// </summary> 15 public bool IsCancel { get; private set; } 16 17 /// <summary> 18 /// 获得传递的参数 19 /// </summary> 20 public object State { get; private set; } 21 } 22 23 24 /// <summary> 25 /// 为ProgressCallback提供数据 26 /// </summary> 27 public class ProgressState 28 { 29 internal ProgressState(long byteRead, long totalBytesLength, object state) 30 { 31 BytesRead = byteRead; 32 TotalBytesLength = totalBytesLength; 33 State = state; 34 } 35 36 /// <summary> 37 /// 获得已经计算完成的字节数 38 /// </summary> 39 public long BytesRead { get; private set; } 40 41 /// <summary> 42 /// 获得总字节数 43 /// </summary> 44 public long TotalBytesLength { get; private set; } 45 46 /// <summary> 47 /// 获得传递的参数 48 /// </summary> 49 public object State { get; private set; } 50 }
测试代码：
1 //------下面为对文件/流加密解密的需要实例化的部分------ 2 3 /// <summary> 4 /// 完成计算的回调 5 /// </summary> 6 public delegate void EndCallback(EndState endState); 7 8 /// <summary> 9 /// 进行计算时的回调 10 /// </summary> 11 public delegate void ProgressCallback(ProgressState progressState); 12 13 private bool _cancel; //取消计算 14 15 /// <summary> 16 /// 停止计算 17 /// </summary> 18 public void Stop() 19 { 20 _cancel = true; 21 } 22 public void DecryptData(Stream inStream, Stream outStream, SymmetricAlgorithm alg, ProgressCallback progressCallback, EndCallback endCallback, object state) 23 { 24 const int bufferSize = 100; 25 _cancel = false; 26 27 long bytesRead = 0L; 28 long totalBytesLength = inStream.Length; 29 var buffer = new byte[bufferSize]; 30 31 using (var encStream = new CryptoStream(inStream, alg.CreateDecryptor(), CryptoStreamMode.Read)) 32 { 33 int num; 34 do 35 { 36 num = encStream.Read(buffer, 0, bufferSize); 37 outStream.Write(buffer, 0, num); 38 if (progressCallback == null) continue; 39 bytesRead += num; 40 progressCallback(new ProgressState(bytesRead, totalBytesLength, state)); //进度回调 41 } while (num > 0 && !_cancel); 42 if (endCallback != null) endCallback(new EndState(_cancel, state)); //计算结束回调 43 } 44 } 45 46 public void DecryptData(string inFileName, string outFileName, SymmetricAlgorithm alg, ProgressCallback progressCallback, EndCallback endCallback, object state) 47 { 48 using (var infs = new FileStream(inFileName, FileMode.Open, FileAccess.Read, FileShare.Read)) 49 { 50 using (var outfs = new FileStream(outFileName, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Read)) 51 { 52 DecryptData(infs, outfs, alg, progressCallback, endCallback, state); 53 } 54 } 55 }
