md5哈希c语言程序,【笔记】C Sharp哈希值计算MD5

[C#] 纯文本查看 复制代码public delegate void AsyncCheckHeadler(AsyncCheckEventArgs e);

public class MD5Checker

{

//支持所有哈希算法

private static HashAlgorithm hashAlgorithm;

//文件缓冲区

private static byte[] buffer;

//文件读取流

private static Stream inputStream;

public event AsyncCheckHeadler AsyncCheckProgress;

///

/// 返回指定文件的MD5值

///

///

///

public static string Check(string path)

{

if (!File.Exists(path))

throw new ArgumentException(string.Format(", 不存在", path));

FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);

MD5CryptoServiceProvider md5Provider = new MD5CryptoServiceProvider();

byte[] buffer = md5Provider.ComputeHash(fs);

string resule = BitConverter.ToString(buffer);

resule = resule.Replace("-", "");

return resule;

}

public void AsyncCheck(string path)

{

if (!File.Exists(path))

throw new ArgumentException(string.Format(", 不存在", path));

int bufferSize = 1048576;//缓冲区大小，1MB

buffer = new byte[bufferSize];

//打开文件流

inputStream = File.Open(path, FileMode.Open);

hashAlgorithm = new MD5CryptoServiceProvider();

//异步读取数据到缓冲区

inputStream.BeginRead(buffer, 0, buffer.Length, new AsyncCallback(AsyncComputeHashCallback), null);

}

private void AsyncComputeHashCallback(IAsyncResult result)

{

int bytesRead = inputStream.EndRead(result);

//检查是否到达流末尾

if (inputStream.Position < inputStream.Length)

{

//输出进度

string pro = string.Format("{0:P0}", (double)inputStream.Position / inputStream.Length);

if (null != AsyncCheckProgress)

AsyncCheckProgress(new AsyncCheckEventArgs(AsyncCheckState.Checking, pro));

var output = new byte[buffer.Length];

//分块计算哈希值

hashAlgorithm.TransformBlock(buffer, 0, buffer.Length, output, 0);

//异步读取下一分块

inputStream.BeginRead(buffer, 0, buffer.Length, new AsyncCallback(AsyncComputeHashCallback), null);

return;

}

else

{

//计算最后分块哈希值

hashAlgorithm.TransformFinalBlock(buffer, 0, bytesRead);

}

string md5 = BitConverter.ToString(hashAlgorithm.Hash).Replace("-", "");

AsyncCheckProgress(new AsyncCheckEventArgs(AsyncCheckState.Checking, md5));

//关闭流

inputStream.Close();

}

}

public enum AsyncCheckState

{

Completed,

Checking

}

public class AsyncCheckEventArgs : EventArgs

{

public string Value { get; private set; }

public AsyncCheckState State { get; private set; }

public AsyncCheckEventArgs(AsyncCheckState state, string value)

{

this.Value = value; this.State = state;

}

}