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;
}
}