MD5 Progress on Large Files

[Guest]

Is there any way to get progress from FileStream or MD5CryptoServiceProvider
while generating MD5 Hashes on large files (>4GB).

Or can I use a byte buffer to generate MD5 hashs that combine to create a
final hash?

StringBuilder sb = new StringBuilder();
MD5 md5 = new MD5CryptoServiceProvider();
byte[] hash = md5.ComputeHash(fs);
fs.Close();
foreach (byte hex in hash)
sb.Append(hex.ToString("x2"));
return sb.ToString();

Thanks,
Mike S

 

[Jon Skeet [C# MVP]]

Is there any way to get progress from FileStream or MD5CryptoServiceProvider
while generating MD5 Hashes on large files (>4GB).

You could wrap your stream with a ProgressIndicatorStream (this doesn't
exist, I'm just making it up) which passes all the requests through to
an underlying stream and raises events when it's read a certain amount.
Sorry, I'm not expressing myself particularly well - does that make
sense?

Or can I use a byte buffer to generate MD5 hashs that combine to create a
final hash?

I don't think that would be as nice as doing it on a single stream.

 

[Henning Krause [MVP - Exchange]]

Hello,

see
http://www.infinitec.de/articles/development/hashfileswithprogressreports.aspx.

Best regards,
Henning Krause