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, 5 Jan 2005 52.7K 14
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How to compute the same hash as MD5SUM does (HEX).

Reason For This Howto

As you may know the MD5CryptoService, which the .NET Framework uses, doesn't create an md5 sum's string. So you only have the pure byte[] which isn't that useful if you want to use it in a database or on your Web Server to compare the sum with your file's sum! So, if many people have no idea how to get their sum into the right way, here's my howto to create the same sums like "md5sum" does:


This is the second version with the Hex-bug fixed.

using System.Security.Cryptography;
string MD5SUM(byte[] FileOrText) //Output: String<-> Input: Byte[] //
return BitConverter.ToString(new 

// Quite simple isn't it? I hope you enjoyed this tiny article and 
//I hope I could help ya! //

You can use this example of course for SHA1 as well, just change the MD5CryptoServiceProvider to SHA1CryptoServiceProvider.


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About the Author

Max Gattringer
Austria Austria
I am Max Gattringer an Austrian student - I've got a passion for programming C#, cryptograpy and nearly everything concerning PCs Big Grin | :-D

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Comments and Discussions

GeneralThis is great! Pin
mondokat3-Apr-07 10:27
membermondokat3-Apr-07 10:27 
GeneralMD5 Pin
ARROLLO2-Jan-06 14:12
memberARROLLO2-Jan-06 14:12 
GeneralPerformance Pin
axelriet2-Feb-05 16:03
memberaxelriet2-Feb-05 16:03 
GeneralYeah, you're right ;-) Pin
Anonymous7-Jan-05 12:36
sussAnonymous7-Jan-05 12:36 
GeneralAnother suggestion Pin
MrEyes5-Jan-05 23:09
memberMrEyes5-Jan-05 23:09 
GeneralJust two suggestions Pin
Dennis C. Dietrich5-Jan-05 10:58
memberDennis C. Dietrich5-Jan-05 10:58 
GeneralRe: Just two suggestions Pin
Robert Rohde5-Jan-05 20:09
memberRobert Rohde5-Jan-05 20:09 
GeneralRe: Just two suggestions Pin
Dennis C. Dietrich6-Jan-05 1:08
memberDennis C. Dietrich6-Jan-05 1:08 
GeneralRe: Just two suggestions Pin
Jeffrey Sax6-Jan-05 13:52
memberJeffrey Sax6-Jan-05 13:52 
Robert Rohde wrote:
First rule for optimizing: Only optimize what is relevant for optimization (90-10 rule).

I'm with Dennis on this one. This isn't a question of optimization, since it would take roughly the same time and effort to write the "optimized" version during the initial coding. The pattern is well-established and it shouldn't require any more mental resources to apply it.

One could even make an argument that it would take some thinking on the part of someone reading the code to figure out why you chose not to follow the generally accepted best practice.


Everything should be as simple as possible, but not simpler.
    -- Albert Einstein

Numerical components for C# and VB.NET
GeneralRe: Just two suggestions Pin
Max Gattringer7-Jan-05 12:52
memberMax Gattringer7-Jan-05 12:52 

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