Calculating Message Checksum

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I am writing an application(TCP/IP) that interfaces between NDC Controller and Bank Host. I want to know how to calculate the checksum(total of the characters in the message field) of the message that is sent by controller to the Bank Host.
The checksum value should be of length 10 and should be Numeric value.
In short, I would like to have a source for a checksum funtion as shown in link:
http://en.wikipedia.org/wiki/File:Checksum.svg

Please help.

Posted 7-Jun-11 19:30pm

RashmitaS

Updated 12-Jun-11 23:27pm

v2

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-06-07T19:41:00

Solution 2

Choose a checksum algorithm and implement it. You have enough algorithms to choose from, see http://en.wikipedia.org/wiki/Checksum[^]. See the Web referenced from this article.

You can use already implemented Cryptographic Hash Function (http://en.wikipedia.org/wiki/Cryptographic_hash_function[^]) from the name space System.Security.Cryptography, for example, use one of the classed derived from System.Security.Cryptography.HashAlgorithm each representing a Cryptographic Hash Function from the "SHA" family (see http://en.wikipedia.org/wiki/SHA-2[^]) or MD5 (http://en.wikipedia.org/wiki/MD5[^]) using the class System.Security.Cryptography.MD5.

Note: Don't use MD5 for any security purposes, as this algorithm is considered broken, see http://en.wikipedia.org/wiki/MD5[^]. For checksum purposes it is good enough though.

[EDIT]
Here I found CRC implementation:
CRC Encoding[^].
There are many others.

—SA

Posted 7-Jun-11 19:41pm

Sergey Alexandrovich Kryukov

Updated 8-Jun-11 6:53am

v2

Comments

RashmitaS 8-Jun-11 2:29am

First of thanks for the suggestion. I did try SHA HashAlgorithm but it returns 40 characters. Actually i need the checksum of length 10 and the datatype should be numeric. Please suggest.

Sergey Alexandrovich Kryukov 8-Jun-11 12:54pm

OK, you did not ask about it. There are many other variants, see the very first link. Use something simple like CRC. See my update (after [EDIT]), for example.
--SA

RashmitaS 9-Jun-11 5:35am

Sorry if i could not make myself clear. In short, I would like to have a source for a checksum funtion as shown in link:
http://en.wikipedia.org/wiki/File:Checksum.svg

Sergey Alexandrovich Kryukov 12-Jun-11 18:28pm

Good.
Will you formally accept my solution (green button)?
--SA

[no name] 12-Jun-11 18:51pm

yes of course to have some points more, oh my god...

RashmitaS 13-Jun-11 2:35am

I didnot get the solution for the question i posted earlier. Can u please provide the solution so it can be formally accepted?

Sergey Alexandrovich Kryukov 13-Jun-11 3:39am

What was your earlier question? Why you want me to answer some other question to get anything from you? I gave you complete solution for this problem, it should be enough. If not, ask a question: what's your problem?
You did not what 40 characters -- use CRC. Problem solved.
--SA