I'm assuming you mean the CHECKSUM function in SQL server; if not disregard.
Anyways ... no, no one has the code for CHICKSUM. Well the SQL Server team
must, but you shouldn't rely on it anyways - a hash function like CHECKSUM or
..NET's GetHashCode() can change from version to version so you shouldn't rely
on it.
What you should do is use a well known hash algorithym like MD5 or SHA1, and
use that for your comparisons. See the System.Security.Cryptography namespace
in .NET SDK.
[quoted text, click to view] "Rain" wrote:
> hi,
>
> need help here, does anyone know how to use or does any one have the code
> for checksum? I want to checksum a string to be sent using udp and checksum
> it again when received.. does anyone know the code for checksum? Thanks i
The easiest way is use Hash functions like MD5, SHA1.
Check out them in System.Security.Cryptography namespace.
Note that MD5 generates a byte array of 128 bytes (SHA1, 160 bytes).
You can convert them to hex string if needed.
[quoted text, click to view] Rain wrote:
> hi,
>
> need help here, does anyone know how to use or does any one have the code
> for checksum? I want to checksum a string to be sent using udp and checksum
> it again when received.. does anyone know the code for checksum? Thanks i
> would really really appreciate it. Thanks in advance..
I mean bits, not bytes. And someone else already answered above, did
not notice.
[quoted text, click to view] Truong Hong Thi wrote:
> The easiest way is use Hash functions like MD5, SHA1.
> Check out them in System.Security.Cryptography namespace.
> Note that MD5 generates a byte array of 128 bytes (SHA1, 160 bytes).
> You can convert them to hex string if needed.
>
> Rain wrote:
> > hi,
> >
> > need help here, does anyone know how to use or does any one have the code
> > for checksum? I want to checksum a string to be sent using udp and checksum
> > it again when received.. does anyone know the code for checksum? Thanks i
> > would really really appreciate it. Thanks in advance..
[quoted text, click to view] Rain wrote:
> hi,
>
> need help here, does anyone know how to use or does any one have the code
> for checksum? I want to checksum a string to be sent using udp and
> checksum it again when received.. does anyone know the code for checksum?
> Thanks i would really really appreciate it. Thanks in advance..
Hi,
There are a number of checksum functions available, each with their merits
(and their disadvantages). Hashing (as has been mentioned) is a popular
method of creating a checksum, but there are also algorithms such as CRC -
the Cyclic Redundancy Check.
For your reference, here is an URL to an implementation of CRC:
http://www.codeproject.com/csharp/marcelcrcencoding.asp --
Hope this helps,
Tom Spink
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