8-bit Checksum in intel-hex format?

Hi, I would like to have a function to coint it. There are a lot of checksum codes in the internet, but there are not what I looking for. I need something like this:

http://easyonlineconverter.com/converters/checksum_converter.html

But I am not able to find informations.

Thanks in advance.

[Guillaume]

"I need something like this"

What makes you think you need this? It's probably the worst checksum algorithm I've ever seen. Not everything you find on the web is a good idea.

In any case, if you really need this algorithm, why don't you implement it? It's trivial. it tells you it's the 2's compliment of addition of all bytes (mispelling courtesy of the original author!)