Fixed. Sorry, French is my first language and I do my best in English, but I learn every day :)

No problem man, I was just wondering.

"an hashing algorithm" is also valid as a way to say "one hashing algorithm".

I find myself adding a "n" to "a" quite a bit since a lot of times it seems to flow better than using "a".

Only if you don't pronounce the "h", which is pretty nonstandard.

"An" can also be used if the first letter is an h and the first syllable is unstressed (an historical event is the example on the Wikipedia page), but, I'm pretty sure the h in hashing is in a stressed syllable, so that doesn't count either.

Reminds me of some native English speakers who say "an historic ..." Pretty common even in accents that won't drop the H. Seems like that word is an outlier though.

That's true, but the "h" there is followed by an "i", which sounds more natural. Omitting it in "ha" sounds odder, but it looks like it's just a typo.