EDIT: before you edit that one as well to make me look like a fool:
Oh come on - you know you left out a 123 and had to edit!
@
hardy_practiceOn topic:
The fingering I indicated is my standard one, and I do the reverse in the right hand (4 on B flat). While not the fastest variant for the chromatic scale in general, for this passage it's perfectly adequate, even a tempo. It's smooth and it's also easy for the brain:
1) thinking from the center of the keyboard (the central d), white-white-black always gets 123, left hand descending, right hand ascending.
2) within the block of three black keys 1234 (4 on F# left; 4 on Bflat right) and one group of two notes is left which can be readily fingered (generally, 1-3 makes sense, but you can also take 4-5 if you want to play faster than is required in this particular passage. I don't know, however, if the OP is flexible enough to do that).
Off topic:
I just asked the admin to check whether I really edited that post (= reply # 2) or not and if yes, when (although it's not visible for us, it must be visible for him). Heaven help you if I didn't or if I did so before you posted your silly reply (the one I quoted from reply # 3, which you edited afterwards) because you may be forced to create your 6th account on this forum. Stop the provocations, please, mr. keyboardclass + all other aliases you are so easily recognized by!