On 07/12/2021 23:11, gordonisnz@xxxxxxxxx wrote:
Hello.
I'm looking at the various CRYPT / one-way encryption commands and i
was wondering if there is a way to create a crypt but restrict output
to alpha-numeric (a to z, A to Z and 0-9) without the special
characters ?
Basically ive got a starting reference - numeric over 10,000,000 and
other numbers and want to do a crypt (or something) but exclude
special characters from the crypt result.
The best I can think of is to do a crypt (or whatever) etc and then do
a preg_replace to remove the special characters etc..
The result will be shorter (length), but will be an alpha-numeric crypt.
--
Gordon.
What problem are you trying to solve by doing this?
`crypt` on its own doesn't tell us much as it's a library that can use
multiple algorithms.
It should be noted that (password) hashing algorithms already use a
restricted character set that is basically alphanumeric plus a few other
characters. The current defacto standard for password hashes is the
modular crypt format which you can see explained on the Description and
Version History sections of https://en.wikipedia.org/wiki/Bcrypt and the
Radix-64 character set used is described on
https://en.wikipedia.org/wiki/Base64#Radix-64_applications_not_compatible_with_Base64
