PHP + Public/Private Key Cryptography?

kevlar007

Heya,

    I have the need for a _really_ simple implementation of public/private key cyrptography in PHP (preferably free).  The idea is to encrypt a credit card number using a public key and store it in my database so that I can later decrypt it with my private key when it comes time to process the billing...

~~K

Sgarissta

Depending on your OS take a look at either GPG(open source platform independent), or PGP (only has a windows client i believe).

kevlar007

Yeah, I was hoping there would be a PHP lib to do it, but I guess not. My environment is windows, so I think I'll just whip of a .NET program to read in the value, encrypt it and spit it back out.

Weedpacket

There is a PHP library for it. It uses mcrypt. Look for it in a PHP manual near you.

kevlar007

Those are all cipher mode algorithms in mcrypt.

laserlight

Those are all cipher mode algorithms in mcrypt.

You mean symmetric encryption algorithms?

Yes, at the moment that seems to be the case.
You're probably better off writing your own program, since you dont want to use GPG.

kevlar007

What an un-enlightening post. You would have been better off not posting at all.

laserlight

Actually, I'm just buying time to keep you here while I search a little more.

Irritating when I do find the answer, but the user has run away.

laserlight

hmm...

do you really not want to use GPG?

It should be possible to call GPG from PHP, and then use it to directly do the crypto work.

Conversely there is SSL for use directly (assuming PHP was compiled with SSL support), but that probably doesnt qualify as "really simple implementation of public/private key cyrptography".