Re: AES_ENCRYPT() in php

[Yuriy Pavlutkin]

I can't to see your problem in details, but it seems the bug is in the fields length:
both AES_Encrypt() and rijindael_128 make padding of the plain text to 16-bytes blocks before encryption. Padding is made by ASCII-symbol, which code is equal to number of padded bytes.
Let we will think, that "xx" are chars hex code of our plain text. There are some examples of plain text padding:

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
--------------------------------------------------
xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx 01
xx xx xx xx xx xx xx xx xx xx xx xx xx xx 02 02
xx xx xx xx xx xx xx xx xx xx 06 06 06 06 06 06
xx xx xx xx xx 0B 0B 0B 0B 0B 0B 0B 0B 0B 0B 0B


if plain text block is equal to 16 or 32 bytes (multiply of AES block size) one more block will be added:

xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10

Try to increase variables (or fields) length for source plain text for encryption and for destination plain text for decryption: add 16 or more bytes.

One more advice: use Trim() for decryption result.



Edited 1 time(s). Last edit at 05/08/2006 02:11PM by Yuriy Pavlutkin.