AESCrypt decryption between iOS and PHP

Question

I am having a heck of a time figuring out how to decrypt a string encrypted with the NSData+AESCrypt.m (Explained here)

I have been looking at a handful of other thr

Answer 1

First off, the Objective-C code you're using is pretty terrible:

• The keyspace is severely limited (presumably UTF-8 bytes terminated by a null byte, extended with null bytes to 32 bytes). The easiest way to generate a random key is to stick to ASCII, which limits you to about 223.6 bits for the default key size of 256 bits.
• Encryption is done in ECB mode.
• Data appears to be irreversibly padded with 0x0B.

Avoid it at all costs. It is not secure.

It can be "decrypted" in Python with something like this:

>>> import Crypto.Cipher.AES
>>> import base64
>>> Crypto.Cipher.AES.new('a16byteslongkey!'+'\0'*16).decrypt(base64.b64decode('7opqbb7sEVNoXplyQv/X8g=='))
'Hello\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b'