PHP encrypt/decrypt default_charset problem

Question

I need to encrypt files at one computer and open it another one using PHP without external libraries. The code should work at both PHP4 and PHP5.

Encryption function makes str_split of the string and encodes each character (ord) using str_split of password. Then it makes chr and I get binary data. This binary data is encoded using base64_encode and I get ascii string.

I transfer this file to another computer who knows the password. I make base64_decode and make decrypt.

The problem appeares sometimes because the first computer has ASCII default_charset and second has UTF-8. That's why nth-char $temproraryBinaryString[$n-1] may have different values at these computers.

Can I ask PHP to treat all strings as ASCII if I cannot control php.ini at any of this computers?

Don’t reinvent the wheel but use an existing encryption algorithm. — Gumbo
– Gumbo, Commented May 20, 2011 at 16:24
possible duplicate of Best way to use PHP to encrypt and decrypt? — Alix Axel
– Alix Axel, Commented May 20, 2011 at 16:45

Community · Accepted Answer · 2023-11-20 22:45:59Z

1

Take a look at the discussion on this post, as it talks about two-way encryption, using PHP mcrypt, which is what you should use. Two-way encryption: I need to store passwords that can be retrieved

edited Nov 20, 2023 at 22:45

CommunityBot

11 silver badge

answered May 20, 2011 at 16:29

toneplex

6735 silver badges6 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Stephane Gosselin Over a year ago

+ oned for mcrypt, just be aware the 2 servers need the same php versions. Too lazy to look it up myself but I think the implementation or something changed between earlier version and 5.3.

Alix Axel · Accepted Answer · 2011-05-20 16:50:50Z

0

I wrongly flagged as duplicated but it's not, what you're talking is encoding not encryption, just try:

$ascii = iconv('UTF-8', 'ASCII//TRANSLIT//IGNORE', $string);

This should give you a clean ASCII string to work on with str_split() and so on.

answered May 20, 2011 at 16:50

Alix Axel

155k100 gold badges406 silver badges509 bronze badges

Collectives™ on Stack Overflow

PHP encrypt/decrypt default_charset problem

2 Answers 2

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related