PHP 3DES ENCRYPTION RESULT

[harsus]

Good day all, I need some help with a piece of code I wrote.

I have a 16 digit hex value whic I encrypt (3DES) with another 16 digit hex value. The result is a 32 digit hex value. The problem is I need to store the result in a 16 digit hex value to transport it to a host which will do the decryption.

 

$data = "3e5fa17b6ab1b1b1";

$key  = "0123456789abcdef";

$enc = mcrypt_cbc (mcrypt_3des, $key, $data, mcrypt_encrypt);  --> this results in 16 position raw binary data

$enc = bin2hex($enc);  --> I get a 32 digit hex value, but the space available will only fit a 16 digit hex value.

 

If i'm going about this totally wrong please let me know, this has been buggin me for some time now.

Any help would be grately appreciated.

Thank you.