I have a problem that I've been trying to solve over the last couple of days and I have had no success whatsoever. Basically, I'm RC4 encrypting a short string in a C program, which creates a connection to an url and sends the encrypted string as a parameter, which I'm "_GET-ing" with my PHP script. The encrypted string is converted from binary to hex before it is inserted into the url. That works fine. I can encrypt and decrypt the code on my computer just fine, even if I'm using different implementations/tools. Decrypting the code in the PHP script, however, just gives me a mess. The hex codes also don't match if if encode the very same plain string within the PHP script and compare the results with what I get from my c program. I'm using the Crypt_RC4 class package from PEAR. I scanned over the code and it seems to be using the very same implementation that I use in my C program. I'm starting to think that PHP encodes strings in a different way than my C program does. I'm using just plain vanilla UTF8 8-bit signed char array c-strings. I'm aware that RC4 is a stream key encryption mechanism, so that's not the problem here.
Any help is greatly appreciated. I really don't know what else I can try to get this to work. It is frustrating because it seems to be such a simple task.
Thank you very much.