C Language to PHP convert Decryption and Encryption code.

I'm looking for an experienced coder to convert a C language code to a PHP code that will allow for the decoding and encoding. The original code is written in C and needs to be converted to a PHP code. This code needs to be capable of both decrypting and encrypting messages. I am open to using existing libraries, although they should only be used if absolutely necessary. I am looking for experienced coders with a strong understanding of both C and PHP to take on this project.