Do any of you know if I need to be concerned about US cryptography export regulations if I am generating an MD5 hash of a string with the Common Crypto library? I know this can be an issue when wanting to distribute worldwide on the app store but I am fairly unfamiliar with cryptography and my google searches on the subject have only seemed to turn up vague information on the regulations, but enough information on cryptography to make my head hurt.

I am only using the MD5 hash for transmitting/storing passwords to avoid plain text if that makes any difference.