There are several of these encryption issues, and if it is for storing passwords, then you are probably all right (although I don’t remember exactly). However, if you encrypt any network traffic (even if it just receives the page via HTTPS), you need to register your application with the US government (if you are in the USA). While you receive this registration, Apple may allow you to sell your application in the store only for the United States.
Check this:
Using SSL in iPhone App - Export Matching
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