@Jason C I'm not a Swift developer, but in any language I'd first choose a good library before doing my own OAuth 1.0 implementation. Having said that, I have done it in C#and PowerShell, and getting it right can be a real pain. There appear to be many pods available at cocoapods.org for OAuth1 (OhhAuth, OAuthSwift, and lots more). If nothing else, you could always look at the source code for those packages on github to see how they are generating the signature, if you'd rather do it yourself.