hmac within Swift

Question

I am pretty new to swift and have been struggling to find a solution to hashing a string into a string.

I need to take a string and hash it to sha512 and return as a string to pass via HTTP Header to a GET URL request.

I have seen some posts around using CommonCrypto, which has a lot of comments suggesting to not use this in Swift, but I've not found much else.

I am taking an API Secret key, hashing the URL and returning a string.

Would seem odd that Swift doesn't have Framework or classes for this.

Thanks in advance,

Bombhead

Swift

1.2k

Posted by

MrBombHead

Reply

Add a Comment

Answer 1

I have seen some posts around using CommonCrypto, which has a lot of comments suggesting to not use this in Swift, but I've not found much else.

CommonCrypto is definitely the right API for this. The problem is that it’s tricky to call from Swift, partly because it’s a low-level C API and partly for weird tooling issues (it doesn’t have a module map). If you’re doing simple stuff — creating an app that needs to calculate an HMAC, for example — my recommendation is that you wrap the necessary CommonCrypto function in a tiny Objective-C wrapper and call that from Swift. This post has a concrete example of how to do this.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Posted by

eskimo

Add a Comment

Answer 2

Have you looked at this:

https://developer.apple.com/library/content/documentation/Security/Conceptual/CertKeyTrustProgGuide/KeyGen.html

The date on the document is 2017, and there are Swift code examples, so I assume it's current.

Posted by

QuinceyMorris

Add a Comment

Answer 3

I have seen some posts around using CommonCrypto, which has a lot of comments suggesting to not use this in Swift, but I've not found much else.

CommonCrypto is definitely the right API for this. The problem is that it’s tricky to call from Swift, partly because it’s a low-level C API and partly for weird tooling issues (it doesn’t have a module map). If you’re doing simple stuff — creating an app that needs to calculate an HMAC, for example — my recommendation is that you wrap the necessary CommonCrypto function in a tiny Objective-C wrapper and call that from Swift. This post has a concrete example of how to do this.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Posted by

eskimo

Add a Comment

hmac within Swift

Accepted Reply

Replies