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Behind the 6-digit code: Building HOTP and TOTP from scratch

(blog.dogac.dev)
248 points dogacel | 3 comments | 11 Apr 25 13:06 UTC | HN request time: 1.039s | source
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3eb7988a1663 ◴[15 Apr 25 01:57 UTC] No.43688279[source]▶
It is a bit terse, but there is a 20-line Python implementation which cleared up the ideas for me: https://github.com/susam/mintotp
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1. SkiFire13 ◴[15 Apr 25 06:04 UTC] No.43689457[source]▶
Those `>Q` and `>L` just make it more confusing for me, they just feel like a different language in the language...
replies(2): >>43689735 #>>43690191 #
2. lucb1e ◴[15 Apr 25 06:51 UTC] No.43689735[source]▶
Perhaps you could contribute a version in a language that uses more descriptive names, something like BitPacker.WriteInt64 for >Q if I'm guessing correctly what that means (I'd equally need to check the docs to know what format these letters represent, but I don't find it too confusing when you know it's simply some binary / byte array version of the same thing)
3. woadwarrior01 ◴[15 Apr 25 08:07 UTC] No.43690191[source]▶
They are well documented and essentially are a DSL with the Python struct module for specifying memory representations of packed structures.

https://docs.python.org/3/library/struct.html#format-charact...