Picopass: handle NR-MAC auth for legacy cards

[bettse]

What's new

• Fixes to the save partial flow when dealing with a non-SE card (found in discord)

Verification

• Remove AA1/standard key from dictonary
• Try to read card and get read failed
• Use "Save Partial"
• Emulate partial dump to reader
• Get "NR-MAC Saved!"

Checklist (For Reviewer)

• PR has description of feature/bug or link to Confluence/Jira task
• Description contains actions to verify feature/bugfix
• I've built this code, uploaded it to the device and verified feature/bugfix

[bettse]

cc @ezhang7423

[ezhang7423]

Affirming that this change worked for me

[bettse]

@skotopes When you have time, can you review this?

[skotopes]

@bettse yep, I'll merge it later today.

[skotopes]

is it ok that after doing such thing to the card it gives this?

[bettse]

is it ok that after doing such thing to the card it gives this?

you did the NR-MAC process?

[skotopes]

Yep. then used another flipper to read partial dump, nr-mac was saved.
Then I restored assets and tried to read this card and it gets me this.

PS: Removing picopass folder with nr-mac data restores reading.

[bettse]

Yeah, this is expected. when doing the NR-MAC read we don't know the key (all 00's), but we do read the data. The only time this preempts is when the {nr}_{mac} file exists, which is easy to clean up, as you saw

[bettse]

I'll make a note that perhaps we could put on the screen "Read using NR-MAC" instead of the key

[skotopes]

ok ok )