Add NFC/mfp_reader 1.0

[Defensor7]

MIFARE Plus SL3 reader, dumper and emulator. Identifies cards, recovers per-sector keys via dictionary attack, dumps blocks, and emulates the card with optional write-back.

Source: https://github.com/Defensor7/flipperzero-mfp-reader

Application Submission

Initial release of MFP Reader v1.0 — a standalone Flipper Zero application for working with MIFARE Plus SL3 smart cards.

The app implements the full MFP SL3 protocol over ISO 14443-4A using only stock firmware APIs (no firmware modifications, no extra patches). AES-128 is provided by a bundled tiny-AES-c library because mbedtls is not exported from the Flipper firmware.

Features

• Card identification — UID, SAK, ATQA, ATS parsing, manufacturer decoding via UID[0], BCC validation against block 0
• Full sector dump — recovers both KeyA and KeyB for every sector via dictionary attack with the bundled default key set plus any user .dic files dropped into apps_data/mfp_reader/
• Live visual progress — custom view with a per-sector activity grid that fills in real time as keys are found and blocks are read
• Hex viewer — scrollable monospace dump of every block (uses TextBoxFontHex)
• Save / Load — versioned .mfp text format with editable file names and a duplicate-name validator
• MFP SL3 emulation — full ISO 14443-4A listener implementing GetVersion, AuthFirst (0x70), AuthNonFirst (0x76), ReadEncrypted (0x31), WriteEncrypted (0xA1) with proper CMAC verification and session-key derivation per NXP AN10922
• Two emulation modes — Writable (the dump file is updated when the reader writes) or Read-only (writes are discarded)
• Delete saved dumps from inside the app via Actions → Delete

The dictionary attack uses an optimization that tracks the last successful KeyA and KeyB and tries them first on each new sector — typical cards reuse the same key set, so most sectors auth in a single attempt instead of a full dictionary pass.

Tested on

• Flipper Zero with stock firmware API 87.1 (Release 1.4.3)
• Real MIFARE Plus EV1 SL3 2K card (NXP MF1PLUS80)
• The 4K layout (40 sectors) is implemented but has not been tested on real hardware

Extra Requirements

None. No external hardware add-ons, no patched firmware, no extra dependencies. Builds with stock uFBT and runs on any Flipper Zero with firmware API 87.1 or newer.

Author Checklist (Fill this out)

• I've read the contribution guidelines and my PR follows them
• I own the code I'm submitting or have code owner's permission to submit it
• I have validated the manifest file(s) with python3 tools/bundle.py --nolint applications/CATEGORY/APPID/manifest.yml bundle.zip

Reviewer Checklist (Don't fill this out)

• Bundle is valid
• There are no obvious issues with the source code
• I've ran this application and verified its functionality