# polhenarejos/pico-fido

FIDO Passkey for Raspberry Pico and ESP32

Repository: https://github.com/polhenarejos/pico-fido
Canonical: https://ross.abutalabs.com/products/pico-fido
Homepage: https://www.picokeys.com
Language: C
License: AGPL-3.0
License Family: copyleft
Topics: cryptography, fido, fido-u2f, fido2, firmware, raspberry-pi-pico
Last push: 2026-08-26T03:04:29+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 87, longevity 100
- inputs: {"age_days": 1463, "days_push": 7, "days_rel": 10, "gap_med": 57.5, "n_releases_24m": 9}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1446, forks 225 (observed 2026-08-28T04:04:45.234079+00:00)

## What it is
Open-source firmware that turns a Raspberry Pi Pico (RP2040/RP2350) or ESP32-S3 microcontroller into a FIDO2 passkey authenticator, supporting CTAP 2.3, WebAuthn, U2F, OATH/TOTP, and vendor extensions like vaulted credential export. It is part of the PicoKeys ecosystem and is licensed under AGPL-3.0.

## Use cases
- turn a Raspberry Pi Pico into a FIDO2 security key
- hardware-backed passkey for passwordless login
- two-factor authentication with a cheap USB token
- store TOTP and OATH codes on a physical device
- WebAuthn authenticator for browser sign-in
- backup and export passkeys between devices
- hardware-backed SSH and email signing alternatives

## When to choose
- you want a FIDO2/U2F authenticator on a $4 microcontroller instead of a commercial YubiKey
- you need discoverable credentials, PIN verification, and OATH/TOTP in one device
- you want open-source, auditable firmware for your security key
- you need credential export/import via Pico Vault or backup with 24 words

## When to avoid
- you need a general-purpose smart card, HSM, or OpenPGP token - use Pico HSM or Pico OpenPGP instead
- you require the strongest hardware protection on RP2040, which lacks Secure Boot/OTP key storage
- you need a commercial license without AGPL-3.0 source disclosure obligations
- you want a plug-and-play product rather than flashing firmware yourself

## Facets
- artifact type: application
- maturity: active
- function: auth, cryptography, security, embedded
- domain: security, embedded-systems, privacy, developer-tools
- platform: embedded, iot, cross-platform, cli
- tags: fido2, passkey, webauthn, u2f, ctap, totp, hardware-authenticator, raspberry-pi-pico, esp32, usb-security-key, yubikey-compatible, firmware, otp, hmac-secret, resident-keys

## Member repositories
- polhenarejos/pico-fido (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:45.234079+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:36:11.310780+00:00, confidence not recorded.
  - readme: https://github.com/polhenarejos/pico-fido (fetched 2026-08-28T04:04:45.234079+00:00, sha 3c94a8898074)
  - homepage: https://www.picokeys.com (fetched 2026-08-29T11:46:04.132773+00:00, sha 609a56c649fd)
  - site_page: https://www.picokeys.com/getting-started (fetched 2026-08-29T11:46:04.136190+00:00, sha 1e2bc3f66488)
  - site_page: https://docs.picokeys.com (fetched 2026-08-29T11:46:04.138244+00:00, sha 7939af5f0585)
- Data as of 2026-08-30T08:39:29.467469+00:00.