/atecc-ecdh-python

atecc-ecdh-python - An ECDH Python Example for ATECC608A

Primary LanguagePython

atecc-ecdh-python - An ECDH Python Example for ATECC608A

This example shows the Elliptic Curve Diffie Hellman key exchange with ephemeral key created on ATECC608A.

Prerequisites

  • Debian 10 host
  • Raspberry Pi device
    • e.g. Zero
    • Raspberry Pi OS
    • Attached ATECC608A I2C module
      • Personalized, locked and ready to use

Setup

apt update
apt install -y python3 python3-venv build-essentials
python3 -m venv
source venv/bin/activate
pip3 install wheel
pip3 install -r requirements.txt

ECDH procedure

  1. On device: Generate ephemeral key on ATECC608a via python3 genkey_device.py
  2. Exchange ec256-device.pub with host
  3. On host: Generate ephemeral key using python python3 genkey_host.py
  4. Exchange ec256-host.pub with host
  5. On device: Derive ec256-device.key via python3 ecdh_device.py
  6. On host: Derive ec256-host.key via python3 ecdh_host.py
  7. On host: Calculate md5 ec256-host.key
  8. On device: Calculate md5 ec256-device.key
  9. Compare md5 hashes and see that they match