Add documentation for linux example#106
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Add a kernel module that provides libnat20 functionality to linux kernel modules. Also add a configuration to build a minimal linux image with buildroot and run in on qemu and a workflow to test build nat20lib.ko
This module creates a new character device class intended to implement the nat20 service protocol implementing DICE based device state attestation and an embedded CA.
The nat20crypto module implements the libnat20 crypto interface in terms of linux kernel crypto primitives. The module implements - deterministic ECDSA with curves P256 and P384. - Bytewise SHA-2 224/256/384/512 - HMAC - HKDF ED25519 is currently not supported.
…/linux_example_nat20device
…urm/linux_example_nat20crypto
…linux_example_libnat20
…linux_example_libnat20
This commandline tool provides a primitive interface to communicate with a nat20 device.
Adds a C integration test binary (nat20_integration_test) that exercises
the full DICE service stack via /dev/nat200. The test generates certificate
chains across all supported key type (P-256, P-384) and format (X.509,
COSE) permutations, verifies cryptographic signatures at each link, and
confirms that parent_path-based issuance produces identical results to
direct issuance after promote.
Test structure:
- Phase 1 (level 1): Generate CDI1, CDI2, ECA, ECA_EE certs and
signatures using parent paths of varying depth from the UDS level.
Verify all X.509 and COSE chains cryptographically.
- Phase 2 (level 2): After one promote, regenerate CDI2/ECA/ECA_EE/sign
with reduced parent path depth and assert byte-for-byte equality.
- Phase 3 (level 3): After second promote, regenerate ECA/ECA_EE/sign
with no parent path and assert equality.
Also includes:
- test_helpers.c: OpenSSL-based X.509 signature verification, public key
extraction, COSE_Sign1 parsing and verification, CWT subject public
key extraction, and compressed input computation.
- nat20_qemu_init.sh: init wrapper for running tests in QEMU CI.
- GitHub Action steps to build the rootfs and run the test suite in QEMU.
- Buildroot package (nat20test) with OpenSSL dependency.
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
This reverts commit 0612f25.
This reverts commit b159fbb.
…ple_integration_test
…nux_example_nat20cli
…nux_example_nat20cli
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
…nux_example_nat20cli
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