Cozy

Cozy can be linked as an external module to any Zephyr app. This library is built on mbedTLS and NanoCBOR.

Current coverage of RFC 8152

• Encode/decode COSE Sign1 objects
• Encode/decode COSE Encrypt0 objects
• EC signature algorithms: NIST P-256, NIST P-384
• AEAD algorithms: AES-GCM 128, AES-GCM 192, AES-GCM 256

Usage

Add the following line to your app's CMakeLists.txt:

set(ZEPHYR_EXTRA_MODULES <absolute_path_to>/cozy)

Add the following line to your app's prj.conf:

CONFIG_COZY=y

Access the Cozy API from your source files with #include <cozy/cose.h>.

Tests and examples

Run west build -t run -b native_posix from the tests directory. See tests/src/tests.c for examples.

Project roadmap

• Support for ECDH key agreement algorithms
• Support for countersignatures
• Support for NSA Suite B algorithms listed in RFC 6460
• Full coverage of COSE specfication described in RFC 8152