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mbedtls/docs/proposed/psa-driver-integration-guide.md
Manuel Pégourié-Gonnard de24ba6cfd Add link to examples in relevant places 
Some documents about driver describe a state of things that is ahead of
the reality. They already contain a warning about it, but no way to know
that the current reality is; add a pointer to a document that describes
it.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
2023-08-07 11:36:14 +02:00

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Building Mbed TLS with PSA cryptoprocessor drivers

This is a specification of work in progress. The implementation is not yet merged into Mbed TLS. For a description of the current state of drivers Mbed TLS, see our PSA Cryptoprocessor driver development examples.

This document describes how to build Mbed TLS with additional cryptoprocessor drivers that follow the PSA cryptoprocessor driver interface.

The interface is not fully implemented in Mbed TLS yet. Please note that the interface may still change: until further notice, we do not guarantee backward compatibility with existing driver code.

Introduction

The PSA cryptography driver interface provides a way to build Mbed TLS with additional code that implements certain cryptographic primitives. This is primarily intended to support platform-specific hardware.

Note that such drivers are only available through the PSA cryptography API (crypto functions beginning with psa_, and X.509 and TLS interfaces that reference PSA types).

Concretely speaking, a driver consists of one or more driver description files in JSON format and some code to include in the build. The driver code can either be provided in binary form as additional object file to link, or in source form.

How to build Mbed TLS with drivers

To build Mbed TLS with drivers:

  1. Pass the driver description files through the Make variable PSA_DRIVERS when building the library.

    cd /path/to/mbedtls
make PSA_DRIVERS="/path/to/acme/driver.json /path/to/nadir/driver.json" lib

  2. Link your application with the implementation of the driver functions.

    cd /path/to/application
ld myapp.o -L/path/to/acme -lacmedriver -L/path/to/nadir -lnadirdriver -L/path/to/mbedtls -lmbedcrypto