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Update and document mbedtls extensions

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Signed-off-by: Archana <archana.madhavan@silabs.com>
Signed-off-by: Asfandyar Orakzai <asfandyar.orakzai@silabs.com>
This commit is contained in:
Archana 2022-04-14 09:31:28 +05:30 committed by Asfandyar Orakzai
parent 1776dd9022
commit a2cac3224d
8 changed files with 21 additions and 15 deletions
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6
docs/proposed/psa-driver-developer-guide.md
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@ -36,6 +36,12 @@ A driver therefore consists of:
Mbed TLS calls driver entry points [as specified in the PSA Cryptography Driver Interface specification](psa-driver-interface.html#driver-entry-points) except as otherwise indicated in this section.
## Mbed TLS extensions
The driver description can include Mbed TLS extensions (marked by the namespace "mbedtls"). Mbed TLS extensions are meant to extend/help integrating the driver into the library's infrastructure.
* `"mbedtls/h_condition"` (optional, string) can include complex preprocessor definitions to conditionally include header files for a given driver.
* `"mbedtls/c_condition"` (optional, string) can include complex preprocessor definitions to conditionally enable dispatch capabilities for a driver.
## Building and testing your driver
<!-- TODO -->

4
scripts/data_files/driver_jsons/driver_opaque_schema.json
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@ -17,7 +17,7 @@
"type": ["integer","string"],
"pattern": "^(0x|0X)?[a-fA-F0-9]+$"
},
"mbedtls/h_depend_on": {
"mbedtls/h_condition": {
"type": "string"
},
"headers": {
@ -36,7 +36,7 @@
"_comment": {
"type": "string"
},
"mbedtls/c_depend_on": {
"mbedtls/c_condition": {
"type": "string"
},
"entry_points": {

4
scripts/data_files/driver_jsons/driver_transparent_schema.json
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@ -13,7 +13,7 @@
"type": "string",
"const": ["transparent"]
},
"mbedtls/h_depend_on": {
"mbedtls/h_condition": {
"type": "string"
},
"headers": {
@ -32,7 +32,7 @@
"_comment": {
"type": "string"
},
"mbedtls/c_depend_on": {
"mbedtls/c_condition": {
"type": "string"
},
"entry_points": {

6
scripts/data_files/driver_jsons/mbedtls_test_opaque_driver.json
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@ -2,17 +2,17 @@
"prefix": "mbedtls_test",
"type": "opaque",
"location": "0x7fffff",
"mbedtls/h_depend_on": "defined(PSA_CRYPTO_DRIVER_TEST)",
"mbedtls/h_condition": "defined(PSA_CRYPTO_DRIVER_TEST)",
"headers": ["test/drivers/test_driver.h"],
"capabilities": [
{
"_comment": "The Mbed TLS opaque driver supports import key/export key/export_public key",
"mbedtls/c_depend_on": "defined(PSA_CRYPTO_DRIVER_TEST)",
"mbedtls/c_condition": "defined(PSA_CRYPTO_DRIVER_TEST)",
"entry_points": ["import_key", "export_key", "export_public_key"]
},
{
"_comment": "The Mbed TLS opaque driver supports copy key/ get builtin key",
"mbedtls/c_depend_on": "defined(PSA_CRYPTO_DRIVER_TEST)",
"mbedtls/c_condition": "defined(PSA_CRYPTO_DRIVER_TEST)",
"entry_points": ["copy_key", "get_builtin_key"],
"names": {"copy_key":"mbedtls_test_opaque_copy_key", "get_builtin_key":"mbedtls_test_opaque_get_builtin_key"}
}

6
scripts/data_files/driver_jsons/mbedtls_test_transparent_driver.json
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@ -1,18 +1,18 @@
{
"prefix": "mbedtls_test",
"type": "transparent",
"mbedtls/h_depend_on": "defined(PSA_CRYPTO_DRIVER_TEST)",
"mbedtls/h_condition": "defined(PSA_CRYPTO_DRIVER_TEST)",
"headers": ["test/drivers/test_driver.h"],
"capabilities": [
{
"_comment": "The Mbed TLS transparent driver supports import key/export key",
"mbedtls/c_depend_on": "defined(PSA_CRYPTO_DRIVER_TEST)",
"mbedtls/c_condition": "defined(PSA_CRYPTO_DRIVER_TEST)",
"entry_points": ["import_key", "export_key"],
"fallback": true
},
{
"_comment": "The Mbed TLS transparent driver supports export_public key",
"mbedtls/c_depend_on": "defined(PSA_CRYPTO_DRIVER_TEST)",
"mbedtls/c_condition": "defined(PSA_CRYPTO_DRIVER_TEST)",
"entry_points": ["export_public_key"],
"fallback": true,
"names": {"export_public_key":"mbedtls_test_transparent_export_public_key"}

2
scripts/data_files/driver_templates/OS-template-opaque.jinja
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@ -7,7 +7,7 @@ Expected inputs:
-#}
{% for driver in drivers if driver.type == "opaque" -%}
{% for capability in driver.capabilities if entry_point in capability.entry_points -%}
#if ({% if capability['mbedtls/c_depend_on'] is defined -%}{{ capability['mbedtls/c_depend_on'] }} {% else -%} {{ 1 }} {% endif %})
#if ({% if capability['mbedtls/c_condition'] is defined -%}{{ capability['mbedtls/c_condition'] }} {% else -%} {{ 1 }} {% endif %})
{%- filter indent(width = nest_indent) %}
case {{ driver.location }}:
return( {{ entry_point_name(capability, entry_point, driver) }}({{entry_point_param(driver) | indent(20)}}));

2
scripts/data_files/driver_templates/OS-template-transparent.jinja
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@ -7,7 +7,7 @@ Expected inputs:
-#}
{% for driver in drivers if driver.type == "transparent" -%}
{% for capability in driver.capabilities if entry_point in capability.entry_points -%}
#if ({% if capability['mbedtls/c_depend_on'] is defined -%}{{ capability['mbedtls/c_depend_on'] }} {% else -%} {{ 1 }} {% endif %})
#if ({% if capability['mbedtls/c_condition'] is defined -%}{{ capability['mbedtls/c_condition'] }} {% else -%} {{ 1 }} {% endif %})
{%- filter indent(width = nest_indent) %}
status = {{ entry_point_name(capability, entry_point, driver) }}({{entry_point_param(driver) | indent(20)}});

6
scripts/data_files/driver_templates/psa_crypto_driver_wrappers.c.jinja
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@ -39,13 +39,13 @@
#if defined(MBEDTLS_PSA_CRYPTO_DRIVERS)
{% for driver in drivers -%}
/* Headers for {{driver.prefix}} {{driver.type}} driver */
{% if driver['mbedtls/h_depend_on'] is defined -%}
#if {{ driver['mbedtls/h_depend_on'] }}
{% if driver['mbedtls/h_condition'] is defined -%}
#if {{ driver['mbedtls/h_condition'] }}
{% endif -%}
{% for header in driver.headers -%}
#include "{{ header }}"
{% endfor %}
{% if driver['mbedtls/h_depend_on'] is defined -%}
{% if driver['mbedtls/h_condition'] is defined -%}
#endif
{% endif -%}
{% endfor %}