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Clarify how the headers are used

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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Gilles Peskine 2020-08-06 20:58:54 +02:00
parent e72e4de070
commit 53ba94c968
1 changed files with 2 additions and 2 deletions
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docs/proposed/psa-driver-interface.md
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@ -5,7 +5,7 @@ This document describes an interface for cryptoprocessor drivers in the PSA cryp
This specification is work in progress and should be considered to be in a beta stage. There is ongoing work to implement this interface in Mbed TLS, which is the reference implementation of the PSA Cryptography API. At this stage, Arm does not expect major changes, but minor changes are expected based on experience from the first implementation and on external feedback. This specification is work in progress and should be considered to be in a beta stage. There is ongoing work to implement this interface in Mbed TLS, which is the reference implementation of the PSA Cryptography API. At this stage, Arm does not expect major changes, but minor changes are expected based on experience from the first implementation and on external feedback.
Time-stamp: "2020/08/06 18:56:39 GMT" Time-stamp: "2020/08/06 18:58:29 GMT"
## Introduction ## Introduction
@ -70,7 +70,7 @@ A driver description is a JSON object containing the following properties:
* `"prefix"` (mandatory, string). This must be a valid prefix for a C identifier. All the types and functions provided by the driver have a name that starts with this prefix unless overridden with a `"name"` element in the applicable capability as described below. * `"prefix"` (mandatory, string). This must be a valid prefix for a C identifier. All the types and functions provided by the driver have a name that starts with this prefix unless overridden with a `"name"` element in the applicable capability as described below.
* `"type"` (mandatory, string). One of `"transparent"` or `"opaque"`. * `"type"` (mandatory, string). One of `"transparent"` or `"opaque"`.
* `"headers"` (optional, array of strings). A list of header files. These header files must define the types, macros and constants referenced by the driver description. They may declare the entry point functions, but this is not required. They may include other PSA headers and standard headers of the platform. Whether they may include other headers is implementation-specific. If omitted, the list of headers is empty. * `"headers"` (optional, array of strings). A list of header files. These header files must define the types, macros and constants referenced by the driver description. They may declare the entry point functions, but this is not required. They may include other PSA headers and standard headers of the platform. Whether they may include other headers is implementation-specific. If omitted, the list of headers is empty. The header files must be present at the specified location relative to a directory on the compiler's include path when compiling glue code between the core and the drivers.
* `"capabilities"` (mandatory, array of [capabilities](#driver-description-capability)). * `"capabilities"` (mandatory, array of [capabilities](#driver-description-capability)).
A list of **capabilities**. Each capability describes a family of functions that the driver implements for a certain class of cryptographic mechanisms. A list of **capabilities**. Each capability describes a family of functions that the driver implements for a certain class of cryptographic mechanisms.
* `"key_context"` (not permitted for transparent drivers, mandatory for opaque drivers): information about the [representation of keys](#key-format-for-opaque-drivers). * `"key_context"` (not permitted for transparent drivers, mandatory for opaque drivers): information about the [representation of keys](#key-format-for-opaque-drivers).