mbedtls/docs/proposed/psa-driver-interface.md

PSA Cryptoprocessor Driver Interface

This document describes an interface for cryptoprocessor drivers in the PSA cryptography API. This interface complements the PSA Cryptography API specification, which describes the interface between a PSA Cryptography implementation and an application.

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: "2020/08/05 20:18:29 GMT"

Introduction

Purpose of the driver interface

The PSA Cryptography API defines an interface that allows applications to perform cryptographic operations in a uniform way regardless of how the operations are performed. Under the hood, different keys may be processed in different hardware or in different logical partitions, and different algorithms may involve different hardware or software components.

The driver interface allows implementations of the PSA Crypytography API to be built compositionally. An implementation of the PSA Cryptography API is composed of a core and zero or more drivers. The core handles key management, enforces key usage policies, and dispatches cryptographic operations either to the applicable driver or to built-in code.

Functions in the PSA Cryptography API invoke functions in the core. Code from the core calls drivers as described in the present document.

Types of drivers

The PSA Cryptography driver interface supports two types of cryptoprocessors, and accordingly two types of drivers.

• Transparent drivers implement cryptographic operations on keys that are provided in cleartext at the beginning of each operation. They are typically used for hardware accelerators. When a transparent driver is available for a particular combination of parameters (cryptographic algorithm, key type and size, etc.), it is used instead of the default software implementation. Transparent drivers can also be pure software implementations that are distributed as plug-ins to a PSA Crypto implementation.
• Opaque drivers implement cryptographic operations on keys that can only be used inside a protected environment such as a secure element, a hardware security module, a smartcard, a secure enclave, etc. An opaque driver is invoked for the specific key location that the driver is registered for: the dispatch is based on the key's lifetime.

Requirements

The present specification was designed to fulfil the following high-level requirements.

[Req.plugins] It is possible to combine multiple drivers from different providers into the same implementation, without any prior arrangement other than choosing certain names and values from disjoint namespaces.

[Req.compile] It is possible to compile the code of each driver and of the core separately, and link them together. A small amount of glue code may need to be compiled once the list of drivers is available.

[Req.types] Support drivers for the following types of hardware: accelerators that operate on keys in cleartext; cryptoprocessors that can wrap keys with a built-in keys but not store user keys; and cryptoprocessors that store key material.

[Req.portable] The interface between drivers and the core does not involve any platform-specific consideration. Driver calls are simple C functions. Interactions between driver code and hardware happen inside the driver (and in fact a driver need not involve any hardware at all).

[Req.location] Applications can tell which location values correspond to which secure element drivers.

[Req.fallback] Accelerator drivers can specify that they do not fully support a cryptographic mechanism and that a fallback to core code may be necessary. Conversely, if an accelerator fully supports cryptographic mechanism, the core does not need to include code for this mechanism.

[Req.mechanisms] Drivers can specify which mechanisms they support. A driver's code will not be invoked for cryptographic mechanisms that it does not support.

Overview of drivers

Deliverables for a driver

To write a driver, you need to implement some functions with C linkage, and to declare these functions in a driver description file. The driver description file declares which functions the driver implements and what cryptographic mechanisms they support. Depending on the driver type, you may also need to define some C types and macros in a header file.

The concrete syntax for a driver description file is JSON. The structure of this JSON file is specified in the section “Driver description syntax”.

A driver therefore consists of:

• A driver description file (in JSON format).
• C header files defining the types required by the driver description. The names of these header files is declared in the driver description file.
• An object file compiled for the target platform defining the functions required by the driver description. Implementations may allow drivers to be provided as source files and compiled with the core instead of being pre-compiled.

How to provide the driver description file, the C header files and the object code is implementation-dependent.

Implementations should support multiple drivers.

Driver description syntax

The concrete syntax for a driver description file is JSON.

Driver description top-level element

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.
• "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 provided by the driver and may declare the functions provided by the driver. 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.
• "capabilities" (mandatory, array of capabilities). 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.
• "persistent_state_size" (not permitted for transparent drivers, optional for opaque drivers, integer or string). The size in bytes of the persistent state of the driver. This may be either a non-negative integer or a C constant expression of type size_t.
• "location" (not permitted for transparent drivers, optional for opaque drivers, integer or string). The location value for which this driver is invoked. In other words, this determines the lifetimes for which the driver is invoked. This may be either a non-negative integer or a C constant expression of type psa_key_location_t.

Driver description capability

A capability declares a family of functions that the driver implements for a certain class of cryptographic mechanisms. The capability specifies which key types and algorithms are covered and the names of the types and functions that implement it.

A capability is a JSON object containing the following properties:

• "functions" (optional, list of strings). Each element is the name of a driver function or driver function family. If specified, the core will invoke this capability of the driver only when performing one of the specified operations. If omitted, the "algorithms" property is mandatory and the core will invoke this capability of the driver for all operations that are applicable to the specified algorithms. The driver must implement all the specified or implied functions, as well as the types if applicable.
• "algorithms" (optional, list of strings). Each element is an algorithm specification. If specified, the core will invoke this capability of the driver only when performing one of the specified algorithms. If omitted, the core will invoke this capability for all applicable algorithms.
• "key_types" (optional, list of strings). Each element is a key type specification. If specified, the core will invoke this capability of the driver only for operations involving a key with one of the specified key types. If omitted, the core will invoke this capability of the driver for all applicable key types.
• "key_sizes" (optional, list of integers). If specified, the core will invoke this capability of the driver only for operations involving a key with one of the specified key sizes. If omitted, the core will invoke this capability of the driver for all applicable key sizes. Key sizes are expressed in bits.
• "names" (optional, object). A mapping from function names described by the "functions" property, to the name of the C function in the driver that implements the corresponding function. If a function is not listed here, name of the driver function that implements it is the driver's prefix followed by an underscore (_) followed by the function name. If this property is omitted, it is equivalent to an empty object (so each function suffix is implemented by a function with called prefix_suffix).
• "fallback" (optional for transparent drivers, not permitted for opaque drivers, boolean). If present and true, the driver may return PSA_ERROR_NOT_SUPPORTED, in which case the core should call another driver or use built-in code to perform this operation. If absent or false, the core should not include built-in code to perform this particular cryptographic mechanism.

Example: the following capability declares that the driver can perform deterministic ECDSA signatures using SHA-256 or SHA-384 with a SECP256R1 or SECP384R1 private key (with either hash being possible in combination with either curve). If the prefix of this driver is "acme", the function that performs the signature is called acme_sign_hash.

{
    "functions": ["sign_hash"],
    "algorithms": ["PSA_ALG_DETERMINISTIC_ECDSA(PSA_ALG_SHA_256)",
                   "PSA_ALG_DETERMINISTIC_ECDSA(PSA_ALG_SHA_384)"],
    "key_types": ["PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_CURVE_SECP_R1)"],
    "key_sizes": [256, 384]
}

Algorithm and key specifications

Algorithm specifications

An algorithm specification is a string consisting of a PSA_ALG_xxx macro that specifies a cryptographic algorithm defined by the PSA Cryptography API. If the macro takes arguments, the string must have the syntax of a C macro call and each argument must be an algorithm specification or a decimal or hexadecimal literal with no suffix, depending on the expected type of argument.

Spaces are optional after commas. Whether other whitespace is permitted is implementation-specific.

Valid examples:

PSA_ALG_SHA_256
PSA_ALG_HMAC(PSA_ALG_SHA_256)
PSA_ALG_KEY_AGREEMENT(PSA_ALG_ECDH, PSA_ALG_HKDF(PSA_ALG_SHA_256))

Key type specifications

An algorithm specification is a string consisting of a PSA_KEY_TYPE_xxx macro that specifies a key type defined by the PSA Cryptography API. If the macro takes an argument, the string must have the syntax of a C macro call and each argument must be the name of a constant of suitable type (curve or group).

The name _ may be used instead of a curve or group to indicate that the capability concerns all curves or groups.

Valid examples:

PSA_KEY_TYPE_AES
PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_CURVE_SECP_R1)
PSA_KEY_TYPE_ECC_KEY_PAIR(_)

Driver entry points

Overview of driver entry points

Drivers define functions, each of which implements an aspect of a capability of a driver, such as a cryptographic operation, a part of a cryptographic operation, or a key management action. These functions are called the entry points of the driver. Most driver entry points correspond to a particular function in the PSA Cryptography API. For example, if a call to psa_sign_hash() is dispatched to a driver, it invokes the driver's sign_hash function.

All driver entry points return a status of type psa_status_t which should use the status codes documented for PSA services in general and for PSA Crypto in particular: PSA_SUCCESS indicates that the function succeeded, and PSA_ERROR_xxx values indicate that an error occurred.

The signature of a driver entry point generally looks like the signature of the PSA Crypto API that it implements, with some modifications. This section gives an overview of modifications that apply to whole classes of entry points. Refer to the reference section for each entry point or entry point family for details.

• For entry points that operate on an existing key, the psa_key_id_t parameter is replaced by a sequence of three parameters that describe the key:

  1. const psa_key_attributes_t *attributes: the key attributes.
  2. const uint8_t *key_buffer: a key material or key context buffer.
  3. size_t key_buffer_size: the size of the key buffer in bytes.

  For transparent drivers, the key buffer contains the key material, in the same format as defined for psa_export_key() and psa_export_public_key() in the PSA Cryptography API. For opaque drivers, the content of the key buffer is entirely up to the driver.

• For entry points that involve a multi-part operation, the operation state type (psa_XXX_operation_t) is replaced by a driver-specific operation state type (prefix_XXX_operation_t).

Some entry points are grouped in families that must be implemented as a whole. If a driver supports a entry point family, it must provide all the entry points in the family.

General considerations on driver entry point parameters

Buffer parameters for driver entry points obey the following conventions:

• An input buffer has the type const uint8_t * and is immediately followed by a parameter of type size_t that indicates the buffer size.
• An output buffer has the type uint8_t * and is immediately followed by a parameter of type size_t that indicates the buffer size. A third parameter of type size_t * is provided to report the actual buffer size if the function succeeds.
• An in-out buffer has the type uint8_t * and is immediately followed by a parameter of type size_t that indicates the buffer size. Note that the buffer size does not change.

Buffers of size 0 may be represented with either a null pointer or a non-null pointer.

Input buffers and other input-only parameters (const pointers) may be in read-only memory. Overlap is possible between input buffers, and between an input buffer and an output buffer, but not between two output buffers or between a non-buffer parameter and another parameter.

Driver entry points for single-part cryptographic operations

The following driver entry points perform a cryptographic operation in one shot (single-part operation):

• "hash_compute" (transparent drivers only): calculation of a hash. Called by psa_hash_compute() and psa_hash_compare(). To verify a hash with psa_hash_compare(), the core calls the driver's "hash_compute" entry point and compares the result with the reference hash value.
• "mac_compute": calculation of a MAC. Called by psa_mac_compute() and possibly psa_mac_verify(). To verify a mac with psa_mac_verify(), the core calls an applicable driver's "mac_verify" entry point if there is one, otherwise the core calls an applicable driver's "mac_compute" entry point and compares the result with the reference MAC value.
• "mac_verify": verification of a MAC. Called by psa_mac_verify(). This entry point is mainly useful for drivers of secure elements that verify a MAC without revealing the correct MAC. Although transparent drivers may implement this entry point in addition to "mac_compute", it is generally not useful because the core can call the "mac_compute" entry point and compare with the expected MAC value.
• "cipher_encrypt": unauthenticated symmetric cipher encryption. Called by psa_cipher_encrypt().
• "cipher_decrypt": unauthenticated symmetric cipher decryption. Called by psa_cipher_decrypt().
• "aead_encrypt": authenticated encryption with associated data. Called by psa_aead_encrypt().
• "aead_decrypt": authenticated decryption with associated data. Called by psa_aead_decrypt().
• "asymmetric_encrypt": asymmetric encryption. Called by psa_asymmetric_encrypt().
• "asymmetric_decrypt": asymmetric decryption. Called by psa_asymmetric_decrypt().
• "sign_hash": signature of an already calculated hash. Called by psa_sign_hash() and possibly psa_sign_message(). To sign a message with psa_sign_message(), the core calls an applicable driver's "sign_message" entry point if there is one, otherwise the core calls an applicable driver's "hash_compute" entry point followed by an applicable driver's "sign_hash" entry point.
• "verify_hash": verification of an already calculated hash. Called by psa_verify_hash() and possibly psa_verify_message(). To verify a message with psa_verify_message(), the core calls an applicable driver's "verify_message" entry point if there is one, otherwise the core calls an applicable driver's "hash_compute" entry point followed by an applicable driver's "verify_hash" entry point.
• "sign_message": signature of a message. Called by psa_sign_message().
• "verify_message": verification of a message. Called by psa_verify_message().
• "key_agreement": key agreement without a subsequent key derivation. Called by psa_raw_key_agreement() and possibly psa_key_derivation_key_agreement().

Driver entry points for multi-part operations

General considerations on multi-part operations

The entry points that implement each step of a multi-part operation are grouped into a family. A driver that implements a multi-part operation must define all of the entry points in this family as well as a type that represents the operation context. The lifecycle of a driver operation context is similar to the lifecycle of an API operation context:

1. The core initializes operation context objects to either all-bits-zero or to logical zero ({0}), at its discretion.
2. The core calls the xxx_setup entry point for this operation family. If this fails, the core destroys the operation context object without calling any other driver entry point on it.
3. The core calls other entry points that manipulate the operation context object, respecting the constraints.
4. If any entry point fails, the core calls the driver's xxx_abort entry point for this operation family, then destroys the operation context object without calling any other driver entry point on it.
5. If a “finish” entry point fails, the core destroys the operation context object without calling any other driver entry point on it. The finish entry points are: prefix_mac_sign_finish, prefix_mac_verify_finish, prefix_cipher_fnish, prefix_aead_finish, prefix_aead_verify.

If a driver implements a multi-part operation but not the corresponding single-part operation, the core calls the driver's multipart operation entry points to perform the single-part operation.

Multi-part operation entry point family "hash_multipart"

This family corresponds to the calculation of a hash in multiple steps.

This family applies to transparent drivers only.

This family requires the following type and functions:

• Type "hash_operation_t": the type of a hash operation context. It must be possible to copy a hash operation context byte by byte, therefore hash operation contexts must not contain any embedded pointers (except pointers to global data that do not change after the setup step).
• "hash_setup": called by psa_hash_setup().
• "hash_update": called by psa_hash_update().
• "hash_finish": called by psa_hash_finish() and psa_hash_verify().
• "hash_abort": called by all multi-part hash functions.

To verify a hash with psa_hash_verify(), the core calls the driver's *prefix_hash_finish entry point and compares the result with the reference hash value.

For example, a driver with the prefix "acme" that implements the "hash_multipart" entry point family must define the following type and entry points (assuming that the capability does not use the "names" property to declare different type and entry point names):

typedef ... acme_hash_operation_t;
psa_status_t acme_hash_setup(acme_hash_operation_t *operation,
                             psa_algorithm_t alg);
psa_status_t acme_hash_update(acme_hash_operation_t *operation,
                              const uint8_t *input,
                              size_t input_length);
psa_status_t acme_hash_finish(acme_hash_operation_t *operation,
                              uint8_t *hash,
                              size_t hash_size,
                              size_t *hash_length);
psa_status_t acme_hash_abort(acme_hash_operation_t *operation);

Operation family "mac_multipart"

TODO

Operation family "mac_verify_multipart"

TODO

Operation family "cipher_encrypt_multipart"

TODO

Operation family "cipher_decrypt_multipart"

TODO

Operation family "aead_encrypt_multipart"

TODO

Operation family "aead_decrypt_multipart"

TODO

Operation family "key_derivation"

This family requires the following type and entry points:

• Type "key_derivation_operation_t": the type of a key derivation operation context.
• "key_derivation_setup": called by psa_key_derivation_setup().
• "key_derivation_set_capacity": called by psa_key_derivation_set_capacity(). The core will always enforce the capacity, therefore this function does not need to do anything for algorithms where the output stream only depends on the effective generated length and not on the capacity.
• "key_derivation_input_bytes": called by psa_key_derivation_input_bytes() and psa_key_derivation_input_key(). For transparent drivers, when processing a call to psa_key_derivation_input_key(), the core always calls the applicable driver's "key_derivation_input_bytes" entry point.
• "key_derivation_input_key" (opaque drivers only)
• "key_derivation_output_bytes": called by psa_key_derivation_output_bytes(); also by psa_key_derivation_output_key() for transparent drivers.
• "key_derivation_abort": called by all key derivation functions.

TODO: key input and output for opaque drivers; deterministic key generation for transparent drivers

TODO

Driver entry points for key management

The driver entry points for key management differs significantly between transparent drivers and opaque drivers. Refer to the applicable section for each driver type.

Miscellaneous driver entry points

Driver initialization

A driver may declare an "init" entry point in a capability with no algorithm, key type or key size. If so, the driver calls this entry point once during the initialization of the PSA Crypto subsystem. If the init entry point of any driver fails, the initialization of the PSA Crypto subsystem fails.

When multiple drivers have an init entry point, the order in which they are called is unspecified. It is also unspecified whether other drivers' init functions are called if one or more init function fails.

On platforms where the PSA Crypto implementation is a subsystem of a single application, the initialization of the PSA Crypto subsystem takes place during the call to psa_crypto_init(). On platforms where the PSA Crypto implementation is separate from the application or applications, the initialization the initialization of the PSA Crypto subsystem takes place before or during the first time an application calls psa_crypto_init().

The init function does not take any parameter.

Combining multiple drivers

To declare a cryptoprocessor can handle both cleartext and plaintext keys, you need to provide two driver descriptions, one for a transparent driver and one for an opaque driver. You can use the mapping in capabilities' "names" property to arrange for multiple driver entry points to map to the same C function.

Transparent drivers

Key format for transparent drivers

The format of a key for transparent drivers is the same as in applications. Refer to the documentation of psa_export_key() and psa_export_public_key().

Key management with transparent drivers

Transparent drivers may provide the following key management entry points:

• "generate_key": called by psa_generate_key(), only when generating a key pair (key such that PSA_KEY_TYPE_IS_ASYMMETRIC is true).
• "derive_key": called by psa_key_derivation_output_key(), only when deriving a key pair (key such that PSA_KEY_TYPE_IS_ASYMMETRIC is true).
• "export_public_key": called by the core to obtain the public key of a key pair. The core may call this function at any time to obtain the public key, which can be for psa_export_public_key() but also at other times, including during a cryptographic operation that requires the public key such as a call to psa_verify_message() on a key pair object.

Transparent drivers are not involved when importing, exporting, copying or destroying keys, or when generating or deriving symmetric keys.

Fallback

If a transparent driver entry point is part of a capability which has a true "fallback" property and returns PSA_ERROR_NOT_SUPPORTED, the built-in software implementation will be called instead. Any other value (PSA_SUCCESS or a different error code) is returned to the application.

If there are multiple available transparent drivers, the core tries them in turn until one is declared without a true "fallback" property or returns a status other than PSA_ERROR_NOT_SUPPORTED.

If a transparent driver entry point is part of a capability where the "fallback" property is false or omitted, the core should not include any other code for this capability, whether built in or in another transparent driver.

Opaque drivers

Opaque drivers allow a PSA Cryptography implementation to delegate cryptographic operations to a separate environment that might not allow exporting key material in cleartext. The opaque driver interface is designed so that the core never inspects the representation of a key. The opaque driver interface is designed to support two subtypes of cryptoprocessors:

• Some cryptoprocessors do not have persistent storage for individual keys. The representation of a key is the key material wrapped with a master key which is located in the cryptoprocessor and never exported from it. The core stores this wrapped key material on behalf of the cryptoprocessor.
• Some cryptoprocessors have persistent storage for individual keys. The representation of a key is an identifier such as label or slot number. The core stores this identifier.

Key format for opaque drivers

The format of a key for opaque drivers is an opaque blob. The content of this blob is fully up to the driver. The core merely stores this blob.

Note that since the core stores the key context blob as it is in memory, it must only contain data that is meaningful after a reboot. In particular, it must not contain any pointers or transient handles.

The "key_context" property in the driver description specifies how to calculate the size of the key context as a function of the key type and size. This is an object with the following properties:

• "base_size" (integer or string, optional): this many bytes are included in every key context. If omitted, this value defaults to 0.
• "key_pair_size" (integer or string, optional): this many bytes are included in every key context for a key pair. If omitted, this value defaults to 0.
• "public_key_size" (integer or string, optional): this many bytes are included in every key context for a public key. If omitted, this value defaults to 0.
• "symmetric_factor" (integer or string, optional): every key context for a symmetric key includes this many times the key size. If omitted, this value defaults to 0.
• "store_public_key" (boolean, optional): If specified and true, for a key pair, the key context includes space for the public key. If omitted or false, no additional space is added for the public key.
• "size_function" (string, optional): the name of a function that returns the number of bytes that the driver needs in a key context for a key. This may be a pointer to function. This must be a C identifier; more complex expressions are not permitted. If the core uses this function, it supersedes all the other properties.

The integer properties must be C language constants. A typical value for "base_size" is sizeof(acme_key_context_t) where acme_key_context_t is a type defined in a driver header file.

Size of a dynamically allocated key context

If the core supports dynamic allocation for the key context and chooses to use it, and the driver specification includes the "size_function" property, the size of the key context is at least

size_function(key_type, key_bits)

where size_function is the function named in the "size_function" property, key_type is the key type and key_bits is the key size in bits. The prototype of the size function is

size_t size_function(psa_key_type_t key_type, size_t key_bits);

Size of a statically allocated key context

If the core does not support dynamic allocation for the key context or chooses not to use it, or if the driver specification does not include the "size_function" property, the size of the key context for a key of type key_type and of size key_bits bits is:

• For a key pair (PSA_KEY_TYPE_IS_KEY_PAIR(key_type) is true):

  base_size + key_pair_size + public_key_overhead
  

  where public_key_overhead = PSA_EXPORT_PUBLIC_KEY_MAX_SIZE(key_type, key_bits) if the "store_public_key" property is true and public_key_overhead = 0 otherwise.

• For a public key (PSA_KEY_TYPE_IS_PUBLIC_KEY(key_type) is true):

  base_size + public_key_size
  

• For a symmetric key (not a key pair or public key):

  base_size + symmetric_factor * key_bytes
  

  where key_bytes = ((key_bits + 7) / 8) is the key size in bytes.

Key context size for a secure element with storage

If the key is stored in the secure element and the driver only needs to store a label for the key, use "base_size" as the size of the label plus any other metadata that the driver needs to store, and omit the other properties.

If the key is stored in the secure element, but the secure element does not store the public part of a key pair and cannot recompute it on demand, additionally use the "store_public_key" property with the value true. Note that this only influences the size of the key context: the driver code must copy the public key to the key context and retrieve it on demand in its export_public_key entry point.

Key context size for a secure element without storage

If the key is stored in wrapped form outside the secure element, and the wrapped form of the key plus any metadata has up to N bytes of overhead, use N as the value of the "base_size" property and set the "symmetric_factor" property to 1. Set the "key_pair_size" and "public_key_size" properties appropriately for the largest supported key pair and the largest supported public key respectively.

Key management with opaque drivers

Transparent drivers may provide the following key management entry points:

• "export_key": called by psa_export_key(), or by psa_copy_key() when copying a key from or to a different location.
• "export_public_key": called by the core to obtain the public key of a key pair. The core may call this entry point at any time to obtain the public key, which can be for psa_export_public_key() but also at other times, including during a cryptographic operation that requires the public key such as a call to psa_verify_message() on a key pair object.
• "import_key": called by psa_import_key(), or by psa_copy_key() when copying a key from another location.
• "generate_key": called by psa_generate_key().
• "derive_key": called by psa_key_derivation_output_key().
• "copy_key": called by psa_copy_key() when copying a key within the same location.

In addition, secure elements that store the key material internally must provide the following two entry points:

• "allocate_key": called by psa_import_key(), psa_generate_key(), psa_key_derivation_output_key() or psa_copy_key() before creating a key in the location of this driver.
• "destroy_key": called by psa_destroy_key().

Key creation in a secure element without storage

This section describes the key creation process for secure elements that do not store the key material. The driver must obtain a wrapped form of the key material which the core will store. A driver for such a secure element has no "allocate_key" or "destroy_key" entry point.

When creating a key with an opaque driver which does not have an "allocate_key" or "destroy_key" entry point:

1. The core allocates memory for the key context.
2. The core calls the driver's import, generate, derive or copy function.
3. The core saves the resulting wrapped key material and any other data that the key context may contain.

To destroy a key, the core simply destroys the wrapped key material, without invoking driver code.

Key management in a secure element with storage

This section describes the key creation and key destruction processes for secure elements that have persistent storage for the key material. A driver for such a secure element has two mandatory entry points:

• "allocate_key": this function obtains an internal identifier for the key. This may be, for example, a unique label or a slot number.
• "destroy_key": this function invalidates the internal identifier and destroys the associated key material.

These functions have the following prototypes:

psa_status_t acme_allocate_key(const psa_key_attributes_t *attributes,
                               uint8_t *key_buffer,
                               size_t key_buffer_size);
psa_status_t acme_destroy_key(const psa_key_attributes_t *attributes,
                              const uint8_t *key_buffer,
                              size_t key_buffer_size);

When creating a persistent key with an opaque driver which has an "allocate_key" entry point:

1. The core calls the driver's "allocate_key" entry point. This function typically allocates an internal identifier for the key without modifying the state of the secure element and stores the identifier in the key context. This function should not modify the state of the secure element. It may modify the copy of the persistent state of the driver in memory.

2. The core saves the key context to persistent storage.

3. The core calls the driver's key creation entry point.

4. The core saves the updated key context to persistent storage.

If a failure occurs after the "allocate_key" step but before the call to the second driver entry point, the core will do one of the following:

• Fail the creation of the key without indicating this to the driver. This can happen, in particular, if the device loses power immediately after the key allocation entry point returns.
• Call the driver's "destroy_key" entry point.

To destroy a key, the core calls the driver's "destroy_key" entry point.

Note that the key allocation and destruction entry point must not rely solely on the key identifier in the key attributes to identify a key. Some implementations of the PSA Crypto API store keys on behalf of multiple clients, and different clients may use the same key identifier to designate different keys. The manner in which the core distinguishes keys that have the same identifier but are part of the key namespace for different clients is implementation-dependent and is not accessible to drivers. Some typical strategies to allocate an internal key identifier are:

• Maintain a set of free slot numbers which is stored either in the secure element or in the driver's persistent storage. To allocate a key slot, find a free slot number, mark it as occupied and store the number in the key context. When the key is destroyed, mark the slot number as free.
• Maintain a monotonic counter with a practically unbounded range in the secure element or in the driver's persistent storage. To allocate a key slot, increment the counter and store the current value in the key context. Destroying a key does not change the counter.

TODO: explain constraints on how the driver updates its persistent state for resilience

TODO: some of the above doesn't apply to volatile keys

Key creation entry points in opaque drivers

The key creation entry points have the following prototypes:

psa_status_t acme_import_key(const psa_key_attributes_t *attributes,
                             const uint8_t *data,
                             size_t data_length,
                             uint8_t *key_buffer,
                             size_t key_buffer_size);
psa_status_t acme_generate_key(const psa_key_attributes_t *attributes,
                               uint8_t *key_buffer,
                               size_t key_buffer_size);

If the driver has an "allocate_key" entry point, the core calls the "allocate_key" entry point with the same attributes on the same key buffer before calling the key creation function.

TODO: derivation, copy

Key export entry points in opaque drivers

The key export entry points have the following prototypes:

psa_status_t acme_export_key(const psa_key_attributes_t *attributes,
                             const uint8_t *key_buffer,
                             size_t key_buffer_size);
                             uint8_t *data,
                             size_t data_size,
                             size_t *data_length);
psa_status_t acme_export_public_key(const psa_key_attributes_t *attributes,
                                    const uint8_t *key_buffer,
                                    size_t key_buffer_size);
                                    uint8_t *data,
                                    size_t data_size,
                                    size_t *data_length);

The core will only call acme_export_public_key on a private key. Drivers implementers may choose to store the public key in the key context buffer or to recalculate it on demand. If the key context includes the public key, it needs to have an adequate size; see “Key format for opaque drivers”.

The core guarantees that the size of the output buffer (data_size) is sufficient to export any key with the given attributes. The driver must set *data_length to the exact size of the exported key.

Opaque driver persistent state

The core maintains persistent state on behalf of an opaque driver. This persistent state consists of a single byte array whose size is given by the "persistent_state_size" property in the driver description.

The core loads the persistent state in memory before it calls the driver's init entry point. It is adjusted to match the size declared by the driver, in case a driver upgrade changes the size:

• The first time the driver is loaded on a system, the persistent state is all-bits-zero.
• If the stored persistent state is smaller than the declared size, the core pads the persistent state with all-bits-zero at the end.
• If the stored persistent state is larger than the declared size, the core truncates the persistent state to the declared size.

The core provides the following callback functions, which an opaque driver may call while it is processing a call from the driver:

psa_status_t psa_crypto_driver_get_persistent_state(uint_8_t **persistent_state_ptr);
psa_status_t psa_crypto_driver_update_persistent_state(size_t from, size_t length);

psa_crypto_driver_get_persistent_state sets *persistent_state_ptr to a pointer to the first byte of the persistent state. This pointer remains valid during a call to a driver entry point. Once the entry point returns, the pointer is no longer valid. The core guarantees that calls to psa_crypto_driver_get_persistent_state within the same entry point return the same address for the persistent state, but this address may change between calls to an entry point.

psa_crypto_driver_update_persistent_state updates the persistent state in persistent storage. Only the portion at byte offsets from inclusive to from + length exclusive is guaranteed to be updated; it is unspecified whether changes made to other parts of the state are taken into account. The driver must call this function after updating the persistent state in memory and before returning from the entry point, otherwise it is unspecified whether the persistent state is updated.

In a multithreaded environment, the driver may only call these two functions from the thread that is executing the entry point.

How to use drivers from an application

Using transparent drivers

Transparent drivers linked into the library are automatically used for the mechanisms that they implement.

Using opaque drivers

Each opaque driver is assigned a location. The driver is invoked for all actions that use a key in that location. A key's location is indicated by its lifetime. The application chooses the key's lifetime when it creates the key.

For example, the following snippet creates an AES-GCM key which is only accessible inside a secure element.

psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_set_key_lifetime(&attributes, PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(
        PSA_KEY_PERSISTENCE_DEFAULT, PSA_KEY_LOCATION_acme));
psa_set_key_identifer(&attributes, 42);
psa_set_key_type(&attributes, PSA_KEY_TYPE_AES);
psa_set_key_size(&attributes, 128);
psa_set_key_algorithm(&attributes, PSA_ALG_GCM);
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT);
psa_key_handle_t handle = 0;
psa_generate_key(&attributes, &handle);

Using opaque drivers from an application

Lifetimes and locations

The PSA Cryptography API, version 1.0.0, defines lifetimes as an attribute of a key that indicates where the key is stored and which application and system actions will create and destroy it. The lifetime is expressed as a 32-bit value (typedef uint32_t psa_key_lifetime_t). An upcoming version of the PSA Cryptography API defines more structure for lifetime values to separate these two aspects of the lifetime:

• Bits 0–7 are a persistence level. This value indicates what device management actions can cause it to be destroyed. In particular, it indicates whether the key is volatile or persistent.
• Bits 8–31 are a location indicator. This value indicates where the key material is stored and where operations on the key are performed. Location values can be stored in a variable of type psa_key_location_t.

An opaque driver is attached to a specific location. Keys in the default location (PSA_KEY_LOCATION_LOCAL_STORAGE = 0) are transparent: the core has direct access to the key material. For keys in a location that is managed by an opaque driver, only the secure element has access to the key material and can perform operations on the key, while the core only manipulates a wrapped form of the key or an identifier of the key.

Creating a key in a secure element

The core defines a compile-time constant for each opaque driver indicating its location called PSA_KEY_LOCATION_prefix where prefix is the value of the "prefix" property in the driver description. For convenience, Mbed TLS also declares a compile-time constant for the corresponding lifetime with the default persistence called PSA_KEY_LIFETIME_prefix. Therefore, to declare an opaque key in the location with the prefix foo with the default persistence, call psa_set_key_lifetime during the key creation as follows:

psa_set_key_lifetime(&attributes, PSA_KEY_LIFETIME_foo);

To declare a volatile key:

psa_set_key_lifetime(&attributes, PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(
        PSA_KEY_LOCATION_foo,
        PSA_KEY_PERSISTENCE_VOLATILE));

Generally speaking, to declare a key with a specified persistence:

psa_set_key_lifetime(&attributes, PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(
        PSA_KEY_LOCATION_foo,
        persistence));

Open questions

Driver declarations

Declaring driver functions

The core may want to provide declarations for the driver functions so that it can compile code using them. At the time of writing this paragraph, the driver headers must define types but there is no obligation for them to declare functions. The core knows what the function names and argument types are, so it can generate prototypes.

It should be ok for driver functions to be function-like macros or function pointers.

Driver location values

How does a driver author decide which location values to use? It should be possible to combine drivers from different sources. Use the same vendor assignment as for PSA services?

Can the driver assembly process generate distinct location values as needed? This can be convenient, but it's also risky: if you upgrade a device, you need the location values to be the same between builds.

Driver function interfaces

Driver function parameter conventions

Should 0-size buffers be guaranteed to have a non-null pointers?

Should drivers really have to cope with overlap?

Should the core guarantee that the output buffer size has the size indicated by the applicable buffer size macro (which may be an overestimation)?

Partial computations in drivers

Substitution points

Earlier drafts of the driver interface had a concept of substitution points: places in the calculation where a driver may be called. Some hardware doesn't do the whole calculation, but only the “main” part. This goes both for transparent and opaque drivers. Some common examples:

• A processor that performs the RSA exponentiation, but not the padding. The driver should be able to leverage the padding code in the core.
• A processor that performs a block cipher operation only for a single block, or only in ECB mode, or only in CTR mode. The core would perform the block mode (CBC, CTR, CCM, ...).

This concept, or some other way to reuse portable code such as specifying inner functions like psa_rsa_pad in the core, should be added to the specification.

Key management

Mixing drivers in key derivation

How does psa_key_derivation_output_key work when the extraction part and the expansion part use different drivers?

Public key calculation

ECC key pairs are represented as the private key value only. The public key needs to be calculated from that. Both transparent drivers and opaque drivers provide a function to calculate the public key ("export_public_key").

The specification doesn't mention when the public key might be calculated. The core may calculate it on creation, on demand, or anything in between. Opaque drivers have a choice of storing the public key in the key context or calculating it on demand and can convey whether the core should store the public key with the "store_public_key" property. Is this good enough or should the specification include non-functional requirements?

Opaque drivers

Opaque driver persistent state

The driver is allowed to update the state at any time. Is this ok?

An example use case for updating the persistent state at arbitrary times is to renew a key that is used to encrypt communications between the application processor and the secure element.

psa_crypto_driver_get_persistent_state does not identify the calling driver, so the driver needs to remember which driver it's calling. This may require a thread-local variable in a multithreaded core. Is this ok?