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969 lines
46 KiB
C
969 lines
46 KiB
C
/**
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* \file psa/crypto_se_driver.h
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* \brief PSA external cryptoprocessor driver module
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*
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* This header declares types and function signatures for cryptography
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* drivers that access key material via opaque references.
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* This is meant for cryptoprocessors that have a separate key storage from the
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* space in which the PSA Crypto implementation runs, typically secure
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* elements (SEs).
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*
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* This file is part of the PSA Crypto Driver Model, containing functions for
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* driver developers to implement to enable hardware to be called in a
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* standardized way by a PSA Cryptographic API implementation. The functions
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* comprising the driver model, which driver authors implement, are not
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* intended to be called by application developers.
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*/
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/*
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* Copyright (C) 2018, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef PSA_CRYPTO_SE_DRIVER_H
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#define PSA_CRYPTO_SE_DRIVER_H
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#include "crypto_driver_common.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** An internal designation of a key slot between the core part of the
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* PSA Crypto implementation and the driver. The meaning of this value
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* is driver-dependent. */
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typedef uint32_t psa_key_slot_number_t; // Change this to psa_key_slot_t after psa_key_slot_t is removed from Mbed crypto
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/** \defgroup se_mac Secure Element Message Authentication Codes
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* Generation and authentication of Message Authentication Codes (MACs) using
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* a secure element can be done either as a single function call (via the
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* `psa_drv_se_mac_generate_t` or `psa_drv_se_mac_verify_t` functions), or in
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* parts using the following sequence:
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* - `psa_drv_se_mac_setup_t`
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* - `psa_drv_se_mac_update_t`
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* - `psa_drv_se_mac_update_t`
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* - ...
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* - `psa_drv_se_mac_finish_t` or `psa_drv_se_mac_finish_verify_t`
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*
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* If a previously started secure element MAC operation needs to be terminated,
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* it should be done so by the `psa_drv_se_mac_abort_t`. Failure to do so may
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* result in allocated resources not being freed or in other undefined
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* behavior.
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*/
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/**@{*/
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/** \brief A function that starts a secure element MAC operation for a PSA
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* Crypto Driver implementation
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*
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* \param[in,out] p_context A structure that will contain the
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* hardware-specific MAC context
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* \param[in] key_slot The slot of the key to be used for the
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* operation
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* \param[in] algorithm The algorithm to be used to underly the MAC
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* operation
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*
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* \retval PSA_SUCCESS
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* Success.
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*/
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typedef psa_status_t (*psa_drv_se_mac_setup_t)(void *p_context,
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psa_key_slot_number_t key_slot,
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psa_algorithm_t algorithm);
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/** \brief A function that continues a previously started secure element MAC
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* operation
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*
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* \param[in,out] p_context A hardware-specific structure for the
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* previously-established MAC operation to be
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* updated
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* \param[in] p_input A buffer containing the message to be appended
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* to the MAC operation
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* \param[in] input_length The size in bytes of the input message buffer
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*/
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typedef psa_status_t (*psa_drv_se_mac_update_t)(void *p_context,
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const uint8_t *p_input,
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size_t input_length);
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/** \brief a function that completes a previously started secure element MAC
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* operation by returning the resulting MAC.
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*
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* \param[in,out] p_context A hardware-specific structure for the
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* previously started MAC operation to be
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* finished
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* \param[out] p_mac A buffer where the generated MAC will be
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* placed
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* \param[in] mac_size The size in bytes of the buffer that has been
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* allocated for the `output` buffer
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* \param[out] p_mac_length After completion, will contain the number of
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* bytes placed in the `p_mac` buffer
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*
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* \retval PSA_SUCCESS
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* Success.
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*/
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typedef psa_status_t (*psa_drv_se_mac_finish_t)(void *p_context,
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uint8_t *p_mac,
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size_t mac_size,
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size_t *p_mac_length);
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/** \brief A function that completes a previously started secure element MAC
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* operation by comparing the resulting MAC against a provided value
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*
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* \param[in,out] p_context A hardware-specific structure for the previously
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* started MAC operation to be fiinished
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* \param[in] p_mac The MAC value against which the resulting MAC will
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* be compared against
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* \param[in] mac_length The size in bytes of the value stored in `p_mac`
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*
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* \retval PSA_SUCCESS
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* The operation completed successfully and the MACs matched each
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* other
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* \retval PSA_ERROR_INVALID_SIGNATURE
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* The operation completed successfully, but the calculated MAC did
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* not match the provided MAC
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*/
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typedef psa_status_t (*psa_drv_se_mac_finish_verify_t)(void *p_context,
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const uint8_t *p_mac,
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size_t mac_length);
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/** \brief A function that aborts a previous started secure element MAC
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* operation
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*
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* \param[in,out] p_context A hardware-specific structure for the previously
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* started MAC operation to be aborted
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*/
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typedef psa_status_t (*psa_drv_se_mac_abort_t)(void *p_context);
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/** \brief A function that performs a secure element MAC operation in one
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* command and returns the calculated MAC
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*
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* \param[in] p_input A buffer containing the message to be MACed
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* \param[in] input_length The size in bytes of `p_input`
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* \param[in] key_slot The slot of the key to be used
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* \param[in] alg The algorithm to be used to underlie the MAC
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* operation
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* \param[out] p_mac A buffer where the generated MAC will be
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* placed
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* \param[in] mac_size The size in bytes of the `p_mac` buffer
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* \param[out] p_mac_length After completion, will contain the number of
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* bytes placed in the `output` buffer
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*
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* \retval PSA_SUCCESS
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* Success.
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*/
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typedef psa_status_t (*psa_drv_se_mac_generate_t)(const uint8_t *p_input,
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size_t input_length,
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psa_key_slot_number_t key_slot,
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psa_algorithm_t alg,
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uint8_t *p_mac,
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size_t mac_size,
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size_t *p_mac_length);
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/** \brief A function that performs a secure element MAC operation in one
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* command and compares the resulting MAC against a provided value
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*
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* \param[in] p_input A buffer containing the message to be MACed
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* \param[in] input_length The size in bytes of `input`
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* \param[in] key_slot The slot of the key to be used
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* \param[in] alg The algorithm to be used to underlie the MAC
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* operation
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* \param[in] p_mac The MAC value against which the resulting MAC will
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* be compared against
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* \param[in] mac_length The size in bytes of `mac`
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*
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* \retval PSA_SUCCESS
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* The operation completed successfully and the MACs matched each
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* other
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* \retval PSA_ERROR_INVALID_SIGNATURE
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* The operation completed successfully, but the calculated MAC did
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* not match the provided MAC
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*/
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typedef psa_status_t (*psa_drv_se_mac_verify_t)(const uint8_t *p_input,
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size_t input_length,
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psa_key_slot_number_t key_slot,
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psa_algorithm_t alg,
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const uint8_t *p_mac,
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size_t mac_length);
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/** \brief A struct containing all of the function pointers needed to
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* perform secure element MAC operations
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*
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* PSA Crypto API implementations should populate the table as appropriate
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* upon startup.
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*
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* If one of the functions is not implemented (such as
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* `psa_drv_se_mac_generate_t`), it should be set to NULL.
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*
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* Driver implementers should ensure that they implement all of the functions
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* that make sense for their hardware, and that they provide a full solution
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* (for example, if they support `p_setup`, they should also support
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* `p_update` and at least one of `p_finish` or `p_finish_verify`).
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*
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*/
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typedef struct {
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/**The size in bytes of the hardware-specific secure element MAC context
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* structure
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*/
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size_t context_size;
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/** Function that performs a MAC setup operation
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*/
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psa_drv_se_mac_setup_t p_setup;
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/** Function that performs a MAC update operation
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*/
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psa_drv_se_mac_update_t p_update;
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/** Function that completes a MAC operation
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*/
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psa_drv_se_mac_finish_t p_finish;
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/** Function that completes a MAC operation with a verify check
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*/
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psa_drv_se_mac_finish_verify_t p_finish_verify;
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/** Function that aborts a previoustly started MAC operation
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*/
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psa_drv_se_mac_abort_t p_abort;
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/** Function that performs a MAC operation in one call
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*/
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psa_drv_se_mac_generate_t p_mac;
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/** Function that performs a MAC and verify operation in one call
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*/
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psa_drv_se_mac_verify_t p_mac_verify;
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} psa_drv_se_mac_t;
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/**@}*/
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/** \defgroup se_cipher Secure Element Symmetric Ciphers
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*
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* Encryption and Decryption using secure element keys in block modes other
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* than ECB must be done in multiple parts, using the following flow:
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* - `psa_drv_se_cipher_setup_t`
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* - `psa_drv_se_cipher_set_iv_t` (optional depending upon block mode)
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* - `psa_drv_se_cipher_update_t`
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* - `psa_drv_se_cipher_update_t`
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* - ...
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* - `psa_drv_se_cipher_finish_t`
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*
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* If a previously started secure element Cipher operation needs to be
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* terminated, it should be done so by the `psa_drv_se_cipher_abort_t`. Failure
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* to do so may result in allocated resources not being freed or in other
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* undefined behavior.
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*
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* In situations where a PSA Cryptographic API implementation is using a block
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* mode not-supported by the underlying hardware or driver, it can construct
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* the block mode itself, while calling the `psa_drv_se_cipher_ecb_t` function
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* for the cipher operations.
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*/
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/**@{*/
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/** \brief A function that provides the cipher setup function for a
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* secure element driver
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*
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* \param[in,out] p_context A structure that will contain the
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* hardware-specific cipher context.
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* \param[in] key_slot The slot of the key to be used for the
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* operation
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* \param[in] algorithm The algorithm to be used in the cipher
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* operation
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* \param[in] direction Indicates whether the operation is an encrypt
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* or decrypt
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*
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* \retval PSA_SUCCESS
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* \retval PSA_ERROR_NOT_SUPPORTED
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*/
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typedef psa_status_t (*psa_drv_se_cipher_setup_t)(void *p_context,
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psa_key_slot_number_t key_slot,
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psa_algorithm_t algorithm,
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psa_encrypt_or_decrypt_t direction);
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/** \brief A function that sets the initialization vector (if
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* necessary) for an secure element cipher operation
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*
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* Rationale: The `psa_se_cipher_*` operation in the PSA Cryptographic API has
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* two IV functions: one to set the IV, and one to generate it internally. The
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* generate function is not necessary for the drivers to implement as the PSA
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* Crypto implementation can do the generation using its RNG features.
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*
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* \param[in,out] p_context A structure that contains the previously set up
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* hardware-specific cipher context
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* \param[in] p_iv A buffer containing the initialization vector
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* \param[in] iv_length The size (in bytes) of the `p_iv` buffer
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*
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* \retval PSA_SUCCESS
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*/
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typedef psa_status_t (*psa_drv_se_cipher_set_iv_t)(void *p_context,
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const uint8_t *p_iv,
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size_t iv_length);
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/** \brief A function that continues a previously started secure element cipher
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* operation
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*
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* \param[in,out] p_context A hardware-specific structure for the
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* previously started cipher operation
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* \param[in] p_input A buffer containing the data to be
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* encrypted/decrypted
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* \param[in] input_size The size in bytes of the buffer pointed to
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* by `p_input`
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* \param[out] p_output The caller-allocated buffer where the
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* output will be placed
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* \param[in] output_size The allocated size in bytes of the
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* `p_output` buffer
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* \param[out] p_output_length After completion, will contain the number
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* of bytes placed in the `p_output` buffer
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*
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* \retval PSA_SUCCESS
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*/
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typedef psa_status_t (*psa_drv_se_cipher_update_t)(void *p_context,
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const uint8_t *p_input,
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size_t input_size,
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uint8_t *p_output,
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size_t output_size,
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size_t *p_output_length);
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/** \brief A function that completes a previously started secure element cipher
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* operation
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*
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* \param[in,out] p_context A hardware-specific structure for the
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* previously started cipher operation
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* \param[out] p_output The caller-allocated buffer where the output
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* will be placed
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* \param[in] output_size The allocated size in bytes of the `p_output`
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* buffer
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* \param[out] p_output_length After completion, will contain the number of
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* bytes placed in the `p_output` buffer
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*
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* \retval PSA_SUCCESS
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*/
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typedef psa_status_t (*psa_drv_se_cipher_finish_t)(void *p_context,
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uint8_t *p_output,
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size_t output_size,
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size_t *p_output_length);
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/** \brief A function that aborts a previously started secure element cipher
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* operation
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*
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* \param[in,out] p_context A hardware-specific structure for the
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* previously started cipher operation
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*/
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typedef psa_status_t (*psa_drv_se_cipher_abort_t)(void *p_context);
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/** \brief A function that performs the ECB block mode for secure element
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* cipher operations
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*
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* Note: this function should only be used with implementations that do not
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* provide a needed higher-level operation.
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*
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* \param[in] key_slot The slot of the key to be used for the operation
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* \param[in] algorithm The algorithm to be used in the cipher operation
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* \param[in] direction Indicates whether the operation is an encrypt or
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* decrypt
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* \param[in] p_input A buffer containing the data to be
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* encrypted/decrypted
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* \param[in] input_size The size in bytes of the buffer pointed to by
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* `p_input`
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* \param[out] p_output The caller-allocated buffer where the output will
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* be placed
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* \param[in] output_size The allocated size in bytes of the `p_output`
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* buffer
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*
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* \retval PSA_SUCCESS
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* \retval PSA_ERROR_NOT_SUPPORTED
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*/
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typedef psa_status_t (*psa_drv_se_cipher_ecb_t)(psa_key_slot_number_t key_slot,
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psa_algorithm_t algorithm,
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psa_encrypt_or_decrypt_t direction,
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const uint8_t *p_input,
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size_t input_size,
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uint8_t *p_output,
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size_t output_size);
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/**
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* \brief A struct containing all of the function pointers needed to implement
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* cipher operations using secure elements.
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*
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* PSA Crypto API implementations should populate instances of the table as
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* appropriate upon startup or at build time.
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*
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* If one of the functions is not implemented (such as
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* `psa_drv_se_cipher_ecb_t`), it should be set to NULL.
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*/
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typedef struct {
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/** The size in bytes of the hardware-specific secure element cipher
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* context structure
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*/
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size_t context_size;
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/** Function that performs a cipher setup operation */
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psa_drv_se_cipher_setup_t p_setup;
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/** Function that sets a cipher IV (if necessary) */
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psa_drv_se_cipher_set_iv_t p_set_iv;
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/** Function that performs a cipher update operation */
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psa_drv_se_cipher_update_t p_update;
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/** Function that completes a cipher operation */
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psa_drv_se_cipher_finish_t p_finish;
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/** Function that aborts a cipher operation */
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psa_drv_se_cipher_abort_t p_abort;
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/** Function that performs ECB mode for a cipher operation
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* (Danger: ECB mode should not be used directly by clients of the PSA
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* Crypto Client API)
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*/
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psa_drv_se_cipher_ecb_t p_ecb;
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} psa_drv_se_cipher_t;
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/**@}*/
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/** \defgroup se_asymmetric Secure Element Asymmetric Cryptography
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*
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* Since the amount of data that can (or should) be encrypted or signed using
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* asymmetric keys is limited by the key size, asymmetric key operations using
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* keys in a secure element must be done in single function calls.
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*/
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/**@{*/
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/**
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* \brief A function that signs a hash or short message with a private key in
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* a secure element
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*
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* \param[in] key_slot Key slot of an asymmetric key pair
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* \param[in] alg A signature algorithm that is compatible
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* with the type of `key`
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* \param[in] p_hash The hash to sign
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* \param[in] hash_length Size of the `p_hash` buffer in bytes
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* \param[out] p_signature Buffer where the signature is to be written
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* \param[in] signature_size Size of the `p_signature` buffer in bytes
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* \param[out] p_signature_length On success, the number of bytes
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* that make up the returned signature value
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*
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* \retval PSA_SUCCESS
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*/
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typedef psa_status_t (*psa_drv_se_asymmetric_sign_t)(psa_key_slot_number_t key_slot,
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psa_algorithm_t alg,
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const uint8_t *p_hash,
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size_t hash_length,
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uint8_t *p_signature,
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size_t signature_size,
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size_t *p_signature_length);
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/**
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* \brief A function that verifies the signature a hash or short message using
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* an asymmetric public key in a secure element
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*
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* \param[in] key_slot Key slot of a public key or an asymmetric key
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* pair
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* \param[in] alg A signature algorithm that is compatible with
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* the type of `key`
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* \param[in] p_hash The hash whose signature is to be verified
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* \param[in] hash_length Size of the `p_hash` buffer in bytes
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* \param[in] p_signature Buffer containing the signature to verify
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|
* \param[in] signature_length Size of the `p_signature` buffer in bytes
|
|
*
|
|
* \retval PSA_SUCCESS
|
|
* The signature is valid.
|
|
*/
|
|
typedef psa_status_t (*psa_drv_se_asymmetric_verify_t)(psa_key_slot_number_t key_slot,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *p_hash,
|
|
size_t hash_length,
|
|
const uint8_t *p_signature,
|
|
size_t signature_length);
|
|
|
|
/**
|
|
* \brief A function that encrypts a short message with an asymmetric public
|
|
* key in a secure element
|
|
*
|
|
* \param[in] key_slot Key slot of a public key or an asymmetric key
|
|
* pair
|
|
* \param[in] alg An asymmetric encryption algorithm that is
|
|
* compatible with the type of `key`
|
|
* \param[in] p_input The message to encrypt
|
|
* \param[in] input_length Size of the `p_input` buffer in bytes
|
|
* \param[in] p_salt A salt or label, if supported by the
|
|
* encryption algorithm
|
|
* If the algorithm does not support a
|
|
* salt, pass `NULL`.
|
|
* If the algorithm supports an optional
|
|
* salt and you do not want to pass a salt,
|
|
* pass `NULL`.
|
|
* For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
|
|
* supported.
|
|
* \param[in] salt_length Size of the `p_salt` buffer in bytes
|
|
* If `p_salt` is `NULL`, pass 0.
|
|
* \param[out] p_output Buffer where the encrypted message is to
|
|
* be written
|
|
* \param[in] output_size Size of the `p_output` buffer in bytes
|
|
* \param[out] p_output_length On success, the number of bytes that make up
|
|
* the returned output
|
|
*
|
|
* \retval PSA_SUCCESS
|
|
*/
|
|
typedef psa_status_t (*psa_drv_se_asymmetric_encrypt_t)(psa_key_slot_number_t key_slot,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *p_input,
|
|
size_t input_length,
|
|
const uint8_t *p_salt,
|
|
size_t salt_length,
|
|
uint8_t *p_output,
|
|
size_t output_size,
|
|
size_t *p_output_length);
|
|
|
|
/**
|
|
* \brief A function that decrypts a short message with an asymmetric private
|
|
* key in a secure element.
|
|
*
|
|
* \param[in] key_slot Key slot of an asymmetric key pair
|
|
* \param[in] alg An asymmetric encryption algorithm that is
|
|
* compatible with the type of `key`
|
|
* \param[in] p_input The message to decrypt
|
|
* \param[in] input_length Size of the `p_input` buffer in bytes
|
|
* \param[in] p_salt A salt or label, if supported by the
|
|
* encryption algorithm
|
|
* If the algorithm does not support a
|
|
* salt, pass `NULL`.
|
|
* If the algorithm supports an optional
|
|
* salt and you do not want to pass a salt,
|
|
* pass `NULL`.
|
|
* For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
|
|
* supported.
|
|
* \param[in] salt_length Size of the `p_salt` buffer in bytes
|
|
* If `p_salt` is `NULL`, pass 0.
|
|
* \param[out] p_output Buffer where the decrypted message is to
|
|
* be written
|
|
* \param[in] output_size Size of the `p_output` buffer in bytes
|
|
* \param[out] p_output_length On success, the number of bytes
|
|
* that make up the returned output
|
|
*
|
|
* \retval PSA_SUCCESS
|
|
*/
|
|
typedef psa_status_t (*psa_drv_se_asymmetric_decrypt_t)(psa_key_slot_number_t key_slot,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *p_input,
|
|
size_t input_length,
|
|
const uint8_t *p_salt,
|
|
size_t salt_length,
|
|
uint8_t *p_output,
|
|
size_t output_size,
|
|
size_t *p_output_length);
|
|
|
|
/**
|
|
* \brief A struct containing all of the function pointers needed to implement
|
|
* asymmetric cryptographic operations using secure elements.
|
|
*
|
|
* PSA Crypto API implementations should populate instances of the table as
|
|
* appropriate upon startup or at build time.
|
|
*
|
|
* If one of the functions is not implemented, it should be set to NULL.
|
|
*/
|
|
typedef struct {
|
|
/** Function that performs an asymmetric sign operation */
|
|
psa_drv_se_asymmetric_sign_t p_sign;
|
|
/** Function that performs an asymmetric verify operation */
|
|
psa_drv_se_asymmetric_verify_t p_verify;
|
|
/** Function that performs an asymmetric encrypt operation */
|
|
psa_drv_se_asymmetric_encrypt_t p_encrypt;
|
|
/** Function that performs an asymmetric decrypt operation */
|
|
psa_drv_se_asymmetric_decrypt_t p_decrypt;
|
|
} psa_drv_se_asymmetric_t;
|
|
|
|
/**@}*/
|
|
|
|
/** \defgroup se_aead Secure Element Authenticated Encryption with Additional Data
|
|
* Authenticated Encryption with Additional Data (AEAD) operations with secure
|
|
* elements must be done in one function call. While this creates a burden for
|
|
* implementers as there must be sufficient space in memory for the entire
|
|
* message, it prevents decrypted data from being made available before the
|
|
* authentication operation is complete and the data is known to be authentic.
|
|
*/
|
|
/**@{*/
|
|
|
|
/** \brief A function that performs a secure element authenticated encryption
|
|
* operation
|
|
*
|
|
* \param[in] key_slot Slot containing the key to use.
|
|
* \param[in] algorithm The AEAD algorithm to compute
|
|
* (\c PSA_ALG_XXX value such that
|
|
* #PSA_ALG_IS_AEAD(`alg`) is true)
|
|
* \param[in] p_nonce Nonce or IV to use
|
|
* \param[in] nonce_length Size of the `p_nonce` buffer in bytes
|
|
* \param[in] p_additional_data Additional data that will be
|
|
* authenticated but not encrypted
|
|
* \param[in] additional_data_length Size of `p_additional_data` in bytes
|
|
* \param[in] p_plaintext Data that will be authenticated and
|
|
* encrypted
|
|
* \param[in] plaintext_length Size of `p_plaintext` in bytes
|
|
* \param[out] p_ciphertext Output buffer for the authenticated and
|
|
* encrypted data. The additional data is
|
|
* not part of this output. For algorithms
|
|
* where the encrypted data and the
|
|
* authentication tag are defined as
|
|
* separate outputs, the authentication
|
|
* tag is appended to the encrypted data.
|
|
* \param[in] ciphertext_size Size of the `p_ciphertext` buffer in
|
|
* bytes
|
|
* \param[out] p_ciphertext_length On success, the size of the output in
|
|
* the `p_ciphertext` buffer
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* Success.
|
|
*/
|
|
typedef psa_status_t (*psa_drv_se_aead_encrypt_t)(psa_key_slot_number_t key_slot,
|
|
psa_algorithm_t algorithm,
|
|
const uint8_t *p_nonce,
|
|
size_t nonce_length,
|
|
const uint8_t *p_additional_data,
|
|
size_t additional_data_length,
|
|
const uint8_t *p_plaintext,
|
|
size_t plaintext_length,
|
|
uint8_t *p_ciphertext,
|
|
size_t ciphertext_size,
|
|
size_t *p_ciphertext_length);
|
|
|
|
/** A function that peforms a secure element authenticated decryption operation
|
|
*
|
|
* \param[in] key_slot Slot containing the key to use
|
|
* \param[in] algorithm The AEAD algorithm to compute
|
|
* (\c PSA_ALG_XXX value such that
|
|
* #PSA_ALG_IS_AEAD(`alg`) is true)
|
|
* \param[in] p_nonce Nonce or IV to use
|
|
* \param[in] nonce_length Size of the `p_nonce` buffer in bytes
|
|
* \param[in] p_additional_data Additional data that has been
|
|
* authenticated but not encrypted
|
|
* \param[in] additional_data_length Size of `p_additional_data` in bytes
|
|
* \param[in] p_ciphertext Data that has been authenticated and
|
|
* encrypted.
|
|
* For algorithms where the encrypted data
|
|
* and the authentication tag are defined
|
|
* as separate inputs, the buffer must
|
|
* contain the encrypted data followed by
|
|
* the authentication tag.
|
|
* \param[in] ciphertext_length Size of `p_ciphertext` in bytes
|
|
* \param[out] p_plaintext Output buffer for the decrypted data
|
|
* \param[in] plaintext_size Size of the `p_plaintext` buffer in
|
|
* bytes
|
|
* \param[out] p_plaintext_length On success, the size of the output in
|
|
* the `p_plaintext` buffer
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* Success.
|
|
*/
|
|
typedef psa_status_t (*psa_drv_se_aead_decrypt_t)(psa_key_slot_number_t key_slot,
|
|
psa_algorithm_t algorithm,
|
|
const uint8_t *p_nonce,
|
|
size_t nonce_length,
|
|
const uint8_t *p_additional_data,
|
|
size_t additional_data_length,
|
|
const uint8_t *p_ciphertext,
|
|
size_t ciphertext_length,
|
|
uint8_t *p_plaintext,
|
|
size_t plaintext_size,
|
|
size_t *p_plaintext_length);
|
|
|
|
/**
|
|
* \brief A struct containing all of the function pointers needed to implement
|
|
* secure element Authenticated Encryption with Additional Data operations
|
|
*
|
|
* PSA Crypto API implementations should populate instances of the table as
|
|
* appropriate upon startup.
|
|
*
|
|
* If one of the functions is not implemented, it should be set to NULL.
|
|
*/
|
|
typedef struct {
|
|
/** Function that performs the AEAD encrypt operation */
|
|
psa_drv_se_aead_encrypt_t p_encrypt;
|
|
/** Function that performs the AEAD decrypt operation */
|
|
psa_drv_se_aead_decrypt_t p_decrypt;
|
|
} psa_drv_se_aead_t;
|
|
/**@}*/
|
|
|
|
/** \defgroup se_key_management Secure Element Key Management
|
|
* Currently, key management is limited to importing keys in the clear,
|
|
* destroying keys, and exporting keys in the clear.
|
|
* Whether a key may be exported is determined by the key policies in place
|
|
* on the key slot.
|
|
*/
|
|
/**@{*/
|
|
|
|
/** \brief A function that imports a key into a secure element in binary format
|
|
*
|
|
* This function can support any output from psa_export_key(). Refer to the
|
|
* documentation of psa_export_key() for the format for each key type.
|
|
*
|
|
* \param[in] key_slot Slot where the key will be stored
|
|
* This must be a valid slot for a key of the chosen
|
|
* type. It must be unoccupied.
|
|
* \param[in] lifetime The required lifetime of the key storage
|
|
* \param[in] type Key type (a \c PSA_KEY_TYPE_XXX value)
|
|
* \param[in] algorithm Key algorithm (a \c PSA_ALG_XXX value)
|
|
* \param[in] usage The allowed uses of the key
|
|
* \param[in] p_data Buffer containing the key data
|
|
* \param[in] data_length Size of the `data` buffer in bytes
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* Success.
|
|
*/
|
|
typedef psa_status_t (*psa_drv_se_import_key_t)(psa_key_slot_number_t key_slot,
|
|
psa_key_lifetime_t lifetime,
|
|
psa_key_type_t type,
|
|
psa_algorithm_t algorithm,
|
|
psa_key_usage_t usage,
|
|
const uint8_t *p_data,
|
|
size_t data_length);
|
|
|
|
/**
|
|
* \brief A function that destroys a secure element key and restore the slot to
|
|
* its default state
|
|
*
|
|
* This function destroys the content of the key from a secure element.
|
|
* Implementations shall make a best effort to ensure that any previous content
|
|
* of the slot is unrecoverable.
|
|
*
|
|
* This function returns the specified slot to its default state.
|
|
*
|
|
* \param[in] key_slot The key slot to erase.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* The slot's content, if any, has been erased.
|
|
*/
|
|
typedef psa_status_t (*psa_drv_se_destroy_key_t)(psa_key_slot_number_t key);
|
|
|
|
/**
|
|
* \brief A function that exports a secure element key in binary format
|
|
*
|
|
* The output of this function can be passed to psa_import_key() to
|
|
* create an equivalent object.
|
|
*
|
|
* If a key is created with `psa_import_key()` and then exported with
|
|
* this function, it is not guaranteed that the resulting data is
|
|
* identical: the implementation may choose a different representation
|
|
* of the same key if the format permits it.
|
|
*
|
|
* This function should generate output in the same format that
|
|
* `psa_export_key()` does. Refer to the
|
|
* documentation of `psa_export_key()` for the format for each key type.
|
|
*
|
|
* \param[in] key Slot whose content is to be exported. This must
|
|
* be an occupied key slot.
|
|
* \param[out] p_data Buffer where the key data is to be written.
|
|
* \param[in] data_size Size of the `p_data` buffer in bytes.
|
|
* \param[out] p_data_length On success, the number of bytes
|
|
* that make up the key data.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* \retval #PSA_ERROR_DOES_NOT_EXIST
|
|
* \retval #PSA_ERROR_NOT_PERMITTED
|
|
* \retval #PSA_ERROR_NOT_SUPPORTED
|
|
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
|
|
* \retval #PSA_ERROR_HARDWARE_FAILURE
|
|
* \retval #PSA_ERROR_TAMPERING_DETECTED
|
|
*/
|
|
typedef psa_status_t (*psa_drv_se_export_key_t)(psa_key_slot_number_t key,
|
|
uint8_t *p_data,
|
|
size_t data_size,
|
|
size_t *p_data_length);
|
|
|
|
/**
|
|
* \brief A function that generates a symmetric or asymmetric key on a secure
|
|
* element
|
|
*
|
|
* If \p type is asymmetric (`#PSA_KEY_TYPE_IS_ASYMMETRIC(\p type) == 1`),
|
|
* the public component of the generated key will be placed in `p_pubkey_out`.
|
|
* The format of the public key information will match the format specified for
|
|
* the psa_export_key() function for the key type.
|
|
*
|
|
* \param[in] key_slot Slot where the generated key will be placed
|
|
* \param[in] type The type of the key to be generated
|
|
* \param[in] usage The prescribed usage of the generated key
|
|
* Note: Not all Secure Elements support the same
|
|
* restrictions that PSA Crypto does (and vice versa).
|
|
* Driver developers should endeavor to match the
|
|
* usages as close as possible.
|
|
* \param[in] bits The size in bits of the key to be generated.
|
|
* \param[in] extra Extra parameters for key generation. The
|
|
* interpretation of this parameter should match the
|
|
* interpretation in the `extra` parameter is the
|
|
* `psa_generate_key` function
|
|
* \param[in] extra_size The size in bytes of the \p extra buffer
|
|
* \param[out] p_pubkey_out The buffer where the public key information will
|
|
* be placed
|
|
* \param[in] pubkey_out_size The size in bytes of the `p_pubkey_out` buffer
|
|
* \param[out] p_pubkey_length Upon successful completion, will contain the
|
|
* size of the data placed in `p_pubkey_out`.
|
|
*/
|
|
typedef psa_status_t (*psa_drv_se_generate_key_t)(psa_key_slot_number_t key_slot,
|
|
psa_key_type_t type,
|
|
psa_key_usage_t usage,
|
|
size_t bits,
|
|
const void *extra,
|
|
size_t extra_size,
|
|
uint8_t *p_pubkey_out,
|
|
size_t pubkey_out_size,
|
|
size_t *p_pubkey_length);
|
|
|
|
/**
|
|
* \brief A struct containing all of the function pointers needed to for secure
|
|
* element key management
|
|
*
|
|
* PSA Crypto API implementations should populate instances of the table as
|
|
* appropriate upon startup or at build time.
|
|
*
|
|
* If one of the functions is not implemented, it should be set to NULL.
|
|
*/
|
|
typedef struct {
|
|
/** Function that performs a key import operation */
|
|
psa_drv_se_import_key_t p_import;
|
|
/** Function that performs a generation */
|
|
psa_drv_se_generate_key_t p_generate;
|
|
/** Function that performs a key destroy operation */
|
|
psa_drv_se_destroy_key_t p_destroy;
|
|
/** Function that performs a key export operation */
|
|
psa_drv_se_export_key_t p_export;
|
|
} psa_drv_se_key_management_t;
|
|
|
|
/**@}*/
|
|
|
|
/** \defgroup driver_derivation Secure Element Key Derivation and Agreement
|
|
* Key derivation is the process of generating new key material using an
|
|
* existing key and additional parameters, iterating through a basic
|
|
* cryptographic function, such as a hash.
|
|
* Key agreement is a part of cryptographic protocols that allows two parties
|
|
* to agree on the same key value, but starting from different original key
|
|
* material.
|
|
* The flows are similar, and the PSA Crypto Driver Model uses the same functions
|
|
* for both of the flows.
|
|
*
|
|
* There are two different final functions for the flows,
|
|
* `psa_drv_se_key_derivation_derive` and `psa_drv_se_key_derivation_export`.
|
|
* `psa_drv_se_key_derivation_derive` is used when the key material should be
|
|
* placed in a slot on the hardware and not exposed to the caller.
|
|
* `psa_drv_se_key_derivation_export` is used when the key material should be
|
|
* returned to the PSA Cryptographic API implementation.
|
|
*
|
|
* Different key derivation algorithms require a different number of inputs.
|
|
* Instead of having an API that takes as input variable length arrays, which
|
|
* can be problemmatic to manage on embedded platforms, the inputs are passed
|
|
* to the driver via a function, `psa_drv_se_key_derivation_collateral`, that
|
|
* is called multiple times with different `collateral_id`s. Thus, for a key
|
|
* derivation algorithm that required 3 paramter inputs, the flow would look
|
|
* something like:
|
|
* ~~~~~~~~~~~~~{.c}
|
|
* psa_drv_se_key_derivation_setup(kdf_algorithm, source_key, dest_key_size_bytes);
|
|
* psa_drv_se_key_derivation_collateral(kdf_algorithm_collateral_id_0,
|
|
* p_collateral_0,
|
|
* collateral_0_size);
|
|
* psa_drv_se_key_derivation_collateral(kdf_algorithm_collateral_id_1,
|
|
* p_collateral_1,
|
|
* collateral_1_size);
|
|
* psa_drv_se_key_derivation_collateral(kdf_algorithm_collateral_id_2,
|
|
* p_collateral_2,
|
|
* collateral_2_size);
|
|
* psa_drv_se_key_derivation_derive();
|
|
* ~~~~~~~~~~~~~
|
|
*
|
|
* key agreement example:
|
|
* ~~~~~~~~~~~~~{.c}
|
|
* psa_drv_se_key_derivation_setup(alg, source_key. dest_key_size_bytes);
|
|
* psa_drv_se_key_derivation_collateral(DHE_PUBKEY, p_pubkey, pubkey_size);
|
|
* psa_drv_se_key_derivation_export(p_session_key,
|
|
* session_key_size,
|
|
* &session_key_length);
|
|
* ~~~~~~~~~~~~~
|
|
*/
|
|
/**@{*/
|
|
|
|
/** \brief A function that Sets up a secure element key derivation operation by
|
|
* specifying the algorithm and the source key sot
|
|
*
|
|
* \param[in,out] p_context A hardware-specific structure containing any
|
|
* context information for the implementation
|
|
* \param[in] kdf_alg The algorithm to be used for the key derivation
|
|
* \param[in] souce_key The key to be used as the source material for the
|
|
* key derivation
|
|
*
|
|
* \retval PSA_SUCCESS
|
|
*/
|
|
typedef psa_status_t (*psa_drv_se_key_derivation_setup_t)(void *p_context,
|
|
psa_algorithm_t kdf_alg,
|
|
psa_key_slot_number_t source_key);
|
|
|
|
/** \brief A function that provides collateral (parameters) needed for a secure
|
|
* element key derivation or key agreement operation
|
|
*
|
|
* Since many key derivation algorithms require multiple parameters, it is
|
|
* expeced that this function may be called multiple times for the same
|
|
* operation, each with a different algorithm-specific `collateral_id`
|
|
*
|
|
* \param[in,out] p_context A hardware-specific structure containing any
|
|
* context information for the implementation
|
|
* \param[in] collateral_id An ID for the collateral being provided
|
|
* \param[in] p_collateral A buffer containing the collateral data
|
|
* \param[in] collateral_size The size in bytes of the collateral
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*
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* \retval PSA_SUCCESS
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*/
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typedef psa_status_t (*psa_drv_se_key_derivation_collateral_t)(void *p_context,
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uint32_t collateral_id,
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const uint8_t *p_collateral,
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|
size_t collateral_size);
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|
|
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/** \brief A function that performs the final secure element key derivation
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|
* step and place the generated key material in a slot
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|
*
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|
* \param[in,out] p_context A hardware-specific structure containing any
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|
* context information for the implementation
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|
* \param[in] dest_key The slot where the generated key material
|
|
* should be placed
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|
*
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|
* \retval PSA_SUCCESS
|
|
*/
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|
typedef psa_status_t (*psa_drv_se_key_derivation_derive_t)(void *p_context,
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|
psa_key_slot_number_t dest_key);
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|
|
|
/** \brief A function that performs the final step of a secure element key
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|
* agreement and place the generated key material in a buffer
|
|
*
|
|
* \param[out] p_output Buffer in which to place the generated key
|
|
* material
|
|
* \param[in] output_size The size in bytes of `p_output`
|
|
* \param[out] p_output_length Upon success, contains the number of bytes of
|
|
* key material placed in `p_output`
|
|
*
|
|
* \retval PSA_SUCCESS
|
|
*/
|
|
typedef psa_status_t (*psa_drv_se_key_derivation_export_t)(void *p_context,
|
|
uint8_t *p_output,
|
|
size_t output_size,
|
|
size_t *p_output_length);
|
|
|
|
/**
|
|
* \brief A struct containing all of the function pointers needed to for secure
|
|
* element key derivation and agreement
|
|
*
|
|
* PSA Crypto API implementations should populate instances of the table as
|
|
* appropriate upon startup.
|
|
*
|
|
* If one of the functions is not implemented, it should be set to NULL.
|
|
*/
|
|
typedef struct {
|
|
/** The driver-specific size of the key derivation context */
|
|
size_t context_size;
|
|
/** Function that performs a key derivation setup */
|
|
psa_drv_se_key_derivation_setup_t p_setup;
|
|
/** Function that sets key derivation collateral */
|
|
psa_drv_se_key_derivation_collateral_t p_collateral;
|
|
/** Function that performs a final key derivation step */
|
|
psa_drv_se_key_derivation_derive_t p_derive;
|
|
/** Function that perforsm a final key derivation or agreement and
|
|
* exports the key */
|
|
psa_drv_se_key_derivation_export_t p_export;
|
|
} psa_drv_se_key_derivation_t;
|
|
|
|
/**@}*/
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* PSA_CRYPTO_SE_DRIVER_H */
|