adbec81cc4
This change affects the psa_key_derivation_s structure. With the buffer removed from the union, it is empty if MBEDTLS_MD_C is not defined. We can avoid undefined behaviour by adding a new dummy field that is always present or make the whole union conditional on MBEDTLS_MD_C. In this latter case the initialiser macro has to depend on MBEDTLS_MD_C as well. Furthermore the first structure would be either psa_hkdf_key_derivation_t or psa_tls12_prf_key_derivation_t both of which are very deep and would make the initialisation macro difficult to maintain, therefore we go with the first option.
531 lines
22 KiB
C
531 lines
22 KiB
C
/**
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* \file psa/crypto_extra.h
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*
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* \brief PSA cryptography module: Mbed TLS vendor extensions
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*
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* \note This file may not be included directly. Applications must
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* include psa/crypto.h.
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*
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* This file is reserved for vendor-specific definitions.
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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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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#ifndef PSA_CRYPTO_EXTRA_H
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#define PSA_CRYPTO_EXTRA_H
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#include "mbedtls/platform_util.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* UID for secure storage seed */
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#define PSA_CRYPTO_ITS_RANDOM_SEED_UID 0xFFFFFF52
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/*
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* Deprecated PSA Crypto error code definitions
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*/
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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#define PSA_ERROR_UNKNOWN_ERROR \
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MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( PSA_ERROR_GENERIC_ERROR )
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#endif
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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#define PSA_ERROR_OCCUPIED_SLOT \
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MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( PSA_ERROR_ALREADY_EXISTS )
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#endif
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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#define PSA_ERROR_EMPTY_SLOT \
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MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( PSA_ERROR_DOES_NOT_EXIST )
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#endif
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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#define PSA_ERROR_INSUFFICIENT_CAPACITY \
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MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( PSA_ERROR_INSUFFICIENT_DATA )
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#endif
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/** \addtogroup attributes
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* @{
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*/
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/** \brief Declare the enrollment algorithm for a key.
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*
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* An operation on a key may indifferently use the algorithm set with
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* psa_set_key_algorithm() or with this function.
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*
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* \param[out] attributes The attribute structure to write to.
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* \param alg2 A second algorithm that the key may be used
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* for, in addition to the algorithm set with
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* psa_set_key_algorithm().
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*
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* \warning Setting an enrollment algorithm is not recommended, because
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* using the same key with different algorithms can allow some
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* attacks based on arithmetic relations between different
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* computations made with the same key, or can escalate harmless
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* side channels into exploitable ones. Use this function only
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* if it is necessary to support a protocol for which it has been
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* verified that the usage of the key with multiple algorithms
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* is safe.
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*/
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static inline void psa_set_key_enrollment_algorithm(
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psa_key_attributes_t *attributes,
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psa_algorithm_t alg2)
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{
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attributes->policy.alg2 = alg2;
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}
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/** Retrieve the enrollment algorithm policy from key attributes.
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*
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* \param[in] attributes The key attribute structure to query.
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*
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* \return The enrollment algorithm stored in the attribute structure.
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*/
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static inline psa_algorithm_t psa_get_key_enrollment_algorithm(
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const psa_key_attributes_t *attributes)
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{
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return( attributes->policy.alg2 );
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}
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/**@}*/
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/**
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* \brief Library deinitialization.
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*
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* This function clears all data associated with the PSA layer,
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* including the whole key store.
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*
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* This is an Mbed TLS extension.
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*/
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void mbedtls_psa_crypto_free( void );
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/** \brief Statistics about
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* resource consumption related to the PSA keystore.
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*
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* \note The content of this structure is not part of the stable API and ABI
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* of Mbed Crypto and may change arbitrarily from version to version.
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*/
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typedef struct mbedtls_psa_stats_s
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{
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/** Number of slots containing key material for a volatile key. */
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size_t volatile_slots;
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/** Number of slots containing key material for a key which is in
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* internal persistent storage. */
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size_t persistent_slots;
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/** Number of slots containing a reference to a key in a
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* secure element. */
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size_t external_slots;
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/** Number of slots which are occupied, but do not contain
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* key material yet. */
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size_t half_filled_slots;
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/** Number of slots that contain cache data. */
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size_t cache_slots;
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/** Number of slots that are not used for anything. */
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size_t empty_slots;
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/** Largest key id value among open keys in internal persistent storage. */
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psa_key_id_t max_open_internal_key_id;
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/** Largest key id value among open keys in secure elements. */
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psa_key_id_t max_open_external_key_id;
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} mbedtls_psa_stats_t;
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/** \brief Get statistics about
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* resource consumption related to the PSA keystore.
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*
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* \note When Mbed Crypto is built as part of a service, with isolation
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* between the application and the keystore, the service may or
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* may not expose this function.
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*/
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void mbedtls_psa_get_stats( mbedtls_psa_stats_t *stats );
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/**
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* \brief Inject an initial entropy seed for the random generator into
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* secure storage.
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*
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* This function injects data to be used as a seed for the random generator
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* used by the PSA Crypto implementation. On devices that lack a trusted
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* entropy source (preferably a hardware random number generator),
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* the Mbed PSA Crypto implementation uses this value to seed its
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* random generator.
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*
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* On devices without a trusted entropy source, this function must be
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* called exactly once in the lifetime of the device. On devices with
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* a trusted entropy source, calling this function is optional.
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* In all cases, this function may only be called before calling any
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* other function in the PSA Crypto API, including psa_crypto_init().
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*
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* When this function returns successfully, it populates a file in
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* persistent storage. Once the file has been created, this function
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* can no longer succeed.
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*
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* If any error occurs, this function does not change the system state.
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* You can call this function again after correcting the reason for the
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* error if possible.
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*
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* \warning This function **can** fail! Callers MUST check the return status.
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*
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* \warning If you use this function, you should use it as part of a
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* factory provisioning process. The value of the injected seed
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* is critical to the security of the device. It must be
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* *secret*, *unpredictable* and (statistically) *unique per device*.
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* You should be generate it randomly using a cryptographically
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* secure random generator seeded from trusted entropy sources.
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* You should transmit it securely to the device and ensure
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* that its value is not leaked or stored anywhere beyond the
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* needs of transmitting it from the point of generation to
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* the call of this function, and erase all copies of the value
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* once this function returns.
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*
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* This is an Mbed TLS extension.
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*
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* \note This function is only available on the following platforms:
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* * If the compile-time option MBEDTLS_PSA_INJECT_ENTROPY is enabled.
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* Note that you must provide compatible implementations of
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* mbedtls_nv_seed_read and mbedtls_nv_seed_write.
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* * In a client-server integration of PSA Cryptography, on the client side,
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* if the server supports this feature.
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* \param[in] seed Buffer containing the seed value to inject.
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* \param[in] seed_size Size of the \p seed buffer.
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* The size of the seed in bytes must be greater
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* or equal to both #MBEDTLS_ENTROPY_MIN_PLATFORM
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* and #MBEDTLS_ENTROPY_BLOCK_SIZE.
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* It must be less or equal to
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* #MBEDTLS_ENTROPY_MAX_SEED_SIZE.
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*
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* \retval #PSA_SUCCESS
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* The seed value was injected successfully. The random generator
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* of the PSA Crypto implementation is now ready for use.
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* You may now call psa_crypto_init() and use the PSA Crypto
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* implementation.
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* \p seed_size is out of range.
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* \retval #PSA_ERROR_STORAGE_FAILURE
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* There was a failure reading or writing from storage.
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* \retval #PSA_ERROR_NOT_PERMITTED
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* The library has already been initialized. It is no longer
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* possible to call this function.
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*/
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psa_status_t mbedtls_psa_inject_entropy(const unsigned char *seed,
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size_t seed_size);
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#if defined(PSA_PRE_1_0_KEY_DERIVATION)
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/** Set up a key derivation operation.
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*
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* FIMXE This function is no longer part of the official API. Its prototype
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* is only kept around for the sake of tests that haven't been updated yet.
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*
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* A key derivation algorithm takes three inputs: a secret input \p handle and
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* two non-secret inputs \p label and p salt.
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* The result of this function is a byte generator which can
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* be used to produce keys and other cryptographic material.
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*
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* The role of \p label and \p salt is as follows:
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* - For HKDF (#PSA_ALG_HKDF), \p salt is the salt used in the "extract" step
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* and \p label is the info string used in the "expand" step.
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*
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* \param[in,out] operation The key derivation object to set up. It must
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* have been initialized as per the documentation
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* for #psa_key_derivation_operation_t and not
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* yet be in use.
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* \param handle Handle to the secret key.
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* \param alg The key derivation algorithm to compute
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* (\c PSA_ALG_XXX value such that
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* #PSA_ALG_IS_KEY_DERIVATION(\p alg) is true).
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* \param[in] salt Salt to use.
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* \param salt_length Size of the \p salt buffer in bytes.
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* \param[in] label Label to use.
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* \param label_length Size of the \p label buffer in bytes.
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* \param capacity The maximum number of bytes that the
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* operation will be able to provide.
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*
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* \retval #PSA_SUCCESS
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* Success.
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* \retval #PSA_ERROR_INVALID_HANDLE
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* \retval #PSA_ERROR_EMPTY_SLOT
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* \retval #PSA_ERROR_NOT_PERMITTED
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* \c key is not compatible with \c alg,
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* or \p capacity is too large for the specified algorithm and key.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* \c alg is not supported or is not a key derivation algorithm.
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* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
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* \retval #PSA_ERROR_COMMUNICATION_FAILURE
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* \retval #PSA_ERROR_HARDWARE_FAILURE
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* \retval #PSA_ERROR_CORRUPTION_DETECTED
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* \retval #PSA_ERROR_BAD_STATE
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* The library has not been previously initialized by psa_crypto_init().
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* It is implementation-dependent whether a failure to initialize
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* results in this error code.
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*/
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psa_status_t psa_key_derivation(psa_key_derivation_operation_t *operation,
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psa_key_handle_t handle,
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psa_algorithm_t alg,
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const uint8_t *salt,
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size_t salt_length,
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const uint8_t *label,
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size_t label_length,
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size_t capacity);
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#endif /* PSA_PRE_1_0_KEY_DERIVATION */
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/** \addtogroup crypto_types
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* @{
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|
*/
|
|
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/** DSA public key.
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*
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* The import and export format is the
|
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* representation of the public key `y = g^x mod p` as a big-endian byte
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* string. The length of the byte string is the length of the base prime `p`
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* in bytes.
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|
*/
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#define PSA_KEY_TYPE_DSA_PUBLIC_KEY ((psa_key_type_t)0x60020000)
|
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|
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/** DSA key pair (private and public key).
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*
|
|
* The import and export format is the
|
|
* representation of the private key `x` as a big-endian byte string. The
|
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* length of the byte string is the private key size in bytes (leading zeroes
|
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* are not stripped).
|
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*
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|
* Determinstic DSA key derivation with psa_generate_derived_key follows
|
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* FIPS 186-4 §B.1.2: interpret the byte string as integer
|
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* in big-endian order. Discard it if it is not in the range
|
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* [0, *N* - 2] where *N* is the boundary of the private key domain
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* (the prime *p* for Diffie-Hellman, the subprime *q* for DSA,
|
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* or the order of the curve's base point for ECC).
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* Add 1 to the resulting integer and use this as the private key *x*.
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*
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*/
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#define PSA_KEY_TYPE_DSA_KEY_PAIR ((psa_key_type_t)0x70020000)
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/** Whether a key type is an DSA key (pair or public-only). */
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|
#define PSA_KEY_TYPE_IS_DSA(type) \
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(PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(type) == PSA_KEY_TYPE_DSA_PUBLIC_KEY)
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|
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#define PSA_ALG_DSA_BASE ((psa_algorithm_t)0x10040000)
|
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/** DSA signature with hashing.
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|
*
|
|
* This is the signature scheme defined by FIPS 186-4,
|
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* with a random per-message secret number (*k*).
|
|
*
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* \param hash_alg A hash algorithm (\c PSA_ALG_XXX value such that
|
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* #PSA_ALG_IS_HASH(\p hash_alg) is true).
|
|
* This includes #PSA_ALG_ANY_HASH
|
|
* when specifying the algorithm in a usage policy.
|
|
*
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* \return The corresponding DSA signature algorithm.
|
|
* \return Unspecified if \p hash_alg is not a supported
|
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* hash algorithm.
|
|
*/
|
|
#define PSA_ALG_DSA(hash_alg) \
|
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(PSA_ALG_DSA_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
|
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#define PSA_ALG_DETERMINISTIC_DSA_BASE ((psa_algorithm_t)0x10050000)
|
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#define PSA_ALG_DSA_DETERMINISTIC_FLAG ((psa_algorithm_t)0x00010000)
|
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/** Deterministic DSA signature with hashing.
|
|
*
|
|
* This is the deterministic variant defined by RFC 6979 of
|
|
* the signature scheme defined by FIPS 186-4.
|
|
*
|
|
* \param hash_alg A hash algorithm (\c PSA_ALG_XXX value such that
|
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* #PSA_ALG_IS_HASH(\p hash_alg) is true).
|
|
* This includes #PSA_ALG_ANY_HASH
|
|
* when specifying the algorithm in a usage policy.
|
|
*
|
|
* \return The corresponding DSA signature algorithm.
|
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* \return Unspecified if \p hash_alg is not a supported
|
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* hash algorithm.
|
|
*/
|
|
#define PSA_ALG_DETERMINISTIC_DSA(hash_alg) \
|
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(PSA_ALG_DETERMINISTIC_DSA_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
|
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#define PSA_ALG_IS_DSA(alg) \
|
|
(((alg) & ~PSA_ALG_HASH_MASK & ~PSA_ALG_DSA_DETERMINISTIC_FLAG) == \
|
|
PSA_ALG_DSA_BASE)
|
|
#define PSA_ALG_DSA_IS_DETERMINISTIC(alg) \
|
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(((alg) & PSA_ALG_DSA_DETERMINISTIC_FLAG) != 0)
|
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#define PSA_ALG_IS_DETERMINISTIC_DSA(alg) \
|
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(PSA_ALG_IS_DSA(alg) && PSA_ALG_DSA_IS_DETERMINISTIC(alg))
|
|
#define PSA_ALG_IS_RANDOMIZED_DSA(alg) \
|
|
(PSA_ALG_IS_DSA(alg) && !PSA_ALG_DSA_IS_DETERMINISTIC(alg))
|
|
|
|
|
|
/* We need to expand the sample definition of this macro from
|
|
* the API definition. */
|
|
#undef PSA_ALG_IS_HASH_AND_SIGN
|
|
#define PSA_ALG_IS_HASH_AND_SIGN(alg) \
|
|
(PSA_ALG_IS_RSA_PSS(alg) || PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg) || \
|
|
PSA_ALG_IS_DSA(alg) || PSA_ALG_IS_ECDSA(alg))
|
|
|
|
/**@}*/
|
|
|
|
/** \addtogroup attributes
|
|
* @{
|
|
*/
|
|
|
|
/** Custom Diffie-Hellman group.
|
|
*
|
|
* For keys of type #PSA_KEY_TYPE_DH_PUBLIC_KEY(#PSA_DH_GROUP_CUSTOM) or
|
|
* #PSA_KEY_TYPE_DH_KEY_PAIR(#PSA_DH_GROUP_CUSTOM), the group data comes
|
|
* from domain parameters set by psa_set_key_domain_parameters().
|
|
*/
|
|
/* This value is reserved for private use in the TLS named group registry. */
|
|
#define PSA_DH_GROUP_CUSTOM ((psa_dh_group_t) 0x01fc)
|
|
|
|
|
|
/**
|
|
* \brief Set domain parameters for a key.
|
|
*
|
|
* Some key types require additional domain parameters in addition to
|
|
* the key type identifier and the key size. Use this function instead
|
|
* of psa_set_key_type() when you need to specify domain parameters.
|
|
*
|
|
* The format for the required domain parameters varies based on the key type.
|
|
*
|
|
* - For RSA keys (#PSA_KEY_TYPE_RSA_PUBLIC_KEY or #PSA_KEY_TYPE_RSA_KEY_PAIR),
|
|
* the domain parameter data consists of the public exponent,
|
|
* represented as a big-endian integer with no leading zeros.
|
|
* This information is used when generating an RSA key pair.
|
|
* When importing a key, the public exponent is read from the imported
|
|
* key data and the exponent recorded in the attribute structure is ignored.
|
|
* As an exception, the public exponent 65537 is represented by an empty
|
|
* byte string.
|
|
* - For DSA keys (#PSA_KEY_TYPE_DSA_PUBLIC_KEY or #PSA_KEY_TYPE_DSA_KEY_PAIR),
|
|
* the `Dss-Parms` format as defined by RFC 3279 §2.3.2.
|
|
* ```
|
|
* Dss-Parms ::= SEQUENCE {
|
|
* p INTEGER,
|
|
* q INTEGER,
|
|
* g INTEGER
|
|
* }
|
|
* ```
|
|
* - For Diffie-Hellman key exchange keys
|
|
* (#PSA_KEY_TYPE_DH_PUBLIC_KEY(#PSA_DH_GROUP_CUSTOM) or
|
|
* #PSA_KEY_TYPE_DH_KEY_PAIR(#PSA_DH_GROUP_CUSTOM)), the
|
|
* `DomainParameters` format as defined by RFC 3279 §2.3.3.
|
|
* ```
|
|
* DomainParameters ::= SEQUENCE {
|
|
* p INTEGER, -- odd prime, p=jq +1
|
|
* g INTEGER, -- generator, g
|
|
* q INTEGER, -- factor of p-1
|
|
* j INTEGER OPTIONAL, -- subgroup factor
|
|
* validationParms ValidationParms OPTIONAL
|
|
* }
|
|
* ValidationParms ::= SEQUENCE {
|
|
* seed BIT STRING,
|
|
* pgenCounter INTEGER
|
|
* }
|
|
* ```
|
|
*
|
|
* \note This function may allocate memory or other resources.
|
|
* Once you have called this function on an attribute structure,
|
|
* you must call psa_reset_key_attributes() to free these resources.
|
|
*
|
|
* \note This is an experimental extension to the interface. It may change
|
|
* in future versions of the library.
|
|
*
|
|
* \param[in,out] attributes Attribute structure where the specified domain
|
|
* parameters will be stored.
|
|
* If this function fails, the content of
|
|
* \p attributes is not modified.
|
|
* \param type Key type (a \c PSA_KEY_TYPE_XXX value).
|
|
* \param[in] data Buffer containing the key domain parameters.
|
|
* The content of this buffer is interpreted
|
|
* according to \p type as described above.
|
|
* \param data_length Size of the \p data buffer in bytes.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* \retval #PSA_ERROR_INVALID_ARGUMENT
|
|
* \retval #PSA_ERROR_NOT_SUPPORTED
|
|
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
|
|
*/
|
|
psa_status_t psa_set_key_domain_parameters(psa_key_attributes_t *attributes,
|
|
psa_key_type_t type,
|
|
const uint8_t *data,
|
|
size_t data_length);
|
|
|
|
/**
|
|
* \brief Get domain parameters for a key.
|
|
*
|
|
* Get the domain parameters for a key with this function, if any. The format
|
|
* of the domain parameters written to \p data is specified in the
|
|
* documentation for psa_set_key_domain_parameters().
|
|
*
|
|
* \note This is an experimental extension to the interface. It may change
|
|
* in future versions of the library.
|
|
*
|
|
* \param[in] attributes The key attribute structure to query.
|
|
* \param[out] data On success, the key domain parameters.
|
|
* \param data_size Size of the \p data buffer in bytes.
|
|
* The buffer is guaranteed to be large
|
|
* enough if its size in bytes is at least
|
|
* the value given by
|
|
* PSA_KEY_DOMAIN_PARAMETERS_SIZE().
|
|
* \param[out] data_length On success, the number of bytes
|
|
* that make up the key domain parameters data.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
|
|
*/
|
|
psa_status_t psa_get_key_domain_parameters(
|
|
const psa_key_attributes_t *attributes,
|
|
uint8_t *data,
|
|
size_t data_size,
|
|
size_t *data_length);
|
|
|
|
/** Safe output buffer size for psa_get_key_domain_parameters().
|
|
*
|
|
* This macro returns a compile-time constant if its arguments are
|
|
* compile-time constants.
|
|
*
|
|
* \warning This function may call its arguments multiple times or
|
|
* zero times, so you should not pass arguments that contain
|
|
* side effects.
|
|
*
|
|
* \note This is an experimental extension to the interface. It may change
|
|
* in future versions of the library.
|
|
*
|
|
* \param key_type A supported key type.
|
|
* \param key_bits The size of the key in bits.
|
|
*
|
|
* \return If the parameters are valid and supported, return
|
|
* a buffer size in bytes that guarantees that
|
|
* psa_get_key_domain_parameters() will not fail with
|
|
* #PSA_ERROR_BUFFER_TOO_SMALL.
|
|
* If the parameters are a valid combination that is not supported
|
|
* by the implementation, this macro shall return either a
|
|
* sensible size or 0.
|
|
* If the parameters are not valid, the
|
|
* return value is unspecified.
|
|
*/
|
|
#define PSA_KEY_DOMAIN_PARAMETERS_SIZE(key_type, key_bits) \
|
|
(PSA_KEY_TYPE_IS_RSA(key_type) ? sizeof(int) : \
|
|
PSA_KEY_TYPE_IS_DH(key_type) ? PSA_DH_KEY_DOMAIN_PARAMETERS_SIZE(key_bits) : \
|
|
PSA_KEY_TYPE_IS_DSA(key_type) ? PSA_DSA_KEY_DOMAIN_PARAMETERS_SIZE(key_bits) : \
|
|
0)
|
|
#define PSA_DH_KEY_DOMAIN_PARAMETERS_SIZE(key_bits) \
|
|
(4 + (PSA_BITS_TO_BYTES(key_bits) + 5) * 3 /*without optional parts*/)
|
|
#define PSA_DSA_KEY_DOMAIN_PARAMETERS_SIZE(key_bits) \
|
|
(4 + (PSA_BITS_TO_BYTES(key_bits) + 5) * 2 /*p, g*/ + 34 /*q*/)
|
|
|
|
/**@}*/
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* PSA_CRYPTO_EXTRA_H */
|