609 lines
24 KiB
C
609 lines
24 KiB
C
/*
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* PSA crypto core internal interfaces
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*/
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/*
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* Copyright The Mbed TLS Contributors
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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_CORE_H
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#define PSA_CRYPTO_CORE_H
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#include "mbedtls/build_info.h"
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#include "psa/crypto.h"
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#include "psa/crypto_se_driver.h"
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/** Constant-time buffer comparison
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*
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* \param[in] a Left-hand buffer for comparison.
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* \param[in] b Right-hand buffer for comparison.
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* \param n Amount of bytes to compare.
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*
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* \return 0 if the buffer contents are equal, non-zero otherwise
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*/
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static inline int mbedtls_psa_safer_memcmp(
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const uint8_t *a, const uint8_t *b, size_t n)
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{
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size_t i;
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unsigned char diff = 0;
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for (i = 0; i < n; i++) {
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diff |= a[i] ^ b[i];
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}
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return diff;
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}
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/** The data structure representing a key slot, containing key material
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* and metadata for one key.
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*/
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typedef struct {
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psa_core_key_attributes_t attr;
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/*
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* Number of locks on the key slot held by the library.
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*
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* This counter is incremented by one each time a library function
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* retrieves through one of the dedicated internal API a pointer to the
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* key slot.
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*
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* This counter is decremented by one each time a library function stops
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* accessing the key slot and states it by calling the
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* psa_unlock_key_slot() API.
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*
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* This counter is used to prevent resetting the key slot while the library
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* may access it. For example, such control is needed in the following
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* scenarios:
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* . In case of key slot starvation, all key slots contain the description
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* of a key, and the library asks for the description of a persistent
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* key not present in the key slots, the key slots currently accessed by
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* the library cannot be reclaimed to free a key slot to load the
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* persistent key.
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* . In case of a multi-threaded application where one thread asks to close
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* or purge or destroy a key while it is in used by the library through
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* another thread.
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*/
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size_t lock_count;
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/* Dynamically allocated key data buffer.
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* Format as specified in psa_export_key(). */
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struct key_data {
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uint8_t *data;
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size_t bytes;
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} key;
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} psa_key_slot_t;
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/* A mask of key attribute flags used only internally.
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* Currently there aren't any. */
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#define PSA_KA_MASK_INTERNAL_ONLY ( \
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0)
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/** Test whether a key slot is occupied.
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*
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* A key slot is occupied iff the key type is nonzero. This works because
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* no valid key can have 0 as its key type.
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*
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* \param[in] slot The key slot to test.
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*
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* \return 1 if the slot is occupied, 0 otherwise.
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*/
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static inline int psa_is_key_slot_occupied(const psa_key_slot_t *slot)
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{
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return slot->attr.type != 0;
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}
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/** Test whether a key slot is locked.
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*
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* A key slot is locked iff its lock counter is strictly greater than 0.
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*
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* \param[in] slot The key slot to test.
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*
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* \return 1 if the slot is locked, 0 otherwise.
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*/
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static inline int psa_is_key_slot_locked(const psa_key_slot_t *slot)
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{
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return slot->lock_count > 0;
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}
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/** Retrieve flags from psa_key_slot_t::attr::core::flags.
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*
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* \param[in] slot The key slot to query.
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* \param mask The mask of bits to extract.
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*
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* \return The key attribute flags in the given slot,
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* bitwise-anded with \p mask.
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*/
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static inline uint16_t psa_key_slot_get_flags(const psa_key_slot_t *slot,
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uint16_t mask)
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{
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return slot->attr.flags & mask;
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}
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/** Set flags in psa_key_slot_t::attr::core::flags.
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*
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* \param[in,out] slot The key slot to modify.
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* \param mask The mask of bits to modify.
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* \param value The new value of the selected bits.
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*/
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static inline void psa_key_slot_set_flags(psa_key_slot_t *slot,
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uint16_t mask,
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uint16_t value)
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{
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slot->attr.flags = ((~mask & slot->attr.flags) |
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(mask & value));
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}
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/** Turn on flags in psa_key_slot_t::attr::core::flags.
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*
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* \param[in,out] slot The key slot to modify.
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* \param mask The mask of bits to set.
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*/
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static inline void psa_key_slot_set_bits_in_flags(psa_key_slot_t *slot,
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uint16_t mask)
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{
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slot->attr.flags |= mask;
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}
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/** Turn off flags in psa_key_slot_t::attr::core::flags.
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*
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* \param[in,out] slot The key slot to modify.
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* \param mask The mask of bits to clear.
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*/
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static inline void psa_key_slot_clear_bits(psa_key_slot_t *slot,
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uint16_t mask)
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{
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slot->attr.flags &= ~mask;
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}
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#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
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/** Get the SE slot number of a key from the key slot storing its description.
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*
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* \param[in] slot The key slot to query. This must be a key slot storing
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* the description of a key of a dynamically registered
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* secure element, otherwise the behaviour is undefined.
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*/
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static inline psa_key_slot_number_t psa_key_slot_get_slot_number(
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const psa_key_slot_t *slot)
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{
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return *((psa_key_slot_number_t *) (slot->key.data));
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}
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#endif
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/** Get the description of a key given its identifier and policy constraints
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* and lock it.
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*
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* The key must have allow all the usage flags set in \p usage. If \p alg is
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* nonzero, the key must allow operations with this algorithm. If \p alg is
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* zero, the algorithm is not checked.
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*
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* In case of a persistent key, the function loads the description of the key
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* into a key slot if not already done.
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*
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* On success, the returned key slot is locked. It is the responsibility of
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* the caller to unlock the key slot when it does not access it anymore.
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*/
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psa_status_t psa_get_and_lock_key_slot_with_policy(mbedtls_svc_key_id_t key,
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psa_key_slot_t **p_slot,
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psa_key_usage_t usage,
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psa_algorithm_t alg);
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/** Completely wipe a slot in memory, including its policy.
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*
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* Persistent storage is not affected.
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*
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* \param[in,out] slot The key slot to wipe.
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*
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* \retval #PSA_SUCCESS
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* Success. This includes the case of a key slot that was
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* already fully wiped.
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* \retval #PSA_ERROR_CORRUPTION_DETECTED
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*/
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psa_status_t psa_wipe_key_slot(psa_key_slot_t *slot);
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/** Try to allocate a buffer to an empty key slot.
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*
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* \param[in,out] slot Key slot to attach buffer to.
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* \param[in] buffer_length Requested size of the buffer.
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*
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* \retval #PSA_SUCCESS
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* The buffer has been successfully allocated.
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* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
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* Not enough memory was available for allocation.
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* \retval #PSA_ERROR_ALREADY_EXISTS
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* Trying to allocate a buffer to a non-empty key slot.
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*/
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psa_status_t psa_allocate_buffer_to_slot(psa_key_slot_t *slot,
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size_t buffer_length);
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/** Wipe key data from a slot. Preserves metadata such as the policy. */
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psa_status_t psa_remove_key_data_from_memory(psa_key_slot_t *slot);
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/** Copy key data (in export format) into an empty key slot.
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*
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* This function assumes that the slot does not contain
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* any key material yet. On failure, the slot content is unchanged.
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*
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* \param[in,out] slot Key slot to copy the key into.
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* \param[in] data Buffer containing the key material.
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* \param data_length Size of the key buffer.
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*
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* \retval #PSA_SUCCESS
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* The key has been copied successfully.
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* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
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* Not enough memory was available for allocation of the
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* copy buffer.
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* \retval #PSA_ERROR_ALREADY_EXISTS
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* There was other key material already present in the slot.
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*/
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psa_status_t psa_copy_key_material_into_slot(psa_key_slot_t *slot,
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const uint8_t *data,
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size_t data_length);
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/** Convert an mbed TLS error code to a PSA error code
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*
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* \note This function is provided solely for the convenience of
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* Mbed TLS and may be removed at any time without notice.
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*
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* \param ret An mbed TLS-thrown error code
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*
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* \return The corresponding PSA error code
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*/
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psa_status_t mbedtls_to_psa_error(int ret);
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/** Import a key in binary format.
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*
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* \note The signature of this function is that of a PSA driver
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* import_key entry point. This function behaves as an import_key
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* entry point as defined in the PSA driver interface specification for
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* transparent drivers.
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*
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* \param[in] attributes The attributes for the key to import.
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* \param[in] data The buffer containing the key data in import
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* format.
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* \param[in] data_length Size of the \p data buffer in bytes.
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* \param[out] key_buffer The buffer to contain the key data in output
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* format upon successful return.
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* \param[in] key_buffer_size Size of the \p key_buffer buffer in bytes. This
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* size is greater or equal to \p data_length.
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* \param[out] key_buffer_length The length of the data written in \p
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* key_buffer in bytes.
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* \param[out] bits The key size in number of bits.
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*
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* \retval #PSA_SUCCESS The key was imported successfully.
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* The key data is not correctly formatted.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
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* \retval #PSA_ERROR_CORRUPTION_DETECTED
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*/
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psa_status_t psa_import_key_into_slot(
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const psa_key_attributes_t *attributes,
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const uint8_t *data, size_t data_length,
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uint8_t *key_buffer, size_t key_buffer_size,
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size_t *key_buffer_length, size_t *bits);
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/** Export a key in binary format
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*
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* \note The signature of this function is that of a PSA driver export_key
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* entry point. This function behaves as an export_key entry point as
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* defined in the PSA driver interface specification.
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*
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* \param[in] attributes The attributes for the key to export.
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* \param[in] key_buffer Material or context of the key to export.
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* \param[in] key_buffer_size Size of the \p key_buffer buffer in bytes.
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* \param[out] data Buffer where the key data is to be written.
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* \param[in] data_size Size of the \p data buffer in bytes.
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* \param[out] data_length On success, the number of bytes written in
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* \p data
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*
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* \retval #PSA_SUCCESS The key was exported successfully.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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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_STORAGE_FAILURE
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* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
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*/
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psa_status_t psa_export_key_internal(
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const psa_key_attributes_t *attributes,
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const uint8_t *key_buffer, size_t key_buffer_size,
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uint8_t *data, size_t data_size, size_t *data_length);
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/** Export a public key or the public part of a key pair in binary format.
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*
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* \note The signature of this function is that of a PSA driver
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* export_public_key entry point. This function behaves as an
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* export_public_key entry point as defined in the PSA driver interface
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* specification.
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*
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* \param[in] attributes The attributes for the key to export.
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* \param[in] key_buffer Material or context of the key to export.
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* \param[in] key_buffer_size Size of the \p key_buffer buffer in bytes.
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* \param[out] data Buffer where the key data is to be written.
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* \param[in] data_size Size of the \p data buffer in bytes.
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* \param[out] data_length On success, the number of bytes written in
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* \p data
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*
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* \retval #PSA_SUCCESS The public key was exported successfully.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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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_STORAGE_FAILURE
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* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
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*/
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psa_status_t psa_export_public_key_internal(
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const psa_key_attributes_t *attributes,
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const uint8_t *key_buffer, size_t key_buffer_size,
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uint8_t *data, size_t data_size, size_t *data_length);
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/**
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* \brief Generate a key.
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*
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* \note The signature of the function is that of a PSA driver generate_key
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* entry point.
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*
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* \param[in] attributes The attributes for the key to generate.
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* \param[out] key_buffer Buffer where the key data is to be written.
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* \param[in] key_buffer_size Size of \p key_buffer in bytes.
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* \param[out] key_buffer_length On success, the number of bytes written in
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* \p key_buffer.
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*
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* \retval #PSA_SUCCESS
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* The key was generated successfully.
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* Key size in bits or type not supported.
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* \retval #PSA_ERROR_BUFFER_TOO_SMALL
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* The size of \p key_buffer is too small.
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*/
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psa_status_t psa_generate_key_internal(const psa_key_attributes_t *attributes,
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uint8_t *key_buffer,
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size_t key_buffer_size,
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size_t *key_buffer_length);
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/** Sign a message with a private key. For hash-and-sign algorithms,
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* this includes the hashing step.
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*
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* \note The signature of this function is that of a PSA driver
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* sign_message entry point. This function behaves as a sign_message
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* entry point as defined in the PSA driver interface specification for
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* transparent drivers.
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*
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* \note This function will call the driver for psa_sign_hash
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* and go through driver dispatch again.
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*
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* \param[in] attributes The attributes of the key to use for the
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* operation.
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* \param[in] key_buffer The buffer containing the key context.
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* \param[in] key_buffer_size Size of the \p key_buffer buffer in bytes.
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* \param[in] alg A signature algorithm that is compatible with
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* the type of the key.
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* \param[in] input The input message to sign.
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* \param[in] input_length Size of the \p input buffer in bytes.
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* \param[out] 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] 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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* \retval #PSA_ERROR_BUFFER_TOO_SMALL
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* The size of the \p signature buffer is too small. You can
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* determine a sufficient buffer size by calling
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* #PSA_SIGN_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg)
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* where \c key_type and \c key_bits are the type and bit-size
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* respectively of the key.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
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* \retval #PSA_ERROR_CORRUPTION_DETECTED
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* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
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*/
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psa_status_t psa_sign_message_builtin(
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const psa_key_attributes_t *attributes,
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const uint8_t *key_buffer, size_t key_buffer_size,
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psa_algorithm_t alg, const uint8_t *input, size_t input_length,
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uint8_t *signature, size_t signature_size, size_t *signature_length);
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/** Verify the signature of a message with a public key, using
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* a hash-and-sign verification algorithm.
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*
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* \note The signature of this function is that of a PSA driver
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* verify_message entry point. This function behaves as a verify_message
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* entry point as defined in the PSA driver interface specification for
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* transparent drivers.
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*
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* \note This function will call the driver for psa_verify_hash
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* and go through driver dispatch again.
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*
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* \param[in] attributes The attributes of the key to use for the
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* operation.
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* \param[in] key_buffer The buffer containing the key context.
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* \param[in] key_buffer_size Size of the \p key_buffer buffer in bytes.
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* \param[in] alg A signature algorithm that is compatible with
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* the type of the key.
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* \param[in] input The message whose signature is to be verified.
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* \param[in] input_length Size of the \p input buffer in bytes.
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* \param[in] signature Buffer containing the signature to verify.
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* \param[in] signature_length Size of the \p signature buffer in bytes.
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*
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* \retval #PSA_SUCCESS
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* The signature is valid.
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* \retval #PSA_ERROR_INVALID_SIGNATURE
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* The calculation was performed successfully, but the passed
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* signature is not a valid signature.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
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*/
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psa_status_t psa_verify_message_builtin(
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const psa_key_attributes_t *attributes,
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const uint8_t *key_buffer, size_t key_buffer_size,
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psa_algorithm_t alg, const uint8_t *input, size_t input_length,
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const uint8_t *signature, size_t signature_length);
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/** Sign an already-calculated hash with a private key.
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*
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* \note The signature of this function is that of a PSA driver
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|
* sign_hash entry point. This function behaves as a sign_hash
|
|
* entry point as defined in the PSA driver interface specification for
|
|
* transparent drivers.
|
|
*
|
|
* \param[in] attributes The attributes of the key to use for the
|
|
* operation.
|
|
* \param[in] key_buffer The buffer containing the key context.
|
|
* \param[in] key_buffer_size Size of the \p key_buffer buffer in bytes.
|
|
* \param[in] alg A signature algorithm that is compatible with
|
|
* the type of the key.
|
|
* \param[in] hash The hash or message to sign.
|
|
* \param[in] hash_length Size of the \p hash buffer in bytes.
|
|
* \param[out] signature Buffer where the signature is to be written.
|
|
* \param[in] signature_size Size of the \p signature buffer in bytes.
|
|
* \param[out] signature_length On success, the number of bytes
|
|
* that make up the returned signature value.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
|
|
* The size of the \p signature buffer is too small. You can
|
|
* determine a sufficient buffer size by calling
|
|
* #PSA_SIGN_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg)
|
|
* where \c key_type and \c key_bits are the type and bit-size
|
|
* respectively of the key.
|
|
* \retval #PSA_ERROR_NOT_SUPPORTED
|
|
* \retval #PSA_ERROR_INVALID_ARGUMENT
|
|
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
|
|
* \retval #PSA_ERROR_CORRUPTION_DETECTED
|
|
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
|
|
*/
|
|
psa_status_t psa_sign_hash_builtin(
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *key_buffer, size_t key_buffer_size,
|
|
psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
|
|
uint8_t *signature, size_t signature_size, size_t *signature_length);
|
|
|
|
/**
|
|
* \brief Verify the signature a hash or short message using a public key.
|
|
*
|
|
* \note The signature of this function is that of a PSA driver
|
|
* verify_hash entry point. This function behaves as a verify_hash
|
|
* entry point as defined in the PSA driver interface specification for
|
|
* transparent drivers.
|
|
*
|
|
* \param[in] attributes The attributes of the key to use for the
|
|
* operation.
|
|
* \param[in] key_buffer The buffer containing the key context.
|
|
* \param[in] key_buffer_size Size of the \p key_buffer buffer in bytes.
|
|
* \param[in] alg A signature algorithm that is compatible with
|
|
* the type of the key.
|
|
* \param[in] hash The hash or message whose signature is to be
|
|
* verified.
|
|
* \param[in] hash_length Size of the \p hash buffer in bytes.
|
|
* \param[in] signature Buffer containing the signature to verify.
|
|
* \param[in] signature_length Size of the \p signature buffer in bytes.
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* The signature is valid.
|
|
* \retval #PSA_ERROR_INVALID_SIGNATURE
|
|
* The calculation was performed successfully, but the passed
|
|
* signature is not a valid signature.
|
|
* \retval #PSA_ERROR_NOT_SUPPORTED
|
|
* \retval #PSA_ERROR_INVALID_ARGUMENT
|
|
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
|
|
*/
|
|
psa_status_t psa_verify_hash_builtin(
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *key_buffer, size_t key_buffer_size,
|
|
psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
|
|
const uint8_t *signature, size_t signature_length);
|
|
|
|
/**
|
|
* \brief Validate the key bit size for unstructured keys.
|
|
*
|
|
* \note Check that the bit size is acceptable for a given key type for
|
|
* unstructured keys.
|
|
*
|
|
* \param[in] type The key type
|
|
* \param[in] bits The number of bits of the key
|
|
*
|
|
* \retval #PSA_SUCCESS
|
|
* The key type and size are valid.
|
|
* \retval #PSA_ERROR_INVALID_ARGUMENT
|
|
* The size in bits of the key is not valid.
|
|
* \retval #PSA_ERROR_NOT_SUPPORTED
|
|
* The type and/or the size in bits of the key or the combination of
|
|
* the two is not supported.
|
|
*/
|
|
psa_status_t psa_validate_unstructured_key_bit_size(psa_key_type_t type,
|
|
size_t bits);
|
|
|
|
/** Perform a key agreement and return the raw shared secret, using
|
|
built-in raw key agreement functions.
|
|
*
|
|
* \note The signature of this function is that of a PSA driver
|
|
* key_agreement entry point. This function behaves as a key_agreement
|
|
* entry point as defined in the PSA driver interface specification for
|
|
* transparent drivers.
|
|
*
|
|
* \param[in] attributes The attributes of the key to use for the
|
|
* operation.
|
|
* \param[in] key_buffer The buffer containing the private key
|
|
* context.
|
|
* \param[in] key_buffer_size Size of the \p key_buffer buffer in
|
|
* bytes.
|
|
* \param[in] alg A key agreement algorithm that is
|
|
* compatible with the type of the key.
|
|
* \param[in] peer_key The buffer containing the key context
|
|
* of the peer's public key.
|
|
* \param[in] peer_key_length Size of the \p peer_key buffer in
|
|
* bytes.
|
|
* \param[out] shared_secret The buffer to which the shared secret
|
|
* is to be written.
|
|
* \param[in] shared_secret_size Size of the \p shared_secret buffer in
|
|
* bytes.
|
|
* \param[out] shared_secret_length On success, the number of bytes that make
|
|
* up the returned shared secret.
|
|
* \retval #PSA_SUCCESS
|
|
* Success. Shared secret successfully calculated.
|
|
* \retval #PSA_ERROR_INVALID_HANDLE
|
|
* \retval #PSA_ERROR_NOT_PERMITTED
|
|
* \retval #PSA_ERROR_INVALID_ARGUMENT
|
|
* \p alg is not a key agreement algorithm, or
|
|
* \p private_key is not compatible with \p alg,
|
|
* or \p peer_key is not valid for \p alg or not compatible with
|
|
* \p private_key.
|
|
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
|
|
* \p shared_secret_size is too small
|
|
* \retval #PSA_ERROR_NOT_SUPPORTED
|
|
* \p alg is not a supported key agreement algorithm.
|
|
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
|
|
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
|
|
* \retval #PSA_ERROR_HARDWARE_FAILURE
|
|
* \retval #PSA_ERROR_CORRUPTION_DETECTED
|
|
* \retval #PSA_ERROR_STORAGE_FAILURE
|
|
* \retval #PSA_ERROR_BAD_STATE
|
|
*/
|
|
psa_status_t psa_key_agreement_raw_builtin(
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *key_buffer,
|
|
size_t key_buffer_size,
|
|
psa_algorithm_t alg,
|
|
const uint8_t *peer_key,
|
|
size_t peer_key_length,
|
|
uint8_t *shared_secret,
|
|
size_t shared_secret_size,
|
|
size_t *shared_secret_length);
|
|
|
|
#endif /* PSA_CRYPTO_CORE_H */
|