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536 lines
21 KiB
C
536 lines
21 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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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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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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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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{
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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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{
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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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/** 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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/** Get Mbed TLS cipher information given the cipher algorithm PSA identifier
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* as well as the PSA type and size of the key to be used with the cipher
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* algorithm.
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*
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* \param alg PSA cipher algorithm identifier
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* \param key_type PSA key type
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* \param key_bits Size of the key in bits
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* \param[out] cipher_id Mbed TLS cipher algorithm identifier
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*
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* \return The Mbed TLS cipher information of the cipher algorithm.
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* \c NULL if the PSA cipher algorithm is not supported.
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*/
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const mbedtls_cipher_info_t *mbedtls_cipher_info_from_psa(
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psa_algorithm_t alg, psa_key_type_t key_type, size_t key_bits,
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mbedtls_cipher_id_t *cipher_id );
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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
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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 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] hash The hash or message to sign.
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* \param[in] hash_length Size of the \p hash 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_hash_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 *hash, size_t hash_length,
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uint8_t *signature, size_t signature_size, size_t *signature_length );
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/**
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* \brief Verify the signature a hash or short message using a public 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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* verify_hash entry point. This function behaves as a verify_hash
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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 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] hash The hash or message whose signature is to be
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* verified.
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* \param[in] hash_length Size of the \p hash 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_hash_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 *hash, size_t hash_length,
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const uint8_t *signature, size_t signature_length );
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#endif /* PSA_CRYPTO_CORE_H */
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