479 lines
15 KiB
C
479 lines
15 KiB
C
/**
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* \file psa/crypto_struct.h
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*
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* \brief PSA cryptography module: Mbed TLS structured type implementations
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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 contains the definitions of some data structures with
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* implementation-specific definitions.
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*
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* In implementations with isolation between the application and the
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* cryptography module, it is expected that the front-end and the back-end
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* would have different versions of this file.
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*
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* <h3>Design notes about multipart operation structures</h3>
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*
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* For multipart operations without driver delegation support, each multipart
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* operation structure contains a `psa_algorithm_t alg` field which indicates
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* which specific algorithm the structure is for. When the structure is not in
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* use, `alg` is 0. Most of the structure consists of a union which is
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* discriminated by `alg`.
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*
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* For multipart operations with driver delegation support, each multipart
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* operation structure contains an `unsigned int id` field indicating which
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* driver got assigned to do the operation. When the structure is not in use,
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* 'id' is 0. The structure contains also a driver context which is the union
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* of the contexts of all drivers able to handle the type of multipart
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* operation.
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*
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* Note that when `alg` or `id` is 0, the content of other fields is undefined.
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* In particular, it is not guaranteed that a freshly-initialized structure
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* is all-zero: we initialize structures to something like `{0, 0}`, which
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* is only guaranteed to initializes the first member of the union;
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* GCC and Clang initialize the whole structure to 0 (at the time of writing),
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* but MSVC and CompCert don't.
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*
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* In Mbed Crypto, multipart operation structures live independently from
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* the key. This allows Mbed Crypto to free the key objects when destroying
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* a key slot. If a multipart operation needs to remember the key after
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* the setup function returns, the operation structure needs to contain a
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* copy of the key.
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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_STRUCT_H
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#define PSA_CRYPTO_STRUCT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Include the Mbed TLS configuration file, the way Mbed TLS does it
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* in each of its header files. */
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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 "mbedtls/cmac.h"
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#include "mbedtls/gcm.h"
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/* Include the context definition for the compiled-in drivers for the primitive
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* algorithms. */
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#include "psa/crypto_driver_contexts_primitives.h"
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struct psa_hash_operation_s
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{
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/** Unique ID indicating which driver got assigned to do the
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* operation. Since driver contexts are driver-specific, swapping
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* drivers halfway through the operation is not supported.
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* ID values are auto-generated in psa_driver_wrappers.h.
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* ID value zero means the context is not valid or not assigned to
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* any driver (i.e. the driver context is not active, in use). */
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unsigned int id;
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psa_driver_hash_context_t ctx;
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};
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#define PSA_HASH_OPERATION_INIT {0, {0}}
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static inline struct psa_hash_operation_s psa_hash_operation_init( void )
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{
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const struct psa_hash_operation_s v = PSA_HASH_OPERATION_INIT;
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return( v );
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}
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struct psa_cipher_operation_s
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{
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/** Unique ID indicating which driver got assigned to do the
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* operation. Since driver contexts are driver-specific, swapping
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* drivers halfway through the operation is not supported.
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* ID values are auto-generated in psa_crypto_driver_wrappers.h
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* ID value zero means the context is not valid or not assigned to
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* any driver (i.e. none of the driver contexts are active). */
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unsigned int id;
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unsigned int iv_required : 1;
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unsigned int iv_set : 1;
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uint8_t default_iv_length;
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psa_driver_cipher_context_t ctx;
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};
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#define PSA_CIPHER_OPERATION_INIT {0, 0, 0, 0, {0}}
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static inline struct psa_cipher_operation_s psa_cipher_operation_init( void )
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{
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const struct psa_cipher_operation_s v = PSA_CIPHER_OPERATION_INIT;
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return( v );
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}
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/* Include the context definition for the compiled-in drivers for the composite
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* algorithms. */
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#include "psa/crypto_driver_contexts_composites.h"
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struct psa_mac_operation_s
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{
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/** Unique ID indicating which driver got assigned to do the
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* operation. Since driver contexts are driver-specific, swapping
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* drivers halfway through the operation is not supported.
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* ID values are auto-generated in psa_driver_wrappers.h
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* ID value zero means the context is not valid or not assigned to
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* any driver (i.e. none of the driver contexts are active). */
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unsigned int id;
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uint8_t mac_size;
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unsigned int is_sign : 1;
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psa_driver_mac_context_t ctx;
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};
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#define PSA_MAC_OPERATION_INIT {0, 0, 0, {0}}
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static inline struct psa_mac_operation_s psa_mac_operation_init( void )
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{
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const struct psa_mac_operation_s v = PSA_MAC_OPERATION_INIT;
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return( v );
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}
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struct psa_aead_operation_s
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{
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psa_algorithm_t alg;
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unsigned int key_set : 1;
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unsigned int iv_set : 1;
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uint8_t iv_size;
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uint8_t block_size;
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union
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{
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unsigned dummy; /* Enable easier initializing of the union. */
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mbedtls_cipher_context_t cipher;
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} ctx;
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};
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#define PSA_AEAD_OPERATION_INIT {0, 0, 0, 0, 0, {0}}
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static inline struct psa_aead_operation_s psa_aead_operation_init( void )
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{
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const struct psa_aead_operation_s v = PSA_AEAD_OPERATION_INIT;
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return( v );
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}
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_HKDF)
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typedef struct
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{
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uint8_t *info;
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size_t info_length;
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#if PSA_HASH_MAX_SIZE > 0xff
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#error "PSA_HASH_MAX_SIZE does not fit in uint8_t"
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#endif
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uint8_t offset_in_block;
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uint8_t block_number;
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unsigned int state : 2;
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unsigned int info_set : 1;
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uint8_t output_block[PSA_HASH_MAX_SIZE];
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uint8_t prk[PSA_HASH_MAX_SIZE];
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struct psa_mac_operation_s hmac;
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} psa_hkdf_key_derivation_t;
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_HKDF */
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) || \
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defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
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typedef enum
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{
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PSA_TLS12_PRF_STATE_INIT, /* no input provided */
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PSA_TLS12_PRF_STATE_SEED_SET, /* seed has been set */
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PSA_TLS12_PRF_STATE_KEY_SET, /* key has been set */
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PSA_TLS12_PRF_STATE_LABEL_SET, /* label has been set */
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PSA_TLS12_PRF_STATE_OUTPUT /* output has been started */
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} psa_tls12_prf_key_derivation_state_t;
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typedef struct psa_tls12_prf_key_derivation_s
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{
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#if PSA_HASH_MAX_SIZE > 0xff
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#error "PSA_HASH_MAX_SIZE does not fit in uint8_t"
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#endif
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/* Indicates how many bytes in the current HMAC block have
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* not yet been read by the user. */
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uint8_t left_in_block;
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/* The 1-based number of the block. */
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uint8_t block_number;
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psa_tls12_prf_key_derivation_state_t state;
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uint8_t *secret;
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size_t secret_length;
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uint8_t *seed;
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size_t seed_length;
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uint8_t *label;
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size_t label_length;
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uint8_t Ai[PSA_HASH_MAX_SIZE];
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/* `HMAC_hash( prk, A(i) + seed )` in the notation of RFC 5246, Sect. 5. */
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uint8_t output_block[PSA_HASH_MAX_SIZE];
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} psa_tls12_prf_key_derivation_t;
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) ||
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* MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS */
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struct psa_key_derivation_s
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{
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psa_algorithm_t alg;
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unsigned int can_output_key : 1;
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size_t capacity;
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union
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{
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/* Make the union non-empty even with no supported algorithms. */
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uint8_t dummy;
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_HKDF)
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psa_hkdf_key_derivation_t hkdf;
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#endif
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) || \
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defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
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psa_tls12_prf_key_derivation_t tls12_prf;
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#endif
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} ctx;
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};
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/* This only zeroes out the first byte in the union, the rest is unspecified. */
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#define PSA_KEY_DERIVATION_OPERATION_INIT {0, 0, 0, {0}}
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static inline struct psa_key_derivation_s psa_key_derivation_operation_init( void )
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{
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const struct psa_key_derivation_s v = PSA_KEY_DERIVATION_OPERATION_INIT;
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return( v );
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}
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struct psa_key_policy_s
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{
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psa_key_usage_t usage;
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psa_algorithm_t alg;
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psa_algorithm_t alg2;
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};
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typedef struct psa_key_policy_s psa_key_policy_t;
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#define PSA_KEY_POLICY_INIT {0, 0, 0}
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static inline struct psa_key_policy_s psa_key_policy_init( void )
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{
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const struct psa_key_policy_s v = PSA_KEY_POLICY_INIT;
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return( v );
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}
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/* The type used internally for key sizes.
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* Public interfaces use size_t, but internally we use a smaller type. */
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typedef uint16_t psa_key_bits_t;
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/* The maximum value of the type used to represent bit-sizes.
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* This is used to mark an invalid key size. */
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#define PSA_KEY_BITS_TOO_LARGE ( (psa_key_bits_t) ( -1 ) )
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/* The maximum size of a key in bits.
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* Currently defined as the maximum that can be represented, rounded down
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* to a whole number of bytes.
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* This is an uncast value so that it can be used in preprocessor
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* conditionals. */
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#define PSA_MAX_KEY_BITS 0xfff8
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/** A mask of flags that can be stored in key attributes.
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*
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* This type is also used internally to store flags in slots. Internal
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* flags are defined in library/psa_crypto_core.h. Internal flags may have
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* the same value as external flags if they are properly handled during
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* key creation and in psa_get_key_attributes.
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*/
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typedef uint16_t psa_key_attributes_flag_t;
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#define MBEDTLS_PSA_KA_FLAG_HAS_SLOT_NUMBER \
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( (psa_key_attributes_flag_t) 0x0001 )
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/* A mask of key attribute flags used externally only.
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* Only meant for internal checks inside the library. */
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#define MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY ( \
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MBEDTLS_PSA_KA_FLAG_HAS_SLOT_NUMBER | \
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0 )
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/* A mask of key attribute flags used both internally and externally.
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* Currently there aren't any. */
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#define MBEDTLS_PSA_KA_MASK_DUAL_USE ( \
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0 )
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typedef struct
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{
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psa_key_type_t type;
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psa_key_bits_t bits;
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psa_key_lifetime_t lifetime;
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mbedtls_svc_key_id_t id;
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psa_key_policy_t policy;
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psa_key_attributes_flag_t flags;
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} psa_core_key_attributes_t;
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#define PSA_CORE_KEY_ATTRIBUTES_INIT {PSA_KEY_TYPE_NONE, 0, PSA_KEY_LIFETIME_VOLATILE, MBEDTLS_SVC_KEY_ID_INIT, PSA_KEY_POLICY_INIT, 0}
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struct psa_key_attributes_s
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{
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psa_core_key_attributes_t core;
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#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
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psa_key_slot_number_t slot_number;
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#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
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void *domain_parameters;
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size_t domain_parameters_size;
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};
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#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
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#define PSA_KEY_ATTRIBUTES_INIT {PSA_CORE_KEY_ATTRIBUTES_INIT, 0, NULL, 0}
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#else
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#define PSA_KEY_ATTRIBUTES_INIT {PSA_CORE_KEY_ATTRIBUTES_INIT, NULL, 0}
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#endif
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static inline struct psa_key_attributes_s psa_key_attributes_init( void )
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{
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const struct psa_key_attributes_s v = PSA_KEY_ATTRIBUTES_INIT;
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return( v );
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}
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static inline void psa_set_key_id( psa_key_attributes_t *attributes,
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mbedtls_svc_key_id_t key )
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{
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psa_key_lifetime_t lifetime = attributes->core.lifetime;
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attributes->core.id = key;
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if( PSA_KEY_LIFETIME_IS_VOLATILE( lifetime ) )
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{
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attributes->core.lifetime =
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PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(
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PSA_KEY_LIFETIME_PERSISTENT,
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PSA_KEY_LIFETIME_GET_LOCATION( lifetime ) );
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}
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}
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static inline mbedtls_svc_key_id_t psa_get_key_id(
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const psa_key_attributes_t *attributes)
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{
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return( attributes->core.id );
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}
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#ifdef MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER
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static inline void mbedtls_set_key_owner_id( psa_key_attributes_t *attributes,
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mbedtls_key_owner_id_t owner )
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{
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attributes->core.id.owner = owner;
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}
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#endif
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static inline void psa_set_key_lifetime(psa_key_attributes_t *attributes,
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psa_key_lifetime_t lifetime)
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{
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attributes->core.lifetime = lifetime;
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if( PSA_KEY_LIFETIME_IS_VOLATILE( lifetime ) )
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{
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#ifdef MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER
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attributes->core.id.key_id = 0;
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#else
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attributes->core.id = 0;
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#endif
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}
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}
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static inline psa_key_lifetime_t psa_get_key_lifetime(
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const psa_key_attributes_t *attributes)
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{
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return( attributes->core.lifetime );
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}
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static inline void psa_extend_key_usage_flags( psa_key_usage_t *usage_flags )
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{
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if( *usage_flags & PSA_KEY_USAGE_SIGN_HASH )
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*usage_flags |= PSA_KEY_USAGE_SIGN_MESSAGE;
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if( *usage_flags & PSA_KEY_USAGE_VERIFY_HASH )
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*usage_flags |= PSA_KEY_USAGE_VERIFY_MESSAGE;
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}
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static inline void psa_set_key_usage_flags(psa_key_attributes_t *attributes,
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psa_key_usage_t usage_flags)
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{
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psa_extend_key_usage_flags( &usage_flags );
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attributes->core.policy.usage = usage_flags;
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}
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static inline psa_key_usage_t psa_get_key_usage_flags(
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const psa_key_attributes_t *attributes)
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{
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return( attributes->core.policy.usage );
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}
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static inline void psa_set_key_algorithm(psa_key_attributes_t *attributes,
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psa_algorithm_t alg)
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{
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attributes->core.policy.alg = alg;
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}
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static inline psa_algorithm_t psa_get_key_algorithm(
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const psa_key_attributes_t *attributes)
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{
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return( attributes->core.policy.alg );
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}
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/* This function is declared in crypto_extra.h, which comes after this
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* header file, but we need the function here, so repeat the declaration. */
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psa_status_t psa_set_key_domain_parameters(psa_key_attributes_t *attributes,
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psa_key_type_t type,
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const uint8_t *data,
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size_t data_length);
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static inline void psa_set_key_type(psa_key_attributes_t *attributes,
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psa_key_type_t type)
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{
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if( attributes->domain_parameters == NULL )
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{
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/* Common case: quick path */
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attributes->core.type = type;
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}
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else
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{
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/* Call the bigger function to free the old domain paramteres.
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* Ignore any errors which may arise due to type requiring
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* non-default domain parameters, since this function can't
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* report errors. */
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(void) psa_set_key_domain_parameters( attributes, type, NULL, 0 );
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}
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}
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static inline psa_key_type_t psa_get_key_type(
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const psa_key_attributes_t *attributes)
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{
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return( attributes->core.type );
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}
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static inline void psa_set_key_bits(psa_key_attributes_t *attributes,
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size_t bits)
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{
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if( bits > PSA_MAX_KEY_BITS )
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attributes->core.bits = PSA_KEY_BITS_TOO_LARGE;
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else
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attributes->core.bits = (psa_key_bits_t) bits;
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}
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static inline size_t psa_get_key_bits(
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const psa_key_attributes_t *attributes)
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{
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return( attributes->core.bits );
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* PSA_CRYPTO_STRUCT_H */
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