Mbed OS Reference | crypto_struct.h Source File

 /*
  * Copyright (c) 2018-2020, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  *
  */
 /**
  * \file psa/crypto_struct.h
  *
  * \brief PSA cryptography module: structured type implementations
  *
  * \note This file may not be included directly. Applications must
  * include psa/crypto.h.
  *
  * This file contains the definitions of some data structures with
  * implementation-specific definitions.
  *
  * In implementations with isolation between the application and the
  * cryptography module, it is expected that the front-end and the back-end
  * would have different versions of this file.
  */
 
 #ifndef PSA_CRYPTO_STRUCT_H
 #define PSA_CRYPTO_STRUCT_H
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /*
  * Note that the below structures are different from the decalrations in
  * mbed-crypto. This is because TF-M maintains 'front-end' and 'back-end'
  * versions of this header. In the front-end version, exported to NS
  * clients in interface/include/psa, a crypto operation is defined as an
  * opaque handle to a context in the Crypto service. The back-end
  * version, directly included from the mbed-crypto repo by the Crypto
  * service, contains the full definition of the operation structs.
  *
  * One of the functions of the Crypto service is to allocate the back-end
  * operation contexts in its own partition memory (in crypto_alloc.c),
  * and then do the mapping between front-end operation handles passed by
  * NS clients and the corresponding back-end operation contexts. The
  * advantage of doing it this way is that internal mbed-crypto state is never
  * exposed to the NS client.
  */
 
 struct psa_hash_operation_s
 {
     uint32_t handle;
 };
 
 #define PSA_HASH_OPERATION_INIT {0}
 static inline struct psa_hash_operation_s psa_hash_operation_init( void )
 {
     const struct psa_hash_operation_s v = PSA_HASH_OPERATION_INIT;
     return( v );
 }
 
 struct psa_mac_operation_s
 {
     uint32_t handle;
 };
 
 #define PSA_MAC_OPERATION_INIT {0}
 static inline struct psa_mac_operation_s psa_mac_operation_init( void )
 {
     const struct psa_mac_operation_s v = PSA_MAC_OPERATION_INIT;
     return( v );
 }
 
 struct psa_cipher_operation_s
 {
     uint32_t handle;
 };
 
 #define PSA_CIPHER_OPERATION_INIT {0}
 static inline struct psa_cipher_operation_s psa_cipher_operation_init( void )
 {
     const struct psa_cipher_operation_s v = PSA_CIPHER_OPERATION_INIT;
     return( v );
 }
 
 struct psa_aead_operation_s
 {
     uint32_t handle;
 };
 
 #define PSA_AEAD_OPERATION_INIT {0}
 static inline struct psa_aead_operation_s psa_aead_operation_init( void )
 {
     const struct psa_aead_operation_s v = PSA_AEAD_OPERATION_INIT;
     return( v );
 }
 
 struct psa_key_derivation_s
 {
     uint32_t handle;
 };
 
 #define PSA_KEY_DERIVATION_OPERATION_INIT {0}
 static inline struct psa_key_derivation_s psa_key_derivation_operation_init( void )
 {
     const struct psa_key_derivation_s v = PSA_KEY_DERIVATION_OPERATION_INIT;
     return( v );
 }
 
 /* The type used internally for key sizes.
  * Public interfaces use size_t, but internally we use a smaller type. */
 typedef uint16_t psa_key_bits_t;
 /* The maximum value of the type used to represent bit-sizes.
  * This is used to mark an invalid key size. */
 #define PSA_KEY_BITS_TOO_LARGE ( (psa_key_bits_t) ( -1 ) )
 /* The maximum size of a key in bits.
  * Currently defined as the maximum that can be represented, rounded down
  * to a whole number of bytes.
  * This is an uncast value so that it can be used in preprocessor
  * conditionals. */
 #define PSA_MAX_KEY_BITS 0xfff8
 
 #define PSA_KEY_ATTRIBUTES_INIT PSA_CLIENT_KEY_ATTRIBUTES_INIT
 
 static inline struct psa_client_key_attributes_s psa_key_attributes_init( void )
 {
     const struct psa_client_key_attributes_s v = PSA_KEY_ATTRIBUTES_INIT;
     return( v );
 }
 
 static inline void psa_set_key_id(psa_key_attributes_t *attributes,
                                   psa_key_id_t id)
 {
     attributes->id = id;
     if( attributes->lifetime == PSA_KEY_LIFETIME_VOLATILE )
         attributes->lifetime = PSA_KEY_LIFETIME_PERSISTENT;
 }
 
 static inline psa_key_id_t psa_get_key_id(
     const psa_key_attributes_t *attributes)
 {
     return( attributes->id );
 }
 
 static inline void psa_set_key_lifetime(psa_key_attributes_t *attributes,
                                         psa_key_lifetime_t lifetime)
 {
     attributes->lifetime = lifetime;
     if( lifetime == PSA_KEY_LIFETIME_VOLATILE )
     {
         attributes->id = 0;
     }
 }
 
 static inline psa_key_lifetime_t psa_get_key_lifetime(
     const psa_key_attributes_t *attributes)
 {
     return( attributes->lifetime );
 }
 
 static inline void psa_set_key_usage_flags(psa_key_attributes_t *attributes,
                                            psa_key_usage_t usage_flags)
 {
     attributes->usage = usage_flags;
 }
 
 static inline psa_key_usage_t psa_get_key_usage_flags(
     const psa_key_attributes_t *attributes)
 {
     return( attributes->usage );
 }
 
 static inline void psa_set_key_algorithm(psa_key_attributes_t *attributes,
                                          psa_algorithm_t alg)
 {
     attributes->alg = alg;
 }
 
 static inline psa_algorithm_t psa_get_key_algorithm(
     const psa_key_attributes_t *attributes)
 {
     return( attributes->alg );
 }
 
 static inline void psa_set_key_type(psa_key_attributes_t *attributes,
                                     psa_key_type_t type)
 {
     attributes->type = type;
 }
 
 static inline psa_key_type_t psa_get_key_type(
     const psa_key_attributes_t *attributes)
 {
     return( attributes->type );
 }
 
 static inline void psa_set_key_bits(psa_key_attributes_t *attributes,
                                     size_t bits)
 {
     if( bits > PSA_MAX_KEY_BITS )
         attributes->bits = PSA_KEY_BITS_TOO_LARGE;
     else
         attributes->bits = bits;
 }
 
 static inline size_t psa_get_key_bits(
     const psa_key_attributes_t *attributes)
 {
     return( attributes->bits );
 }
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif /* PSA_CRYPTO_STRUCT_H */
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