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/**
* \file psa/crypto_struct.h
*
* \brief PSA cryptography module: Mbed TLS 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.
*
* <h3>Design notes about multipart operation structures</h3>
*
* For multipart operations without driver delegation support, each multipart
* operation structure contains a `psa_algorithm_t alg` field which indicates
* which specific algorithm the structure is for. When the structure is not in
* use, `alg` is 0. Most of the structure consists of a union which is
* discriminated by `alg`.
*
* For multipart operations with driver delegation support, each multipart
* operation structure contains an `unsigned int id` field indicating which
* driver got assigned to do the operation. When the structure is not in use,
* 'id' is 0. The structure contains also a driver context which is the union
* of the contexts of all drivers able to handle the type of multipart
* operation.
*
* Note that when `alg` or `id` is 0, the content of other fields is undefined.
* In particular, it is not guaranteed that a freshly-initialized structure
* is all-zero: we initialize structures to something like `{0, 0}`, which
* is only guaranteed to initializes the first member of the union;
* GCC and Clang initialize the whole structure to 0 (at the time of writing),
* but MSVC and CompCert don't.
*
* In Mbed TLS, multipart operation structures live independently from
* the key. This allows Mbed TLS to free the key objects when destroying
* a key slot. If a multipart operation needs to remember the key after
* the setup function returns, the operation structure needs to contain a
* copy of the key.
*/
/*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#ifndef PSA_CRYPTO_STRUCT_H
#define PSA_CRYPTO_STRUCT_H
#ifdef __cplusplus
extern "C" {
#endif
/* Include the Mbed TLS configuration file, the way Mbed TLS does it
* in each of its header files. */
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include "mbedtls/cmac.h"
#include "mbedtls/gcm.h"
/* Include the context definition for the compiled-in drivers for the primitive
* algorithms. */
#include "psa/crypto_driver_contexts_primitives.h"
struct psa_hash_operation_s {
/** Unique ID indicating which driver got assigned to do the
* operation. Since driver contexts are driver-specific, swapping
* drivers halfway through the operation is not supported.
* ID values are auto-generated in psa_driver_wrappers.h.
* ID value zero means the context is not valid or not assigned to
* any driver (i.e. the driver context is not active, in use). */
unsigned int id;
psa_driver_hash_context_t ctx;
};
#define PSA_HASH_OPERATION_INIT { 0, { 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_cipher_operation_s {
/** Unique ID indicating which driver got assigned to do the
* operation. Since driver contexts are driver-specific, swapping
* drivers halfway through the operation is not supported.
* ID values are auto-generated in psa_crypto_driver_wrappers.h
* ID value zero means the context is not valid or not assigned to
* any driver (i.e. none of the driver contexts are active). */
unsigned int id;
unsigned int iv_required : 1;
unsigned int iv_set : 1;
uint8_t default_iv_length;
psa_driver_cipher_context_t ctx;
};
#define PSA_CIPHER_OPERATION_INIT { 0, 0, 0, 0, { 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;
}
/* Include the context definition for the compiled-in drivers for the composite
* algorithms. */
#include "psa/crypto_driver_contexts_composites.h"
struct psa_mac_operation_s {
/** Unique ID indicating which driver got assigned to do the
* operation. Since driver contexts are driver-specific, swapping
* drivers halfway through the operation is not supported.
* ID values are auto-generated in psa_driver_wrappers.h
* ID value zero means the context is not valid or not assigned to
* any driver (i.e. none of the driver contexts are active). */
unsigned int id;
uint8_t mac_size;
unsigned int is_sign : 1;
psa_driver_mac_context_t ctx;
};
#define PSA_MAC_OPERATION_INIT { 0, 0, 0, { 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_aead_operation_s {
psa_algorithm_t alg;
unsigned int key_set : 1;
unsigned int iv_set : 1;
uint8_t iv_size;
uint8_t block_size;
union {
unsigned dummy; /* Enable easier initializing of the union. */
mbedtls_cipher_context_t cipher;
} ctx;
};
#define PSA_AEAD_OPERATION_INIT { 0, 0, 0, 0, 0, { 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;
}
#if defined(MBEDTLS_PSA_BUILTIN_ALG_HKDF)
typedef struct {
uint8_t *info;
size_t info_length;
#if PSA_HASH_MAX_SIZE > 0xff
#error "PSA_HASH_MAX_SIZE does not fit in uint8_t"
#endif
uint8_t offset_in_block;
uint8_t block_number;
unsigned int state : 2;
unsigned int info_set : 1;
uint8_t output_block[PSA_HASH_MAX_SIZE];
uint8_t prk[PSA_HASH_MAX_SIZE];
struct psa_mac_operation_s hmac;
} psa_hkdf_key_derivation_t;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_HKDF */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) || \
defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
typedef enum {
PSA_TLS12_PRF_STATE_INIT, /* no input provided */
PSA_TLS12_PRF_STATE_SEED_SET, /* seed has been set */
PSA_TLS12_PRF_STATE_KEY_SET, /* key has been set */
PSA_TLS12_PRF_STATE_LABEL_SET, /* label has been set */
PSA_TLS12_PRF_STATE_OUTPUT /* output has been started */
} psa_tls12_prf_key_derivation_state_t;
typedef struct psa_tls12_prf_key_derivation_s {
#if PSA_HASH_MAX_SIZE > 0xff
#error "PSA_HASH_MAX_SIZE does not fit in uint8_t"
#endif
/* Indicates how many bytes in the current HMAC block have
* not yet been read by the user. */
uint8_t left_in_block;
/* The 1-based number of the block. */
uint8_t block_number;
psa_tls12_prf_key_derivation_state_t state;
uint8_t *secret;
size_t secret_length;
uint8_t *seed;
size_t seed_length;
uint8_t *label;
size_t label_length;
uint8_t Ai[PSA_HASH_MAX_SIZE];
/* `HMAC_hash( prk, A(i) + seed )` in the notation of RFC 5246, Sect. 5. */
uint8_t output_block[PSA_HASH_MAX_SIZE];
} psa_tls12_prf_key_derivation_t;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) ||
* MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS */
struct psa_key_derivation_s {
psa_algorithm_t alg;
unsigned int can_output_key : 1;
size_t capacity;
union {
/* Make the union non-empty even with no supported algorithms. */
uint8_t dummy;
#if defined(MBEDTLS_PSA_BUILTIN_ALG_HKDF)
psa_hkdf_key_derivation_t hkdf;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) || \
defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
psa_tls12_prf_key_derivation_t tls12_prf;
#endif
} ctx;
};
/* This only zeroes out the first byte in the union, the rest is unspecified. */
#define PSA_KEY_DERIVATION_OPERATION_INIT { 0, 0, 0, { 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;
}
struct psa_key_policy_s {
psa_key_usage_t usage;
psa_algorithm_t alg;
psa_algorithm_t alg2;
};
typedef struct psa_key_policy_s psa_key_policy_t;
#define PSA_KEY_POLICY_INIT { 0, 0, 0 }
static inline struct psa_key_policy_s psa_key_policy_init(void)
{
const struct psa_key_policy_s v = PSA_KEY_POLICY_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
/** A mask of flags that can be stored in key attributes.
*
* This type is also used internally to store flags in slots. Internal
* flags are defined in library/psa_crypto_core.h. Internal flags may have
* the same value as external flags if they are properly handled during
* key creation and in psa_get_key_attributes.
*/
typedef uint16_t psa_key_attributes_flag_t;
#define MBEDTLS_PSA_KA_FLAG_HAS_SLOT_NUMBER \
((psa_key_attributes_flag_t) 0x0001)
/* A mask of key attribute flags used externally only.
* Only meant for internal checks inside the library. */
#define MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY ( \
MBEDTLS_PSA_KA_FLAG_HAS_SLOT_NUMBER | \
0)
/* A mask of key attribute flags used both internally and externally.
* Currently there aren't any. */
#define MBEDTLS_PSA_KA_MASK_DUAL_USE ( \
0)
typedef struct {
psa_key_type_t type;
psa_key_bits_t bits;
psa_key_lifetime_t lifetime;
mbedtls_svc_key_id_t id;
psa_key_policy_t policy;
psa_key_attributes_flag_t flags;
} psa_core_key_attributes_t;
#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 }
struct psa_key_attributes_s {
psa_core_key_attributes_t core;
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
psa_key_slot_number_t slot_number;
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
void *domain_parameters;
size_t domain_parameters_size;
};
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
#define PSA_KEY_ATTRIBUTES_INIT { PSA_CORE_KEY_ATTRIBUTES_INIT, 0, NULL, 0 }
#else
#define PSA_KEY_ATTRIBUTES_INIT { PSA_CORE_KEY_ATTRIBUTES_INIT, NULL, 0 }
#endif
static inline struct psa_key_attributes_s psa_key_attributes_init(void)
{
const struct psa_key_attributes_s v = PSA_KEY_ATTRIBUTES_INIT;
return v;
}
static inline void psa_set_key_id(psa_key_attributes_t *attributes,
mbedtls_svc_key_id_t key)
{
psa_key_lifetime_t lifetime = attributes->core.lifetime;
attributes->core.id = key;
if (PSA_KEY_LIFETIME_IS_VOLATILE(lifetime)) {
attributes->core.lifetime =
PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(
PSA_KEY_LIFETIME_PERSISTENT,
PSA_KEY_LIFETIME_GET_LOCATION(lifetime));
}
}
static inline mbedtls_svc_key_id_t psa_get_key_id(
const psa_key_attributes_t *attributes)
{
return attributes->core.id;
}
#ifdef MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER
static inline void mbedtls_set_key_owner_id(psa_key_attributes_t *attributes,
mbedtls_key_owner_id_t owner)
{
attributes->core.id.owner = owner;
}
#endif
static inline void psa_set_key_lifetime(psa_key_attributes_t *attributes,
psa_key_lifetime_t lifetime)
{
attributes->core.lifetime = lifetime;
if (PSA_KEY_LIFETIME_IS_VOLATILE(lifetime)) {
#ifdef MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER
attributes->core.id.key_id = 0;
#else
attributes->core.id = 0;
#endif
}
}
static inline psa_key_lifetime_t psa_get_key_lifetime(
const psa_key_attributes_t *attributes)
{
return attributes->core.lifetime;
}
static inline void psa_extend_key_usage_flags(psa_key_usage_t *usage_flags)
{
if (*usage_flags & PSA_KEY_USAGE_SIGN_HASH) {
*usage_flags |= PSA_KEY_USAGE_SIGN_MESSAGE;
}
if (*usage_flags & PSA_KEY_USAGE_VERIFY_HASH) {
*usage_flags |= PSA_KEY_USAGE_VERIFY_MESSAGE;
}
}
static inline void psa_set_key_usage_flags(psa_key_attributes_t *attributes,
psa_key_usage_t usage_flags)
{
psa_extend_key_usage_flags(&usage_flags);
attributes->core.policy.usage = usage_flags;
}
static inline psa_key_usage_t psa_get_key_usage_flags(
const psa_key_attributes_t *attributes)
{
return attributes->core.policy.usage;
}
static inline void psa_set_key_algorithm(psa_key_attributes_t *attributes,
psa_algorithm_t alg)
{
attributes->core.policy.alg = alg;
}
static inline psa_algorithm_t psa_get_key_algorithm(
const psa_key_attributes_t *attributes)
{
return attributes->core.policy.alg;
}
/* This function is declared in crypto_extra.h, which comes after this
* header file, but we need the function here, so repeat the declaration. */
psa_status_t psa_set_key_domain_parameters(psa_key_attributes_t *attributes,
psa_key_type_t type,
const uint8_t *data,
size_t data_length);
static inline void psa_set_key_type(psa_key_attributes_t *attributes,
psa_key_type_t type)
{
if (attributes->domain_parameters == NULL) {
/* Common case: quick path */
attributes->core.type = type;
} else {
/* Call the bigger function to free the old domain parameters.
* Ignore any errors which may arise due to type requiring
* non-default domain parameters, since this function can't
* report errors. */
(void) psa_set_key_domain_parameters(attributes, type, NULL, 0);
}
}
static inline psa_key_type_t psa_get_key_type(
const psa_key_attributes_t *attributes)
{
return attributes->core.type;
}
static inline void psa_set_key_bits(psa_key_attributes_t *attributes,
size_t bits)
{
if (bits > PSA_MAX_KEY_BITS) {
attributes->core.bits = PSA_KEY_BITS_TOO_LARGE;
} else {
attributes->core.bits = (psa_key_bits_t) bits;
}
}
static inline size_t psa_get_key_bits(
const psa_key_attributes_t *attributes)
{
return attributes->core.bits;
}
#ifdef __cplusplus
}
#endif
#endif /* PSA_CRYPTO_STRUCT_H */
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