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Declare a psa_key_file_id_t layout with an owner field

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Declare the owner as psa_key_owner_id_t, of which an implementation
must be provided separately.

Make this a configuration option
MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER, to make the conditional
compilation flow easier to follow. Declare it in config.h to
pacify check_names.sh.

Support for a specific implementation of psa_key_owner_id_t in storage
backends will come in a subsequent commit.
This commit is contained in:
Gilles Peskine 2019-02-19 14:00:31 +01:00
parent 5b229a06f4
commit 69d7c8b2d7
5 changed files with 46 additions and 0 deletions
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15
include/mbedtls/config.h
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@ -1156,6 +1156,21 @@
*/
//#define MBEDTLS_PSA_HAS_ITS_IO
/* MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER
*
* In PSA key storage, encode the owner of the key.
*
* This is only meaningful when building the library as part of a
* multi-client service. When you activate this option, you must provide
* an implementation of the type psa_key_owner_id_t and a translation
* from psa_key_file_id_t to file name in all the storage backends that
* you wish to support.
*
* Note that this option is meant for internal use only and may be removed
* without notice.
*/
//#define MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER
/**
* \def MBEDTLS_MEMORY_DEBUG
*

20
include/psa/crypto_platform.h
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@ -68,8 +68,28 @@ typedef uint16_t psa_key_handle_t;
* #psa_key_id_t. */
typedef uint32_t psa_app_key_id_t;
#if defined(MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER)
typedef struct
{
uint32_t key_id;
psa_key_owner_id_t owner;
} psa_key_file_id_t;
#define PSA_KEY_FILE_GET_KEY_ID( file_id ) ( ( file_id ).key_id )
/* Since crypto.h is used as part of the PSA Cryptography API specification,
* it must use standard types for things like the argument of psa_open_key().
* If it wasn't for that constraint, psa_open_key() would take a
* `psa_key_file_id_t` argument. As a workaround, make `psa_key_id_t` an
* alias for `psa_key_file_id_t` when building for a multi-client service. */
typedef psa_key_file_id_t psa_key_id_t;
#else /* !MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER */
/* By default, a key file identifier is just the application key identifier. */
typedef psa_app_key_id_t psa_key_file_id_t;
#define PSA_KEY_FILE_GET_KEY_ID( id ) ( id )
#endif /* !MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER */
#endif /* PSA_CRYPTO_PLATFORM_H */

7
include/psa/crypto_types.h
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@ -90,7 +90,14 @@ typedef uint32_t psa_key_lifetime_t;
/** Encoding of identifiers of persistent keys.
*/
/* Implementation-specific quirk: The Mbed Crypto library can be built as
* part of a multi-client service that exposes the PSA Crypto API in each
* client and encodes the client identity in the key id argument of functions
* such as psa_open_key(). In this build configuration, we define
* psa_key_id_t in crypto_platform.h instead of here. */
#if !defined(MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER)
typedef uint32_t psa_key_id_t;
#endif
/**@}*/

3
library/version_features.c
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@ -411,6 +411,9 @@ static const char *features[] = {
#if defined(MBEDTLS_PSA_HAS_ITS_IO)
"MBEDTLS_PSA_HAS_ITS_IO",
#endif /* MBEDTLS_PSA_HAS_ITS_IO */
#if defined(MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER)
"MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER",
#endif /* MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER */
#if defined(MBEDTLS_MEMORY_DEBUG)
"MBEDTLS_MEMORY_DEBUG",
#endif /* MBEDTLS_MEMORY_DEBUG */

1
scripts/config.pl
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@ -100,6 +100,7 @@ MBEDTLS_NO_UDBL_DIVISION
MBEDTLS_NO_64BIT_MULTIPLICATION
MBEDTLS_PSA_CRYPTO_SPM
MBEDTLS_PSA_HAS_ITS_IO
MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER
MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C
MBEDTLS_USE_PSA_CRYPTO
_ALT\s*$