316 lines
13 KiB
C
316 lines
13 KiB
C
/*
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* Helper functions for tests that use the PSA Crypto API.
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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_HELPERS_H
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#define PSA_CRYPTO_HELPERS_H
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#include "test/helpers.h"
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#if defined(MBEDTLS_PSA_CRYPTO_C)
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#include "test/psa_helpers.h"
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#include <psa/crypto.h>
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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#include "mbedtls/psa_util.h"
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#endif
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#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
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/* Internal function for #TEST_USES_KEY_ID. Return 1 on success, 0 on failure. */
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int mbedtls_test_uses_key_id( mbedtls_svc_key_id_t key_id );
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/** Destroy persistent keys recorded with #TEST_USES_KEY_ID.
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*/
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void mbedtls_test_psa_purge_key_storage( void );
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/** Purge the in-memory cache of persistent keys recorded with
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* #TEST_USES_KEY_ID.
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*
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* Call this function before calling PSA_DONE() if it's ok for
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* persistent keys to still exist at this point.
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*/
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void mbedtls_test_psa_purge_key_cache( void );
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/** \def TEST_USES_KEY_ID
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*
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* Call this macro in a test function before potentially creating a
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* persistent key. Test functions that use this mechanism must call
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* mbedtls_test_psa_purge_key_storage() in their cleanup code.
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*
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* This macro records a persistent key identifier as potentially used in the
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* current test case. Recorded key identifiers will be cleaned up at the end
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* of the test case, even on failure.
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*
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* This macro has no effect on volatile keys. Therefore, it is safe to call
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* this macro in a test function that creates either volatile or persistent
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* keys depending on the test data.
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*
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* This macro currently has no effect on special identifiers
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* used to store implementation-specific files.
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*
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* Calling this macro multiple times on the same key identifier in the same
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* test case has no effect.
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*
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* This macro can fail the test case if there isn't enough memory to
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* record the key id.
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*
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* \param key_id The PSA key identifier to record.
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*/
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#define TEST_USES_KEY_ID( key_id ) \
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TEST_ASSERT( mbedtls_test_uses_key_id( key_id ) )
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#else /* MBEDTLS_PSA_CRYPTO_STORAGE_C */
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#define TEST_USES_KEY_ID( key_id ) ( (void) ( key_id ) )
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#define mbedtls_test_psa_purge_key_storage( ) ( (void) 0 )
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#define mbedtls_test_psa_purge_key_cache( ) ( (void) 0 )
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#endif /* MBEDTLS_PSA_CRYPTO_STORAGE_C */
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#define PSA_INIT( ) PSA_ASSERT( psa_crypto_init( ) )
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/** Check for things that have not been cleaned up properly in the
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* PSA subsystem.
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*
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* \return NULL if nothing has leaked.
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* \return A string literal explaining what has not been cleaned up
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* if applicable.
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*/
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const char *mbedtls_test_helper_is_psa_leaking( void );
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/** Check that no PSA Crypto key slots are in use.
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*
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* If any slots are in use, mark the current test as failed and jump to
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* the exit label. This is equivalent to
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* `TEST_ASSERT( ! mbedtls_test_helper_is_psa_leaking( ) )`
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* but with a more informative message.
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*/
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#define ASSERT_PSA_PRISTINE( ) \
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do \
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{ \
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if( test_fail_if_psa_leaking( __LINE__, __FILE__ ) ) \
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goto exit; \
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} \
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while( 0 )
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/** Shut down the PSA Crypto subsystem and destroy persistent keys.
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* Expect a clean shutdown, with no slots in use.
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*
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* If some key slots are still in use, record the test case as failed,
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* but continue executing. This macro is suitable (and primarily intended)
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* for use in the cleanup section of test functions.
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*
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* \note Persistent keys must be recorded with #TEST_USES_KEY_ID before
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* creating them.
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*/
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#define PSA_DONE( ) \
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do \
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{ \
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test_fail_if_psa_leaking( __LINE__, __FILE__ ); \
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mbedtls_test_psa_purge_key_storage( ); \
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mbedtls_psa_crypto_free( ); \
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} \
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while( 0 )
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/** Shut down the PSA Crypto subsystem, allowing persistent keys to survive.
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* Expect a clean shutdown, with no slots in use.
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*
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* If some key slots are still in use, record the test case as failed and
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* jump to the `exit` label.
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*/
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#define PSA_SESSION_DONE( ) \
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do \
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{ \
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mbedtls_test_psa_purge_key_cache( ); \
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ASSERT_PSA_PRISTINE( ); \
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mbedtls_psa_crypto_free( ); \
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} \
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while( 0 )
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#if defined(RECORD_PSA_STATUS_COVERAGE_LOG)
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psa_status_t mbedtls_test_record_status( psa_status_t status,
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const char *func,
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const char *file, int line,
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const char *expr );
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/** Return value logging wrapper macro.
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*
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* Evaluate \p expr. Write a line recording its value to the log file
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* #STATUS_LOG_FILE_NAME and return the value. The line is a colon-separated
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* list of fields:
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* ```
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* value of expr:string:__FILE__:__LINE__:expr
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* ```
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*
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* The test code does not call this macro explicitly because that would
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* be very invasive. Instead, we instrument the source code by defining
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* a bunch of wrapper macros like
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* ```
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* #define psa_crypto_init() RECORD_STATUS("psa_crypto_init", psa_crypto_init())
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* ```
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* These macro definitions must be present in `instrument_record_status.h`
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* when building the test suites.
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*
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* \param string A string, normally a function name.
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* \param expr An expression to evaluate, normally a call of the function
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* whose name is in \p string. This expression must return
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* a value of type #psa_status_t.
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* \return The value of \p expr.
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*/
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#define RECORD_STATUS( string, expr ) \
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mbedtls_test_record_status( ( expr ), string, __FILE__, __LINE__, #expr )
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#include "instrument_record_status.h"
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#endif /* defined(RECORD_PSA_STATUS_COVERAGE_LOG) */
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/** Return extended key usage policies.
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*
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* Do a key policy permission extension on key usage policies always involves
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* permissions of other usage policies
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* (like PSA_KEY_USAGE_SIGN_HASH involves PSA_KEY_USAGE_SIGN_MESSGAE).
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*/
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psa_key_usage_t mbedtls_test_update_key_usage_flags( psa_key_usage_t usage_flags );
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/** Skip a test case if the given key is a 192 bits AES key and the AES
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* implementation is at least partially provided by an accelerator or
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* alternative implementation.
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*
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* Call this macro in a test case when a cryptographic operation that may
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* involve an AES operation returns a #PSA_ERROR_NOT_SUPPORTED error code.
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* The macro call will skip and not fail the test case in case the operation
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* involves a 192 bits AES key and the AES implementation is at least
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* partially provided by an accelerator or alternative implementation.
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*
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* Hardware AES implementations not supporting 192 bits keys commonly exist.
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* Consequently, PSA test cases aim at not failing when an AES operation with
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* a 192 bits key performed by an alternative AES implementation returns
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* with the #PSA_ERROR_NOT_SUPPORTED error code. The purpose of this macro
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* is to facilitate this and make the test case code more readable.
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*
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* \param key_type Key type
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* \param key_bits Key length in number of bits.
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*/
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#if defined(MBEDTLS_AES_ALT) || \
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defined(MBEDTLS_AES_SETKEY_ENC_ALT) || \
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defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_AES)
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#define MBEDTLS_TEST_HAVE_ALT_AES 1
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#else
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#define MBEDTLS_TEST_HAVE_ALT_AES 0
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#endif
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#define MBEDTLS_TEST_PSA_SKIP_IF_ALT_AES_192( key_type, key_bits ) \
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do \
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{ \
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if( ( MBEDTLS_TEST_HAVE_ALT_AES ) && \
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( ( key_type ) == PSA_KEY_TYPE_AES ) && \
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( key_bits == 192 ) ) \
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{ \
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mbedtls_test_skip( "AES-192 not supported", __LINE__, __FILE__ ); \
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goto exit; \
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} \
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} \
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while( 0 )
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/** Skip a test case if a GCM operation with a nonce length different from
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* 12 bytes fails and was performed by an accelerator or alternative
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* implementation.
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*
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* Call this macro in a test case when an AEAD cryptography operation that
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* may involve the GCM mode returns with a #PSA_ERROR_NOT_SUPPORTED error
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* code. The macro call will skip and not fail the test case in case the
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* operation involves the GCM mode, a nonce with a length different from
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* 12 bytes and the GCM mode implementation is an alternative one.
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*
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* Hardware GCM implementations not supporting nonce lengths different from
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* 12 bytes commonly exist, as supporting a non-12-byte nonce requires
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* additional computations involving the GHASH function.
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* Consequently, PSA test cases aim at not failing when an AEAD operation in
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* GCM mode with a nonce length different from 12 bytes is performed by an
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* alternative GCM implementation and returns with a #PSA_ERROR_NOT_SUPPORTED
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* error code. The purpose of this macro is to facilitate this check and make
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* the test case code more readable.
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*
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* \param alg The AEAD algorithm.
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* \param nonce_length The nonce length in number of bytes.
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*/
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#if defined(MBEDTLS_GCM_ALT) || \
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defined(MBEDTLS_PSA_ACCEL_ALG_GCM)
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#define MBEDTLS_TEST_HAVE_ALT_GCM 1
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#else
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#define MBEDTLS_TEST_HAVE_ALT_GCM 0
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#endif
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#define MBEDTLS_TEST_PSA_SKIP_IF_ALT_GCM_NOT_12BYTES_NONCE( alg, \
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nonce_length ) \
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do \
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{ \
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if( ( MBEDTLS_TEST_HAVE_ALT_GCM ) && \
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( PSA_ALG_AEAD_WITH_SHORTENED_TAG( ( alg ) , 0 ) == \
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PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_GCM, 0 ) ) && \
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( ( nonce_length ) != 12 ) ) \
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{ \
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mbedtls_test_skip( "GCM with non-12-byte IV is not supported", __LINE__, __FILE__ ); \
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goto exit; \
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} \
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} \
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while( 0 )
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#if !defined(MBEDTLS_MD_C)
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#define PSA_INIT_IF_NO_MD( ) PSA_INIT( )
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#define PSA_DONE_IF_NO_MD( ) PSA_DONE( )
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#endif
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#endif /* MBEDTLS_PSA_CRYPTO_C */
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#if defined(MBEDTLS_MD_C)
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#define PSA_INIT_IF_NO_MD( ) ( (void) 0 )
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#define PSA_DONE_IF_NO_MD( ) ( (void) 0 )
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#endif
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/** \def USE_PSA_INIT
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*
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* Call this macro to initialize the PSA subsystem if #MBEDTLS_USE_PSA_CRYPTO
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* or #MBEDTLS_SSL_PROTO_TLS1_3 (In contrast to TLS 1.2 implementation, the
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* TLS 1.3 one uses PSA independently of the definition of
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* #MBEDTLS_USE_PSA_CRYPTO) is enabled and do nothing otherwise. If the
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* initialization fails, mark the test case as failed and jump to the \p exit
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* label.
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*/
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/** \def USE_PSA_DONE
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*
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* Call this macro at the end of a test case if you called #USE_PSA_INIT.
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* This is like #PSA_DONE, except that it does nothing if
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* #MBEDTLS_USE_PSA_CRYPTO is disabled.
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*/
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#if defined(MBEDTLS_USE_PSA_CRYPTO) || defined(MBEDTLS_SSL_PROTO_TLS1_3)
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#define USE_PSA_INIT( ) PSA_INIT( )
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#define USE_PSA_DONE( ) PSA_DONE( )
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#else /* MBEDTLS_USE_PSA_CRYPTO || MBEDTLS_SSL_PROTO_TLS1_3 */
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/* Define empty macros so that we can use them in the preamble and teardown
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* of every test function that uses PSA conditionally based on
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* MBEDTLS_USE_PSA_CRYPTO. */
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#define USE_PSA_INIT( ) ( (void) 0 )
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#define USE_PSA_DONE( ) ( (void) 0 )
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#endif /* !MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_SSL_PROTO_TLS1_3 */
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#endif /* PSA_CRYPTO_HELPERS_H */
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