diff --git a/tests/include/test/psa_crypto_helpers.h b/tests/include/test/psa_crypto_helpers.h
index 30bb20f..571055c 100644
--- a/tests/include/test/psa_crypto_helpers.h
+++ b/tests/include/test/psa_crypto_helpers.h
@@ -34,6 +34,19 @@
 #include "mbedtls/psa_util.h"
 #endif
 
+#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
+/* All test functions that create persistent keys must call
+ * `TEST_USES_KEY_ID( key_id )` before creating a persistent key with this
+ * identifier, and must call psa_purge_key_storage() in their cleanup
+ * code. */
+int mbedtls_test_uses_key_id( mbedtls_svc_key_id_t key_id );
+void mbedtls_test_psa_purge_key_storage( void );
+#define TEST_USES_KEY_ID( key_id )                       \
+    TEST_ASSERT( mbedtls_test_uses_key_id( key_id ) )
+#else /* MBEDTLS_PSA_CRYPTO_STORAGE_C */
+#define TEST_USES_KEY_ID( key_id ) ( (void) ( key_id ) )
+#endif /* MBEDTLS_PSA_CRYPTO_STORAGE_C */
+
 #define PSA_INIT( ) PSA_ASSERT( psa_crypto_init( ) )
 
 /** Check for things that have not been cleaned up properly in the
diff --git a/tests/src/psa_crypto_helpers.c b/tests/src/psa_crypto_helpers.c
index cb79a22..69bb8a1 100644
--- a/tests/src/psa_crypto_helpers.c
+++ b/tests/src/psa_crypto_helpers.c
@@ -28,6 +28,45 @@
 
 #include <psa/crypto.h>
 
+#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
+
+#include <psa_crypto_storage.h>
+
+static mbedtls_svc_key_id_t key_ids_used_in_test[9];
+static size_t num_key_ids_used;
+
+/* Record a key id as potentially used in a test case. */
+int mbedtls_test_uses_key_id( mbedtls_svc_key_id_t key_id )
+{
+    size_t i;
+    if( MBEDTLS_SVC_KEY_ID_GET_KEY_ID( key_id ) >
+        PSA_MAX_PERSISTENT_KEY_IDENTIFIER )
+    {
+        /* Don't touch key id values that designate non-key files. */
+        return( 1 );
+    }
+    for( i = 0; i < num_key_ids_used ; i++ )
+    {
+        if( mbedtls_svc_key_id_equal( key_id, key_ids_used_in_test[i] ) )
+            return( 1 );
+    }
+    if( num_key_ids_used == ARRAY_LENGTH( key_ids_used_in_test ) )
+        return( 0 );
+    key_ids_used_in_test[num_key_ids_used] = key_id;
+    ++num_key_ids_used;
+    return( 1 );
+}
+
+/* Destroy all key ids that may have been created by the current test case. */
+void mbedtls_test_psa_purge_key_storage( void )
+{
+    size_t i;
+    for( i = 0; i < num_key_ids_used; i++ )
+        psa_destroy_persistent_key( key_ids_used_in_test[i] );
+    num_key_ids_used = 0;
+}
+#endif /* MBEDTLS_PSA_CRYPTO_STORAGE_C */
+
 const char *mbedtls_test_helper_is_psa_leaking( void )
 {
     mbedtls_psa_stats_t stats;
diff --git a/tests/suites/test_suite_psa_crypto_se_driver_hal.function b/tests/suites/test_suite_psa_crypto_se_driver_hal.function
index 929ca96..be7c246 100644
--- a/tests/suites/test_suite_psa_crypto_se_driver_hal.function
+++ b/tests/suites/test_suite_psa_crypto_se_driver_hal.function
@@ -767,42 +767,6 @@
     return( ok );
 }
 
-static mbedtls_svc_key_id_t key_ids_used_in_test[9];
-static size_t num_key_ids_used;
-
-/* Record a key id as potentially used in a test case. */
-int mbedtls_test_uses_key_id( mbedtls_svc_key_id_t key_id )
-{
-    size_t i;
-    if( MBEDTLS_SVC_KEY_ID_GET_KEY_ID( key_id ) >
-        PSA_MAX_PERSISTENT_KEY_IDENTIFIER )
-    {
-        /* Don't touch key id values that designate non-key files. */
-        return( 1 );
-    }
-    for( i = 0; i < num_key_ids_used ; i++ )
-    {
-        if( mbedtls_svc_key_id_equal( key_id, key_ids_used_in_test[i] ) )
-            return( 1 );
-    }
-    if( num_key_ids_used == ARRAY_LENGTH( key_ids_used_in_test ) )
-        return( 0 );
-    key_ids_used_in_test[num_key_ids_used] = key_id;
-    ++num_key_ids_used;
-    return( 1 );
-}
-#define TEST_USES_KEY_ID( key_id )                       \
-    TEST_ASSERT( mbedtls_test_uses_key_id( key_id ) )
-
-/* Destroy all key ids that may have been created by the current test case. */
-void mbedtls_test_psa_purge_key_storage( void )
-{
-    size_t i;
-    for( i = 0; i < num_key_ids_used; i++ )
-        psa_destroy_persistent_key( key_ids_used_in_test[i] );
-    num_key_ids_used = 0;
-}
-
 static void psa_purge_storage( void )
 {
     psa_key_location_t location;
diff --git a/tests/suites/test_suite_psa_crypto_slot_management.function b/tests/suites/test_suite_psa_crypto_slot_management.function
index 5a5f933..2be1a73 100644
--- a/tests/suites/test_suite_psa_crypto_slot_management.function
+++ b/tests/suites/test_suite_psa_crypto_slot_management.function
@@ -43,51 +43,6 @@
     INVALID_HANDLE_HUGE,
 } invalid_handle_construction_t;
 
-/* All test functions that create persistent keys must call
- * `TEST_USES_KEY_ID( key_id )` before creating a persistent key with this
- * identifier, and must call psa_purge_key_storage() in their cleanup
- * code. */
-
-#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
-static mbedtls_svc_key_id_t key_ids_used_in_test[9];
-static size_t num_key_ids_used;
-
-/* Record a key id as potentially used in a test case. */
-int mbedtls_test_uses_key_id( mbedtls_svc_key_id_t key_id )
-{
-    size_t i;
-    if( MBEDTLS_SVC_KEY_ID_GET_KEY_ID( key_id ) >
-        PSA_MAX_PERSISTENT_KEY_IDENTIFIER )
-    {
-        /* Don't touch key id values that designate non-key files. */
-        return( 1 );
-    }
-    for( i = 0; i < num_key_ids_used ; i++ )
-    {
-        if( mbedtls_svc_key_id_equal( key_id, key_ids_used_in_test[i] ) )
-            return( 1 );
-    }
-    if( num_key_ids_used == ARRAY_LENGTH( key_ids_used_in_test ) )
-        return( 0 );
-    key_ids_used_in_test[num_key_ids_used] = key_id;
-    ++num_key_ids_used;
-    return( 1 );
-}
-#define TEST_USES_KEY_ID( key_id )                       \
-    TEST_ASSERT( mbedtls_test_uses_key_id( key_id ) )
-
-/* Destroy all key ids that may have been created by the current test case. */
-void mbedtls_test_psa_purge_key_storage( void )
-{
-    size_t i;
-    for( i = 0; i < num_key_ids_used; i++ )
-        psa_destroy_persistent_key( key_ids_used_in_test[i] );
-    num_key_ids_used = 0;
-}
-#else
-#define TEST_USES_KEY_ID( key_id ) ( (void) ( key_id ) )
-#endif /* MBEDTLS_PSA_CRYPTO_STORAGE_C */
-
 /** Apply \p invalidate_method to invalidate the specified key:
  * close it, destroy it, or do nothing;
  */