diff --git a/include/psa/crypto_values.h b/include/psa/crypto_values.h
index 02e9c00..199bcac 100644
--- a/include/psa/crypto_values.h
+++ b/include/psa/crypto_values.h
@@ -1647,6 +1647,73 @@
  */
 #define PSA_KEY_ID_VENDOR_MAX                   ((psa_key_id_t)0x7fffffff)
 
+
+#if !defined(MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER)
+
+#define MBEDTLS_SVC_KEY_ID_INIT ( (psa_key_id_t)0 )
+#define MBEDTLS_SVC_KEY_ID_GET_KEY_ID( id ) ( id )
+#define MBEDTLS_SVC_KEY_ID_GET_OWNER_ID( id ) ( 0 )
+
+/** Utility to initialize a key identifier at runtime.
+ *
+ * \param unused  Unused parameter.
+ * \param key_id  Identifier of the key.
+ */
+static inline mbedtls_svc_key_id_t mbedtls_svc_key_id_make(
+    unsigned int unused, psa_key_id_t key_id )
+{
+    (void)unused;
+
+    return( key_id );
+}
+
+/** Compare two key identifiers.
+ *
+ * \param id1 First key identifier.
+ * \param id2 Second key identifier.
+ *
+ * \return Non-zero if the two key identifier are equal, zero otherwise.
+ */
+static inline int mbedtls_svc_key_id_equal( mbedtls_svc_key_id_t id1,
+                                            mbedtls_svc_key_id_t id2 )
+{
+    return( id1 == id2 );
+}
+
+#else /* MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER */
+
+#define MBEDTLS_SVC_KEY_ID_INIT ( (mbedtls_svc_key_id_t){ 0, 0 } )
+#define MBEDTLS_SVC_KEY_ID_GET_KEY_ID( id ) ( ( id ).key_id )
+#define MBEDTLS_SVC_KEY_ID_GET_OWNER_ID( id ) ( ( id ).owner )
+
+/** Utility to initialize a key identifier at runtime.
+ *
+ * \param owner_id Identifier of the key owner.
+ * \param key_id   Identifier of the key.
+ */
+static inline mbedtls_svc_key_id_t mbedtls_svc_key_id_make(
+    mbedtls_key_owner_id_t owner_id, psa_key_id_t key_id )
+{
+    return( (mbedtls_svc_key_id_t){ .key_id = key_id,
+                                    .owner = owner_id } );
+}
+
+/** Compare two key identifiers.
+ *
+ * \param id1 First key identifier.
+ * \param id2 Second key identifier.
+ *
+ * \return Non-zero if the two key identifier are equal, zero otherwise.
+ */
+static inline int mbedtls_svc_key_id_equal( mbedtls_svc_key_id_t id1,
+                                            mbedtls_svc_key_id_t id2 )
+{
+    return( ( id1.key_id == id2.key_id ) &&
+            mbedtls_key_owner_id_equal( id1.owner, id2.owner ) );
+}
+
+#endif /* !MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER */
+
 /**@}*/
 
 /** \defgroup policy Key policies