Add a handcrafted first version of the driver wrapper code

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
diff --git a/library/psa_crypto_driver_wrappers.h b/library/psa_crypto_driver_wrappers.h
new file mode 100644
index 0000000..8fbf034
--- /dev/null
+++ b/library/psa_crypto_driver_wrappers.h
@@ -0,0 +1,40 @@
+/*
+ *  Function signatures for functionality that can be provided by
+ *  cryptographic accelerators.
+ *  Warning: auto-generated file.
+ */
+/*  Copyright (C) 2020, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+
+#ifndef PSA_CRYPTO_DRIVER_WRAPPERS_H
+#define PSA_CRYPTO_DRIVER_WRAPPERS_H
+
+#include "psa/crypto.h"
+#include "psa/crypto_driver_common.h"
+
+psa_status_t psa_driver_wrapper_sign_hash( psa_key_slot_t *slot,
+                                           psa_algorithm_t alg,
+                                           const uint8_t *hash,
+                                           size_t hash_length,
+                                           uint8_t *signature,
+                                           size_t signature_size,
+                                           size_t *signature_length );
+
+#endif /* PSA_CRYPTO_DRIVER_WRAPPERS_H */
+
+/* End of automatically generated file. */