Crypto: Add psa_can_do_cipher()

Similarly to what has been done for psa_can_do_hash() and for
the same root cause, exposing the same behaviour.

Signed-off-by: Antonio de Angelis <[email protected]>
Change-Id: I09e6adfb718951b17c6d3bf77e6b7f5cd1135e0d

Author: adeaarm

interface/src/tfm_crypto_api.c

@@ -74,6 +74,17 @@ TFM_CRYPTO_API(int, psa_can_do_hash)(psa_algorithm_t hash_alg)
     return (int)true;
 }
 
+TFM_CRYPTO_API(int, psa_can_do_cipher)(psa_key_type_t key_type, psa_algorithm_t cipher_alg)
+{
+    (void)cipher_alg;
+    (void)key_type;
+    /* There isn't any cipher algorithm that would not be ready
+     * to be used after TF-M has booted up, hence this function
+     * just returns success all the time
+     */
+    return (int)true;
+}
+
 TFM_CRYPTO_API(psa_status_t, psa_open_key)(psa_key_id_t id,
                                            psa_key_id_t *key)
 {

secure_fw/partitions/crypto/crypto_spe.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019-2021, Arm Limited. All rights reserved.
+ * SPDX-FileCopyrightText: Copyright The TrustedFirmware-M Contributors
  *
  * SPDX-License-Identifier: BSD-3-Clause
  *
@@ -26,6 +26,8 @@
         PSA_FUNCTION_NAME(psa_crypto_init)
 #define psa_can_do_hash \
         PSA_FUNCTION_NAME(psa_can_do_hash)
+#define psa_can_do_cipher \
+        PSA_FUNCTION_NAME(psa_can_do_cipher)
 #define psa_key_derivation_get_capacity \
         PSA_FUNCTION_NAME(psa_key_derivation_get_capacity)
 #define psa_key_derivation_set_capacity \