psa: cipher: Move to driver operation context application allocation

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/include/psa/crypto_builtin_cipher.h b/include/psa/crypto_builtin_cipher.h
new file mode 100644
index 0000000..1c6e4c5
--- /dev/null
+++ b/include/psa/crypto_builtin_cipher.h
@@ -0,0 +1,59 @@
+/*
+ *  Context structure declaration of the software-based driver which performs
+ *  cipher operations through the PSA Crypto driver dispatch layer.
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  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.
+ */
+
+#ifndef PSA_CRYPTO_BUILTIN_CIPHER_H
+#define PSA_CRYPTO_BUILTIN_CIPHER_H
+
+#include <psa/crypto_driver_common.h>
+#include "mbedtls/cipher.h"
+
+typedef struct {
+    /** Context structure for the Mbed TLS cipher implementation. */
+    psa_algorithm_t alg;
+    uint8_t iv_size;
+    uint8_t block_size;
+    mbedtls_cipher_context_t cipher;
+} mbedtls_psa_cipher_operation_t;
+
+#define MBEDTLS_PSA_CIPHER_OPERATION_INIT {0, 0, 0, {0}}
+
+/*
+ * BEYOND THIS POINT, TEST DRIVER DECLARATIONS ONLY.
+ */
+#if defined(PSA_CRYPTO_DRIVER_TEST)
+
+typedef mbedtls_psa_cipher_operation_t
+        mbedtls_transparent_test_driver_cipher_operation_t;
+
+typedef struct {
+    unsigned int initialised : 1;
+    mbedtls_transparent_test_driver_cipher_operation_t ctx;
+} mbedtls_opaque_test_driver_cipher_operation_t;
+
+#define MBEDTLS_TRANSPARENT_TEST_DRIVER_CIPHER_OPERATION_INIT \
+     MBEDTLS_PSA_CIPHER_OPERATION_INIT
+
+#define MBEDTLS_OPAQUE_TEST_DRIVER_CIPHER_OPERATION_INIT \
+     { 0, MBEDTLS_TRANSPARENT_TEST_DRIVER_CIPHER_OPERATION_INIT }
+
+#endif /* PSA_CRYPTO_DRIVER_TEST */
+
+#endif /* PSA_CRYPTO_BUILTIN_CIPHER_H */