/*
 * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#ifndef PACKEDC_CRYPTO_CALLER_GENERATE_RANDOM_H
#define PACKEDC_CRYPTO_CALLER_GENERATE_RANDOM_H

#include <string.h>
#include <stdlib.h>
#include <service/common/client/service_client.h>
#include <protocols/rpc/common/packed-c/status.h>
#include <protocols/service/crypto/packed-c/opcodes.h>
#include <protocols/service/crypto/packed-c/generate_random.h>
#include <common/tlv/tlv.h>

#ifdef __cplusplus
extern "C" {
#endif

static inline psa_status_t crypto_caller_generate_random(struct service_client *context,
	uint8_t *output, size_t output_size)
{
	psa_status_t psa_status = PSA_ERROR_GENERIC_ERROR;
	struct ts_crypto_generate_random_in req_msg;
	size_t req_len = sizeof(struct ts_crypto_generate_random_in);

	 req_msg.size = output_size;

	rpc_call_handle call_handle;
	uint8_t *req_buf;

	call_handle = rpc_caller_session_begin(context->session, &req_buf, req_len,
					       tlv_required_space(output_size));

	if (call_handle) {

		uint8_t *resp_buf;
		size_t resp_len;
		service_status_t service_status;

		memcpy(req_buf, &req_msg, req_len);

		context->rpc_status =
			rpc_caller_session_invoke(call_handle, TS_CRYPTO_OPCODE_GENERATE_RANDOM,
						  &resp_buf, &resp_len, &service_status);

		if (context->rpc_status == RPC_SUCCESS) {

			psa_status = service_status;

			if (psa_status == PSA_SUCCESS) {

				struct tlv_const_iterator resp_iter;
				struct tlv_record decoded_record;
				tlv_const_iterator_begin(&resp_iter, resp_buf, resp_len);

				if (tlv_find_decode(&resp_iter,
							TS_CRYPTO_GENERATE_RANDOM_OUT_TAG_RANDOM_BYTES, &decoded_record)) {

					if (decoded_record.length <= output_size) {

						memcpy(output, decoded_record.value, decoded_record.length);
					}
					else {
						/* Provided buffer is too small */
						psa_status = PSA_ERROR_BUFFER_TOO_SMALL;
					}
				}
				else {
					/* Mandatory response parameter missing */
					psa_status = PSA_ERROR_GENERIC_ERROR;
				}
			}
		}

		rpc_caller_session_end(call_handle);
	}

	return psa_status;
}

#ifdef __cplusplus
}
#endif

#endif /* PACKEDC_CRYPTO_CALLER_GENERATE_RANDOM_H */