1 /*
2  * Copyright (c) 2024, Arm Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <string.h>
8 #include "mbedtls_utils.h"
9 
10 /*
11  * Official value: http://www.oid-info.com/get/2.5.4.3
12  * Hex converter: https://misc.daniel-marschall.de/asn.1/oid-converter/online.php
13  */
14 #define CN_OID_TAG (0x06)
15 #define CN_OID_LEN (0x03)
16 #define CN_OID_VAL {0x55, 0x04, 0x03}
17 
18 /* Searches for the common name field in an mbedtls_asn1_named_data object */
findCommonName(const mbedtls_asn1_named_data * name)19 const mbedtls_asn1_buf* findCommonName(const mbedtls_asn1_named_data *name)
20 {
21 	static const uint8_t cn_oid_values[CN_OID_LEN] = CN_OID_VAL;
22 
23 	while (name)
24 	{
25 		if (name->oid.tag == CN_OID_TAG && name->oid.len == CN_OID_LEN) {
26 			if (name->oid.p != NULL) {
27 				if (!memcmp(name->oid.p, cn_oid_values, (size_t) CN_OID_LEN))
28 					return &name->val;
29 			}
30 		}
31 
32 		name = name->next;
33 	}
34 
35 	return NULL;
36 }
37