CertificateParser.c

00001 // ----------------------------------------------------------------------------
00002 // Copyright 2016-2017 ARM Ltd.
00003 //
00004 // SPDX-License-Identifier: Apache-2.0
00005 //
00006 // Licensed under the Apache License, Version 2.0 (the "License");
00007 // you may not use this file except in compliance with the License.
00008 // You may obtain a copy of the License at
00009 //
00010 //     http://www.apache.org/licenses/LICENSE-2.0
00011 //
00012 // Unless required by applicable law or agreed to in writing, software
00013 // distributed under the License is distributed on an "AS IS" BASIS,
00014 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00015 // See the License for the specific language governing permissions and
00016 // limitations under the License.
00017 // ----------------------------------------------------------------------------
00018 
00019 #include <stdint.h>
00020 #include "pal.h"
00021 #include "mbed-trace/mbed_trace.h"
00022 
00023 #define TRACE_GROUP "mClt"
00024 
00025 bool extract_field_from_certificate(const uint8_t* cer, size_t cer_len, const char *field, char* value)
00026 {
00027 #if 1 // TODO : Uncomment once PAL has feature to extract "L" from certificate
00028     tr_debug("extract_field_from_certificate");
00029 
00030     palX509Attr_t attr = PAL_X509_L_ATTR;
00031     if (strcmp(field,"CN") == 0) {
00032         attr = PAL_X509_CN_ATTR;
00033     } else if (strcmp(field,"L") == 0) {
00034         attr = PAL_X509_L_ATTR;
00035     } else {
00036         return false;
00037     }
00038 
00039     palX509Handle_t cert = NULL;
00040     size_t len = 0;
00041     palStatus_t ret = pal_x509Initiate(&cert);
00042     if (ret != PAL_SUCCESS) {
00043         tr_error("extract_field_from_certificate - cert init failed: %d", (int)ret);
00044         pal_x509Free(&cert);
00045         return false;
00046     }
00047     ret = pal_x509CertParse(cert, cer, cer_len);
00048     if (ret != PAL_SUCCESS) {
00049         tr_error("extract_field_from_certificate - cert parse failed: %d", (int)ret);
00050         pal_x509Free(&cert);
00051         return false;
00052     }    
00053     ret = pal_x509CertGetAttribute(cert, attr, value, 64, &len);
00054     if (ret != PAL_SUCCESS) {
00055         tr_error("extract_field_from_certificate - cert attr get failed: %d", (int)ret);
00056         pal_x509Free(&cert);
00057         return false;
00058     }
00059     pal_x509Free(&cert);
00060     return true;
00061 #else
00062     return false;
00063 #endif
00064 }
00065 
00066