Diff: simple-mbed-cloud-client/mbed-cloud-client/source/CertificateParser.c

Revision:

0:8f0bb79ddd48

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/simple-mbed-cloud-client/mbed-cloud-client/source/CertificateParser.c	Tue May 04 08:55:12 2021 +0000
@@ -0,0 +1,66 @@
+// ----------------------------------------------------------------------------
+// Copyright 2016-2017 ARM Ltd.
+//
+// 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.
+// ----------------------------------------------------------------------------
+
+#include <stdint.h>
+#include "pal.h"
+#include "mbed-trace/mbed_trace.h"
+
+#define TRACE_GROUP "mClt"
+
+bool extract_field_from_certificate(const uint8_t* cer, size_t cer_len, const char *field, char* value)
+{
+#if 1 // TODO : Uncomment once PAL has feature to extract "L" from certificate
+    tr_debug("extract_field_from_certificate");
+
+    palX509Attr_t attr = PAL_X509_L_ATTR;
+    if (strcmp(field,"CN") == 0) {
+        attr = PAL_X509_CN_ATTR;
+    } else if (strcmp(field,"L") == 0) {
+        attr = PAL_X509_L_ATTR;
+    } else {
+        return false;
+    }
+
+    palX509Handle_t cert = 0;
+    size_t len = 0;
+    palStatus_t ret = pal_x509Initiate(&cert);
+    if (ret != PAL_SUCCESS) {
+        tr_error("extract_field_from_certificate - cert init failed: %d", (int)ret);
+        pal_x509Free(&cert);
+        return false;
+    }
+    ret = pal_x509CertParse(cert, cer, cer_len);
+    if (ret != PAL_SUCCESS) {
+        tr_error("extract_field_from_certificate - cert parse failed: %d", (int)ret);
+        pal_x509Free(&cert);
+        return false;
+    }    
+    ret = pal_x509CertGetAttribute(cert, attr, value, 64, &len);
+    if (ret != PAL_SUCCESS) {
+        tr_error("extract_field_from_certificate - cert attr get failed: %d", (int)ret);
+        pal_x509Free(&cert);
+        return false;
+    }
+    pal_x509Free(&cert);
+    return true;
+#else
+    return false;
+#endif
+}
+
+