Maxim Integrated / Mbed OS MAXREFDES155#

DeepCover Embedded Security in IoT: Public-key Secured Data Paths

Dependencies:   MaximInterface

The MAXREFDES155# is an internet-of-things (IoT) embedded-security reference design, built to authenticate and control a sensing node using elliptic-curve-based public-key cryptography with control and notification from a web server.

The hardware includes an ARM® mbed™ shield and attached sensor endpoint. The shield contains a DS2476 DeepCover® ECDSA/SHA-2 coprocessor, Wifi communication, LCD push-button controls, and status LEDs. The sensor endpoint is attached to the shield using a 300mm cable and contains a DS28C36 DeepCover ECDSA/SHA-2 authenticator, IR-thermal sensor, and aiming laser for the IR sensor. The MAXREFDES155# is equipped with a standard Arduino® form-factor shield connector for immediate testing using an mbed board such as the MAX32600MBED#. The combination of these two devices represent an IoT device. Communication to the web server is accomplished with the shield Wifi circuitry. Communication from the shield to the attached sensor module is accomplished over I2C . The sensor module represents an IoT endpoint that generates small data with a requirement for message authenticity/integrity and secure on/off operational control.

The design is hierarchical with each mbed platform and shield communicating data from the sensor node to a web server that maintains a centralized log and dispatches notifications as necessary. The simplicity of this design enables rapid integration into any star-topology IoT network to provide security with the low overhead and cost provided by the ECDSA-P256 asymmetric-key and SHA-256 symmetric-key algorithms.

More information about the MAXREFDES155# is available on the Maxim Integrated website.

xternal/rapidjson/internal/strfunc.h@18:c2631e985780, 2019-12-03 (annotated)

Committer:
IanBenzMaxim
Date:
Tue Dec 03 12:56:25 2019 -0600
Revision:
18:c2631e985780
Parent:
16:a004191a79ab 
Updated MaximInterface to version 2.1.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
IanBenzMaxim 0:33d4e66780c0 1 // Tencent is pleased to support the open source community by making RapidJSON available.
IanBenzMaxim 0:33d4e66780c0 2 //
IanBenzMaxim 0:33d4e66780c0 3 // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
IanBenzMaxim 0:33d4e66780c0 4 //
IanBenzMaxim 0:33d4e66780c0 5 // Licensed under the MIT License (the "License"); you may not use this file except
IanBenzMaxim 0:33d4e66780c0 6 // in compliance with the License. You may obtain a copy of the License at
IanBenzMaxim 0:33d4e66780c0 7 //
IanBenzMaxim 0:33d4e66780c0 8 // http://opensource.org/licenses/MIT
IanBenzMaxim 0:33d4e66780c0 9 //
IanBenzMaxim 0:33d4e66780c0 10 // Unless required by applicable law or agreed to in writing, software distributed
IanBenzMaxim 0:33d4e66780c0 11 // under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
IanBenzMaxim 0:33d4e66780c0 12 // CONDITIONS OF ANY KIND, either express or implied. See the License for the
IanBenzMaxim 0:33d4e66780c0 13 // specific language governing permissions and limitations under the License.
IanBenzMaxim 0:33d4e66780c0 14
IanBenzMaxim 0:33d4e66780c0 15 #ifndef RAPIDJSON_INTERNAL_STRFUNC_H_
IanBenzMaxim 0:33d4e66780c0 16 #define RAPIDJSON_INTERNAL_STRFUNC_H_
IanBenzMaxim 0:33d4e66780c0 17
IanBenzMaxim 0:33d4e66780c0 18 #include "../stream.h"
IanBenzMaxim 0:33d4e66780c0 19
IanBenzMaxim 0:33d4e66780c0 20 RAPIDJSON_NAMESPACE_BEGIN
IanBenzMaxim 0:33d4e66780c0 21 namespace internal {
IanBenzMaxim 0:33d4e66780c0 22
IanBenzMaxim 0:33d4e66780c0 23 //! Custom strlen() which works on different character types.
IanBenzMaxim 0:33d4e66780c0 24 /*! \tparam Ch Character type (e.g. char, wchar_t, short)
IanBenzMaxim 0:33d4e66780c0 25 \param s Null-terminated input string.
IanBenzMaxim 0:33d4e66780c0 26 \return Number of characters in the string.
IanBenzMaxim 0:33d4e66780c0 27 \note This has the same semantics as strlen(), the return value is not number of Unicode codepoints.
IanBenzMaxim 0:33d4e66780c0 28 */
IanBenzMaxim 0:33d4e66780c0 29 template <typename Ch>
IanBenzMaxim 0:33d4e66780c0 30 inline SizeType StrLen(const Ch* s) {
IanBenzMaxim 0:33d4e66780c0 31 RAPIDJSON_ASSERT(s != 0);
IanBenzMaxim 0:33d4e66780c0 32 const Ch* p = s;
IanBenzMaxim 0:33d4e66780c0 33 while (*p) ++p;
IanBenzMaxim 0:33d4e66780c0 34 return SizeType(p - s);
IanBenzMaxim 0:33d4e66780c0 35 }
IanBenzMaxim 0:33d4e66780c0 36
IanBenzMaxim 0:33d4e66780c0 37 //! Returns number of code points in a encoded string.
IanBenzMaxim 0:33d4e66780c0 38 template<typename Encoding>
IanBenzMaxim 0:33d4e66780c0 39 bool CountStringCodePoint(const typename Encoding::Ch* s, SizeType length, SizeType* outCount) {
IanBenzMaxim 0:33d4e66780c0 40 RAPIDJSON_ASSERT(s != 0);
IanBenzMaxim 0:33d4e66780c0 41 RAPIDJSON_ASSERT(outCount != 0);
IanBenzMaxim 0:33d4e66780c0 42 GenericStringStream<Encoding> is(s);
IanBenzMaxim 0:33d4e66780c0 43 const typename Encoding::Ch* end = s + length;
IanBenzMaxim 0:33d4e66780c0 44 SizeType count = 0;
IanBenzMaxim 0:33d4e66780c0 45 while (is.src_ < end) {
IanBenzMaxim 0:33d4e66780c0 46 unsigned codepoint;
IanBenzMaxim 0:33d4e66780c0 47 if (!Encoding::Decode(is, &codepoint))
IanBenzMaxim 0:33d4e66780c0 48 return false;
IanBenzMaxim 0:33d4e66780c0 49 count++;
IanBenzMaxim 0:33d4e66780c0 50 }
IanBenzMaxim 0:33d4e66780c0 51 *outCount = count;
IanBenzMaxim 0:33d4e66780c0 52 return true;
IanBenzMaxim 0:33d4e66780c0 53 }
IanBenzMaxim 0:33d4e66780c0 54
IanBenzMaxim 0:33d4e66780c0 55 } // namespace internal
IanBenzMaxim 0:33d4e66780c0 56 RAPIDJSON_NAMESPACE_END
IanBenzMaxim 0:33d4e66780c0 57
IanBenzMaxim 0:33d4e66780c0 58 #endif // RAPIDJSON_INTERNAL_STRFUNC_H_