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/istreamwrapper.h@16:a004191a79ab, 2019-10-03 (annotated)

Committer:
IanBenzMaxim
Date:
Thu Oct 03 11:40:13 2019 -0500
Revision:
16:a004191a79ab
Parent:
rapidjson/istreamwrapper.h@0:33d4e66780c0 
Updated MaximInterface to version 2.0. Updated mbed-os to version 5.5.7. Cleaned up code styling.

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_ISTREAMWRAPPER_H_
IanBenzMaxim 0:33d4e66780c0 16 #define RAPIDJSON_ISTREAMWRAPPER_H_
IanBenzMaxim 0:33d4e66780c0 17
IanBenzMaxim 0:33d4e66780c0 18 #include "stream.h"
IanBenzMaxim 0:33d4e66780c0 19 #include <iosfwd>
IanBenzMaxim 0:33d4e66780c0 20
IanBenzMaxim 0:33d4e66780c0 21 #ifdef __clang__
IanBenzMaxim 0:33d4e66780c0 22 RAPIDJSON_DIAG_PUSH
IanBenzMaxim 0:33d4e66780c0 23 RAPIDJSON_DIAG_OFF(padded)
IanBenzMaxim 0:33d4e66780c0 24 #endif
IanBenzMaxim 0:33d4e66780c0 25
IanBenzMaxim 0:33d4e66780c0 26 #ifdef _MSC_VER
IanBenzMaxim 0:33d4e66780c0 27 RAPIDJSON_DIAG_PUSH
IanBenzMaxim 0:33d4e66780c0 28 RAPIDJSON_DIAG_OFF(4351) // new behavior: elements of array 'array' will be default initialized
IanBenzMaxim 0:33d4e66780c0 29 #endif
IanBenzMaxim 0:33d4e66780c0 30
IanBenzMaxim 0:33d4e66780c0 31 RAPIDJSON_NAMESPACE_BEGIN
IanBenzMaxim 0:33d4e66780c0 32
IanBenzMaxim 0:33d4e66780c0 33 //! Wrapper of \c std::basic_istream into RapidJSON's Stream concept.
IanBenzMaxim 0:33d4e66780c0 34 /*!
IanBenzMaxim 0:33d4e66780c0 35 The classes can be wrapped including but not limited to:
IanBenzMaxim 0:33d4e66780c0 36
IanBenzMaxim 0:33d4e66780c0 37 - \c std::istringstream
IanBenzMaxim 0:33d4e66780c0 38 - \c std::stringstream
IanBenzMaxim 0:33d4e66780c0 39 - \c std::wistringstream
IanBenzMaxim 0:33d4e66780c0 40 - \c std::wstringstream
IanBenzMaxim 0:33d4e66780c0 41 - \c std::ifstream
IanBenzMaxim 0:33d4e66780c0 42 - \c std::fstream
IanBenzMaxim 0:33d4e66780c0 43 - \c std::wifstream
IanBenzMaxim 0:33d4e66780c0 44 - \c std::wfstream
IanBenzMaxim 0:33d4e66780c0 45
IanBenzMaxim 0:33d4e66780c0 46 \tparam StreamType Class derived from \c std::basic_istream.
IanBenzMaxim 0:33d4e66780c0 47 */
IanBenzMaxim 0:33d4e66780c0 48
IanBenzMaxim 0:33d4e66780c0 49 template <typename StreamType>
IanBenzMaxim 0:33d4e66780c0 50 class BasicIStreamWrapper {
IanBenzMaxim 0:33d4e66780c0 51 public:
IanBenzMaxim 0:33d4e66780c0 52 typedef typename StreamType::char_type Ch;
IanBenzMaxim 0:33d4e66780c0 53 BasicIStreamWrapper(StreamType& stream) : stream_(stream), count_(), peekBuffer_() {}
IanBenzMaxim 0:33d4e66780c0 54
IanBenzMaxim 0:33d4e66780c0 55 Ch Peek() const {
IanBenzMaxim 0:33d4e66780c0 56 typename StreamType::int_type c = stream_.peek();
IanBenzMaxim 0:33d4e66780c0 57 return RAPIDJSON_LIKELY(c != StreamType::traits_type::eof()) ? static_cast<Ch>(c) : '\0';
IanBenzMaxim 0:33d4e66780c0 58 }
IanBenzMaxim 0:33d4e66780c0 59
IanBenzMaxim 0:33d4e66780c0 60 Ch Take() {
IanBenzMaxim 0:33d4e66780c0 61 typename StreamType::int_type c = stream_.get();
IanBenzMaxim 0:33d4e66780c0 62 if (RAPIDJSON_LIKELY(c != StreamType::traits_type::eof())) {
IanBenzMaxim 0:33d4e66780c0 63 count_++;
IanBenzMaxim 0:33d4e66780c0 64 return static_cast<Ch>(c);
IanBenzMaxim 0:33d4e66780c0 65 }
IanBenzMaxim 0:33d4e66780c0 66 else
IanBenzMaxim 0:33d4e66780c0 67 return '\0';
IanBenzMaxim 0:33d4e66780c0 68 }
IanBenzMaxim 0:33d4e66780c0 69
IanBenzMaxim 0:33d4e66780c0 70 // tellg() may return -1 when failed. So we count by ourself.
IanBenzMaxim 0:33d4e66780c0 71 size_t Tell() const { return count_; }
IanBenzMaxim 0:33d4e66780c0 72
IanBenzMaxim 0:33d4e66780c0 73 Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
IanBenzMaxim 0:33d4e66780c0 74 void Put(Ch) { RAPIDJSON_ASSERT(false); }
IanBenzMaxim 0:33d4e66780c0 75 void Flush() { RAPIDJSON_ASSERT(false); }
IanBenzMaxim 0:33d4e66780c0 76 size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
IanBenzMaxim 0:33d4e66780c0 77
IanBenzMaxim 0:33d4e66780c0 78 // For encoding detection only.
IanBenzMaxim 0:33d4e66780c0 79 const Ch* Peek4() const {
IanBenzMaxim 0:33d4e66780c0 80 RAPIDJSON_ASSERT(sizeof(Ch) == 1); // Only usable for byte stream.
IanBenzMaxim 0:33d4e66780c0 81 int i;
IanBenzMaxim 0:33d4e66780c0 82 bool hasError = false;
IanBenzMaxim 0:33d4e66780c0 83 for (i = 0; i < 4; ++i) {
IanBenzMaxim 0:33d4e66780c0 84 typename StreamType::int_type c = stream_.get();
IanBenzMaxim 0:33d4e66780c0 85 if (c == StreamType::traits_type::eof()) {
IanBenzMaxim 0:33d4e66780c0 86 hasError = true;
IanBenzMaxim 0:33d4e66780c0 87 stream_.clear();
IanBenzMaxim 0:33d4e66780c0 88 break;
IanBenzMaxim 0:33d4e66780c0 89 }
IanBenzMaxim 0:33d4e66780c0 90 peekBuffer_[i] = static_cast<Ch>(c);
IanBenzMaxim 0:33d4e66780c0 91 }
IanBenzMaxim 0:33d4e66780c0 92 for (--i; i >= 0; --i)
IanBenzMaxim 0:33d4e66780c0 93 stream_.putback(peekBuffer_[i]);
IanBenzMaxim 0:33d4e66780c0 94 return !hasError ? peekBuffer_ : 0;
IanBenzMaxim 0:33d4e66780c0 95 }
IanBenzMaxim 0:33d4e66780c0 96
IanBenzMaxim 0:33d4e66780c0 97 private:
IanBenzMaxim 0:33d4e66780c0 98 BasicIStreamWrapper(const BasicIStreamWrapper&);
IanBenzMaxim 0:33d4e66780c0 99 BasicIStreamWrapper& operator=(const BasicIStreamWrapper&);
IanBenzMaxim 0:33d4e66780c0 100
IanBenzMaxim 0:33d4e66780c0 101 StreamType& stream_;
IanBenzMaxim 0:33d4e66780c0 102 size_t count_; //!< Number of characters read. Note:
IanBenzMaxim 0:33d4e66780c0 103 mutable Ch peekBuffer_[4];
IanBenzMaxim 0:33d4e66780c0 104 };
IanBenzMaxim 0:33d4e66780c0 105
IanBenzMaxim 0:33d4e66780c0 106 typedef BasicIStreamWrapper<std::istream> IStreamWrapper;
IanBenzMaxim 0:33d4e66780c0 107 typedef BasicIStreamWrapper<std::wistream> WIStreamWrapper;
IanBenzMaxim 0:33d4e66780c0 108
IanBenzMaxim 0:33d4e66780c0 109 #if defined(__clang__) || defined(_MSC_VER)
IanBenzMaxim 0:33d4e66780c0 110 RAPIDJSON_DIAG_POP
IanBenzMaxim 0:33d4e66780c0 111 #endif
IanBenzMaxim 0:33d4e66780c0 112
IanBenzMaxim 0:33d4e66780c0 113 RAPIDJSON_NAMESPACE_END
IanBenzMaxim 0:33d4e66780c0 114
IanBenzMaxim 0:33d4e66780c0 115 #endif // RAPIDJSON_ISTREAMWRAPPER_H_