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

Committer:
IanBenzMaxim
Date:
Thu Oct 03 11:40:13 2019 -0500
Revision:
16:a004191a79ab
Parent:
rapidjson/filereadstream.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_FILEREADSTREAM_H_
IanBenzMaxim 0:33d4e66780c0 16 #define RAPIDJSON_FILEREADSTREAM_H_
IanBenzMaxim 0:33d4e66780c0 17
IanBenzMaxim 0:33d4e66780c0 18 #include "stream.h"
IanBenzMaxim 0:33d4e66780c0 19 #include <cstdio>
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 RAPIDJSON_DIAG_OFF(unreachable-code)
IanBenzMaxim 0:33d4e66780c0 25 RAPIDJSON_DIAG_OFF(missing-noreturn)
IanBenzMaxim 0:33d4e66780c0 26 #endif
IanBenzMaxim 0:33d4e66780c0 27
IanBenzMaxim 0:33d4e66780c0 28 RAPIDJSON_NAMESPACE_BEGIN
IanBenzMaxim 0:33d4e66780c0 29
IanBenzMaxim 0:33d4e66780c0 30 //! File byte stream for input using fread().
IanBenzMaxim 0:33d4e66780c0 31 /*!
IanBenzMaxim 0:33d4e66780c0 32 \note implements Stream concept
IanBenzMaxim 0:33d4e66780c0 33 */
IanBenzMaxim 0:33d4e66780c0 34 class FileReadStream {
IanBenzMaxim 0:33d4e66780c0 35 public:
IanBenzMaxim 0:33d4e66780c0 36 typedef char Ch; //!< Character type (byte).
IanBenzMaxim 0:33d4e66780c0 37
IanBenzMaxim 0:33d4e66780c0 38 //! Constructor.
IanBenzMaxim 0:33d4e66780c0 39 /*!
IanBenzMaxim 0:33d4e66780c0 40 \param fp File pointer opened for read.
IanBenzMaxim 0:33d4e66780c0 41 \param buffer user-supplied buffer.
IanBenzMaxim 0:33d4e66780c0 42 \param bufferSize size of buffer in bytes. Must >=4 bytes.
IanBenzMaxim 0:33d4e66780c0 43 */
IanBenzMaxim 0:33d4e66780c0 44 FileReadStream(std::FILE* fp, char* buffer, size_t bufferSize) : fp_(fp), buffer_(buffer), bufferSize_(bufferSize), bufferLast_(0), current_(buffer_), readCount_(0), count_(0), eof_(false) {
IanBenzMaxim 0:33d4e66780c0 45 RAPIDJSON_ASSERT(fp_ != 0);
IanBenzMaxim 0:33d4e66780c0 46 RAPIDJSON_ASSERT(bufferSize >= 4);
IanBenzMaxim 0:33d4e66780c0 47 Read();
IanBenzMaxim 0:33d4e66780c0 48 }
IanBenzMaxim 0:33d4e66780c0 49
IanBenzMaxim 0:33d4e66780c0 50 Ch Peek() const { return *current_; }
IanBenzMaxim 0:33d4e66780c0 51 Ch Take() { Ch c = *current_; Read(); return c; }
IanBenzMaxim 0:33d4e66780c0 52 size_t Tell() const { return count_ + static_cast<size_t>(current_ - buffer_); }
IanBenzMaxim 0:33d4e66780c0 53
IanBenzMaxim 0:33d4e66780c0 54 // Not implemented
IanBenzMaxim 0:33d4e66780c0 55 void Put(Ch) { RAPIDJSON_ASSERT(false); }
IanBenzMaxim 0:33d4e66780c0 56 void Flush() { RAPIDJSON_ASSERT(false); }
IanBenzMaxim 0:33d4e66780c0 57 Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
IanBenzMaxim 0:33d4e66780c0 58 size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
IanBenzMaxim 0:33d4e66780c0 59
IanBenzMaxim 0:33d4e66780c0 60 // For encoding detection only.
IanBenzMaxim 0:33d4e66780c0 61 const Ch* Peek4() const {
IanBenzMaxim 0:33d4e66780c0 62 return (current_ + 4 <= bufferLast_) ? current_ : 0;
IanBenzMaxim 0:33d4e66780c0 63 }
IanBenzMaxim 0:33d4e66780c0 64
IanBenzMaxim 0:33d4e66780c0 65 private:
IanBenzMaxim 0:33d4e66780c0 66 void Read() {
IanBenzMaxim 0:33d4e66780c0 67 if (current_ < bufferLast_)
IanBenzMaxim 0:33d4e66780c0 68 ++current_;
IanBenzMaxim 0:33d4e66780c0 69 else if (!eof_) {
IanBenzMaxim 0:33d4e66780c0 70 count_ += readCount_;
IanBenzMaxim 0:33d4e66780c0 71 readCount_ = fread(buffer_, 1, bufferSize_, fp_);
IanBenzMaxim 0:33d4e66780c0 72 bufferLast_ = buffer_ + readCount_ - 1;
IanBenzMaxim 0:33d4e66780c0 73 current_ = buffer_;
IanBenzMaxim 0:33d4e66780c0 74
IanBenzMaxim 0:33d4e66780c0 75 if (readCount_ < bufferSize_) {
IanBenzMaxim 0:33d4e66780c0 76 buffer_[readCount_] = '\0';
IanBenzMaxim 0:33d4e66780c0 77 ++bufferLast_;
IanBenzMaxim 0:33d4e66780c0 78 eof_ = true;
IanBenzMaxim 0:33d4e66780c0 79 }
IanBenzMaxim 0:33d4e66780c0 80 }
IanBenzMaxim 0:33d4e66780c0 81 }
IanBenzMaxim 0:33d4e66780c0 82
IanBenzMaxim 0:33d4e66780c0 83 std::FILE* fp_;
IanBenzMaxim 0:33d4e66780c0 84 Ch *buffer_;
IanBenzMaxim 0:33d4e66780c0 85 size_t bufferSize_;
IanBenzMaxim 0:33d4e66780c0 86 Ch *bufferLast_;
IanBenzMaxim 0:33d4e66780c0 87 Ch *current_;
IanBenzMaxim 0:33d4e66780c0 88 size_t readCount_;
IanBenzMaxim 0:33d4e66780c0 89 size_t count_; //!< Number of characters read
IanBenzMaxim 0:33d4e66780c0 90 bool eof_;
IanBenzMaxim 0:33d4e66780c0 91 };
IanBenzMaxim 0:33d4e66780c0 92
IanBenzMaxim 0:33d4e66780c0 93 RAPIDJSON_NAMESPACE_END
IanBenzMaxim 0:33d4e66780c0 94
IanBenzMaxim 0:33d4e66780c0 95 #ifdef __clang__
IanBenzMaxim 0:33d4e66780c0 96 RAPIDJSON_DIAG_POP
IanBenzMaxim 0:33d4e66780c0 97 #endif
IanBenzMaxim 0:33d4e66780c0 98
IanBenzMaxim 0:33d4e66780c0 99 #endif // RAPIDJSON_FILESTREAM_H_