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Dependencies:   MaximInterface

DS2476.cpp@0:33d4e66780c0, 2017-02-24 (annotated)

Committer:
IanBenzMaxim
Date:
Fri Feb 24 11:23:12 2017 -0600
Revision:
0:33d4e66780c0
Initial commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
IanBenzMaxim 0:33d4e66780c0 1 /*******************************************************************************
IanBenzMaxim 0:33d4e66780c0 2 * Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved.
IanBenzMaxim 0:33d4e66780c0 3 *
IanBenzMaxim 0:33d4e66780c0 4 * Permission is hereby granted, free of charge, to any person obtaining a
IanBenzMaxim 0:33d4e66780c0 5 * copy of this software and associated documentation files (the "Software"),
IanBenzMaxim 0:33d4e66780c0 6 * to deal in the Software without restriction, including without limitation
IanBenzMaxim 0:33d4e66780c0 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
IanBenzMaxim 0:33d4e66780c0 8 * and/or sell copies of the Software, and to permit persons to whom the
IanBenzMaxim 0:33d4e66780c0 9 * Software is furnished to do so, subject to the following conditions:
IanBenzMaxim 0:33d4e66780c0 10 *
IanBenzMaxim 0:33d4e66780c0 11 * The above copyright notice and this permission notice shall be included
IanBenzMaxim 0:33d4e66780c0 12 * in all copies or substantial portions of the Software.
IanBenzMaxim 0:33d4e66780c0 13 *
IanBenzMaxim 0:33d4e66780c0 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
IanBenzMaxim 0:33d4e66780c0 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
IanBenzMaxim 0:33d4e66780c0 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IanBenzMaxim 0:33d4e66780c0 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
IanBenzMaxim 0:33d4e66780c0 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
IanBenzMaxim 0:33d4e66780c0 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
IanBenzMaxim 0:33d4e66780c0 20 * OTHER DEALINGS IN THE SOFTWARE.
IanBenzMaxim 0:33d4e66780c0 21 *
IanBenzMaxim 0:33d4e66780c0 22 * Except as contained in this notice, the name of Maxim Integrated
IanBenzMaxim 0:33d4e66780c0 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
IanBenzMaxim 0:33d4e66780c0 24 * Products, Inc. Branding Policy.
IanBenzMaxim 0:33d4e66780c0 25 *
IanBenzMaxim 0:33d4e66780c0 26 * The mere transfer of this software does not imply any licenses
IanBenzMaxim 0:33d4e66780c0 27 * of trade secrets, proprietary technology, copyrights, patents,
IanBenzMaxim 0:33d4e66780c0 28 * trademarks, maskwork rights, or any other form of intellectual
IanBenzMaxim 0:33d4e66780c0 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
IanBenzMaxim 0:33d4e66780c0 30 * ownership rights.
IanBenzMaxim 0:33d4e66780c0 31 *******************************************************************************/
IanBenzMaxim 0:33d4e66780c0 32
IanBenzMaxim 0:33d4e66780c0 33 #include <I2C.h>
IanBenzMaxim 0:33d4e66780c0 34 #include <wait_api.h>
IanBenzMaxim 0:33d4e66780c0 35 #include "DS2476.hpp"
IanBenzMaxim 0:33d4e66780c0 36
IanBenzMaxim 0:33d4e66780c0 37 // DS2476 additional commands.
IanBenzMaxim 0:33d4e66780c0 38 enum Command
IanBenzMaxim 0:33d4e66780c0 39 {
IanBenzMaxim 0:33d4e66780c0 40 GenerateEcdsaSignature = 0x1E,
IanBenzMaxim 0:33d4e66780c0 41 ComputeSha2UniqueSecret = 0x55,
IanBenzMaxim 0:33d4e66780c0 42 ComputeSha2Hmac = 0x2D
IanBenzMaxim 0:33d4e66780c0 43 };
IanBenzMaxim 0:33d4e66780c0 44
IanBenzMaxim 0:33d4e66780c0 45 DS2476::CmdResult DS2476::generateEcdsaSignature(KeyNum keyNum, Signature & signature)
IanBenzMaxim 0:33d4e66780c0 46 {
IanBenzMaxim 0:33d4e66780c0 47 if (keyNum == KeyNumS)
IanBenzMaxim 0:33d4e66780c0 48 {
IanBenzMaxim 0:33d4e66780c0 49 return InvalidParameterError;
IanBenzMaxim 0:33d4e66780c0 50 }
IanBenzMaxim 0:33d4e66780c0 51
IanBenzMaxim 0:33d4e66780c0 52 Buffer buffer;
IanBenzMaxim 0:33d4e66780c0 53 buffer.push_back(keyNum);
IanBenzMaxim 0:33d4e66780c0 54 CmdResult result = writeCommand(GenerateEcdsaSignature, buffer);
IanBenzMaxim 0:33d4e66780c0 55 if (result == Success)
IanBenzMaxim 0:33d4e66780c0 56 {
IanBenzMaxim 0:33d4e66780c0 57 wait_ms(generateEcdsaSignatureTimeMs);
IanBenzMaxim 0:33d4e66780c0 58 result = readResponse(buffer);
IanBenzMaxim 0:33d4e66780c0 59 if (result == Success)
IanBenzMaxim 0:33d4e66780c0 60 {
IanBenzMaxim 0:33d4e66780c0 61 if (buffer.size() == (1 + signature.r.size() + signature.s.size()))
IanBenzMaxim 0:33d4e66780c0 62 {
IanBenzMaxim 0:33d4e66780c0 63 result = convertResultByte(buffer[0]);
IanBenzMaxim 0:33d4e66780c0 64 Buffer::const_iterator begin = buffer.begin() + 1;
IanBenzMaxim 0:33d4e66780c0 65 Buffer::const_iterator end = begin + signature.s.size();
IanBenzMaxim 0:33d4e66780c0 66 std::copy(begin, end, signature.s.begin());
IanBenzMaxim 0:33d4e66780c0 67 begin = end;
IanBenzMaxim 0:33d4e66780c0 68 end = begin + signature.r.size();
IanBenzMaxim 0:33d4e66780c0 69 std::copy(begin, end, signature.r.begin());
IanBenzMaxim 0:33d4e66780c0 70 }
IanBenzMaxim 0:33d4e66780c0 71 else
IanBenzMaxim 0:33d4e66780c0 72 {
IanBenzMaxim 0:33d4e66780c0 73 result = CommunicationError;
IanBenzMaxim 0:33d4e66780c0 74 }
IanBenzMaxim 0:33d4e66780c0 75 }
IanBenzMaxim 0:33d4e66780c0 76 }
IanBenzMaxim 0:33d4e66780c0 77 return result;
IanBenzMaxim 0:33d4e66780c0 78 }
IanBenzMaxim 0:33d4e66780c0 79
IanBenzMaxim 0:33d4e66780c0 80 DS2476::CmdResult DS2476::computeSha2UniqueSecret(SecretNum msecretNum)
IanBenzMaxim 0:33d4e66780c0 81 {
IanBenzMaxim 0:33d4e66780c0 82 Buffer buffer;
IanBenzMaxim 0:33d4e66780c0 83 buffer.push_back(msecretNum << 4);
IanBenzMaxim 0:33d4e66780c0 84 CmdResult result = writeCommand(ComputeSha2UniqueSecret, buffer);
IanBenzMaxim 0:33d4e66780c0 85 if (result == Success)
IanBenzMaxim 0:33d4e66780c0 86 {
IanBenzMaxim 0:33d4e66780c0 87 wait_ms(sha256ComputationTimeMs);
IanBenzMaxim 0:33d4e66780c0 88 result = readResponse(buffer);
IanBenzMaxim 0:33d4e66780c0 89 if (result == Success)
IanBenzMaxim 0:33d4e66780c0 90 {
IanBenzMaxim 0:33d4e66780c0 91 if (buffer.size() == 1)
IanBenzMaxim 0:33d4e66780c0 92 {
IanBenzMaxim 0:33d4e66780c0 93 convertResultByte(buffer[0]);
IanBenzMaxim 0:33d4e66780c0 94 }
IanBenzMaxim 0:33d4e66780c0 95 else
IanBenzMaxim 0:33d4e66780c0 96 {
IanBenzMaxim 0:33d4e66780c0 97 result = CommunicationError;
IanBenzMaxim 0:33d4e66780c0 98 }
IanBenzMaxim 0:33d4e66780c0 99 }
IanBenzMaxim 0:33d4e66780c0 100 }
IanBenzMaxim 0:33d4e66780c0 101 return result;
IanBenzMaxim 0:33d4e66780c0 102 }
IanBenzMaxim 0:33d4e66780c0 103
IanBenzMaxim 0:33d4e66780c0 104 DS2476::CmdResult DS2476::computeSha2Hmac(HMAC & hmac)
IanBenzMaxim 0:33d4e66780c0 105 {
IanBenzMaxim 0:33d4e66780c0 106 Buffer buffer;
IanBenzMaxim 0:33d4e66780c0 107 CmdResult result = writeCommand(ComputeSha2Hmac, buffer);
IanBenzMaxim 0:33d4e66780c0 108 if (result == Success)
IanBenzMaxim 0:33d4e66780c0 109 {
IanBenzMaxim 0:33d4e66780c0 110 wait_ms(sha256ComputationTimeMs);
IanBenzMaxim 0:33d4e66780c0 111 result = readResponse(buffer);
IanBenzMaxim 0:33d4e66780c0 112 if (result == Success)
IanBenzMaxim 0:33d4e66780c0 113 {
IanBenzMaxim 0:33d4e66780c0 114 if (buffer.size() == (1 + hmac.size()))
IanBenzMaxim 0:33d4e66780c0 115 {
IanBenzMaxim 0:33d4e66780c0 116 result = convertResultByte(buffer[0]);
IanBenzMaxim 0:33d4e66780c0 117 std::copy(buffer.begin() + 1, buffer.end(), hmac.begin());
IanBenzMaxim 0:33d4e66780c0 118 }
IanBenzMaxim 0:33d4e66780c0 119 else
IanBenzMaxim 0:33d4e66780c0 120 {
IanBenzMaxim 0:33d4e66780c0 121 result = CommunicationError;
IanBenzMaxim 0:33d4e66780c0 122 }
IanBenzMaxim 0:33d4e66780c0 123 }
IanBenzMaxim 0:33d4e66780c0 124 }
IanBenzMaxim 0:33d4e66780c0 125 return result;
IanBenzMaxim 0:33d4e66780c0 126 }