3 * Copyright (c) 2020 Project CHIP Authors
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
20 * This file implements a QRCode Setup Payload generator in accordance
21 * with the CHIP specification.
25 #include "QRCodeSetupPayloadGenerator.h"
28 #include <core/CHIPCore.h>
29 #include <core/CHIPTLV.h>
30 #include <core/CHIPTLVData.hpp>
31 #include <core/CHIPTLVDebug.hpp>
32 #include <core/CHIPTLVUtilities.hpp>
33 #include <protocols/Protocols.h>
34 #include <support/CodeUtils.h>
35 #include <support/RandUtils.h>
42 // Populates numberOfBits starting from LSB of input into bits, which is assumed to be zero-initialized
43 static CHIP_ERROR populateBits(uint8_t * bits, size_t & offset, uint64_t input, size_t numberOfBits,
44 size_t totalPayloadDataSizeInBits)
46 CHIP_ERROR err = CHIP_NO_ERROR;
49 VerifyOrExit(offset + numberOfBits <= totalPayloadDataSizeInBits, err = CHIP_ERROR_INVALID_ARGUMENT);
50 VerifyOrExit(input < 1u << numberOfBits, err = CHIP_ERROR_INVALID_ARGUMENT);
53 offset += numberOfBits;
58 bits[index / 8] |= static_cast<uint8_t>(1 << index % 8);
67 static CHIP_ERROR populateTLVBits(uint8_t * bits, size_t & offset, const uint8_t * tlvBuf, size_t tlvBufSizeInBytes,
68 size_t totalPayloadDataSizeInBits)
70 CHIP_ERROR err = CHIP_NO_ERROR;
71 for (size_t i = 0; i < tlvBufSizeInBytes; i++)
73 uint8_t value = tlvBuf[i];
74 err = populateBits(bits, offset, value, 8, totalPayloadDataSizeInBits);
75 if (err != CHIP_NO_ERROR)
83 CHIP_ERROR writeTag(TLV::TLVWriter & writer, uint64_t tag, OptionalQRCodeInfo & info)
85 CHIP_ERROR err = CHIP_NO_ERROR;
87 if (info.type == optionalQRCodeInfoTypeString)
89 err = writer.PutString(tag, info.data.c_str());
91 else if (info.type == optionalQRCodeInfoTypeInt32)
93 err = writer.Put(tag, info.int32);
97 err = CHIP_ERROR_INVALID_ARGUMENT;
103 CHIP_ERROR writeTag(TLV::TLVWriter & writer, uint64_t tag, OptionalQRCodeInfoExtension & info)
105 CHIP_ERROR err = CHIP_NO_ERROR;
107 if (info.type == optionalQRCodeInfoTypeString || info.type == optionalQRCodeInfoTypeInt32)
109 err = writeTag(writer, tag, static_cast<OptionalQRCodeInfo &>(info));
111 else if (info.type == optionalQRCodeInfoTypeInt64)
113 err = writer.Put(tag, info.int64);
115 else if (info.type == optionalQRCodeInfoTypeUInt32)
117 err = writer.Put(tag, info.uint32);
119 else if (info.type == optionalQRCodeInfoTypeUInt64)
121 err = writer.Put(tag, info.uint64);
125 err = CHIP_ERROR_INVALID_ARGUMENT;
131 CHIP_ERROR QRCodeSetupPayloadGenerator::generateTLVFromOptionalData(SetupPayload & outPayload, uint8_t * tlvDataStart,
132 uint32_t maxLen, size_t & tlvDataLengthInBytes)
134 CHIP_ERROR err = CHIP_NO_ERROR;
135 std::vector<OptionalQRCodeInfo> optionalData = outPayload.getAllOptionalVendorData();
136 std::vector<OptionalQRCodeInfoExtension> optionalExtensionData = outPayload.getAllOptionalExtensionData();
137 VerifyOrExit(!optionalData.empty() || !optionalExtensionData.empty(), err = CHIP_NO_ERROR);
139 TLV::TLVWriter rootWriter;
140 rootWriter.Init(tlvDataStart, maxLen);
142 TLV::TLVWriter innerStructureWriter;
144 err = rootWriter.OpenContainer(TLV::AnonymousTag, TLV::kTLVType_Structure, innerStructureWriter);
147 for (OptionalQRCodeInfo info : optionalData)
149 err = writeTag(innerStructureWriter, TLV::ContextTag(info.tag), info);
153 for (OptionalQRCodeInfoExtension info : optionalExtensionData)
155 err = writeTag(innerStructureWriter, TLV::ContextTag(info.tag), info);
159 err = rootWriter.CloseContainer(innerStructureWriter);
162 err = rootWriter.Finalize();
165 tlvDataLengthInBytes = rootWriter.GetLengthWritten();
171 static CHIP_ERROR generateBitSet(SetupPayload & payload, uint8_t * bits, uint8_t * tlvDataStart, size_t tlvDataLengthInBytes)
173 CHIP_ERROR err = CHIP_NO_ERROR;
175 size_t totalPayloadSizeInBits = kTotalPayloadDataSizeInBits + (tlvDataLengthInBytes * 8);
176 err = populateBits(bits, offset, payload.version, kVersionFieldLengthInBits, kTotalPayloadDataSizeInBits);
177 err = populateBits(bits, offset, payload.vendorID, kVendorIDFieldLengthInBits, kTotalPayloadDataSizeInBits);
178 err = populateBits(bits, offset, payload.productID, kProductIDFieldLengthInBits, kTotalPayloadDataSizeInBits);
179 err = populateBits(bits, offset, payload.requiresCustomFlow, kCustomFlowRequiredFieldLengthInBits, kTotalPayloadDataSizeInBits);
180 err = populateBits(bits, offset, static_cast<uint16_t>(payload.rendezvousInformation), kRendezvousInfoFieldLengthInBits,
181 kTotalPayloadDataSizeInBits);
182 err = populateBits(bits, offset, payload.discriminator, kPayloadDiscriminatorFieldLengthInBits, kTotalPayloadDataSizeInBits);
183 err = populateBits(bits, offset, payload.setUpPINCode, kSetupPINCodeFieldLengthInBits, kTotalPayloadDataSizeInBits);
184 err = populateBits(bits, offset, 0, kPaddingFieldLengthInBits, kTotalPayloadDataSizeInBits);
185 err = populateTLVBits(bits, offset, tlvDataStart, tlvDataLengthInBytes, totalPayloadSizeInBits);
189 // TODO: issue #3663 - Unbounded stack in payloadBase41RepresentationWithTLV()
190 #if !defined(__clang__)
191 #pragma GCC diagnostic push
192 #pragma GCC diagnostic ignored "-Wstack-usage="
195 static CHIP_ERROR payloadBase41RepresentationWithTLV(SetupPayload & setupPayload, std::string & base41Representation,
196 size_t bitsetSize, uint8_t * tlvDataStart, size_t tlvDataLengthInBytes)
198 uint8_t bits[bitsetSize];
199 memset(bits, 0, bitsetSize);
200 std::string encodedPayload;
201 CHIP_ERROR err = generateBitSet(setupPayload, bits, tlvDataStart, tlvDataLengthInBytes);
204 encodedPayload = base41Encode(bits, ArraySize(bits));
205 encodedPayload.insert(0, kQRCodePrefix);
206 base41Representation = encodedPayload;
211 CHIP_ERROR QRCodeSetupPayloadGenerator::payloadBase41Representation(std::string & base41Representation)
213 // 6.1.2.2. Table: Packed Binary Data Structure
214 // The TLV Data should be 0 length if TLV is not included.
215 return payloadBase41Representation(base41Representation, nullptr, 0);
218 CHIP_ERROR QRCodeSetupPayloadGenerator::payloadBase41Representation(std::string & base41Representation, uint8_t * tlvDataStart,
219 uint32_t tlvDataStartSize)
221 CHIP_ERROR err = CHIP_NO_ERROR;
222 size_t tlvDataLengthInBytes = 0;
224 VerifyOrExit(mPayload.isValidQRCodePayload(), err = CHIP_ERROR_INVALID_ARGUMENT);
225 err = generateTLVFromOptionalData(mPayload, tlvDataStart, tlvDataStartSize, tlvDataLengthInBytes);
228 err = payloadBase41RepresentationWithTLV(mPayload, base41Representation, kTotalPayloadDataSizeInBytes + tlvDataLengthInBytes,
229 tlvDataStart, tlvDataLengthInBytes);
236 #if !defined(__clang__)
237 #pragma GCC diagnostic pop // -Wstack-usage