blob: 538bda9cb05453474f7787f54710ffffa87be121 [file] [log] [blame]
/*
*
* Copyright (c) 2022 Project CHIP Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdint.h>
#include <credentials/FabricTable.h>
#include <credentials/GroupDataProvider.h>
#include <lib/core/CHIPError.h>
#include <lib/support/BufferWriter.h>
#include <lib/support/Span.h>
#include "CASEDestinationId.h"
namespace chip {
using namespace chip::Crypto;
CHIP_ERROR GenerateCaseDestinationId(const ByteSpan & ipk, const ByteSpan & initiatorRandom, const ByteSpan & rootPubKey,
FabricId fabricId, NodeId nodeId, MutableByteSpan & outDestinationId)
{
VerifyOrReturnError(ipk.size() == kIPKSize, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(initiatorRandom.size() == kSigmaParamRandomNumberSize, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(rootPubKey.size() == kP256_PublicKey_Length, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(outDestinationId.size() >= kSHA256_Hash_Length, CHIP_ERROR_INVALID_ARGUMENT);
constexpr size_t kDestinationMessageLen =
kSigmaParamRandomNumberSize + kP256_PublicKey_Length + sizeof(FabricId) + sizeof(NodeId);
uint8_t destinationMessage[kDestinationMessageLen];
Encoding::LittleEndian::BufferWriter bbuf(destinationMessage, sizeof(destinationMessage));
bbuf.Put(initiatorRandom.data(), initiatorRandom.size());
bbuf.Put(rootPubKey.data(), rootPubKey.size());
bbuf.Put64(fabricId);
bbuf.Put64(nodeId);
size_t written = 0;
VerifyOrReturnError(bbuf.Fit(written), CHIP_ERROR_BUFFER_TOO_SMALL);
HMAC_sha hmac;
CHIP_ERROR err =
hmac.HMAC_SHA256(ipk.data(), ipk.size(), bbuf.Buffer(), written, outDestinationId.data(), outDestinationId.size());
if (err == CHIP_NO_ERROR)
{
outDestinationId.reduce_size(kSHA256_Hash_Length);
}
return err;
}
} // namespace chip