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/* -*- indent-tabs-mode: nil -*- */
#include "proto/xjson_serializer.h"
#include <glog/logging.h>
#include <math.h>
#include <objecthash.h>
#include <string>
#include "proto/ct.pb.h"
#include "proto/serializer.h"
using cert_trans::serialization::SerializeResult;
using cert_trans::serialization::DeserializeResult;
using cert_trans::serialization::WriteDigitallySigned;
using cert_trans::serialization::WriteFixedBytes;
using cert_trans::serialization::WriteUint;
using cert_trans::serialization::WriteVarBytes;
using ct::DigitallySigned;
using ct::DigitallySigned_HashAlgorithm_IsValid;
using ct::DigitallySigned_SignatureAlgorithm_IsValid;
using ct::LogEntry;
using ct::LogEntryType_IsValid;
using ct::MerkleTreeLeaf;
using ct::SignedCertificateTimestamp;
using ct::SignedCertificateTimestampList;
using ct::SthExtension;
using ct::SctExtension;
using ct::Version_IsValid;
using google::protobuf::RepeatedPtrField;
using std::string;
namespace {
const size_t kMaxJsonLength = (1 << 24) - 1;
SerializeResult CheckJsonFormat(const string& json) {
if (json.empty())
return SerializeResult::EMPTY_CERTIFICATE;
if (json.size() > kMaxJsonLength)
return SerializeResult::CERTIFICATE_TOO_LONG;
return SerializeResult::OK;
}
string V1LeafData(const LogEntry& entry) {
CHECK(entry.has_x_json_entry());
return entry.x_json_entry().json();
}
SerializeResult SerializeV1SCTSignatureInput(
const SignedCertificateTimestamp& sct, const LogEntry& entry,
string* result) {
CHECK_NOTNULL(result);
if (sct.version() != ct::V1) {
return SerializeResult::UNSUPPORTED_VERSION;
}
const string json(entry.x_json_entry().json());
SerializeResult res = CheckJsonFormat(json);
if (res != SerializeResult::OK) {
return res;
}
const string extensions(sct.extensions());
res = CheckExtensionsFormat(extensions);
if (res != SerializeResult::OK) {
return res;
}
result->clear();
WriteUint(ct::V1, Serializer::kVersionLengthInBytes, result);
WriteUint(ct::CERTIFICATE_TIMESTAMP, Serializer::kSignatureTypeLengthInBytes,
result);
WriteUint(sct.timestamp(), Serializer::kTimestampLengthInBytes, result);
WriteUint(ct::X_JSON_ENTRY, Serializer::kLogEntryTypeLengthInBytes, result);
WriteVarBytes(json, kMaxJsonLength, result);
WriteVarBytes(extensions, Serializer::kMaxExtensionsLength, result);
return SerializeResult::OK;
}
SerializeResult SerializeV1SCTMerkleTreeLeaf(
const ct::SignedCertificateTimestamp& sct, const ct::LogEntry& entry,
string* result) {
CHECK_NOTNULL(result);
if (sct.version() != ct::V1) {
return SerializeResult::UNSUPPORTED_VERSION;
}
const string json(entry.x_json_entry().json());
SerializeResult res = CheckJsonFormat(json);
if (res != SerializeResult::OK) {
return res;
}
const string extensions(sct.extensions());
res = CheckExtensionsFormat(extensions);
if (res != SerializeResult::OK) {
return res;
}
result->clear();
WriteUint(ct::V1, Serializer::kVersionLengthInBytes, result);
WriteUint(ct::TIMESTAMPED_ENTRY, Serializer::kMerkleLeafTypeLengthInBytes,
result);
WriteUint(sct.timestamp(), Serializer::kTimestampLengthInBytes, result);
WriteUint(ct::X_JSON_ENTRY, Serializer::kLogEntryTypeLengthInBytes, result);
WriteVarBytes(json, kMaxJsonLength, result);
WriteVarBytes(extensions, Serializer::kMaxExtensionsLength, result);
return SerializeResult::OK;
}
DeserializeResult DeserializeV1SCTMerkleTreeLeaf(TLSDeserializer* des,
MerkleTreeLeaf* leaf) {
CHECK_NOTNULL(des);
CHECK_NOTNULL(leaf);
unsigned int version;
if (!des->ReadUint(Serializer::kVersionLengthInBytes, &version)) {
return DeserializeResult::INPUT_TOO_SHORT;
}
if (version != ct::V1) {
return DeserializeResult::UNSUPPORTED_VERSION;
}
leaf->set_version(ct::V1);
unsigned int type;
if (!des->ReadUint(Serializer::kMerkleLeafTypeLengthInBytes, &type)) {
return DeserializeResult::INPUT_TOO_SHORT;
}
if (type != ct::TIMESTAMPED_ENTRY) {
return DeserializeResult::UNKNOWN_LEAF_TYPE;
}
leaf->set_type(ct::TIMESTAMPED_ENTRY);
ct::TimestampedEntry* const entry = leaf->mutable_timestamped_entry();
uint64_t timestamp;
if (!des->ReadUint(Serializer::kTimestampLengthInBytes, ×tamp)) {
return DeserializeResult::INPUT_TOO_SHORT;
}
entry->set_timestamp(timestamp);
unsigned int entry_type;
if (!des->ReadUint(Serializer::kLogEntryTypeLengthInBytes, &entry_type)) {
return DeserializeResult::INPUT_TOO_SHORT;
}
CHECK(LogEntryType_IsValid(entry_type));
entry->set_entry_type(static_cast<ct::LogEntryType>(entry_type));
switch (entry_type) {
case ct::X_JSON_ENTRY: {
string json;
if (!des->ReadVarBytes(kMaxJsonLength, &json)) {
return DeserializeResult::INPUT_TOO_SHORT;
}
entry->mutable_signed_entry()->set_json(json);
return des->ReadExtensions(entry);
}
case ct::UNKNOWN_ENTRY_TYPE: {
// handled below.
break;
}
}
return DeserializeResult::UNKNOWN_LOGENTRY_TYPE;
}
} // namespace
void ConfigureSerializerForV1XJSON() {
Serializer::ConfigureV1(V1LeafData, SerializeV1SCTSignatureInput,
SerializeV1SCTMerkleTreeLeaf);
Deserializer::Configure(DeserializeV1SCTMerkleTreeLeaf);
}
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