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/* -*- indent-tabs-mode: nil -*- */
#include "proto/tls_encoding.h"
#include <math.h>
#include <ostream>
#include <string>
using ct::DigitallySigned;
namespace cert_trans {
namespace serialization {
namespace {
SerializeResult CheckSignatureFormat(const DigitallySigned& sig) {
// This is just DCHECKED upon setting, so check again.
if (!DigitallySigned_HashAlgorithm_IsValid(sig.hash_algorithm()))
return SerializeResult::INVALID_HASH_ALGORITHM;
if (!DigitallySigned_SignatureAlgorithm_IsValid(sig.sig_algorithm()))
return SerializeResult::INVALID_SIGNATURE_ALGORITHM;
if (sig.signature().size() > constants::kMaxSignatureLength)
return SerializeResult::SIGNATURE_TOO_LONG;
return SerializeResult::OK;
}
size_t SerializedListLength(const repeated_string& in, size_t max_elem_length,
size_t max_total_length) {
size_t elem_prefix_length = internal::PrefixLength(max_elem_length);
size_t total_length = 0;
for (int i = 0; i < in.size(); ++i) {
if (in.Get(i).size() > max_elem_length ||
max_total_length - total_length < elem_prefix_length ||
max_total_length - total_length - elem_prefix_length <
in.Get(i).size())
return 0;
total_length += elem_prefix_length + in.Get(i).size();
}
return total_length + internal::PrefixLength(max_total_length);
}
} // namespace
std::ostream& operator<<(std::ostream& stream, const SerializeResult& r) {
switch (r) {
case SerializeResult::OK:
return stream << "OK";
case SerializeResult::INVALID_ENTRY_TYPE:
return stream << "INVALID_ENTRY_TYPE";
case SerializeResult::EMPTY_CERTIFICATE:
return stream << "EMPTY_CERTIFICATE";
case SerializeResult::CERTIFICATE_TOO_LONG:
return stream << "CERTIFICATE_TOO_LONG";
case SerializeResult::CERTIFICATE_CHAIN_TOO_LONG:
return stream << "CERTIFICATE_CHAIN_TOO_LONG";
case SerializeResult::INVALID_HASH_ALGORITHM:
return stream << "INVALID_HASH_ALGORITHM";
case SerializeResult::INVALID_SIGNATURE_ALGORITHM:
return stream << "INVALID_SIGNATURE_ALGORITHM";
case SerializeResult::SIGNATURE_TOO_LONG:
return stream << "SIGNATURE_TOO_LONG";
case SerializeResult::INVALID_HASH_LENGTH:
return stream << "INVALID_HASH_LENGTH";
case SerializeResult::EMPTY_PRECERTIFICATE_CHAIN:
return stream << "EMPTY_PRECERTIFICATE_CHAIN";
case SerializeResult::UNSUPPORTED_VERSION:
return stream << "UNSUPPORTED_VERSION";
case SerializeResult::EXTENSIONS_TOO_LONG:
return stream << "EXTENSIONS_TOO_LONG";
case SerializeResult::INVALID_KEYID_LENGTH:
return stream << "INVALID_KEYID_LENGTH";
case SerializeResult::EMPTY_LIST:
return stream << "EMPTY_LIST";
case SerializeResult::EMPTY_ELEM_IN_LIST:
return stream << "EMPTY_ELEM_IN_LIST";
case SerializeResult::LIST_ELEM_TOO_LONG:
return stream << "LIST_ELEM_TOO_LONG";
case SerializeResult::LIST_TOO_LONG:
return stream << "LIST_TOO_LONG";
case SerializeResult::EXTENSIONS_NOT_ORDERED:
return stream << "EXTENSIONS_NOT_ORDERED";
}
return stream << "<unknown>";
}
std::ostream& operator<<(std::ostream& stream, const DeserializeResult& r) {
switch (r) {
case DeserializeResult::OK:
return stream << "OK";
case DeserializeResult::INPUT_TOO_SHORT:
return stream << "INPUT_TOO_SHORT";
case DeserializeResult::INVALID_HASH_ALGORITHM:
return stream << "INVALID_HASH_ALGORITHM";
case DeserializeResult::INVALID_SIGNATURE_ALGORITHM:
return stream << "INVALID_SIGNATURE_ALGORITHM";
case DeserializeResult::INPUT_TOO_LONG:
return stream << "INPUT_TOO_LONG";
case DeserializeResult::UNSUPPORTED_VERSION:
return stream << "UNSUPPORTED_VERSION";
case DeserializeResult::INVALID_LIST_ENCODING:
return stream << "INVALID_LIST_ENCODING";
case DeserializeResult::EMPTY_LIST:
return stream << "EMPTY_LIST";
case DeserializeResult::EMPTY_ELEM_IN_LIST:
return stream << "EMPTY_ELEM_IN_LIST";
case DeserializeResult::UNKNOWN_LEAF_TYPE:
return stream << "UNKNOWN_LEAF_TYPE";
case DeserializeResult::UNKNOWN_LOGENTRY_TYPE:
return stream << "UNKNOWN_LOGENTRY_TYPE";
case DeserializeResult::EXTENSIONS_TOO_LONG:
return stream << "EXTENSIONS_TOO_LONG";
case DeserializeResult::EXTENSIONS_NOT_ORDERED:
return stream << "EXTENSIONS_NOT_ORDERED";
}
return stream << "<unknown>";
}
void WriteFixedBytes(const std::string& in, std::string* output) {
output->append(in);
}
void WriteVarBytes(const std::string& in, size_t max_length,
std::string* output) {
CHECK_LE(in.size(), max_length);
size_t prefix_length = internal::PrefixLength(max_length);
WriteUint(in.size(), prefix_length, output);
WriteFixedBytes(in, output);
}
SerializeResult WriteList(const repeated_string& in, size_t max_elem_length,
size_t max_total_length, std::string* output) {
for (int i = 0; i < in.size(); ++i) {
if (in.Get(i).empty())
return SerializeResult::EMPTY_ELEM_IN_LIST;
if (in.Get(i).size() > max_elem_length)
return SerializeResult::LIST_ELEM_TOO_LONG;
}
size_t length = SerializedListLength(in, max_elem_length, max_total_length);
if (length == 0)
return SerializeResult::LIST_TOO_LONG;
size_t prefix_length = internal::PrefixLength(max_total_length);
CHECK_GE(length, prefix_length);
WriteUint(length - prefix_length, prefix_length, output);
for (int i = 0; i < in.size(); ++i)
WriteVarBytes(in.Get(i), max_elem_length, output);
return SerializeResult::OK;
}
SerializeResult WriteDigitallySigned(const DigitallySigned& sig,
std::string* output) {
SerializeResult res = CheckSignatureFormat(sig);
if (res != SerializeResult::OK)
return res;
WriteUint(sig.hash_algorithm(), constants::kHashAlgorithmLengthInBytes,
output);
WriteUint(sig.sig_algorithm(), constants::kSigAlgorithmLengthInBytes,
output);
WriteVarBytes(sig.signature(), constants::kMaxSignatureLength, output);
return SerializeResult::OK;
}
namespace internal {
size_t PrefixLength(size_t max_length) {
CHECK_GT(max_length, 0U);
return ceil(log2(max_length) / float(8));
}
} // namespace internal
} // namespace serialization
} // namespace cert_trans
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