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// Copyright 2018 Google LLC
//
// 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 "tink/subtle/wycheproof_util.h"
#include <fstream>
#include <iostream>
#include <memory>
#include <ostream>
#include <string>
#include "absl/status/status.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"
#include "include/rapidjson/document.h"
#include "include/rapidjson/istreamwrapper.h"
#include "tink/internal/test_file_util.h"
#include "tink/subtle/common_enums.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
namespace crypto {
namespace tink {
namespace subtle {
namespace {
// TODO(tholenst): factor these helpers out to an "util"-class.
util::StatusOr<std::string> HexDecode(absl::string_view hex) {
if (hex.size() % 2 != 0) {
return util::Status(absl::StatusCode::kInvalidArgument,
"Input has odd size.");
}
std::string decoded(hex.size() / 2, static_cast<char>(0));
for (size_t i = 0; i < hex.size(); ++i) {
char c = hex[i];
char val;
if ('0' <= c && c <= '9')
val = c - '0';
else if ('a' <= c && c <= 'f')
val = c - 'a' + 10;
else if ('A' <= c && c <= 'F')
val = c - 'A' + 10;
else
return util::Status(absl::StatusCode::kInvalidArgument,
"Not hexadecimal");
decoded[i / 2] = (decoded[i / 2] << 4) | val;
}
return decoded;
}
std::string HexDecodeOrDie(absl::string_view hex) {
return HexDecode(hex).value();
}
} // namespace
std::string WycheproofUtil::GetBytes(const rapidjson::Value &val) {
std::string s(val.GetString());
if (s.size() % 2 != 0) {
// ECDH private key may have odd length.
s = "0" + s;
}
return HexDecodeOrDie(s);
}
std::unique_ptr<rapidjson::Document> WycheproofUtil::ReadTestVectors(
const std::string &filename) {
std::string test_vectors_path = crypto::tink::internal::RunfilesPath(
absl::StrCat("testvectors/", filename));
std::ifstream input_stream;
input_stream.open(test_vectors_path);
rapidjson::IStreamWrapper input(input_stream);
std::unique_ptr<rapidjson::Document> root(
new rapidjson::Document(rapidjson::kObjectType));
if (root->ParseStream(input).HasParseError()) {
std::cerr << "Failure parsing of test vectors from "
<< test_vectors_path << std::endl;
exit(1);
}
return root;
}
HashType WycheproofUtil::GetHashType(const rapidjson::Value &val) {
std::string md(val.GetString());
if (md == "SHA-1") {
return HashType::SHA1;
} else if (md == "SHA-256") {
return HashType::SHA256;
} else if (md == "SHA-384") {
return HashType::UNKNOWN_HASH;
} else if (md == "SHA-512") {
return HashType::SHA512;
} else {
return HashType::UNKNOWN_HASH;
}
}
EllipticCurveType WycheproofUtil::GetEllipticCurveType(
const rapidjson::Value &val) {
std::string curve(val.GetString());
if (curve == "secp256r1") {
return EllipticCurveType::NIST_P256;
} else if (curve == "secp384r1") {
return EllipticCurveType::NIST_P384;
} else if (curve == "secp521r1") {
return EllipticCurveType::NIST_P521;
} else {
return EllipticCurveType::UNKNOWN_CURVE;
}
}
std::string WycheproofUtil::GetInteger(const rapidjson::Value &val) {
std::string hex(val.GetString());
// Since val is a hexadecimal integer it can have an odd length.
if (hex.size() % 2 == 1) {
// Avoid a leading 0 byte.
if (hex[0] == '0') {
hex = std::string(hex, 1, hex.size() - 1);
} else {
hex = "0" + hex;
}
}
return HexDecode(hex).value();
}
} // namespace subtle
} // namespace tink
} // namespace crypto
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