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// Copyright 2018 Google Inc.
//
// 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.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef TINK_SUBTLE_XCHACHA20_POLY1305_BORINGSSL_H_
#define TINK_SUBTLE_XCHACHA20_POLY1305_BORINGSSL_H_
#include <memory>
#include <utility>
#include "absl/strings/string_view.h"
#include "openssl/base.h"
#include "tink/aead.h"
#include "tink/internal/fips_utils.h"
#include "tink/util/secret_data.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
namespace crypto {
namespace tink {
namespace subtle {
class XChacha20Poly1305BoringSsl : public Aead {
public:
// Constructs a new Aead cipher for XChacha20-Poly1305.
// Currently supported key size is 256 bits.
// Currently supported nonce size is 24 bytes.
// The tag size is fixed to 16 bytes.
static crypto::tink::util::StatusOr<std::unique_ptr<Aead>> New(
util::SecretData key);
crypto::tink::util::StatusOr<std::string> Encrypt(
absl::string_view plaintext,
absl::string_view additional_data) const override;
crypto::tink::util::StatusOr<std::string> Decrypt(
absl::string_view ciphertext,
absl::string_view additional_data) const override;
static constexpr crypto::tink::internal::FipsCompatibility kFipsStatus =
crypto::tink::internal::FipsCompatibility::kNotFips;
private:
// The following constants are in bytes.
static constexpr int kNonceSize = 24;
static constexpr int kTagSize = 16;
XChacha20Poly1305BoringSsl(util::SecretData key, const EVP_AEAD* aead)
: key_(std::move(key)), aead_(aead) {}
const util::SecretData key_;
const EVP_AEAD* const aead_;
};
} // namespace subtle
} // namespace tink
} // namespace crypto
#endif // TINK_SUBTLE_XCHACHA20_POLY1305_BORINGSSL_H_