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96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_AEAD_H_
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#define THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_AEAD_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <optional>
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#include <string>
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#include <vector>
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#include "absl/strings/string_view.h"
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#include "absl/types/optional.h"
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#include "absl/types/span.h"
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#include "internal/crypto/crypto_export.h"
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struct evp_aead_st;
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namespace crypto {
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// This class exposes the AES-128-CTR-HMAC-SHA256 and AES_256_GCM AEAD. Note
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// that there are two versions of most methods: an historical version based
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// around |StringPiece| and a more modern version that takes |absl::Span|.
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// Prefer the latter in new code.
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class CRYPTO_EXPORT Aead {
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public:
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enum AeadAlgorithm {
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AES_128_CTR_HMAC_SHA256,
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AES_256_GCM,
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AES_256_GCM_SIV,
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CHACHA20_POLY1305
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};
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explicit Aead(AeadAlgorithm algorithm);
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Aead(const Aead&) = delete;
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Aead& operator=(const Aead&) = delete;
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~Aead();
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// Note that Init keeps a reference to the data pointed to by |key| thus that
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// data must outlive this object.
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void Init(absl::Span<const uint8_t> key);
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// Note that Init keeps a reference to the data pointed to by |key| thus that
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// data must outlive this object.
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void Init(const std::string* key);
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std::vector<uint8_t> Seal(absl::Span<const uint8_t> plaintext,
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absl::Span<const uint8_t> nonce,
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absl::Span<const uint8_t> additional_data) const;
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bool Seal(absl::string_view plaintext, absl::string_view nonce,
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absl::string_view additional_data, std::string* ciphertext) const;
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absl::optional<std::vector<uint8_t>> Open(
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absl::Span<const uint8_t> ciphertext, absl::Span<const uint8_t> nonce,
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absl::Span<const uint8_t> additional_data) const;
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bool Open(absl::string_view ciphertext, absl::string_view nonce,
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absl::string_view additional_data, std::string* plaintext) const;
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size_t KeyLength() const;
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size_t NonceLength() const;
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private:
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bool Seal(absl::Span<const uint8_t> plaintext,
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absl::Span<const uint8_t> nonce,
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absl::Span<const uint8_t> additional_data, uint8_t* out,
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size_t* output_length, size_t max_output_length) const;
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bool Open(absl::Span<const uint8_t> ciphertext,
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absl::Span<const uint8_t> nonce,
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absl::Span<const uint8_t> additional_data, uint8_t* out,
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size_t* output_length, size_t max_output_length) const;
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absl::optional<absl::Span<const uint8_t>> key_;
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const evp_aead_st* aead_;
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};
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} // namespace crypto
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#endif // THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_AEAD_H_
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