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95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
// Copyright 2015 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CRYPTO_AEAD_H_
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#define CRYPTO_AEAD_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <string>
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#include <vector>
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#include "base/containers/span.h"
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#include "base/memory/raw_ptr.h"
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#include "base/strings/string_piece.h"
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#include "crypto/crypto_export.h"
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#include "third_party/abseil-cpp/absl/types/optional.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 |base::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(base::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(base::span<const uint8_t> plaintext,
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base::span<const uint8_t> nonce,
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base::span<const uint8_t> additional_data) const;
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bool Seal(base::StringPiece plaintext,
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base::StringPiece nonce,
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base::StringPiece additional_data,
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std::string* ciphertext) const;
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absl::optional<std::vector<uint8_t>> Open(
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base::span<const uint8_t> ciphertext,
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base::span<const uint8_t> nonce,
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base::span<const uint8_t> additional_data) const;
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bool Open(base::StringPiece ciphertext,
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base::StringPiece nonce,
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base::StringPiece additional_data,
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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(base::span<const uint8_t> plaintext,
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base::span<const uint8_t> nonce,
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base::span<const uint8_t> additional_data,
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uint8_t* out,
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size_t* output_length,
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size_t max_output_length) const;
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bool Open(base::span<const uint8_t> ciphertext,
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base::span<const uint8_t> nonce,
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base::span<const uint8_t> additional_data,
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uint8_t* out,
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size_t* output_length,
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size_t max_output_length) const;
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absl::optional<base::span<const uint8_t>> key_;
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raw_ptr<const evp_aead_st> aead_;
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};
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} // namespace crypto
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#endif // CRYPTO_AEAD_H_
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