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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef NET_QUIC_CRYPTO_AEAD_BASE_ENCRYPTER_H_ | |
| 6 #define NET_QUIC_CRYPTO_AEAD_BASE_ENCRYPTER_H_ | |
| 7 | |
| 8 #include <stddef.h> | |
| 9 | |
| 10 #include "base/compiler_specific.h" | |
| 11 #include "base/macros.h" | |
| 12 #include "net/quic/crypto/quic_encrypter.h" | |
| 13 #include "net/quic/crypto/scoped_evp_aead_ctx.h" | |
| 14 | |
| 15 namespace net { | |
| 16 | |
| 17 // AeadBaseEncrypter is the base class of AEAD QuicEncrypter subclasses. | |
| 18 class NET_EXPORT_PRIVATE AeadBaseEncrypter : public QuicEncrypter { | |
| 19 public: | |
| 20 AeadBaseEncrypter(const EVP_AEAD* aead_alg, | |
| 21 size_t key_size, | |
| 22 size_t auth_tag_size, | |
| 23 size_t nonce_prefix_size); | |
| 24 ~AeadBaseEncrypter() override; | |
| 25 | |
| 26 // QuicEncrypter implementation | |
| 27 bool SetKey(base::StringPiece key) override; | |
| 28 bool SetNoncePrefix(base::StringPiece nonce_prefix) override; | |
| 29 bool EncryptPacket(QuicPathId path_id, | |
| 30 QuicPacketNumber packet_number, | |
| 31 base::StringPiece associated_data, | |
| 32 base::StringPiece plaintext, | |
| 33 char* output, | |
| 34 size_t* output_length, | |
| 35 size_t max_output_length) override; | |
| 36 size_t GetKeySize() const override; | |
| 37 size_t GetNoncePrefixSize() const override; | |
| 38 size_t GetMaxPlaintextSize(size_t ciphertext_size) const override; | |
| 39 size_t GetCiphertextSize(size_t plaintext_size) const override; | |
| 40 base::StringPiece GetKey() const override; | |
| 41 base::StringPiece GetNoncePrefix() const override; | |
| 42 | |
| 43 // Necessary so unit tests can explicitly specify a nonce, instead of a | |
| 44 // nonce prefix and packet number. | |
| 45 bool Encrypt(base::StringPiece nonce, | |
| 46 base::StringPiece associated_data, | |
| 47 base::StringPiece plaintext, | |
| 48 unsigned char* output); | |
| 49 | |
| 50 protected: | |
| 51 // Make these constants available to the subclasses so that the subclasses | |
| 52 // can assert at compile time their key_size_ and nonce_prefix_size_ do not | |
| 53 // exceed the maximum. | |
| 54 static const size_t kMaxKeySize = 32; | |
| 55 static const size_t kMaxNoncePrefixSize = 4; | |
| 56 | |
| 57 private: | |
| 58 const EVP_AEAD* const aead_alg_; | |
| 59 const size_t key_size_; | |
| 60 const size_t auth_tag_size_; | |
| 61 const size_t nonce_prefix_size_; | |
| 62 | |
| 63 // The key. | |
| 64 unsigned char key_[kMaxKeySize]; | |
| 65 // The nonce prefix. | |
| 66 unsigned char nonce_prefix_[kMaxNoncePrefixSize]; | |
| 67 | |
| 68 ScopedEVPAEADCtx ctx_; | |
| 69 | |
| 70 DISALLOW_COPY_AND_ASSIGN(AeadBaseEncrypter); | |
| 71 }; | |
| 72 | |
| 73 } // namespace net | |
| 74 | |
| 75 #endif // NET_QUIC_CRYPTO_AEAD_BASE_ENCRYPTER_H_ | |
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