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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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