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Side by Side Diff: net/quic/crypto/quic_decrypter.h

Issue 992733002: Remove //net (except for Android test stuff) and sdch (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 9 months ago
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1 // Copyright (c) 2012 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_QUIC_DECRYPTER_H_
6 #define NET_QUIC_CRYPTO_QUIC_DECRYPTER_H_
7
8 #include "net/base/net_export.h"
9 #include "net/quic/quic_protocol.h"
10
11 namespace net {
12
13 class NET_EXPORT_PRIVATE QuicDecrypter {
14 public:
15 virtual ~QuicDecrypter() {}
16
17 static QuicDecrypter* Create(QuicTag algorithm);
18
19 // Sets the encryption key. Returns true on success, false on failure.
20 //
21 // NOTE: The key is the client_write_key or server_write_key derived from
22 // the master secret.
23 virtual bool SetKey(base::StringPiece key) = 0;
24
25 // Sets the fixed initial bytes of the nonce. Returns true on success,
26 // false on failure.
27 //
28 // NOTE: The nonce prefix is the client_write_iv or server_write_iv
29 // derived from the master secret. A 64-bit packet sequence number will
30 // be appended to form the nonce.
31 //
32 // <------------ 64 bits ----------->
33 // +---------------------+----------------------------------+
34 // | Fixed prefix | Packet sequence number |
35 // +---------------------+----------------------------------+
36 // Nonce format
37 //
38 // The security of the nonce format requires that QUIC never reuse a
39 // packet sequence number, even when retransmitting a lost packet.
40 virtual bool SetNoncePrefix(base::StringPiece nonce_prefix) = 0;
41
42 // Populates |output| with the decrypted |ciphertext| and populates
43 // |output_length| with the length. Returns 0 if there is an error.
44 // |output| size is specified by |max_output_length| and must be
45 // at least as large as the ciphertext. |sequence_number| is
46 // appended to the |nonce_prefix| value provided in SetNoncePrefix()
47 // to form the nonce.
48 // TODO(wtc): add a way for DecryptPacket to report decryption failure due
49 // to non-authentic inputs, as opposed to other reasons for failure.
50 virtual bool DecryptPacket(QuicPacketSequenceNumber sequence_number,
51 const base::StringPiece& associated_data,
52 const base::StringPiece& ciphertext,
53 char* output,
54 size_t* output_length,
55 size_t max_output_length) = 0;
56
57 // For use by unit tests only.
58 virtual base::StringPiece GetKey() const = 0;
59 virtual base::StringPiece GetNoncePrefix() const = 0;
60 };
61
62 } // namespace net
63
64 #endif // NET_QUIC_CRYPTO_QUIC_DECRYPTER_H_
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