1 // Copyright 2014 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.
5 #ifndef NET_QUIC_CRYPTO_CHACHA20_POLY1305_DECRYPTER_H_
6 #define NET_QUIC_CRYPTO_CHACHA20_POLY1305_DECRYPTER_H_
8 #include "net/quic/crypto/aead_base_decrypter.h"
12 // A ChaCha20Poly1305Decrypter is a QuicDecrypter that implements the
13 // AEAD_CHACHA20_POLY1305 algorithm specified in
14 // draft-agl-tls-chacha20poly1305-04, except that it truncates the Poly1305
15 // authenticator to 12 bytes. Create an instance by calling
16 // QuicDecrypter::Create(kCC12).
18 // It uses an authentication tag of 16 bytes (128 bits). There is no
19 // fixed nonce prefix.
20 class NET_EXPORT_PRIVATE ChaCha20Poly1305Decrypter
: public AeadBaseDecrypter
{
26 ChaCha20Poly1305Decrypter();
27 ~ChaCha20Poly1305Decrypter() override
;
29 // Returns true if the underlying crypto library supports ChaCha20+Poly1305.
30 static bool IsSupported();
32 #if !defined(USE_OPENSSL)
34 // AeadBaseDecrypter methods:
35 void FillAeadParams(base::StringPiece nonce
,
36 const base::StringPiece
& associated_data
,
38 AeadParams
* aead_params
) const override
;
41 const char* cipher_name() const override
;
42 uint32
cipher_id() const override
;
45 DISALLOW_COPY_AND_ASSIGN(ChaCha20Poly1305Decrypter
);
50 #endif // NET_QUIC_CRYPTO_CHACHA20_POLY1305_DECRYPTER_H_