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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <cstddef>
#include <memory>
#include "net/third_party/quiche/src/quic/core/crypto/quic_crypter.h"
#include "net/third_party/quiche/src/quic/core/quic_packets.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_string_piece.h"
namespace quic {
class QUIC_EXPORT_PRIVATE QuicEncrypter : public QuicCrypter {
virtual ~QuicEncrypter() {}
static std::unique_ptr<QuicEncrypter> Create(QuicTag algorithm);
// Creates an IETF QuicEncrypter based on |cipher_suite| which must be an id
// returned by SSL_CIPHER_get_id. The caller is responsible for taking
// ownership of the new QuicEncrypter.
static std::unique_ptr<QuicEncrypter> CreateFromCipherSuite(
uint32_t cipher_suite);
// Writes encrypted |plaintext| and a MAC over |plaintext| and
// |associated_data| into output. Sets |output_length| to the number of
// bytes written. Returns true on success or false if there was an error.
// |packet_number| is appended to the |nonce_prefix| value provided in
// SetNoncePrefix() to form the nonce. |output| must not overlap with
// |associated_data|. If |output| overlaps with |plaintext| then
// |plaintext| must be <= |output|.
virtual bool EncryptPacket(uint64_t packet_number,
QuicStringPiece associated_data,
QuicStringPiece plaintext,
char* output,
size_t* output_length,
size_t max_output_length) = 0;
// GetKeySize() and GetNoncePrefixSize() tell the HKDF class how many bytes
// of key material needs to be derived from the master secret.
// NOTE: the sizes returned by GetKeySize() and GetNoncePrefixSize() are
// also correct for the QuicDecrypter of the same algorithm.
// Returns the size in bytes of the fixed initial part of the nonce.
virtual size_t GetNoncePrefixSize() const = 0;
// Returns the maximum length of plaintext that can be encrypted
// to ciphertext no larger than |ciphertext_size|.
virtual size_t GetMaxPlaintextSize(size_t ciphertext_size) const = 0;
// Returns the length of the ciphertext that would be generated by encrypting
// to plaintext of size |plaintext_size|.
virtual size_t GetCiphertextSize(size_t plaintext_size) const = 0;
// For use by unit tests only.
virtual QuicStringPiece GetKey() const = 0;
virtual QuicStringPiece GetNoncePrefix() const = 0;
} // namespace quic