net/quic/crypto/crypto_utils.h

   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 // Some helpers for quic crypto
   6
   7 #ifndef NET_QUIC_CRYPTO_CRYPTO_UTILS_H_
   8 #define NET_QUIC_CRYPTO_CRYPTO_UTILS_H_
   9
  10 #include <string>
  11
  12 #include "base/strings/string_piece.h"
  13 #include "net/base/net_export.h"
  14 #include "net/quic/crypto/crypto_handshake.h"
  15 #include "net/quic/crypto/crypto_protocol.h"
  16 #include "net/quic/quic_protocol.h"
  17 #include "net/quic/quic_time.h"
  18
  19 namespace net {
  20
  21 class QuicTime;
  22 class QuicRandom;
  23 struct QuicCryptoNegotiatedParameters;
  24
  25 class NET_EXPORT_PRIVATE CryptoUtils {
  26  public:
  27   enum Perspective {
  28     SERVER,
  29     CLIENT,
  30   };
  31
  32   // Generates the connection nonce. The nonce is formed as:
  33   //   <4 bytes> current time
  34   //   <8 bytes> |orbit| (or random if |orbit| is empty)
  35   //   <20 bytes> random
  36   static void GenerateNonce(QuicWallTime now,
  37                             QuicRandom* random_generator,
  38                             base::StringPiece orbit,
  39                             std::string* nonce);
  40
  41   // Returns true if the sni is valid, false otherwise.
  42   //  (1) disallow IP addresses;
  43   //  (2) check that the hostname contains valid characters only; and
  44   //  (3) contains at least one dot.
  45   static bool IsValidSNI(base::StringPiece sni);
  46
  47   // Convert hostname to lowercase and remove the trailing '.'.
  48   // Returns |hostname|. NormalizeHostname() doesn't support IP address
  49   // literals. IsValidSNI() should be called before calling NormalizeHostname().
  50   static std::string NormalizeHostname(const char* hostname);
  51
  52   // DeriveKeys populates |out->encrypter| and |out->decrypter| given the
  53   // contents of |premaster_secret|, |client_nonce|, |server_nonce| and
  54   // |hkdf_input|. |aead| determines which cipher will be used. |perspective|
  55   // controls whether the server's keys are assigned to |encrypter| or
  56   // |decrypter|. |server_nonce| is optional and, if non-empty, is mixed into
  57   // the key derivation.
  58   static bool DeriveKeys(base::StringPiece premaster_secret,
  59                          QuicTag aead,
  60                          base::StringPiece client_nonce,
  61                          base::StringPiece server_nonce,
  62                          const std::string& hkdf_input,
  63                          Perspective perspective,
  64                          CrypterPair* out);
  65 };
  66
  67 }  // namespace net
  68
  69 #endif  // NET_QUIC_CRYPTO_CRYPTO_UTILS_H_