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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 // 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_
     70