dom/crypto/CryptoKey.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_dom_CryptoKey_h
   8 #define mozilla_dom_CryptoKey_h
   9
  10 #include <cstdint>
  11 #include "ErrorList.h"
  12 #include "ScopedNSSTypes.h"
  13 #include "js/RootingAPI.h"
  14 #include "keythi.h"
  15 #include "mozilla/AlreadyAddRefed.h"
  16 #include "mozilla/Assertions.h"
  17 #include "mozilla/RefPtr.h"
  18 #include "mozilla/dom/BindingDeclarations.h"
  19 #include "mozilla/dom/CryptoBuffer.h"
  20 #include "mozilla/dom/KeyAlgorithmProxy.h"
  21 #include "nsCycleCollectionParticipant.h"
  22 #include "nsIGlobalObject.h"
  23 #include "nsISupports.h"
  24 #include "nsStringFwd.h"
  25 #include "nsTArrayForwardDeclare.h"
  26 #include "nsWrapperCache.h"
  27
  28 #define CRYPTOKEY_SC_VERSION 0x00000001
  29
  30 class JSObject;
  31 class nsIGlobalObject;
  32 struct JSContext;
  33 struct JSStructuredCloneReader;
  34 struct JSStructuredCloneWriter;
  35
  36 namespace mozilla {
  37
  38 class ErrorResult;
  39
  40 namespace dom {
  41
  42 /*
  43
  44 The internal structure of keys is dictated by the need for cloning.
  45 We store everything besides the key data itself in a 32-bit bitmask,
  46 with the following structure (byte-aligned for simplicity, in order
  47 from least to most significant):
  48
  49 Bits  Usage
  50 0     Extractable
  51 1-7   [reserved]
  52 8-15  KeyType
  53 16-23 KeyUsage
  54 24-31 [reserved]
  55
  56 In the order of a hex value for a uint32_t
  57
  58    3                   2                   1                   0
  59  1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
  60 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  61 |~~~~~~~~~~~~~~~|     Usage     |     Type      |~~~~~~~~~~~~~|E|
  62 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  63
  64 Thus, internally, a key has the following fields:
  65 * uint32_t - flags for extractable, usage, type
  66 * KeyAlgorithm - the algorithm (which must serialize/deserialize itself)
  67 * The actual keys (which the CryptoKey must serialize)
  68
  69 */
  70
  71 struct JsonWebKey;
  72
  73 class CryptoKey final : public nsISupports, public nsWrapperCache {
  74  public:
  75   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  76   NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(CryptoKey)
  77
  78   static const uint32_t CLEAR_EXTRACTABLE = 0xFFFFFFE;
  79   static const uint32_t EXTRACTABLE = 0x00000001;
  80
  81   static const uint32_t CLEAR_TYPE = 0xFFFF00FF;
  82   static const uint32_t TYPE_MASK = 0x0000FF00;
  83   enum KeyType {
  84     UNKNOWN = 0x00000000,
  85     SECRET = 0x00000100,
  86     PUBLIC = 0x00000200,
  87     PRIVATE = 0x00000300
  88   };
  89
  90   static const uint32_t CLEAR_USAGES = 0xFF00FFFF;
  91   static const uint32_t USAGES_MASK = 0x00FF0000;
  92   enum KeyUsage {
  93     ENCRYPT = 0x00010000,
  94     DECRYPT = 0x00020000,
  95     SIGN = 0x00040000,
  96     VERIFY = 0x00080000,
  97     DERIVEKEY = 0x00100000,
  98     DERIVEBITS = 0x00200000,
  99     WRAPKEY = 0x00400000,
 100     UNWRAPKEY = 0x00800000
 101   };
 102
 103   explicit CryptoKey(nsIGlobalObject* aWindow);
 104
 105   nsIGlobalObject* GetParentObject() const { return mGlobal; }
 106
 107   virtual JSObject* WrapObject(JSContext* aCx,
 108                                JS::Handle<JSObject*> aGivenProto) override;
 109
 110   // WebIDL methods
 111   void GetType(nsString& aRetVal) const;
 112   bool Extractable() const;
 113   void GetAlgorithm(JSContext* cx, JS::MutableHandle<JSObject*> aRetVal,
 114                     ErrorResult& aRv) const;
 115   void GetUsages(nsTArray<nsString>& aRetVal) const;
 116
 117   // The below methods are not exposed to JS, but C++ can use
 118   // them to manipulate the object
 119
 120   KeyAlgorithmProxy& Algorithm();
 121   const KeyAlgorithmProxy& Algorithm() const;
 122   KeyType GetKeyType() const;
 123   nsresult SetType(const nsString& aType);
 124   void SetType(KeyType aType);
 125   void SetExtractable(bool aExtractable);
 126   nsresult AddPublicKeyData(SECKEYPublicKey* point);
 127   void ClearUsages();
 128   nsresult AddUsage(const nsString& aUsage);
 129   nsresult AddAllowedUsage(const nsString& aUsage, const nsString& aAlgorithm);
 130   nsresult AddAllowedUsageIntersecting(const nsString& aUsage,
 131                                        const nsString& aAlgorithm,
 132                                        uint32_t aUsageMask = USAGES_MASK);
 133   void AddUsage(KeyUsage aUsage);
 134   bool HasAnyUsage();
 135   bool HasUsage(KeyUsage aUsage);
 136   bool HasUsageOtherThan(uint32_t aUsages);
 137   static bool IsRecognizedUsage(const nsString& aUsage);
 138   static bool AllUsagesRecognized(const Sequence<nsString>& aUsages);
 139   static uint32_t GetAllowedUsagesForAlgorithm(const nsString& aAlgorithm);
 140
 141   nsresult SetSymKey(const CryptoBuffer& aSymKey);
 142   nsresult SetPrivateKey(SECKEYPrivateKey* aPrivateKey);
 143   nsresult SetPublicKey(SECKEYPublicKey* aPublicKey);
 144
 145   // Accessors for the keys themselves
 146   const CryptoBuffer& GetSymKey() const;
 147   UniqueSECKEYPrivateKey GetPrivateKey() const;
 148   UniqueSECKEYPublicKey GetPublicKey() const;
 149
 150   // Serialization and deserialization convenience methods
 151   // Note:
 152   // 1. The inputs aKeyData are non-const only because the NSS import
 153   //    functions lack the const modifier.  They should not be modified.
 154   // 2. All of the NSS key objects returned need to be freed by the caller.
 155   static UniqueSECKEYPrivateKey PrivateKeyFromPkcs8(CryptoBuffer& aKeyData);
 156   static nsresult PrivateKeyToPkcs8(SECKEYPrivateKey* aPrivKey,
 157                                     CryptoBuffer& aRetVal);
 158
 159   static UniqueSECKEYPublicKey PublicKeyFromSpki(CryptoBuffer& aKeyData);
 160   static nsresult PublicKeyToSpki(SECKEYPublicKey* aPubKey,
 161                                   CryptoBuffer& aRetVal);
 162
 163   static UniqueSECKEYPrivateKey PrivateKeyFromJwk(const JsonWebKey& aJwk);
 164   static nsresult PrivateKeyToJwk(SECKEYPrivateKey* aPrivKey,
 165                                   JsonWebKey& aRetVal);
 166
 167   static UniqueSECKEYPublicKey PublicKeyFromJwk(const JsonWebKey& aKeyData);
 168   static nsresult PublicKeyToJwk(SECKEYPublicKey* aPubKey, JsonWebKey& aRetVal);
 169
 170   static UniqueSECKEYPublicKey PublicECKeyFromRaw(CryptoBuffer& aKeyData,
 171                                                   const nsString& aNamedCurve);
 172   static nsresult PublicECKeyToRaw(SECKEYPublicKey* aPubKey,
 173                                    CryptoBuffer& aRetVal);
 174
 175   static bool PublicKeyValid(SECKEYPublicKey* aPubKey);
 176
 177   // Structured clone methods use these to clone keys
 178   bool WriteStructuredClone(JSContext* aCx,
 179                             JSStructuredCloneWriter* aWriter) const;
 180   static already_AddRefed<CryptoKey> ReadStructuredClone(
 181       JSContext* aCx, nsIGlobalObject* aGlobal,
 182       JSStructuredCloneReader* aReader);
 183
 184  private:
 185   ~CryptoKey() = default;
 186
 187   RefPtr<nsIGlobalObject> mGlobal;
 188   uint32_t mAttributes;  // see above
 189   KeyAlgorithmProxy mAlgorithm;
 190
 191   // Only one key handle should be set, according to the KeyType
 192   CryptoBuffer mSymKey;
 193   UniqueSECKEYPrivateKey mPrivateKey;
 194   UniqueSECKEYPublicKey mPublicKey;
 195 };
 196
 197 }  // namespace dom
 198 }  // namespace mozilla
 199
 200 #endif  // mozilla_dom_CryptoKey_h