| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef DRM_API_H_ |
| #define DRM_API_H_ |
| |
| #include <utils/List.h> |
| #include <utils/String8.h> |
| #include <utils/Vector.h> |
| #include <utils/KeyedVector.h> |
| #include <utils/RefBase.h> |
| #include <media/stagefright/foundation/ABase.h> |
| |
| // Loadable DrmEngine shared libraries should define the entry points |
| // createDrmFactory and createCryptoFactory as shown below: |
| // |
| // extern "C" { |
| // extern android::DrmFactory *createDrmFactory(); |
| // extern android::CryptoFactory *createCryptoFactory(); |
| // } |
| |
| namespace android { |
| |
| struct DrmPlugin; |
| |
| // DRMs are implemented in DrmEngine plugins, which are dynamically |
| // loadable shared libraries that implement the entry points |
| // createDrmFactory and createCryptoFactory. createDrmFactory |
| // constructs and returns an instance of a DrmFactory object. Similarly, |
| // createCryptoFactory creates an instance of a CryptoFactory object. |
| // When a MediaCrypto or MediaDrm object needs to be constructed, all |
| // available DrmEngines present in the plugins directory on the device |
| // are scanned for a matching DrmEngine that can support the crypto |
| // scheme. When a match is found, the DrmEngine's createCryptoPlugin and |
| // createDrmPlugin methods are used to create CryptoPlugin or |
| // DrmPlugin instances to support that DRM scheme. |
| |
| class DrmFactory { |
| public: |
| DrmFactory() {} |
| virtual ~DrmFactory() {} |
| |
| // DrmFactory::isCryptoSchemeSupported can be called to determine |
| // if the plugin factory is able to construct plugins that support a |
| // given crypto scheme, which is specified by a UUID. |
| virtual bool isCryptoSchemeSupported(const uint8_t uuid[16]) = 0; |
| |
| // Construct a DrmPlugin for the crypto scheme specified by UUID. |
| virtual status_t createDrmPlugin( |
| const uint8_t uuid[16], DrmPlugin **plugin) = 0; |
| |
| private: |
| DrmFactory(const DrmFactory &); |
| DrmFactory &operator=(const DrmFactory &); |
| }; |
| |
| class DrmPlugin { |
| public: |
| enum EventType { |
| kDrmPluginEventProvisionRequired, |
| kDrmPluginEventKeyNeeded, |
| kDrmPluginEventKeyExpired, |
| kDrmPluginEventVendorDefined |
| }; |
| |
| // Drm keys can be for offline content or for online streaming. |
| // Offline keys are persisted on the device and may be used when the device |
| // is disconnected from the network. |
| enum KeyType { |
| kKeyType_Offline, |
| kKeyType_Streaming |
| }; |
| |
| DrmPlugin() {} |
| virtual ~DrmPlugin() {} |
| |
| // Open a new session with the DrmPlugin object. A session ID is returned |
| // in the sessionId parameter. |
| virtual status_t openSession(Vector<uint8_t> &sessionId) = 0; |
| |
| // Close a session on the DrmPlugin object. |
| virtual status_t closeSession(Vector<uint8_t> const &sessionId) = 0; |
| |
| // A key request/response exchange occurs between the app and a License |
| // Server to obtain the keys required to decrypt the content. getKeyRequest() |
| // is used to obtain an opaque key request blob that is delivered to the |
| // license server. |
| // |
| // The init data passed to getKeyRequest is container-specific and its |
| // meaning is interpreted based on the mime type provided in the mimeType |
| // parameter to getKeyRequest. It could contain, for example, the content |
| // ID, key ID or other data obtained from the content metadata that is required |
| // in generating the key request. |
| // |
| // keyType specifes if the keys are to be used for streaming or offline content |
| // |
| // optionalParameters are included in the key request message to allow a |
| // client application to provide additional message parameters to the server. |
| // |
| // If successful, the opaque key request blob is returned to the caller. |
| virtual status_t |
| getKeyRequest(Vector<uint8_t> const &sessionId, |
| Vector<uint8_t> const &initData, |
| String8 const &mimeType, KeyType keyType, |
| KeyedVector<String8, String8> const &optionalParameters, |
| Vector<uint8_t> &request, String8 &defaultUrl) = 0; |
| |
| // After a key response is received by the app, it is provided to the |
| // Drm plugin using provideKeyResponse. Returns the id of the key set |
| // in keySetId. The keySetId can be used by removeKeys or restoreKeys |
| // when the keys are used for offline content. |
| virtual status_t provideKeyResponse(Vector<uint8_t> const &sessionId, |
| Vector<uint8_t> const &response, |
| Vector<uint8_t> &keySetId) = 0; |
| |
| // Remove the persisted keys associated with an offline license for a session. |
| virtual status_t removeKeys(Vector<uint8_t> const &keySetId) = 0; |
| |
| // Restore persisted offline keys into a new session. keySetId identifies |
| // the keys to load, obtained from a prior call to provideKeyResponse(). |
| virtual status_t restoreKeys(Vector<uint8_t> const &sessionId, |
| Vector<uint8_t> const &keySetId) = 0; |
| |
| // Request an informative description of the license for the session. The status |
| // is in the form of {name, value} pairs. Since DRM license policies vary by |
| // vendor, the specific status field names are determined by each DRM vendor. |
| // Refer to your DRM provider documentation for definitions of the field names |
| // for a particular DrmEngine. |
| virtual status_t |
| queryKeyStatus(Vector<uint8_t> const &sessionId, |
| KeyedVector<String8, String8> &infoMap) const = 0; |
| |
| // A provision request/response exchange occurs between the app and a |
| // provisioning server to retrieve a device certificate. getProvisionRequest |
| // is used to obtain an opaque key request blob that is delivered to the |
| // provisioning server. |
| // |
| // If successful, the opaque provision request blob is returned to the caller. |
| virtual status_t getProvisionRequest(Vector<uint8_t> &request, |
| String8 &defaultUrl) = 0; |
| |
| // After a provision response is received by the app, it is provided to the |
| // Drm plugin using provideProvisionResponse. |
| virtual status_t provideProvisionResponse(Vector<uint8_t> const &response) = 0; |
| |
| // A means of enforcing the contractual requirement for a concurrent stream |
| // limit per subscriber across devices is provided via SecureStop. SecureStop |
| // is a means of securely monitoring the lifetime of sessions. Since playback |
| // on a device can be interrupted due to reboot, power failure, etc. a means |
| // of persisting the lifetime information on the device is needed. |
| // |
| // A signed version of the sessionID is written to persistent storage on the |
| // device when each MediaCrypto object is created. The sessionID is signed by |
| // the device private key to prevent tampering. |
| // |
| // In the normal case, playback will be completed, the session destroyed and |
| // the Secure Stops will be queried. The App queries secure stops and forwards |
| // the secure stop message to the server which verifies the signature and |
| // notifies the server side database that the session destruction has been |
| // confirmed. The persisted record on the client is only removed after positive |
| // confirmation that the server received the message using releaseSecureStops(). |
| virtual status_t getSecureStops(List<Vector<uint8_t> > &secureStops) = 0; |
| virtual status_t releaseSecureStops(Vector<uint8_t> const &ssRelease) = 0; |
| |
| // Read a property value given the device property string. There are a few forms |
| // of property access methods, depending on the data type returned. |
| // Since DRM plugin properties may vary, additional field names may be defined |
| // by each DRM vendor. Refer to your DRM provider documentation for definitions |
| // of its additional field names. |
| // |
| // Standard values are: |
| // "vendor" [string] identifies the maker of the plugin |
| // "version" [string] identifies the version of the plugin |
| // "description" [string] describes the plugin |
| // 'deviceUniqueId' [byte array] The device unique identifier is established |
| // during device provisioning and provides a means of uniquely identifying |
| // each device. |
| virtual status_t getPropertyString(String8 const &name, String8 &value ) const = 0; |
| virtual status_t getPropertyByteArray(String8 const &name, |
| Vector<uint8_t> &value ) const = 0; |
| |
| // Write a property value given the device property string. There are a few forms |
| // of property setting methods, depending on the data type. |
| // Since DRM plugin properties may vary, additional field names may be defined |
| // by each DRM vendor. Refer to your DRM provider documentation for definitions |
| // of its field names. |
| virtual status_t setPropertyString(String8 const &name, |
| String8 const &value ) = 0; |
| virtual status_t setPropertyByteArray(String8 const &name, |
| Vector<uint8_t> const &value ) = 0; |
| |
| // The following methods implement operations on a CryptoSession to support |
| // encrypt, decrypt, sign verify operations on operator-provided |
| // session keys. |
| |
| // |
| // The algorithm string conforms to JCA Standard Names for Cipher |
| // Transforms and is case insensitive. For example "AES/CBC/PKCS5Padding". |
| // |
| // Return OK if the algorithm is supported, otherwise return BAD_VALUE |
| // |
| virtual status_t setCipherAlgorithm(Vector<uint8_t> const &sessionId, |
| String8 const &algorithm) = 0; |
| |
| // |
| // The algorithm string conforms to JCA Standard Names for Mac |
| // Algorithms and is case insensitive. For example "HmacSHA256". |
| // |
| // Return OK if the algorithm is supported, otherwise return BAD_VALUE |
| // |
| virtual status_t setMacAlgorithm(Vector<uint8_t> const &sessionId, |
| String8 const &algorithm) = 0; |
| |
| // Encrypt the provided input buffer with the cipher algorithm |
| // specified by setCipherAlgorithm and the key selected by keyId, |
| // and return the encrypted data. |
| virtual status_t encrypt(Vector<uint8_t> const &sessionId, |
| Vector<uint8_t> const &keyId, |
| Vector<uint8_t> const &input, |
| Vector<uint8_t> const &iv, |
| Vector<uint8_t> &output) = 0; |
| |
| // Decrypt the provided input buffer with the cipher algorithm |
| // specified by setCipherAlgorithm and the key selected by keyId, |
| // and return the decrypted data. |
| virtual status_t decrypt(Vector<uint8_t> const &sessionId, |
| Vector<uint8_t> const &keyId, |
| Vector<uint8_t> const &input, |
| Vector<uint8_t> const &iv, |
| Vector<uint8_t> &output) = 0; |
| |
| // Compute a signature on the provided message using the mac algorithm |
| // specified by setMacAlgorithm and the key selected by keyId, |
| // and return the signature. |
| virtual status_t sign(Vector<uint8_t> const &sessionId, |
| Vector<uint8_t> const &keyId, |
| Vector<uint8_t> const &message, |
| Vector<uint8_t> &signature) = 0; |
| |
| // Compute a signature on the provided message using the mac algorithm |
| // specified by setMacAlgorithm and the key selected by keyId, |
| // and compare with the expected result. Set result to true or |
| // false depending on the outcome. |
| virtual status_t verify(Vector<uint8_t> const &sessionId, |
| Vector<uint8_t> const &keyId, |
| Vector<uint8_t> const &message, |
| Vector<uint8_t> const &signature, |
| bool &match) = 0; |
| |
| |
| |
| // TODO: provide way to send an event |
| private: |
| DISALLOW_EVIL_CONSTRUCTORS(DrmPlugin); |
| }; |
| |
| } // namespace android |
| |
| #endif // DRM_API_H_ |
