V18.4.0 CAS plugin

Note that this version does not have Widevine Provisioning 4.0 support.
It is only suitable for device upgrades. A new patch with provisioning
4.0 support will be made later.

plugin/include/ecm_parser_v3.h

@@ -0,0 +1,68 @@
+// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine Master
+// License Agreement.
+
+#ifndef ECM_PARSER_V3_H
+#define ECM_PARSER_V3_H
+
+#include <memory>
+#include <vector>
+
+#include "cas_types.h"
+#include "ecm_parser.h"
+#include "media_cas.pb.h"
+
+namespace wvcas {
+
+// EcmParser allows random access to the fields of an ECM.
+class EcmParserV3 : public EcmParser {
+ public:
+  ~EcmParserV3() override = default;
+  EcmParserV3(const EcmParserV3&) = delete;
+  EcmParserV3& operator=(const EcmParserV3&) = delete;
+
+  // The EcmParserV3 factory method.
+  // |ecm| must be Widevine ECM v3 (or higher if compatible) without section
+  // header. Validates the ecm. If validations is successful returns an
+  // EcmParserV3, otherwise an nullptr.
+  static std::unique_ptr<EcmParserV3> Create(const CasEcm& ecm);
+
+  // Accessor methods.
+  uint8_t version() const override;
+  CryptoMode crypto_mode() const override;
+  bool rotation_enabled() const override;
+  size_t content_iv_size() const override;
+  uint8_t age_restriction() const override;
+  std::vector<uint8_t> entitlement_key_id(KeySlotId id) const override;
+  std::vector<uint8_t> content_key_id(KeySlotId id) const override;
+  std::vector<uint8_t> wrapped_key_data(KeySlotId id) const override;
+  std::vector<uint8_t> wrapped_key_iv(KeySlotId id) const override;
+  std::vector<uint8_t> content_iv(KeySlotId id) const override;
+
+  bool set_group_id(const std::string& group_id) override;
+
+  bool has_fingerprinting() const override;
+  video_widevine::Fingerprinting fingerprinting() const override;
+  bool has_service_blocking() const override;
+  video_widevine::ServiceBlocking service_blocking() const override;
+  // The serialized payload that the signature is calculated on.
+  std::string ecm_serialized_payload() const override;
+  std::string signature() const override;
+
+  bool is_entitlement_rotation_enabled() const override;
+  uint32_t entitlement_period_index() const override;
+  uint32_t entitlement_rotation_window_left() const override;
+
+ private:
+  // Constructs an EcmParserV3 using |ecm|.
+  EcmParserV3(video_widevine::SignedEcmPayload signed_ecm_payload,
+              video_widevine::EcmPayload ecm_payload);
+  video_widevine::SignedEcmPayload signed_ecm_payload_;
+  video_widevine::EcmPayload ecm_payload_;
+  video_widevine::EcmKeyData even_key_data_;
+  video_widevine::EcmKeyData odd_key_data_;
+};
+
+}  // namespace wvcas
+
+#endif  // ECM_PARSER_V3_H