Add Device info validator to oemcrypto util and unit tests

Validator that can parse and validate device info Cbor object.
This is to support better prov40 unit tests regarding
OEMCrypto_GetDeviceInformation() later.

Test: opk_ta_p40
Bug: 300304834
Change-Id: Ic260a6626dffcbef5d6b386263839499f83a69db

libwvdrmengine/oemcrypto/util/include/device_info_validator.h

@@ -0,0 +1,54 @@
+// Copyright 2023 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine License
+// Agreement.
+//
+//  Reference implementation utilities of OEMCrypto APIs
+//
+#ifndef WVOEC_UTIL_DEVICE_INFO_VALIDATOR_H_
+#define WVOEC_UTIL_DEVICE_INFO_VALIDATOR_H_
+
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include "cbor_validator.h"
+#include "cppbor.h"
+
+namespace wvoec {
+namespace util {
+// DeviceInfoValidator parses and validates a Cbor struct of DeviceInfo used by
+// Provisioning 4.0. DeviceInfo definition:
+// https://source.corp.google.com/h/googleplex-android/platform/superproject/main/+/main:hardware/interfaces/security/rkp/aidl/android/hardware/security/keymint/DeviceInfoV3.cddl
+class DeviceInfoValidator : public CborValidator {
+ public:
+  explicit DeviceInfoValidator(int version_number)
+      : version_number_(version_number) {}
+  DeviceInfoValidator() = delete;
+  virtual ~DeviceInfoValidator() override = default;
+  DeviceInfoValidator(const DeviceInfoValidator&) = delete;
+  DeviceInfoValidator& operator=(const DeviceInfoValidator&) = delete;
+
+  // Decodes |device_info| and sets |message_status_|.
+  virtual CborMessageStatus Parse(
+      const std::vector<uint8_t>& device_info) override;
+  // Verifies the Cbor struct of a client generated device info.
+  virtual CborMessageStatus Validate() override;
+  // Outputs DeviceInfo in YAML.
+  virtual std::string GetFormattedMessage() const override;
+
+ private:
+  // Checks whether a device info entry with |entry_name| and |major_type|
+  // exists in |device_info| map.
+  void CheckDeviceInfoMapEntry(const cppbor::Map& device_info,
+                               cppbor::MajorType major_type,
+                               const std::string& entry_name);
+  // Used to generate formatted message.
+  std::stringstream msg_ss_;
+  // Device info version. Validations are done based on the version number.
+  int version_number_;
+  // Saved Cbor-encoded device info.
+  std::vector<uint8_t> device_info_bytes_;
+};
+}  // namespace util
+}  // namespace wvoec
+#endif  // WVOEC_UTIL_DEVICE_INFO_VALIDATOR_H_