// 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.
//
//  Reference implementation of OEMCrypto APIs
//
#include "oemcrypto_auth_ref.h"

#include <string.h>

#include <string>
#include <vector>

#include "keys.h"
#include "log.h"

namespace wvoec_ref {
namespace {

// Fake device ID which is to be returned inplace of a real ID.
const std::string kFakeDeviceId = "device_with_no_keybox";

// A 2048 bit RSA key in PKCS#8 PrivateKeyInfo format
// This is the RSA Test Key. This key is not derived
// from any Widevine authentication root.
static const uint8_t kTestRSAPKCS8PrivateKeyInfo2_2048[] = {
  0x30, 0x82, 0x04, 0xbc, 0x02, 0x01, 0x00, 0x30,
  0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7,
  0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x04, 0x82,
  0x04, 0xa6, 0x30, 0x82, 0x04, 0xa2, 0x02, 0x01,
  0x00, 0x02, 0x82, 0x01, 0x01, 0x00, 0xa7, 0x00,
  0x36, 0x60, 0x65, 0xdc, 0xbd, 0x54, 0x5a, 0x2a,
  0x40, 0xb4, 0xe1, 0x15, 0x94, 0x58, 0x11, 0x4f,
  0x94, 0x58, 0xdd, 0xde, 0xa7, 0x1f, 0x3c, 0x2c,
  0xe0, 0x88, 0x09, 0x29, 0x61, 0x57, 0x67, 0x5e,
  0x56, 0x7e, 0xee, 0x27, 0x8f, 0x59, 0x34, 0x9a,
  0x2a, 0xaa, 0x9d, 0xb4, 0x4e, 0xfa, 0xa7, 0x6a,
  0xd4, 0xc9, 0x7a, 0x53, 0xc1, 0x4e, 0x9f, 0xe3,
  0x34, 0xf7, 0x3d, 0xb7, 0xc9, 0x10, 0x47, 0x4f,
  0x28, 0xda, 0x3f, 0xce, 0x31, 0x7b, 0xfd, 0x06,
  0x10, 0xeb, 0xf7, 0xbe, 0x92, 0xf9, 0xaf, 0xfb,
  0x3e, 0x68, 0xda, 0xee, 0x1a, 0x64, 0x4c, 0xf3,
  0x29, 0xf2, 0x73, 0x9e, 0x39, 0xd8, 0xf6, 0x6f,
  0xd8, 0xb2, 0x80, 0x82, 0x71, 0x8e, 0xb5, 0xa4,
  0xf2, 0xc2, 0x3e, 0xcd, 0x0a, 0xca, 0xb6, 0x04,
  0xcd, 0x9a, 0x13, 0x8b, 0x54, 0x73, 0x54, 0x25,
  0x54, 0x8c, 0xbe, 0x98, 0x7a, 0x67, 0xad, 0xda,
  0xb3, 0x4e, 0xb3, 0xfa, 0x82, 0xa8, 0x4a, 0x67,
  0x98, 0x56, 0x57, 0x54, 0x71, 0xcd, 0x12, 0x7f,
  0xed, 0xa3, 0x01, 0xc0, 0x6a, 0x8b, 0x24, 0x03,
  0x96, 0x88, 0xbe, 0x97, 0x66, 0x2a, 0xbc, 0x53,
  0xc9, 0x83, 0x06, 0x51, 0x5a, 0x88, 0x65, 0x13,
  0x18, 0xe4, 0x3a, 0xed, 0x6b, 0xf1, 0x61, 0x5b,
  0x4c, 0xc8, 0x1e, 0xf4, 0xc2, 0xae, 0x08, 0x5e,
  0x2d, 0x5f, 0xf8, 0x12, 0x7f, 0xa2, 0xfc, 0xbb,
  0x21, 0x18, 0x30, 0xda, 0xfe, 0x40, 0xfb, 0x01,
  0xca, 0x2e, 0x37, 0x0e, 0xce, 0xdd, 0x76, 0x87,
  0x82, 0x46, 0x0b, 0x3a, 0x77, 0x8f, 0xc0, 0x72,
  0x07, 0x2c, 0x7f, 0x9d, 0x1e, 0x86, 0x5b, 0xed,
  0x27, 0x29, 0xdf, 0x03, 0x97, 0x62, 0xef, 0x44,
  0xd3, 0x5b, 0x3d, 0xdb, 0x9c, 0x5e, 0x1b, 0x7b,
  0x39, 0xb4, 0x0b, 0x6d, 0x04, 0x6b, 0xbb, 0xbb,
  0x2c, 0x5f, 0xcf, 0xb3, 0x7a, 0x05, 0x02, 0x03,
  0x01, 0x00, 0x01, 0x02, 0x82, 0x01, 0x00, 0x5e,
  0x79, 0x65, 0x49, 0xa5, 0x76, 0x79, 0xf9, 0x05,
  0x45, 0x0f, 0xf4, 0x03, 0xbd, 0xa4, 0x7d, 0x29,
  0xd5, 0xde, 0x33, 0x63, 0xd8, 0xb8, 0xac, 0x97,
  0xeb, 0x3f, 0x5e, 0x55, 0xe8, 0x7d, 0xf3, 0xe7,
  0x3b, 0x5c, 0x2d, 0x54, 0x67, 0x36, 0xd6, 0x1d,
  0x46, 0xf5, 0xca, 0x2d, 0x8b, 0x3a, 0x7e, 0xdc,
  0x45, 0x38, 0x79, 0x7e, 0x65, 0x71, 0x5f, 0x1c,
  0x5e, 0x79, 0xb1, 0x40, 0xcd, 0xfe, 0xc5, 0xe1,
  0xc1, 0x6b, 0x78, 0x04, 0x4e, 0x8e, 0x79, 0xf9,
  0x0a, 0xfc, 0x79, 0xb1, 0x5e, 0xb3, 0x60, 0xe3,
  0x68, 0x7b, 0xc6, 0xef, 0xcb, 0x71, 0x4c, 0xba,
  0xa7, 0x79, 0x5c, 0x7a, 0x81, 0xd1, 0x71, 0xe7,
  0x00, 0x21, 0x13, 0xe2, 0x55, 0x69, 0x0e, 0x75,
  0xbe, 0x09, 0xc3, 0x4f, 0xa9, 0xc9, 0x68, 0x22,
  0x0e, 0x97, 0x8d, 0x89, 0x6e, 0xf1, 0xe8, 0x88,
  0x7a, 0xd1, 0xd9, 0x09, 0x5d, 0xd3, 0x28, 0x78,
  0x25, 0x0b, 0x1c, 0x47, 0x73, 0x25, 0xcc, 0x21,
  0xb6, 0xda, 0xc6, 0x24, 0x5a, 0xd0, 0x37, 0x14,
  0x46, 0xc7, 0x94, 0x69, 0xe4, 0x43, 0x6f, 0x47,
  0xde, 0x00, 0x33, 0x4d, 0x8f, 0x95, 0x72, 0xfa,
  0x68, 0x71, 0x17, 0x66, 0x12, 0x1a, 0x87, 0x27,
  0xf7, 0xef, 0x7e, 0xe0, 0x35, 0x58, 0xf2, 0x4d,
  0x6f, 0x35, 0x01, 0xaa, 0x96, 0xe2, 0x3d, 0x51,
  0x13, 0x86, 0x9c, 0x79, 0xd0, 0xb7, 0xb6, 0x64,
  0xe8, 0x86, 0x65, 0x50, 0xbf, 0xcc, 0x27, 0x53,
  0x1f, 0x51, 0xd4, 0xca, 0xbe, 0xf5, 0xdd, 0x77,
  0x70, 0x98, 0x0f, 0xee, 0xa8, 0x96, 0x07, 0x5f,
  0x45, 0x6a, 0x7a, 0x0d, 0x03, 0x9c, 0x4f, 0x29,
  0xf6, 0x06, 0xf3, 0x5d, 0x58, 0x6c, 0x47, 0xd0,
  0x96, 0xa9, 0x03, 0x17, 0xbb, 0x4e, 0xc9, 0x21,
  0xe0, 0xac, 0xcd, 0x78, 0x78, 0xb2, 0xfe, 0x81,
  0xb2, 0x51, 0x53, 0xa6, 0x1f, 0x98, 0x45, 0x02,
  0x81, 0x81, 0x00, 0xcf, 0x73, 0x8c, 0xbe, 0x6d,
  0x45, 0x2d, 0x0c, 0x0b, 0x5d, 0x5c, 0x6c, 0x75,
  0x78, 0xcc, 0x35, 0x48, 0xb6, 0x98, 0xf1, 0xb9,
  0x64, 0x60, 0x8c, 0x43, 0xeb, 0x85, 0xab, 0x04,
  0xb6, 0x7d, 0x1b, 0x71, 0x75, 0x06, 0xe2, 0xda,
  0x84, 0x68, 0x2e, 0x7f, 0x4c, 0xe3, 0x73, 0xb4,
  0xde, 0x51, 0x4b, 0xb6, 0x51, 0x86, 0x7b, 0xd0,
  0xe6, 0x4d, 0xf3, 0xd1, 0xcf, 0x1a, 0xfe, 0x7f,
  0x3a, 0x83, 0xba, 0xb3, 0xe1, 0xff, 0x54, 0x13,
  0x93, 0xd7, 0x9c, 0x27, 0x80, 0xb7, 0x1e, 0x64,
  0x9e, 0xf7, 0x32, 0x2b, 0x46, 0x29, 0xf7, 0xf8,
  0x18, 0x6c, 0xf7, 0x4a, 0xbe, 0x4b, 0xee, 0x96,
  0x90, 0x8f, 0xa2, 0x16, 0x22, 0x6a, 0xcc, 0x48,
  0x06, 0x74, 0x63, 0x43, 0x7f, 0x27, 0x22, 0x44,
  0x3c, 0x2d, 0x3b, 0x62, 0xf1, 0x1c, 0xb4, 0x27,
  0x33, 0x85, 0x26, 0x60, 0x48, 0x16, 0xcb, 0xef,
  0xf8, 0xcd, 0x37, 0x02, 0x81, 0x81, 0x00, 0xce,
  0x15, 0x43, 0x6e, 0x4b, 0x0f, 0xf9, 0x3f, 0x87,
  0xc3, 0x41, 0x45, 0x97, 0xb1, 0x49, 0xc2, 0x19,
  0x23, 0x87, 0xe4, 0x24, 0x1c, 0x64, 0xe5, 0x28,
  0xcb, 0x43, 0x10, 0x14, 0x14, 0x0e, 0x19, 0xcb,
  0xbb, 0xdb, 0xfd, 0x11, 0x9d, 0x17, 0x68, 0x78,
  0x6d, 0x61, 0x70, 0x63, 0x3a, 0xa1, 0xb3, 0xf3,
  0xa7, 0x5b, 0x0e, 0xff, 0xb7, 0x61, 0x11, 0x54,
  0x91, 0x99, 0xe5, 0x91, 0x32, 0x2d, 0xeb, 0x3f,
  0xd8, 0x3e, 0xf7, 0xd4, 0xcb, 0xd2, 0xa3, 0x41,
  0xc1, 0xee, 0xc6, 0x92, 0x13, 0xeb, 0x7f, 0x42,
  0x58, 0xf4, 0xd0, 0xb2, 0x74, 0x1d, 0x8e, 0x87,
  0x46, 0xcd, 0x14, 0xb8, 0x16, 0xad, 0xb5, 0xbd,
  0x0d, 0x6c, 0x95, 0x5a, 0x16, 0xbf, 0xe9, 0x53,
  0xda, 0xfb, 0xed, 0x83, 0x51, 0x67, 0xa9, 0x55,
  0xab, 0x54, 0x02, 0x95, 0x20, 0xa6, 0x68, 0x17,
  0x53, 0xa8, 0xea, 0x43, 0xe5, 0xb0, 0xa3, 0x02,
  0x81, 0x80, 0x67, 0x9c, 0x32, 0x83, 0x39, 0x57,
  0xff, 0x73, 0xb0, 0x89, 0x64, 0x8b, 0xd6, 0xf0,
  0x0a, 0x2d, 0xe2, 0xaf, 0x30, 0x1c, 0x2a, 0x97,
  0xf3, 0x90, 0x9a, 0xab, 0x9b, 0x0b, 0x1b, 0x43,
  0x79, 0xa0, 0xa7, 0x3d, 0xe7, 0xbe, 0x8d, 0x9c,
  0xeb, 0xdb, 0xad, 0x40, 0xdd, 0xa9, 0x00, 0x80,
  0xb8, 0xe1, 0xb3, 0xa1, 0x6c, 0x25, 0x92, 0xe4,
  0x33, 0xb2, 0xbe, 0xeb, 0x4d, 0x74, 0x26, 0x5f,
  0x37, 0x43, 0x9c, 0x6c, 0x17, 0x76, 0x0a, 0x81,
  0x20, 0x82, 0xa1, 0x48, 0x2c, 0x2d, 0x45, 0xdc,
  0x0f, 0x62, 0x43, 0x32, 0xbb, 0xeb, 0x59, 0x41,
  0xf9, 0xca, 0x58, 0xce, 0x4a, 0x66, 0x53, 0x54,
  0xc8, 0x28, 0x10, 0x1e, 0x08, 0x71, 0x16, 0xd8,
  0x02, 0x71, 0x41, 0x58, 0xd4, 0x56, 0xcc, 0xf5,
  0xb1, 0x31, 0xa3, 0xed, 0x00, 0x85, 0x09, 0xbf,
  0x35, 0x95, 0x41, 0x29, 0x40, 0x19, 0x83, 0x35,
  0x24, 0x69, 0x02, 0x81, 0x80, 0x55, 0x10, 0x0b,
  0xcc, 0x3b, 0xa9, 0x75, 0x3d, 0x16, 0xe1, 0xae,
  0x50, 0x76, 0x63, 0x94, 0x49, 0x4c, 0xad, 0x10,
  0xcb, 0x47, 0x68, 0x7c, 0xf0, 0xe5, 0xdc, 0xb8,
  0x6a, 0xab, 0x8e, 0xf7, 0x9f, 0x08, 0x2c, 0x1b,
  0x8a, 0xa2, 0xb9, 0x8f, 0xce, 0xec, 0x5e, 0x61,
  0xa8, 0xcd, 0x1c, 0x87, 0x60, 0x4a, 0xc3, 0x1a,
  0x5f, 0xdf, 0x87, 0x26, 0xc6, 0xcb, 0x7c, 0x69,
  0xe4, 0x8b, 0x01, 0x06, 0x59, 0x22, 0xfa, 0x34,
  0x4b, 0x81, 0x87, 0x3c, 0x03, 0x6d, 0x02, 0x0a,
  0x77, 0xe6, 0x15, 0xd8, 0xcf, 0xa7, 0x68, 0x26,
  0x6c, 0xfa, 0x2b, 0xd9, 0x83, 0x5a, 0x2d, 0x0c,
  0x3b, 0x70, 0x1c, 0xd4, 0x48, 0xbe, 0xa7, 0x0a,
  0xd9, 0xbe, 0xdc, 0xc3, 0x0c, 0x21, 0x33, 0xb3,
  0x66, 0xff, 0x1c, 0x1b, 0xc8, 0x96, 0x76, 0xe8,
  0x6f, 0x44, 0x74, 0xbc, 0x9b, 0x1c, 0x7d, 0xc8,
  0xac, 0x21, 0xa8, 0x6e, 0x37, 0x02, 0x81, 0x80,
  0x2c, 0x7c, 0xad, 0x1e, 0x75, 0xf6, 0x69, 0x1d,
  0xe7, 0xa6, 0xca, 0x74, 0x7d, 0x67, 0xc8, 0x65,
  0x28, 0x66, 0xc4, 0x43, 0xa6, 0xbd, 0x40, 0x57,
  0xae, 0xb7, 0x65, 0x2c, 0x52, 0xf9, 0xe4, 0xc7,
  0x81, 0x7b, 0x56, 0xa3, 0xd2, 0x0d, 0xe8, 0x33,
  0x70, 0xcf, 0x06, 0x84, 0xb3, 0x4e, 0x44, 0x50,
  0x75, 0x61, 0x96, 0x86, 0x4b, 0xb6, 0x2b, 0xad,
  0xf0, 0xad, 0x57, 0xd0, 0x37, 0x0d, 0x1d, 0x35,
  0x50, 0xcb, 0x69, 0x22, 0x39, 0x29, 0xb9, 0x3a,
  0xd3, 0x29, 0x23, 0x02, 0x60, 0xf7, 0xab, 0x30,
  0x40, 0xda, 0x8e, 0x4d, 0x45, 0x70, 0x26, 0xf4,
  0xa2, 0x0d, 0xd0, 0x64, 0x5d, 0x47, 0x3c, 0x18,
  0xf4, 0xd4, 0x52, 0x95, 0x00, 0xae, 0x84, 0x6b,
  0x47, 0xb2, 0x3c, 0x82, 0xd3, 0x72, 0x53, 0xde,
  0x72, 0x2c, 0xf7, 0xc1, 0x22, 0x36, 0xd9, 0x18,
  0x56, 0xfe, 0x39, 0x28, 0x33, 0xe0, 0xdb, 0x03
};

// Filler for returning vector references.
const std::vector<uint8_t> kEmptyVector;
}  // namespace

bool AuthenticationRoot::Initialize(OEMCrypto_ProvisioningMethod method) {
  if (prov_method_ != OEMCrypto_ProvisioningError) {
    // If provisioning method is something other than ProvisioningError
    // indicates it has already been initialized before.  Must
    // existing data.
    rsa_key_set_ = false;
    rsa_key_.reset();
    test_rsa_key_.reset();
    keybox_.reset();
    test_keybox_.reset();
  }
  prov_method_ = method;
  switch (method) {
    case OEMCrypto_DrmCertificate: {
      rsa_key_set_ = rsa_key_.LoadPkcs8RsaKey(kPrivateKey, kPrivateKeySize);
      if (!rsa_key_set_) {
        // This error message is OK in unit tests which use test certificate.
        LOGE(
            "FATAL ERROR: Platform uses a baked-in certificate instead of a "
            "keybox, but the certificate could not be loaded.");
      }
      return true;
    }
    case OEMCrypto_Keybox:
    case OEMCrypto_OEMCertificate:
      // Nothing to do yet.
      return true;
    case OEMCrypto_ProvisioningError:
    default: {
      LOGE("Invalid provisioning method: method = %d",
           static_cast<int>(method));
      prov_method_ = OEMCrypto_ProvisioningError;
      return false;
    }
  }
}

bool AuthenticationRoot::IsValid() const {
  switch (prov_method_) {
    case OEMCrypto_DrmCertificate: {
      return rsa_key_set_ && HasDeviceKey();
    }
    case OEMCrypto_Keybox: {
      return HasDeviceKey();
    }
    case OEMCrypto_OEMCertificate: {
      // TODO(sigquit): Add OEM Certificate validation.
      return true;
    }
    default: {
      LOGE("Root of trust is not properly initialized");
      return false;
    }
  }
}

OEMCryptoResult AuthenticationRoot::IsKeyboxOrOemCertValid() const {
  switch (prov_method_) {
    case OEMCrypto_Keybox: {
      WvKeybox* kb = keybox();
      if (kb == nullptr) {
        LOGW("Null keybox cannot be validated");
        return OEMCrypto_ERROR_KEYBOX_INVALID;
      }
      return kb->IsKeyboxValid();
    }
    case OEMCrypto_OEMCertificate: {
      LOGW("OEM certificate validation is not implemented");
      return OEMCrypto_ERROR_NOT_IMPLEMENTED;
    }
    case OEMCrypto_DrmCertificate: {
      return OEMCrypto_ERROR_NOT_IMPLEMENTED;
    }
    default:
      LOGE("Root of trust is not properly initialized");
      return OEMCrypto_ERROR_SYSTEM_INVALIDATED;
  }
}

OEMCryptoResult AuthenticationRoot::GetDeviceId(
    uint8_t* device_id, size_t* device_id_length) const {
  WvKeybox* kb = keybox();
  if (kb != nullptr) {
    return kb->GetDeviceId(device_id, device_id_length);
  }
  if (prov_method_ == OEMCrypto_Keybox) {
    // Keybox devices must have keybox for the source of the device
    // ID.
    LOGE("Expected keybox to be set for a device ID");
    return OEMCrypto_ERROR_NO_DEVICEID;
  }
  // For non-Keybox devices use fake device ID.
  if (device_id_length == nullptr) {
    LOGE("Output device ID length is null");
    return OEMCrypto_ERROR_INVALID_CONTEXT;
  }
  if (device_id == nullptr && *device_id_length > 0) {
    LOGE("Output device ID buffer is null");
    return OEMCrypto_ERROR_INVALID_CONTEXT;
  }
  if (*device_id_length < kFakeDeviceId.size()) {
    *device_id_length = kFakeDeviceId.size();
    return OEMCrypto_ERROR_SHORT_BUFFER;
  }
  *device_id_length = kFakeDeviceId.size();
  memcpy(device_id, kFakeDeviceId.data(), kFakeDeviceId.size());
  return OEMCrypto_SUCCESS;
}

std::vector<uint8_t> AuthenticationRoot::DeviceId() const {
  WvKeybox* kb = keybox();
  if (kb != nullptr) {
    return kb->DeviceId();
  }
  if (prov_method_ == OEMCrypto_Keybox) {
    LOGE("Expected keybox to be set for a device ID");
    return kEmptyVector;
  }
  return std::vector<uint8_t>(kFakeDeviceId.begin(), kFakeDeviceId.end());
}

std::vector<uint8_t> AuthenticationRoot::DeviceKey() const {
  WvKeybox* kb = keybox();
  if (kb != nullptr) {
    return kb->DeviceKey();
  }
  LOGE("No device key has been set");
  return kEmptyVector;
}

bool AuthenticationRoot::HasDeviceKey() const { return keybox() != nullptr; }

void AuthenticationRoot::Clear() {
  RemoveTestRsaKey();
  RemoveTestKeybox();
}

OEMCryptoResult AuthenticationRoot::LoadTestRsaKey() {
  if (prov_method_ != OEMCrypto_DrmCertificate) {
    LOGE("System does not support DRM certificates");
    return OEMCrypto_ERROR_NOT_IMPLEMENTED;
  }
  if (test_rsa_key_.get() != nullptr) {
    LOGE("Test RSA key is already loaded");
    return OEMCrypto_ERROR_INSUFFICIENT_RESOURCES;
  }
  if (!test_rsa_key_.LoadPkcs8RsaKey(
          kTestRSAPKCS8PrivateKeyInfo2_2048,
          sizeof(kTestRSAPKCS8PrivateKeyInfo2_2048))) {
    LOGE("Failed to load test RSA key");
    return OEMCrypto_ERROR_UNKNOWN_FAILURE;
  }
  rsa_key_set_ = true;
  return OEMCrypto_SUCCESS;
}

OEMCryptoResult AuthenticationRoot::IsKeyboxValid() const {
  WvKeybox* kb = keybox();
  if (kb == nullptr) {
    return OEMCrypto_ERROR_KEYBOX_INVALID;
  }
  return kb->IsKeyboxValid();
}

OEMCryptoResult AuthenticationRoot::InstallKeybox(const uint8_t* keybox_data,
                                                  size_t keybox_length) {
  if (keybox_) {
    LOGE("Keybox already installed");
    return OEMCrypto_ERROR_INSUFFICIENT_RESOURCES;
  }
  const OEMCryptoResult result =
      WvKeybox::ValidateData(keybox_data, keybox_length);
  if (result != OEMCrypto_SUCCESS) {
    LOGE("Cannot install an invalid keybox");
    return result;
  }
  keybox_ = WvKeybox::Create(keybox_data, keybox_length);
  return OEMCrypto_SUCCESS;
}

OEMCryptoResult AuthenticationRoot::InstallTestKeybox(
    const uint8_t* keybox_data, size_t keybox_length) {
  if (prov_method_ != OEMCrypto_Keybox) {
    LOGE("System does not support keybox");
    return OEMCrypto_ERROR_NOT_IMPLEMENTED;
  }
  if (test_keybox_) {
    LOGE("Test keybox already installed");
    return OEMCrypto_ERROR_INSUFFICIENT_RESOURCES;
  }
  const OEMCryptoResult result =
      WvKeybox::ValidateData(keybox_data, keybox_length);
  if (result != OEMCrypto_SUCCESS) {
    LOGE("Cannot install an invalid test keybox");
    return result;
  }
  test_keybox_ = WvKeybox::Create(keybox_data, keybox_length);
  return OEMCrypto_SUCCESS;
}

OEMCryptoResult AuthenticationRoot::GetKeyData(uint8_t* key_data,
                                               size_t* key_data_length) const {
  if (prov_method_ != OEMCrypto_Keybox) {
    LOGE("System does not support keybox");
    return OEMCrypto_ERROR_NOT_IMPLEMENTED;
  }
  WvKeybox* kb = keybox();
  if (kb == nullptr) {
    LOGE("No keybox to be set for source of key data");
    return OEMCrypto_ERROR_NO_KEYDATA;
  }
  return kb->GetKeyData(key_data, key_data_length);
}

OEMCryptoResult AuthenticationRoot::GetOemPublicCertificate(
    uint8_t* public_cert, size_t* public_cert_length) const {
  if (prov_method_ != OEMCrypto_OEMCertificate) {
    LOGE("System does not support OEM certificates");
    return OEMCrypto_ERROR_NOT_IMPLEMENTED;
  }
  LOGE("OEM certificates have not been implemented on auth root");
  return OEMCrypto_ERROR_NOT_IMPLEMENTED;
}

const std::vector<uint8_t>& AuthenticationRoot::GetOemPrivateKey() const {
  if (prov_method_ != OEMCrypto_OEMCertificate) {
    LOGE("System does not support OEM certificates");
    return kEmptyVector;
  }
  LOGE("OEM certificates have not been implemented on auth root");
  return kEmptyVector;
}
}  // namespace wvoec_ref