C++ CryptoBuffer::SetLength方法代码示例

already_AddRefed<Promise>
WebAuthentication::GetAssertion(const ArrayBufferViewOrArrayBuffer& aChallenge,
                                const AssertionOptions& aOptions)
{
  MOZ_ASSERT(mParent);
  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetParentObject());
  if (!global) {
    return nullptr;
  }

  // 4.1.2.1 If timeoutSeconds was specified, check if its value lies within a
  // reasonable range as defined by the platform and if not, correct it to the
  // closest value lying within that range.

  double adjustedTimeout = 30.0;
  if (aOptions.mTimeoutSeconds.WasPassed()) {
    adjustedTimeout = aOptions.mTimeoutSeconds.Value();
    adjustedTimeout = std::max(15.0, adjustedTimeout);
    adjustedTimeout = std::min(120.0, adjustedTimeout);
  }

  // 4.1.2.2 Let promise be a new Promise. Return promise and start a timer for
  // adjustedTimeout seconds.

  RefPtr<AssertionRequest> requestMonitor = new AssertionRequest();
  requestMonitor->SetDeadline(TimeDuration::FromSeconds(adjustedTimeout));

  ErrorResult rv;
  RefPtr<Promise> promise = Promise::Create(global, rv);

  nsresult initRv = InitLazily();
  if (NS_FAILED(initRv)) {
    promise->MaybeReject(initRv);
    return promise.forget();
  }

  if (mOrigin.EqualsLiteral("null")) {
    // 4.1.2.3 If callerOrigin is an opaque origin, reject promise with a
    // DOMException whose name is "NotAllowedError", and terminate this algorithm
    promise->MaybeReject(NS_ERROR_DOM_NOT_ALLOWED_ERR);
    return promise.forget();
  }

  nsCString rpId;
  if (!aOptions.mRpId.WasPassed()) {
    // 4.1.2.3.a If rpId is not specified, then set rpId to callerOrigin, and
    // rpIdHash to the SHA-256 hash of rpId.
    rpId.Assign(NS_ConvertUTF16toUTF8(mOrigin));
  } else {
    // 4.1.2.3.b If rpId is specified, then invoke the procedure used for
    // relaxing the same-origin restriction by setting the document.domain
    // attribute, using rpId as the given value but without changing the current
    // document’s domain. If no errors are thrown, set rpId to the value of host
    // as computed by this procedure, and rpIdHash to the SHA-256 hash of rpId.
    // Otherwise, reject promise with a DOMException whose name is
    // "SecurityError", and terminate this algorithm.

    if (NS_FAILED(RelaxSameOrigin(aOptions.mRpId.Value(), rpId))) {
      promise->MaybeReject(NS_ERROR_DOM_SECURITY_ERR);
      return promise.forget();
    }
  }

  CryptoBuffer rpIdHash;
  if (!rpIdHash.SetLength(SHA256_LENGTH, fallible)) {
    promise->MaybeReject(NS_ERROR_DOM_SECURITY_ERR);
    return promise.forget();
  }

  nsresult srv;
  nsCOMPtr<nsICryptoHash> hashService =
    do_CreateInstance(NS_CRYPTO_HASH_CONTRACTID, &srv);
  if (NS_WARN_IF(NS_FAILED(srv))) {
    promise->MaybeReject(NS_ERROR_DOM_SECURITY_ERR);
    return promise.forget();
  }

  srv = HashCString(hashService, rpId, rpIdHash);
  if (NS_WARN_IF(NS_FAILED(srv))) {
    promise->MaybeReject(NS_ERROR_DOM_SECURITY_ERR);
    return promise.forget();
  }

  // 4.1.2.4 If extensions was specified, process any extensions supported by
  // this client platform, to produce the extension data that needs to be sent
  // to the authenticator. If an error is encountered while processing an
  // extension, skip that extension and do not produce any extension data for
  // it. Call the result of this processing clientExtensions.

  // TODO

  // 4.1.2.5 Use assertionChallenge, callerOrigin and rpId, along with the token
  // binding key associated with callerOrigin (if any), to create a ClientData
  // structure representing this request. Choose a hash algorithm for hashAlg
  // and compute the clientDataJSON and clientDataHash.
  CryptoBuffer challenge;
  if (!challenge.Assign(aChallenge)) {
    promise->MaybeReject(NS_ERROR_DOM_SECURITY_ERR);
    return promise.forget();
  }
//.........这里部分代码省略.........

NS_IMETHODIMP
U2FSignTask::Run()
{
  nsNSSShutDownPreventionLock locker;
  if (isAlreadyShutDown()) {
    ReturnError(ErrorCode::OTHER_ERROR);
    return NS_ERROR_FAILURE;
  }

  // Search the requests for one a token can fulfill
  for (size_t i = 0; i < mRegisteredKeys.Length(); i += 1) {
    RegisteredKey request(mRegisteredKeys[i]);

    // Check for required attributes
    if (!(request.mVersion.WasPassed() &&
          request.mKeyHandle.WasPassed())) {
      continue;
    }

    // Do not permit an individual RegisteredKey to assert a different AppID
    if (request.mAppId.WasPassed() && mAppId != request.mAppId.Value()) {
      continue;
    }

    // Assemble a clientData object
    CryptoBuffer clientData;
    nsresult rv = AssembleClientData(mOrigin, kGetAssertion, mChallenge,
                                     clientData);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      ReturnError(ErrorCode::OTHER_ERROR);
      return NS_ERROR_FAILURE;
    }

    // Hash the AppID and the ClientData into the AppParam and ChallengeParam
    SECStatus srv;
    nsCString cAppId = NS_ConvertUTF16toUTF8(mAppId);
    CryptoBuffer appParam;
    CryptoBuffer challengeParam;
    if (!appParam.SetLength(SHA256_LENGTH, fallible) ||
        !challengeParam.SetLength(SHA256_LENGTH, fallible)) {
      ReturnError(ErrorCode::OTHER_ERROR);
      return NS_ERROR_FAILURE;
    }

    srv = PK11_HashBuf(SEC_OID_SHA256, appParam.Elements(),
                       reinterpret_cast<const uint8_t*>(cAppId.BeginReading()),
                       cAppId.Length());
    if (srv != SECSuccess) {
      ReturnError(ErrorCode::OTHER_ERROR);
      return NS_ERROR_FAILURE;
    }

    srv = PK11_HashBuf(SEC_OID_SHA256, challengeParam.Elements(),
                       clientData.Elements(), clientData.Length());
    if (srv != SECSuccess) {
      ReturnError(ErrorCode::OTHER_ERROR);
      return NS_ERROR_FAILURE;
    }

    // Decode the key handle
    CryptoBuffer keyHandle;
    rv = keyHandle.FromJwkBase64(request.mKeyHandle.Value());
    if (NS_WARN_IF(NS_FAILED(rv))) {
      ReturnError(ErrorCode::OTHER_ERROR);
      return NS_ERROR_FAILURE;
    }

    // Get the signature from the token
    CryptoBuffer signatureData;
    bool signSuccess = false;

    // We ignore mTransports, as it is intended to be used for sorting the
    // available devices by preference, but is not an exclusion factor.

    for (size_t a = 0; a < mAuthenticators.Length() && !signSuccess; ++a) {
      Authenticator token(mAuthenticators[a]);
      bool isCompatible = false;
      bool isRegistered = false;

      rv = token->IsCompatibleVersion(request.mVersion.Value(), &isCompatible);
      if (NS_FAILED(rv)) {
        ReturnError(ErrorCode::OTHER_ERROR);
        return NS_ERROR_FAILURE;
      }
      if (!isCompatible) {
        continue;
      }

      rv = token->IsRegistered(keyHandle.Elements(), keyHandle.Length(),
                               &isRegistered);
      if (NS_FAILED(rv)) {
        ReturnError(ErrorCode::OTHER_ERROR);
        return NS_ERROR_FAILURE;
      }

      if (isCompatible && isRegistered) {
        uint8_t* buffer;
        uint32_t bufferlen;
        nsresult rv = token->Sign(appParam.Elements(), appParam.Length(),
                                  challengeParam.Elements(), challengeParam.Length(),
//.........这里部分代码省略.........

already_AddRefed<Promise>
WebAuthentication::MakeCredential(JSContext* aCx, const Account& aAccount,
                  const Sequence<ScopedCredentialParameters>& aCryptoParameters,
                  const ArrayBufferViewOrArrayBuffer& aChallenge,
                  const ScopedCredentialOptions& aOptions)
{
  MOZ_ASSERT(mParent);
  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(GetParentObject());
  if (!global) {
    return nullptr;
  }

  ErrorResult rv;
  RefPtr<Promise> promise = Promise::Create(global, rv);

  nsresult initRv = InitLazily();
  if (NS_FAILED(initRv)) {
    promise->MaybeReject(initRv);
    return promise.forget();
  }

  // 4.1.1.1 If timeoutSeconds was specified, check if its value lies within a
  // reasonable range as defined by the platform and if not, correct it to the
  // closest value lying within that range.

  double adjustedTimeout = 30.0;
  if (aOptions.mTimeoutSeconds.WasPassed()) {
    adjustedTimeout = aOptions.mTimeoutSeconds.Value();
    adjustedTimeout = std::max(15.0, adjustedTimeout);
    adjustedTimeout = std::min(120.0, adjustedTimeout);
  }

  // 4.1.1.2 Let promise be a new Promise. Return promise and start a timer for
  // adjustedTimeout seconds.

  RefPtr<CredentialRequest> requestMonitor = new CredentialRequest();
  requestMonitor->SetDeadline(TimeDuration::FromSeconds(adjustedTimeout));

  if (mOrigin.EqualsLiteral("null")) {
    // 4.1.1.3 If callerOrigin is an opaque origin, reject promise with a
    // DOMException whose name is "NotAllowedError", and terminate this
    // algorithm
    MOZ_LOG(gWebauthLog, LogLevel::Debug, ("Rejecting due to opaque origin"));
    promise->MaybeReject(NS_ERROR_DOM_NOT_ALLOWED_ERR);
    return promise.forget();
  }

  nsCString rpId;
  if (!aOptions.mRpId.WasPassed()) {
    // 4.1.1.3.a If rpId is not specified, then set rpId to callerOrigin, and
    // rpIdHash to the SHA-256 hash of rpId.
    rpId.Assign(NS_ConvertUTF16toUTF8(mOrigin));
  } else {
    // 4.1.1.3.b If rpId is specified, then invoke the procedure used for
    // relaxing the same-origin restriction by setting the document.domain
    // attribute, using rpId as the given value but without changing the current
    // document’s domain. If no errors are thrown, set rpId to the value of host
    // as computed by this procedure, and rpIdHash to the SHA-256 hash of rpId.
    // Otherwise, reject promise with a DOMException whose name is
    // "SecurityError", and terminate this algorithm.

    if (NS_FAILED(RelaxSameOrigin(aOptions.mRpId.Value(), rpId))) {
      promise->MaybeReject(NS_ERROR_DOM_SECURITY_ERR);
      return promise.forget();
    }
  }

  CryptoBuffer rpIdHash;
  if (!rpIdHash.SetLength(SHA256_LENGTH, fallible)) {
    promise->MaybeReject(NS_ERROR_OUT_OF_MEMORY);
    return promise.forget();
  }

  nsresult srv;
  nsCOMPtr<nsICryptoHash> hashService =
    do_CreateInstance(NS_CRYPTO_HASH_CONTRACTID, &srv);
  if (NS_WARN_IF(NS_FAILED(srv))) {
    promise->MaybeReject(NS_ERROR_DOM_SECURITY_ERR);
    return promise.forget();
  }

  srv = HashCString(hashService, rpId, rpIdHash);
  if (NS_WARN_IF(NS_FAILED(srv))) {
    promise->MaybeReject(NS_ERROR_DOM_SECURITY_ERR);
    return promise.forget();
  }

  // 4.1.1.4 Process each element of cryptoParameters using the following steps,
  // to produce a new sequence normalizedParameters.
  nsTArray<ScopedCredentialParameters> normalizedParams;
  for (size_t a = 0; a < aCryptoParameters.Length(); ++a) {
    // 4.1.1.4.a Let current be the currently selected element of
    // cryptoParameters.

    // 4.1.1.4.b If current.type does not contain a ScopedCredentialType
    // supported by this implementation, then stop processing current and move
    // on to the next element in cryptoParameters.
    if (aCryptoParameters[a].mType != ScopedCredentialType::ScopedCred) {
      continue;
    }
//.........这里部分代码省略.........