diff --git a/libs/importer/src/importers/lastpass/access/account.ts b/libs/importer/src/importers/lastpass/access/account.ts
new file mode 100644
index 0000000000..d87c4e3ddc
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/account.ts
@@ -0,0 +1,12 @@
+export class Account {
+  id: string;
+  name: string;
+  username: string;
+  password: string;
+  url: string;
+  path: string;
+  notes: string;
+  totp: string;
+  isFavorite: boolean;
+  isShared: boolean;
+}
diff --git a/libs/importer/src/importers/lastpass/access/binary-reader.ts b/libs/importer/src/importers/lastpass/access/binary-reader.ts
new file mode 100644
index 0000000000..706afbd9e9
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/binary-reader.ts
@@ -0,0 +1,76 @@
+export class BinaryReader {
+  private position: number;
+  private isLittleEndian: boolean;
+
+  constructor(public arr: Uint8Array) {
+    this.position = 0;
+
+    const uInt32 = new Uint32Array([0x11223344]);
+    const uInt8 = new Uint8Array(uInt32.buffer);
+    this.isLittleEndian = uInt8[0] === 0x44;
+  }
+
+  readBytes(count: number): Uint8Array {
+    if (this.position + count > this.arr.length) {
+      throw "End of array reached";
+    }
+    const slice = this.arr.subarray(this.position, this.position + count);
+    this.position += count;
+    return slice;
+  }
+
+  readUInt16(): number {
+    const slice = this.readBytes(2);
+    const int = slice[0] | (slice[1] << 8);
+    // Convert to unsigned int
+    return int >>> 0;
+  }
+
+  readUInt32(): number {
+    const slice = this.readBytes(4);
+    const int = slice[0] | (slice[1] << 8) | (slice[2] << 16) | (slice[3] << 24);
+    // Convert to unsigned int
+    return int >>> 0;
+  }
+
+  readUInt16BigEndian(): number {
+    let result = this.readUInt16();
+    if (this.isLittleEndian) {
+      // Extract the two bytes
+      const byte1 = result & 0xff;
+      const byte2 = (result >> 8) & 0xff;
+      // Create a big-endian value by swapping the bytes
+      result = (byte1 << 8) | byte2;
+    }
+    return result;
+  }
+
+  readUInt32BigEndian(): number {
+    let result = this.readUInt32();
+    if (this.isLittleEndian) {
+      // Extract individual bytes
+      const byte1 = (result >> 24) & 0xff;
+      const byte2 = (result >> 16) & 0xff;
+      const byte3 = (result >> 8) & 0xff;
+      const byte4 = result & 0xff;
+      // Create a big-endian value by reordering the bytes
+      result = (byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1;
+    }
+    return result;
+  }
+
+  seekFromCurrentPosition(offset: number) {
+    const newPosition = this.position + offset;
+    if (newPosition < 0) {
+      throw "Position cannot be negative";
+    }
+    if (newPosition > this.arr.length) {
+      throw "Array not large enough to seek to this position";
+    }
+    this.position = newPosition;
+  }
+
+  atEnd(): boolean {
+    return this.position >= this.arr.length - 1;
+  }
+}
diff --git a/libs/importer/src/importers/lastpass/access/chunk.ts b/libs/importer/src/importers/lastpass/access/chunk.ts
new file mode 100644
index 0000000000..8db56d5030
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/chunk.ts
@@ -0,0 +1,4 @@
+export class Chunk {
+  id: string;
+  payload: Uint8Array;
+}
diff --git a/libs/importer/src/importers/lastpass/access/client-info.ts b/libs/importer/src/importers/lastpass/access/client-info.ts
new file mode 100644
index 0000000000..fbe13d57d6
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/client-info.ts
@@ -0,0 +1,7 @@
+import { Platform } from "./platform";
+
+export class ClientInfo {
+  platform: Platform;
+  id: string;
+  description: string;
+}
diff --git a/libs/importer/src/importers/lastpass/access/client.ts b/libs/importer/src/importers/lastpass/access/client.ts
new file mode 100644
index 0000000000..0a3c8fefe5
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/client.ts
@@ -0,0 +1,545 @@
+import { HttpStatusCode } from "@bitwarden/common/enums";
+import { Utils } from "@bitwarden/common/platform/misc/utils";
+
+import { Account } from "./account";
+import { BinaryReader } from "./binary-reader";
+import { Chunk } from "./chunk";
+import { ClientInfo } from "./client-info";
+import { CryptoUtils } from "./crypto-utils";
+import { OobResult } from "./oob-result";
+import { OtpMethod } from "./otp-method";
+import { OtpResult } from "./otp-result";
+import { Parser } from "./parser";
+import { ParserOptions } from "./parser-options";
+import { Platform } from "./platform";
+import { RestClient } from "./rest-client";
+import { Session } from "./session";
+import { SharedFolder } from "./shared-folder";
+import { Ui } from "./ui";
+
+const PlatformToUserAgent = new Map<Platform, string>([
+  [Platform.Desktop, "cli"],
+  [Platform.Mobile, "android"],
+]);
+
+const KnownOtpMethods = new Map<string, OtpMethod>([
+  ["googleauthrequired", OtpMethod.GoogleAuth],
+  ["microsoftauthrequired", OtpMethod.MicrosoftAuth],
+  ["otprequired", OtpMethod.Yubikey],
+]);
+
+export class Client {
+  constructor(private parser: Parser, private cryptoUtils: CryptoUtils) {}
+
+  async openVault(
+    username: string,
+    password: string,
+    clientInfo: ClientInfo,
+    ui: Ui,
+    options: ParserOptions
+  ): Promise<Account[]> {
+    const lowercaseUsername = username.toLowerCase();
+    const [session, rest] = await this.login(lowercaseUsername, password, clientInfo, ui);
+    try {
+      const blob = await this.downloadVault(session, rest);
+      const key = await this.cryptoUtils.deriveKey(
+        lowercaseUsername,
+        password,
+        session.keyIterationCount
+      );
+
+      let privateKey: Uint8Array = null;
+      if (session.encryptedPrivateKey != null && session.encryptedPrivateKey != "") {
+        privateKey = await this.parser.parseEncryptedPrivateKey(session.encryptedPrivateKey, key);
+      }
+
+      return this.parseVault(blob, key, privateKey, options);
+    } finally {
+      await this.logout(session, rest);
+    }
+  }
+
+  private async parseVault(
+    blob: Uint8Array,
+    encryptionKey: Uint8Array,
+    privateKey: Uint8Array,
+    options: ParserOptions
+  ): Promise<Account[]> {
+    const reader = new BinaryReader(blob);
+    const chunks = this.parser.extractChunks(reader);
+    if (!this.isComplete(chunks)) {
+      throw "Blob is truncated or corrupted";
+    }
+    return await this.parseAccounts(chunks, encryptionKey, privateKey, options);
+  }
+
+  private async parseAccounts(
+    chunks: Chunk[],
+    encryptionKey: Uint8Array,
+    privateKey: Uint8Array,
+    options: ParserOptions
+  ): Promise<Account[]> {
+    const accounts = new Array<Account>();
+    let folder: SharedFolder = null;
+    for (const chunk of chunks) {
+      if (chunk.id === "ACCT") {
+        const key = folder == null ? encryptionKey : folder.encryptionKey;
+        const account = await this.parser.parseAcct(chunk, key, folder, options);
+        if (account != null) {
+          accounts.push(account);
+        }
+      } else if (chunk.id === "SHAR") {
+        folder = await this.parser.parseShar(chunk, encryptionKey, privateKey);
+      }
+    }
+    return accounts;
+  }
+
+  private isComplete(chunks: Chunk[]): boolean {
+    if (chunks.length > 0 && chunks[chunks.length - 1].id === "ENDM") {
+      const okChunk = Utils.fromBufferToUtf8(chunks[chunks.length - 1].payload);
+      return okChunk === "OK";
+    }
+    return false;
+  }
+
+  private async login(
+    username: string,
+    password: string,
+    clientInfo: ClientInfo,
+    ui: Ui
+  ): Promise<[Session, RestClient]> {
+    const rest = new RestClient();
+    rest.baseUrl = "https://lastpass.com";
+
+    /*
+    1. First we need to request PBKDF2 key iteration count.
+    
+    We no longer request the iteration count from the server in a separate request because it
+    started to fail in weird ways. It seems there's a special combination or the UA and cookies
+    that returns the correct result. And that is not 100% reliable. After two or three attempts
+    it starts to fail again with an incorrect result.
+    
+    So we just went back a few years to the original way LastPass used to handle the iterations.
+    Namely, submit the default value and if it fails, the error would contain the correct value:
+    <response><error iterations="5000" /></response>
+    */
+    let keyIterationCount = 100_100;
+
+    let response: Document = null;
+    let session: Session = null;
+
+    // We have a maximum of 3 retries in case we need to try again with the correct domain and/or
+    // the number of KDF iterations the second/third time around.
+    for (let i = 0; i < 3; i++) {
+      // 2. Knowing the iterations count we can hash the password and log in.
+      // On the first attempt simply with the username and password.
+      response = await this.performSingleLoginRequest(
+        username,
+        password,
+        keyIterationCount,
+        new Map<string, any>(),
+        clientInfo,
+        rest
+      );
+
+      session = this.extractSessionFromLoginResponse(response, keyIterationCount, clientInfo);
+      if (session != null) {
+        return [session, rest];
+      }
+
+      // It's possible we're being redirected to another region.
+      const server = this.getOptionalErrorAttribute(response, "server");
+      if (server != null && server.trim() != "") {
+        rest.baseUrl = "https://" + server;
+        continue;
+      }
+
+      // It's possible for the request above to come back with the correct iteration count.
+      // In this case we have to parse and repeat.
+      const correctIterationCount = this.getOptionalErrorAttribute(response, "iterations");
+      if (correctIterationCount == null) {
+        break;
+      }
+
+      try {
+        keyIterationCount = parseInt(correctIterationCount);
+      } catch {
+        throw (
+          "Failed to parse the iteration count, expected an integer value '" +
+          correctIterationCount +
+          "'"
+        );
+      }
+    }
+
+    // 3. The simple login failed. This is usually due to some error, invalid credentials or
+    // a multifactor authentication being enabled.
+    const cause = this.getOptionalErrorAttribute(response, "cause");
+    if (cause == null) {
+      throw this.makeLoginError(response);
+    }
+
+    const optMethod = KnownOtpMethods.get(cause);
+    if (optMethod != null) {
+      // 3.1. One-time-password is required
+      session = await this.loginWithOtp(
+        username,
+        password,
+        keyIterationCount,
+        optMethod,
+        clientInfo,
+        ui,
+        rest
+      );
+    } else if (cause === "outofbandrequired") {
+      // 3.2. Some out-of-bound authentication is enabled. This does not require any
+      // additional input from the user.
+      session = await this.loginWithOob(
+        username,
+        password,
+        keyIterationCount,
+        this.getAllErrorAttributes(response),
+        clientInfo,
+        ui,
+        rest
+      );
+    }
+
+    // Nothing worked
+    if (session == null) {
+      throw this.makeLoginError(response);
+    }
+
+    // All good
+    return [session, rest];
+  }
+
+  private async loginWithOtp(
+    username: string,
+    password: string,
+    keyIterationCount: number,
+    method: OtpMethod,
+    clientInfo: ClientInfo,
+    ui: Ui,
+    rest: RestClient
+  ): Promise<Session> {
+    let passcode: OtpResult = null;
+    switch (method) {
+      case OtpMethod.GoogleAuth:
+        passcode = ui.provideGoogleAuthPasscode();
+        break;
+      case OtpMethod.MicrosoftAuth:
+        passcode = ui.provideMicrosoftAuthPasscode();
+        break;
+      case OtpMethod.Yubikey:
+        passcode = ui.provideYubikeyPasscode();
+        break;
+      default:
+        throw "Invalid OTP method";
+    }
+
+    if (passcode == OtpResult.cancel) {
+      throw "Second factor step is canceled by the user";
+    }
+
+    const response = await this.performSingleLoginRequest(
+      username,
+      password,
+      keyIterationCount,
+      new Map<string, string>([["otp", passcode.passcode]]),
+      clientInfo,
+      rest
+    );
+
+    const session = this.extractSessionFromLoginResponse(response, keyIterationCount, clientInfo);
+    if (session == null) {
+      throw this.makeLoginError(response);
+    }
+    if (passcode.rememberMe) {
+      await this.markDeviceAsTrusted(session, clientInfo, rest);
+    }
+    return session;
+  }
+
+  private async loginWithOob(
+    username: string,
+    password: string,
+    keyIterationCount: number,
+    parameters: Map<string, string>,
+    clientInfo: ClientInfo,
+    ui: Ui,
+    rest: RestClient
+  ): Promise<Session> {
+    const answer = this.approveOob(username, parameters, ui, rest);
+    if (answer == OobResult.cancel) {
+      throw "Out of band step is canceled by the user";
+    }
+
+    const extraParameters = new Map<string, any>();
+    if (answer.waitForOutOfBand) {
+      extraParameters.set("outofbandrequest", 1);
+    } else {
+      extraParameters.set("otp", answer.passcode);
+    }
+
+    let session: Session = null;
+    for (;;) {
+      // In case of the OOB auth the server doesn't respond instantly. This works more like a long poll.
+      // The server times out in about 10 seconds so there's no need to back off.
+      const response = await this.performSingleLoginRequest(
+        username,
+        password,
+        keyIterationCount,
+        extraParameters,
+        clientInfo,
+        rest
+      );
+
+      session = this.extractSessionFromLoginResponse(response, keyIterationCount, clientInfo);
+      if (session != null) {
+        break;
+      }
+
+      if (this.getOptionalErrorAttribute(response, "cause") != "outofbandrequired") {
+        throw this.makeLoginError(response);
+      }
+
+      // Retry
+      extraParameters.set("outofbandretry", "1");
+      extraParameters.set("outofbandretryid", this.getErrorAttribute(response, "retryid"));
+    }
+
+    if (answer.rememberMe) {
+      await this.markDeviceAsTrusted(session, clientInfo, rest);
+    }
+    return session;
+  }
+
+  private approveOob(username: string, parameters: Map<string, string>, ui: Ui, rest: RestClient) {
+    const method = parameters.get("outofbandtype");
+    if (method == null) {
+      throw "Out of band method is not specified";
+    }
+    switch (method) {
+      case "lastpassauth":
+        return ui.approveLastPassAuth();
+      case "duo":
+        return this.approveDuo(username, parameters, ui, rest);
+      case "salesforcehash":
+        return ui.approveSalesforceAuth();
+      default:
+        throw "Out of band method " + method + " is not supported";
+    }
+  }
+
+  private approveDuo(
+    username: string,
+    parameters: Map<string, string>,
+    ui: Ui,
+    rest: RestClient
+  ): OobResult {
+    return parameters.get("preferduowebsdk") == "1"
+      ? this.approveDuoWebSdk(username, parameters, ui, rest)
+      : ui.approveDuo();
+  }
+
+  private approveDuoWebSdk(
+    username: string,
+    parameters: Map<string, string>,
+    ui: Ui,
+    rest: RestClient
+  ): OobResult {
+    // TODO: implement this
+    return OobResult.cancel;
+  }
+
+  private async markDeviceAsTrusted(session: Session, clientInfo: ClientInfo, rest: RestClient) {
+    const parameters = new Map<string, string>([
+      ["uuid", clientInfo.id],
+      ["trustlabel", clientInfo.description],
+      ["token", session.token],
+    ]);
+    const response = await rest.postForm(
+      "trust.php",
+      parameters,
+      null,
+      this.getSessionCookies(session)
+    );
+    if (response.status == HttpStatusCode.Ok) {
+      return;
+    }
+    this.makeError(response);
+  }
+
+  private async logout(session: Session, rest: RestClient) {
+    const parameters = new Map<string, any>([
+      ["method", PlatformToUserAgent.get(session.platform)],
+      ["noredirect", 1],
+    ]);
+    const response = await rest.postForm(
+      "logout.php",
+      parameters,
+      null,
+      this.getSessionCookies(session)
+    );
+    if (response.status == HttpStatusCode.Ok) {
+      return;
+    }
+    this.makeError(response);
+  }
+
+  private async downloadVault(session: Session, rest: RestClient): Promise<Uint8Array> {
+    const endpoint =
+      "getaccts.php?mobile=1&b64=1&hash=0.0&hasplugin=3.0.23&requestsrc=" +
+      PlatformToUserAgent.get(session.platform);
+    const response = await rest.get(endpoint, null, this.getSessionCookies(session));
+    if (response.status == HttpStatusCode.Ok) {
+      const b64 = await response.text();
+      return Utils.fromB64ToArray(b64);
+    }
+    this.makeError(response);
+  }
+
+  private getSessionCookies(session: Session) {
+    return new Map<string, string>([["PHPSESSID", encodeURIComponent(session.id)]]);
+  }
+
+  private getErrorAttribute(response: Document, name: string): string {
+    const attr = this.getOptionalErrorAttribute(response, name);
+    if (attr != null) {
+      return attr;
+    }
+    throw "Unknown response schema: attribute " + name + " is missing";
+  }
+
+  private getOptionalErrorAttribute(response: Document, name: string): string {
+    const error = response.querySelector("response > error");
+    if (error == null) {
+      return null;
+    }
+    const attr = error.attributes.getNamedItem(name);
+    if (attr == null) {
+      return null;
+    }
+    return attr.value;
+  }
+
+  private getAllErrorAttributes(response: Document): Map<string, string> {
+    const error = response.querySelector("response > error");
+    if (error == null) {
+      return null;
+    }
+    const map = new Map<string, string>();
+    for (const attr of Array.from(error.attributes)) {
+      map.set(attr.name, attr.value);
+    }
+    return map;
+  }
+
+  private extractSessionFromLoginResponse(
+    response: Document,
+    keyIterationCount: number,
+    clientInfo: ClientInfo
+  ): Session {
+    const ok = response.querySelector("response > ok");
+    if (ok == null) {
+      return null;
+    }
+    const sessionId = ok.attributes.getNamedItem("sessionid");
+    if (sessionId == null) {
+      return null;
+    }
+    const token = ok.attributes.getNamedItem("token");
+    if (token == null) {
+      return null;
+    }
+
+    const session = new Session();
+    session.id = sessionId.value;
+    session.keyIterationCount = keyIterationCount;
+    session.token = token.value;
+    session.platform = clientInfo.platform;
+    const privateKey = ok.attributes.getNamedItem("privatekeyenc");
+    if (privateKey != null && privateKey.value != null && privateKey.value.trim() != "") {
+      session.encryptedPrivateKey = privateKey.value;
+    }
+
+    return session;
+  }
+
+  private async performSingleLoginRequest(
+    username: string,
+    password: string,
+    keyIterationCount: number,
+    extraParameters: Map<string, any>,
+    clientInfo: ClientInfo,
+    rest: RestClient
+  ) {
+    const hash = await this.cryptoUtils.deriveKeyHash(username, password, keyIterationCount);
+
+    const parameters = new Map<string, any>([
+      ["method", PlatformToUserAgent.get(clientInfo.platform)],
+      ["xml", "2"],
+      ["username", username],
+      ["hash", Utils.fromBufferToHex(hash.buffer)],
+      ["iterations", keyIterationCount],
+      ["includeprivatekeyenc", "1"],
+      ["outofbandsupported", "1"],
+      ["uuid", clientInfo.id],
+      // TODO: Test against the real server if it's ok to send this every time!
+      ["trustlabel", clientInfo.description],
+    ]);
+    for (const [key, value] of extraParameters) {
+      parameters.set(key, value);
+    }
+
+    const response = await rest.postForm("login.php", parameters);
+    if (response.status == HttpStatusCode.Ok) {
+      const text = await response.text();
+      const domParser = new window.DOMParser();
+      return domParser.parseFromString(text, "text/xml");
+    }
+    this.makeError(response);
+  }
+
+  private makeError(response: Response) {
+    // TODO: error parsing
+    throw "HTTP request to " + response.url + " failed with status " + response.status + ".";
+  }
+
+  private makeLoginError(response: Document): string {
+    const error = response.querySelector("response > error");
+    if (error == null) {
+      return "Unknown response schema";
+    }
+
+    const cause = error.attributes.getNamedItem("cause");
+    const message = error.attributes.getNamedItem("message");
+
+    if (cause != null) {
+      switch (cause.value) {
+        case "unknownemail":
+          return "Invalid username";
+        case "unknownpassword":
+          return "Invalid password";
+        case "googleauthfailed":
+        case "microsoftauthfailed":
+        case "otpfailed":
+          return "Second factor code is incorrect";
+        case "multifactorresponsefailed":
+          return "Out of band authentication failed";
+        default:
+          return message?.value ?? cause.value;
+      }
+    }
+
+    // No cause, maybe at least a message
+    if (message != null) {
+      return message.value;
+    }
+
+    // Nothing we know, just the error element
+    return "Unknown error";
+  }
+}
diff --git a/libs/importer/src/importers/lastpass/access/crypto-utils.ts b/libs/importer/src/importers/lastpass/access/crypto-utils.ts
new file mode 100644
index 0000000000..c8d9f8a168
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/crypto-utils.ts
@@ -0,0 +1,118 @@
+import { CryptoFunctionService } from "@bitwarden/common/platform/abstractions/crypto-function.service";
+import { Utils } from "@bitwarden/common/platform/misc/utils";
+
+export class CryptoUtils {
+  constructor(private cryptoFunctionService: CryptoFunctionService) {}
+
+  async deriveKey(username: string, password: string, iterationCount: number) {
+    if (iterationCount < 0) {
+      throw "Iteration count should be positive";
+    }
+    if (iterationCount == 1) {
+      return await this.cryptoFunctionService.hash(username + password, "sha256");
+    }
+    return await this.cryptoFunctionService.pbkdf2(password, username, "sha256", iterationCount);
+  }
+
+  async deriveKeyHash(username: string, password: string, iterationCount: number) {
+    const key = await this.deriveKey(username, password, iterationCount);
+    if (iterationCount == 1) {
+      return await this.cryptoFunctionService.hash(
+        Utils.fromBufferToHex(key.buffer) + password,
+        "sha256"
+      );
+    }
+    return await this.cryptoFunctionService.pbkdf2(key, password, "sha256", 1);
+  }
+
+  ExclusiveOr(arr1: Uint8Array, arr2: Uint8Array) {
+    if (arr1.length !== arr2.length) {
+      throw "Arrays must be the same length.";
+    }
+    const result = new Uint8Array(arr1.length);
+    for (let i = 0; i < arr1.length; i++) {
+      result[i] = arr1[i] ^ arr2[i];
+    }
+    return result;
+  }
+
+  async decryptAes256PlainWithDefault(
+    data: Uint8Array,
+    encryptionKey: Uint8Array,
+    defaultValue: string
+  ) {
+    try {
+      return this.decryptAes256Plain(data, encryptionKey);
+    } catch {
+      return defaultValue;
+    }
+  }
+
+  async decryptAes256Base64WithDefault(
+    data: Uint8Array,
+    encryptionKey: Uint8Array,
+    defaultValue: string
+  ) {
+    try {
+      return this.decryptAes256Base64(data, encryptionKey);
+    } catch {
+      return defaultValue;
+    }
+  }
+
+  async decryptAes256Plain(data: Uint8Array, encryptionKey: Uint8Array) {
+    if (data.length === 0) {
+      return "";
+    }
+    // Byte 33 == character '!'
+    if (data[0] === 33 && data.length % 16 === 1 && data.length > 32) {
+      return this.decryptAes256CbcPlain(data, encryptionKey);
+    }
+    return this.decryptAes256EcbPlain(data, encryptionKey);
+  }
+
+  async decryptAes256Base64(data: Uint8Array, encryptionKey: Uint8Array) {
+    if (data.length === 0) {
+      return "";
+    }
+    // Byte 33 == character '!'
+    if (data[0] === 33) {
+      return this.decryptAes256CbcBase64(data, encryptionKey);
+    }
+    return this.decryptAes256EcbBase64(data, encryptionKey);
+  }
+
+  async decryptAes256(
+    data: Uint8Array,
+    encryptionKey: Uint8Array,
+    mode: "cbc" | "ecb",
+    iv: Uint8Array = new Uint8Array(16)
+  ): Promise<string> {
+    if (data.length === 0) {
+      return "";
+    }
+    const plain = await this.cryptoFunctionService.aesDecrypt(data, iv, encryptionKey, mode);
+    return Utils.fromBufferToUtf8(plain);
+  }
+
+  private async decryptAes256EcbPlain(data: Uint8Array, encryptionKey: Uint8Array) {
+    return this.decryptAes256(data, encryptionKey, "ecb");
+  }
+
+  private async decryptAes256EcbBase64(data: Uint8Array, encryptionKey: Uint8Array) {
+    const d = Utils.fromB64ToArray(Utils.fromBufferToUtf8(data));
+    return this.decryptAes256(d, encryptionKey, "ecb");
+  }
+
+  private async decryptAes256CbcPlain(data: Uint8Array, encryptionKey: Uint8Array) {
+    const d = data.subarray(17);
+    const iv = data.subarray(1, 17);
+    return this.decryptAes256(d, encryptionKey, "cbc", iv);
+  }
+
+  private async decryptAes256CbcBase64(data: Uint8Array, encryptionKey: Uint8Array) {
+    const d = Utils.fromB64ToArray(Utils.fromBufferToUtf8(data.subarray(26)));
+    const iv = Utils.fromB64ToArray(Utils.fromBufferToUtf8(data.subarray(1, 25)));
+    return this.decryptAes256(d, encryptionKey, "cbc", iv);
+  }
+}
diff --git a/libs/importer/src/importers/lastpass/access/duo-ui.ts b/libs/importer/src/importers/lastpass/access/duo-ui.ts
new file mode 100644
index 0000000000..61b52d2582
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/duo-ui.ts
@@ -0,0 +1,34 @@
+// Adds Duo functionality to the module-specific Ui class.
+export abstract class DuoUi {
+  // To cancel return null
+  chooseDuoFactor: (devices: [DuoDevice]) => DuoChoice;
+  // To cancel return null or blank
+  provideDuoPasscode: (device: DuoDevice) => string;
+  // This updates the UI with the messages from the server.
+  updateDuoStatus: (status: DuoStatus, text: string) => void;
+}
+
+export enum DuoFactor {
+  Push,
+  Call,
+  Passcode,
+  SendPasscodesBySms,
+}
+
+export enum DuoStatus {
+  Success,
+  Error,
+  Info,
+}
+
+export interface DuoChoice {
+  device: DuoDevice;
+  factor: DuoFactor;
+  rememberMe: boolean;
+}
+
+export interface DuoDevice {
+  id: string;
+  name: string;
+  factors: DuoFactor[];
+}
diff --git a/libs/importer/src/importers/lastpass/access/oob-result.ts b/libs/importer/src/importers/lastpass/access/oob-result.ts
new file mode 100644
index 0000000000..ddd8b0d967
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/oob-result.ts
@@ -0,0 +1,17 @@
+export class OobResult {
+  static cancel = new OobResult(false, "cancel", false);
+
+  constructor(
+    public waitForOutOfBand: boolean,
+    public passcode: string,
+    public rememberMe: boolean
+  ) {}
+
+  waitForApproval(rememberMe: boolean) {
+    return new OobResult(true, "", rememberMe);
+  }
+
+  continueWithPasscode(passcode: string, rememberMe: boolean) {
+    return new OobResult(false, passcode, rememberMe);
+  }
+}
diff --git a/libs/importer/src/importers/lastpass/access/otp-method.ts b/libs/importer/src/importers/lastpass/access/otp-method.ts
new file mode 100644
index 0000000000..6b940486ff
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/otp-method.ts
@@ -0,0 +1,5 @@
+export enum OtpMethod {
+  GoogleAuth,
+  MicrosoftAuth,
+  Yubikey,
+}
diff --git a/libs/importer/src/importers/lastpass/access/otp-result.ts b/libs/importer/src/importers/lastpass/access/otp-result.ts
new file mode 100644
index 0000000000..52c2c565f6
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/otp-result.ts
@@ -0,0 +1,5 @@
+export class OtpResult {
+  static cancel = new OtpResult("cancel", false);
+
+  constructor(public passcode: string, public rememberMe: boolean) {}
+}
diff --git a/libs/importer/src/importers/lastpass/access/parser-options.ts b/libs/importer/src/importers/lastpass/access/parser-options.ts
new file mode 100644
index 0000000000..bdda099fb3
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/parser-options.ts
@@ -0,0 +1,4 @@
+export class ParserOptions {
+  static default: ParserOptions = new ParserOptions();
+  parseSecureNotesToAccount = true;
+}
diff --git a/libs/importer/src/importers/lastpass/access/parser.ts b/libs/importer/src/importers/lastpass/access/parser.ts
new file mode 100644
index 0000000000..fc4b3b4a49
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/parser.ts
@@ -0,0 +1,359 @@
+import { CryptoFunctionService } from "@bitwarden/common/platform/abstractions/crypto-function.service";
+import { Utils } from "@bitwarden/common/platform/misc/utils";
+
+import { Account } from "./account";
+import { BinaryReader } from "./binary-reader";
+import { Chunk } from "./chunk";
+import { CryptoUtils } from "./crypto-utils";
+import { ParserOptions } from "./parser-options";
+import { SharedFolder } from "./shared-folder";
+
+const AllowedSecureNoteTypes = new Set<string>([
+  "Server",
+  "Email Account",
+  "Database",
+  "Instant Messenger",
+]);
+
+export class Parser {
+  constructor(
+    private cryptoFunctionService: CryptoFunctionService,
+    private cryptoUtils: CryptoUtils
+  ) {}
+
+  /*
+  May return null when the chunk does not represent an account.
+  All secure notes are ACCTs but not all of them store account information.
+  
+  TODO: Add a test for the folder case!
+  TODO: Add a test case that covers secure note account!
+  */
+  async parseAcct(
+    chunk: Chunk,
+    encryptionKey: Uint8Array,
+    folder: SharedFolder,
+    options: ParserOptions
+  ): Promise<Account> {
+    const placeholder = "decryption failed";
+    const reader = new BinaryReader(chunk.payload);
+
+    // Read all items
+    // 0: id
+    const id = Utils.fromBufferToUtf8(this.readItem(reader));
+
+    // 1: name
+    const name = await this.cryptoUtils.decryptAes256PlainWithDefault(
+      this.readItem(reader),
+      encryptionKey,
+      placeholder
+    );
+
+    // 2: group
+    const group = await this.cryptoUtils.decryptAes256PlainWithDefault(
+      this.readItem(reader),
+      encryptionKey,
+      placeholder
+    );
+
+    // 3: url
+    let url = Utils.fromBufferToUtf8(
+      Utils.fromHexToArray(Utils.fromBufferToUtf8(this.readItem(reader)))
+    );
+
+    // Ignore "group" accounts. They have no credentials.
+    if (url == "http://group") {
+      return null;
+    }
+
+    // 4: extra (notes)
+    const notes = await this.cryptoUtils.decryptAes256PlainWithDefault(
+      this.readItem(reader),
+      encryptionKey,
+      placeholder
+    );
+
+    // 5: fav (is favorite)
+    const isFavorite = Utils.fromBufferToUtf8(this.readItem(reader)) === "1";
+
+    // 6: sharedfromaid (?)
+    this.skipItem(reader);
+
+    // 7: username
+    let username = await this.cryptoUtils.decryptAes256PlainWithDefault(
+      this.readItem(reader),
+      encryptionKey,
+      placeholder
+    );
+
+    // 8: password
+    let password = await this.cryptoUtils.decryptAes256PlainWithDefault(
+      this.readItem(reader),
+      encryptionKey,
+      placeholder
+    );
+
+    // 9: pwprotect (?)
+    this.skipItem(reader);
+
+    // 10: genpw (?)
+    this.skipItem(reader);
+
+    // 11: sn (is secure note)
+    const isSecureNote = Utils.fromBufferToUtf8(this.readItem(reader)) === "1";
+
+    // Parse secure note
+    if (options.parseSecureNotesToAccount && isSecureNote) {
+      let type = "";
+      // ParseSecureNoteServer
+      for (const i of notes.split("\n")) {
+        const keyValue = i.split(":", 2);
+        if (keyValue.length < 2) {
+          continue;
+        }
+        switch (keyValue[0]) {
+          case "NoteType":
+            type = keyValue[1];
+            break;
+          case "Hostname":
+            url = keyValue[1];
+            break;
+          case "Username":
+            username = keyValue[1];
+            break;
+          case "Password":
+            password = keyValue[1];
+            break;
+        }
+      }
+
+      // Only the some secure notes contain account-like information
+      if (!AllowedSecureNoteTypes.has(type)) {
+        return null;
+      }
+    }
+
+    // 12: last_touch_gmt (?)
+    this.skipItem(reader);
+
+    // 13: autologin (?)
+    this.skipItem(reader);
+
+    // 14: never_autofill (?)
+    this.skipItem(reader);
+
+    // 15: realm (?)
+    this.skipItem(reader);
+
+    // 16: id_again (?)
+    this.skipItem(reader);
+
+    // 17: custom_js (?)
+    this.skipItem(reader);
+
+    // 18: submit_id (?)
+    this.skipItem(reader);
+
+    // 19: captcha_id (?)
+    this.skipItem(reader);
+
+    // 20: urid (?)
+    this.skipItem(reader);
+
+    // 21: basic_auth (?)
+    this.skipItem(reader);
+
+    // 22: method (?)
+    this.skipItem(reader);
+
+    // 23: action (?)
+    this.skipItem(reader);
+
+    // 24: groupid (?)
+    this.skipItem(reader);
+
+    // 25: deleted (?)
+    this.skipItem(reader);
+
+    // 26: attachkey (?)
+    this.skipItem(reader);
+
+    // 27: attachpresent (?)
+    this.skipItem(reader);
+
+    // 28: individualshare (?)
+    this.skipItem(reader);
+
+    // 29: notetype (?)
+    this.skipItem(reader);
+
+    // 30: noalert (?)
+    this.skipItem(reader);
+
+    // 31: last_modified_gmt (?)
+    this.skipItem(reader);
+
+    // 32: hasbeenshared (?)
+    this.skipItem(reader);
+
+    // 33: last_pwchange_gmt (?)
+    this.skipItem(reader);
+
+    // 34: created_gmt (?)
+    this.skipItem(reader);
+
+    // 35: vulnerable (?)
+    this.skipItem(reader);
+
+    // 36: pwch (?)
+    this.skipItem(reader);
+
+    // 37: breached (?)
+    this.skipItem(reader);
+
+    // 38: template (?)
+    this.skipItem(reader);
+
+    // 39: totp (?)
+    const totp = await this.cryptoUtils.decryptAes256PlainWithDefault(
+      this.readItem(reader),
+      encryptionKey,
+      placeholder
+    );
+
+    // 3 more left. Don't even bother skipping them.
+
+    // 40: trustedHostnames (?)
+    // 41: last_credential_monitoring_gmt (?)
+    // 42: last_credential_monitoring_stat (?)
+
+    // Adjust the path to include the group and the shared folder, if any.
+    const path = this.makeAccountPath(group, folder);
+
+    const account = new Account();
+    account.id = id;
+    account.name = name;
+    account.username = username;
+    account.password = password;
+    account.url = url;
+    account.path = path;
+    account.notes = notes;
+    account.totp = totp;
+    account.isFavorite = isFavorite;
+    account.isShared = folder != null;
+    return account;
+  }
+
+  async parseShar(
+    chunk: Chunk,
+    encryptionKey: Uint8Array,
+    rsaKey: Uint8Array
+  ): Promise<SharedFolder> {
+    const reader = new BinaryReader(chunk.payload);
+
+    // Id
+    const id = Utils.fromBufferToUtf8(this.readItem(reader));
+
+    // Key
+    const folderKey = this.readItem(reader);
+    const rsaEncryptedFolderKey = Utils.fromHexToArray(Utils.fromBufferToUtf8(folderKey));
+    const decFolderKey = await this.cryptoFunctionService.rsaDecrypt(
+      rsaEncryptedFolderKey,
+      rsaKey,
+      "sha1"
+    );
+    const key = Utils.fromHexToArray(Utils.fromBufferToUtf8(decFolderKey));
+
+    // Name
+    const encryptedName = this.readItem(reader);
+    const name = await this.cryptoUtils.decryptAes256Base64(encryptedName, key);
+
+    const folder = new SharedFolder();
+    folder.id = id;
+    folder.name = name;
+    folder.encryptionKey = key;
+    return folder;
+  }
+
+  async parseEncryptedPrivateKey(encryptedPrivateKey: string, encryptionKey: Uint8Array) {
+    const decrypted = await this.cryptoUtils.decryptAes256(
+      Utils.fromHexToArray(encryptedPrivateKey),
+      encryptionKey,
+      "cbc",
+      encryptionKey.subarray(0, 16)
+    );
+
+    const header = "LastPassPrivateKey<";
+    const footer = ">LastPassPrivateKey";
+    if (!decrypted.startsWith(header) || !decrypted.endsWith(footer)) {
+      throw "Failed to decrypt private key";
+    }
+
+    const parsedKey = decrypted.substring(header.length, decrypted.length - footer.length);
+    const pkcs8 = Utils.fromHexToArray(parsedKey);
+    return pkcs8;
+  }
+
+  makeAccountPath(group: string, folder: SharedFolder): string {
+    const groupEmpty = group == null || group.trim() === "";
+    if (folder == null) {
+      return groupEmpty ? "(none)" : group;
+    }
+    return groupEmpty ? folder.name : folder.name + "\\" + group;
+  }
+
+  extractChunks(reader: BinaryReader): Chunk[] {
+    const chunks = new Array<Chunk>();
+    while (!reader.atEnd()) {
+      const chunk = this.readChunk(reader);
+      chunks.push(chunk);
+
+      // TODO: catch end of stream exception?
+      // In case the stream is truncated we just ignore the incomplete chunk.
+    }
+    return chunks;
+  }
+
+  private readChunk(reader: BinaryReader): Chunk {
+    /*
+    LastPass blob chunk is made up of 4-byte ID, big endian 4-byte size and payload of that size
+    Example:
+      0000: 'IDID'
+      0004: 4
+      0008: 0xDE 0xAD 0xBE 0xEF
+      000C: --- Next chunk ---
+    */
+    const chunk = new Chunk();
+    chunk.id = this.readId(reader);
+    chunk.payload = this.readPayload(reader, this.readSize(reader));
+    return chunk;
+  }
+
+  private readItem(reader: BinaryReader): Uint8Array {
+    /*
+    An item in an itemized chunk is made up of the big endian size and the payload of that size
+    Example:
+      0000: 4
+      0004: 0xDE 0xAD 0xBE 0xEF
+      0008: --- Next item ---
+    See readItem for item description.
+    */
+    return this.readPayload(reader, this.readSize(reader));
+  }
+
+  private skipItem(reader: BinaryReader): void {
+    // See readItem for item description.
+    reader.seekFromCurrentPosition(this.readSize(reader));
+  }
+
+  private readId(reader: BinaryReader): string {
+    return Utils.fromBufferToUtf8(reader.readBytes(4));
+  }
+
+  private readSize(reader: BinaryReader): number {
+    return reader.readUInt32BigEndian();
+  }
+
+  private readPayload(reader: BinaryReader, size: number): Uint8Array {
+    return reader.readBytes(size);
+  }
+}
diff --git a/libs/importer/src/importers/lastpass/access/platform.ts b/libs/importer/src/importers/lastpass/access/platform.ts
new file mode 100644
index 0000000000..283e0c36ce
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/platform.ts
@@ -0,0 +1,4 @@
+export enum Platform {
+  Desktop,
+  Mobile,
+}
diff --git a/libs/importer/src/importers/lastpass/access/rest-client.ts b/libs/importer/src/importers/lastpass/access/rest-client.ts
new file mode 100644
index 0000000000..b26109d8e8
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/rest-client.ts
@@ -0,0 +1,99 @@
+export class RestClient {
+  baseUrl: string;
+  isBrowser = true;
+
+  async get(
+    endpoint: string,
+    headers: Map<string, string> = null,
+    cookies: Map<string, string> = null
+  ): Promise<Response> {
+    const requestInit: RequestInit = {
+      method: "GET",
+      credentials: "include",
+    };
+    this.setHeaders(requestInit, headers, cookies);
+    const request = new Request(this.baseUrl + "/" + endpoint, requestInit);
+    const response = await fetch(request);
+    return response;
+  }
+
+  async postForm(
+    endpoint: string,
+    parameters: Map<string, any> = null,
+    headers: Map<string, string> = null,
+    cookies: Map<string, string> = null
+  ): Promise<Response> {
+    const setBody = (requestInit: RequestInit, headerMap: Map<string, string>) => {
+      if (parameters != null && parameters.size > 0) {
+        const form = new FormData();
+        for (const [key, value] of parameters) {
+          form.set(key, value);
+        }
+        requestInit.body = form;
+      }
+    };
+    return await this.post(endpoint, setBody, headers, cookies);
+  }
+
+  async postJson(
+    endpoint: string,
+    body: any,
+    headers: Map<string, string> = null,
+    cookies: Map<string, string> = null
+  ): Promise<Response> {
+    const setBody = (requestInit: RequestInit, headerMap: Map<string, string>) => {
+      if (body != null) {
+        if (headerMap == null) {
+          headerMap = new Map<string, string>();
+        }
+        headerMap.set("Content-Type", "application/json; charset=utf-8");
+        requestInit.body = JSON.stringify(body);
+      }
+    };
+    return await this.post(endpoint, setBody, headers, cookies);
+  }
+
+  private async post(
+    endpoint: string,
+    setBody: (requestInit: RequestInit, headers: Map<string, string>) => void,
+    headers: Map<string, string> = null,
+    cookies: Map<string, string> = null
+  ) {
+    const requestInit: RequestInit = {
+      method: "POST",
+      credentials: "include",
+    };
+    setBody(requestInit, headers);
+    this.setHeaders(requestInit, headers, cookies);
+    const request = new Request(this.baseUrl + "/" + endpoint, requestInit);
+    const response = await fetch(request);
+    return response;
+  }
+
+  private setHeaders(
+    requestInit: RequestInit,
+    headers: Map<string, string> = null,
+    cookies: Map<string, string> = null
+  ) {
+    const requestHeaders = new Headers();
+    let setHeaders = false;
+    if (headers != null && headers.size > 0) {
+      setHeaders = true;
+      for (const [key, value] of headers) {
+        requestHeaders.set(key, value);
+      }
+    }
+    // Cookies should be already automatically set for this origin by the browser
+    // TODO: set cookies for non-browser scenarios?
+    if (!this.isBrowser && cookies != null && cookies.size > 0) {
+      setHeaders = true;
+      const cookieString = Array.from(cookies.keys())
+        .map((key) => `${key}=${cookies.get(key)}`)
+        .join("; ");
+      requestHeaders.set("cookie", cookieString);
+    }
+    if (setHeaders) {
+      requestInit.headers = requestHeaders;
+    }
+  }
+}
diff --git a/libs/importer/src/importers/lastpass/access/session.ts b/libs/importer/src/importers/lastpass/access/session.ts
new file mode 100644
index 0000000000..4c71287263
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/session.ts
@@ -0,0 +1,9 @@
+import { Platform } from "./platform";
+
+export class Session {
+  id: string;
+  keyIterationCount: number;
+  token: string;
+  platform: Platform;
+  encryptedPrivateKey: string;
+}
diff --git a/libs/importer/src/importers/lastpass/access/shared-folder.ts b/libs/importer/src/importers/lastpass/access/shared-folder.ts
new file mode 100644
index 0000000000..a9d3eb1346
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/shared-folder.ts
@@ -0,0 +1,5 @@
+export class SharedFolder {
+  id: string;
+  name: string;
+  encryptionKey: Uint8Array;
+}
diff --git a/libs/importer/src/importers/lastpass/access/ui.ts b/libs/importer/src/importers/lastpass/access/ui.ts
new file mode 100644
index 0000000000..fad8659618
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/ui.ts
@@ -0,0 +1,29 @@
+import { DuoUi } from "./duo-ui";
+import { OobResult } from "./oob-result";
+import { OtpResult } from "./otp-result";
+
+export abstract class Ui extends DuoUi {
+  // To cancel return OtpResult.Cancel, otherwise only valid data is expected.
+  provideGoogleAuthPasscode: () => OtpResult;
+  provideMicrosoftAuthPasscode: () => OtpResult;
+  provideYubikeyPasscode: () => OtpResult;
+
+  /*
+  The UI implementations should provide the following possibilities for the user:
+  
+  1. Cancel. Return OobResult.Cancel to cancel.
+  
+  2. Go through with the out-of-band authentication where a third party app is used to approve or decline
+      the action. In this case return OobResult.waitForApproval(rememberMe). The UI should return as soon
+      as possible to allow the library to continue polling the service. Even though it's possible to return
+      control to the library only after the user performed the out-of-band action, it's not necessary. It
+      could be also done sooner.
+  
+  3. Allow the user to provide the passcode manually. All supported OOB methods allow to enter the
+      passcode instead of performing an action in the app. In this case the UI should return
+      OobResult.continueWithPasscode(passcode, rememberMe).
+  */
+  approveLastPassAuth: () => OobResult;
+  approveDuo: () => OobResult;
+  approveSalesforceAuth: () => OobResult;
+}
diff --git a/libs/importer/src/importers/lastpass/access/user-type.ts b/libs/importer/src/importers/lastpass/access/user-type.ts
new file mode 100644
index 0000000000..8321cfa736
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/user-type.ts
@@ -0,0 +1,34 @@
+export class UserType {
+  /*
+    Type values
+    0 = Master Password
+    3 = Federated
+    */
+  type: number;
+  IdentityProviderGUID: string;
+  IdentityProviderURL: string;
+  OpenIDConnectAuthority: string;
+  OpenIDConnectClientId: string;
+  CompanyId: number;
+  /*
+    Provider Values
+    0 = LastPass
+    2 = Okta
+    */
+  Provider: number;
+  PkceEnabled: boolean;
+  IsPasswordlessEnabled: boolean;
+
+  isFederated(): boolean {
+    return (
+      this.type === 3 &&
+      this.hasValue(this.IdentityProviderURL) &&
+      this.hasValue(this.OpenIDConnectAuthority) &&
+      this.hasValue(this.OpenIDConnectClientId)
+    );
+  }
+
+  private hasValue(str: string) {
+    return str != null && str.trim() !== "";
+  }
+}
diff --git a/libs/importer/src/importers/lastpass/access/vault.ts b/libs/importer/src/importers/lastpass/access/vault.ts
new file mode 100644
index 0000000000..6cbee8028c
--- /dev/null
+++ b/libs/importer/src/importers/lastpass/access/vault.ts
@@ -0,0 +1,94 @@
+import { HttpStatusCode } from "@bitwarden/common/enums";
+import { CryptoFunctionService } from "@bitwarden/common/platform/abstractions/crypto-function.service";
+import { Utils } from "@bitwarden/common/platform/misc/utils";
+
+import { Account } from "./account";
+import { Client } from "./client";
+import { ClientInfo } from "./client-info";
+import { CryptoUtils } from "./crypto-utils";
+import { Parser } from "./parser";
+import { ParserOptions } from "./parser-options";
+import { RestClient } from "./rest-client";
+import { Ui } from "./ui";
+import { UserType } from "./user-type";
+
+export class Vault {
+  accounts: Account[];
+
+  private client: Client;
+  private cryptoUtils: CryptoUtils;
+
+  constructor(private cryptoFunctionService: CryptoFunctionService) {
+    this.cryptoUtils = new CryptoUtils(cryptoFunctionService);
+    const parser = new Parser(cryptoFunctionService, this.cryptoUtils);
+    this.client = new Client(parser, this.cryptoUtils);
+  }
+
+  async open(
+    username: string,
+    password: string,
+    clientInfo: ClientInfo,
+    ui: Ui,
+    parserOptions: ParserOptions = ParserOptions.default
+  ): Promise<void> {
+    this.accounts = await this.client.openVault(username, password, clientInfo, ui, parserOptions);
+  }
+
+  async openFederated(
+    username: string,
+    k1: string,
+    k2: string,
+    clientInfo: ClientInfo,
+    ui: Ui,
+    parserOptions: ParserOptions = ParserOptions.default
+  ): Promise<void> {
+    const k1Arr = Utils.fromByteStringToArray(k1);
+    const k2Arr = Utils.fromB64ToArray(k2);
+    const hiddenPasswordArr = await this.cryptoFunctionService.hash(
+      this.cryptoUtils.ExclusiveOr(k1Arr, k2Arr),
+      "sha256"
+    );
+    const hiddenPassword = Utils.fromBufferToB64(hiddenPasswordArr);
+    await this.open(username, hiddenPassword, clientInfo, ui, parserOptions);
+  }
+
+  async getUserType(username: string): Promise<UserType> {
+    const lowercaseUsername = username.toLowerCase();
+    const rest = new RestClient();
+    rest.baseUrl = "https://lastpass.com";
+    const endpoint = "lmiapi/login/type?username=" + encodeURIComponent(lowercaseUsername);
+    const response = await rest.get(endpoint);
+    if (response.status === HttpStatusCode.Ok) {
+      const json = await response.json();
+      const userType = new UserType();
+      userType.CompanyId = json.CompanyId;
+      userType.IdentityProviderGUID = json.IdentityProviderGUID;
+      userType.IdentityProviderURL = json.IdentityProviderURL;
+      userType.IsPasswordlessEnabled = json.IsPasswordlessEnabled;
+      userType.OpenIDConnectAuthority = json.OpenIDConnectAuthority;
+      userType.OpenIDConnectClientId = json.OpenIDConnectClientId;
+      userType.PkceEnabled = json.PkceEnabled;
+      userType.Provider = json.Provider;
+      userType.type = json.type;
+      return userType;
+    }
+    throw "Cannot determine LastPass user type.";
+  }
+
+  async getIdentityProviderKey(userType: UserType, idToken: string): Promise<string> {
+    if (!userType.isFederated()) {
+      throw "Cannot get identity provider key for a LastPass user that is not federated.";
+    }
+    const rest = new RestClient();
+    rest.baseUrl = userType.IdentityProviderURL;
+    const response = await rest.postJson("federatedlogin/api/v1/getkey", {
+      company_id: userType.CompanyId,
+      id_token: idToken,
+    });
+    if (response.status === HttpStatusCode.Ok) {
+      const json = await response.json();
+      return json["k2"] as string;
+    }
+    throw "Cannot get identity provider key from LastPass.";
+  }
+}