It is possible to generate many HOTP tokens without validating with the server, this throws the two entities out of sync, because of this, different HOTP generators provide different methods for resynchronization. When the server receives the HOTP, it also increments its counter after validating the token, thereby keeping in sync with the OTP generator. Under HOTP, the moving factor is based on a counter.Įach time a user requests for the HOTP, the counter is incremented. This is a cryptographic technique that requires a hash function such as SHA256 and a set of parameters (secret key, moving factor). The H in HOTP stands for HMAC (Hash-based Message Authentication Code). There a two main types of OTP tokens namely HOTP (HMAC-based One Time Password) and TOTP (Time-based One Time Password). There are a variety of industry-standard algorithms that are used to generate OTP tokens such as SHA256, however, they require two inputs, a static value known as a secret key and a moving factor which changes each time an OTP value is generated. OTP tokens can either be generated by a software application running on a computer or phone, or they can also be generated using hardware and there is a wide array of devices on the market providing this functionality. The One Time Password authentication method is defined in the RFC 2289 internet standard which provides a detailed explanation of how OTP is implemented. One Time Password (OTP)Ī One Time Password is a form of authentication that is used to grant access to a single login session or transaction. The latest version of java sendgrid-java uses java 11, therefore we needed to add scalacOptions ++= Seq("-java-output-version", "11") to our build. settings ( name := "othauth", version := "0.1.0-SNAPSHOT", scalaVersion := scala3Version, scalacOptions ++= Seq ( "-java-output-version", "11" ), libraryDependencies ++= Seq ( http4sDsl, emberServer, emberClient, otpJava, zxing, sendGrid, log4CatsCore, log4CatsSlf4j, sl4jApi, sl4jSimple ) ) Val scala3Version = "3.2.2" val Http4sVersion = "0.23.18" val OtpJavaVersion = "2.0.1" val ZxingVersion = "3.5.1" val SendGridVersion = "4.9.3" val Log4CatsVersion = "2.6.0" val Sl4jApiVersion = "2.0.7" val http4sDsl = "org.http4s" %% "http4s-dsl" % Http4sVersion val emberServer = "org.http4s" %% "http4s-ember-server" % Http4sVersion val emberClient = "org.http4s" %% "http4s-ember-client" % Http4sVersion val otpJava = "" % "otp-java" % OtpJavaVersion val zxing = "" % "javase" % ZxingVersion val sendGrid = "com.sendgrid" % "sendgrid-java" % SendGridVersion val log4CatsCore = "org.typelevel" %% "log4cats-core" % Log4CatsVersion val log4CatsSlf4j = "org.typelevel" %% "log4cats-slf4j" % Log4CatsVersion val sl4jApi = "org.slf4j" % "slf4j-api" % Sl4jApiVersion val sl4jSimple = "org.slf4j" % "slf4j-simple" % Sl4jApiVersion lazy val otpauth = project. To follow along with this tutorial, you will need to add the following to your build.sbt file: Here we will cover two more advanced authentication methods which include One Time Password (OTP) and Two Factor Authentication (2FA). This article is a continuation of the authentication methods that were covered in the other article on http4s authentication. It’s my biggest and most jam-packed course yet. If you want to master the Typelevel Scala libraries (including Http4s) with real-life practice, check out the Typelevel Rite of Passage course, a full-stack project-based course. You’re reading a big article about a real-life use of the Http4s library. Two Factor Authentication (2FA) Implementation in Scala 2.2 Time-based One Time Password (TOTP).2.1 HMAC-based One Time Password (HOTP).Select the hyperlink when you see it.Ĭontinue until you see a QR code, at which point you can follow the normal instructions here.Two-Factor Authentication in Scala with Http4s Proceed until you see a blue "different authenticator app" hyperlink. Select either the Two-step verification Turn on button or Add sign-in method button and choose Authenticator app from the dropdown.ĭuring the setup procedure, you'll see a dropdown menu for the verification method. If you're going through the Security dashboard, you'll need to also select Two-step verification from that screen. Depending on whether yours is a personal or business account, this may be or .ĭepending on whether yours is a personal or business account, open your Security dashboard or select Security info. In Microsoft, navigate to your account settings page. If you want to use Bitwarden Authenticator to generate TOTPs for your Microsoft Azure or Office 365 accounts, you'll need to complete the following steps: By default, Microsoft Azure and Office 365 accounts expect the use of Microsoft Authenticator for TOTPs.
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