diff --git a/src/com/cringe_studios/cringe_authenticator_library/OTP.java b/src/com/cringe_studios/cringe_authenticator_library/OTP.java
index 3bb08db..4111f5e 100644
--- a/src/com/cringe_studios/cringe_authenticator_library/OTP.java
+++ b/src/com/cringe_studios/cringe_authenticator_library/OTP.java
@@ -1,5 +1,53 @@
 package com.cringe_studios.cringe_authenticator_library;
 
-public class Auth {
-
-}
+public interface OTP {
+	//TOTP
+	//HOTP
+	
+	protected String secret;
+	protected OTPType type;
+	protected OTPAlgorithm algorithm;
+	protected long digits;
+	protected long counter;
+	protected long period;
+	
+	//secret: required
+	//algorithm: optional (default SHA1)
+	//digits: optional (default 6)
+	//OTPType: required
+	//period: optional (default 30)
+	//counter: required if hotp
+	public static OTP createNewOTP(OTPType type, String secret, OTPAlgorithm algorithm, long digits, long counter, long periodInSeconds) {
+		return null;
+	}
+	
+	public long getNextDueTime();
+	
+	public String getPin();
+	
+	public String updatePin();
+	
+	default public String getSecret() {
+		return this.secret;
+	}
+	
+	default public OTPType getOTPType() {
+		return this.type;
+	}
+	
+	default public OTPAlgorithm getAlgorithm() {
+		return algorithm;
+	}
+	
+	default public long getDigits() {
+		return this.digits;
+	}
+	
+	default public long getCounter() {
+		return this.counter;
+	}
+	
+	default public long getPeriod() {
+		return this.period;
+	}
+}
\ No newline at end of file
diff --git a/src/com/cringe_studios/cringe_authenticator_library/OTPAlgorithm.java b/src/com/cringe_studios/cringe_authenticator_library/OTPAlgorithm.java
new file mode 100644
index 0000000..f2ea61b
--- /dev/null
+++ b/src/com/cringe_studios/cringe_authenticator_library/OTPAlgorithm.java
@@ -0,0 +1,13 @@
+package com.cringe_studios.cringe_authenticator_library;
+
+public enum OTPAlgorithm{
+	SHA1,
+	SHA224,
+	SHA256,
+	SHA384,
+	SHA512;
+	
+	public String getJavaName() {
+		return this.name();
+	}
+}
\ No newline at end of file
diff --git a/src/com/cringe_studios/cringe_authenticator_library/impl/HOTP.java b/src/com/cringe_studios/cringe_authenticator_library/impl/HOTP.java
new file mode 100644
index 0000000..e86813c
--- /dev/null
+++ b/src/com/cringe_studios/cringe_authenticator_library/impl/HOTP.java
@@ -0,0 +1,29 @@
+package com.cringe_studios.cringe_authenticator_library.impl;
+
+import javax.crypto.Mac;
+import javax.crypto.MacSpi;
+import javax.xml.crypto.dsig.spec.HMACParameterSpec;
+
+import com.cringe_studios.cringe_authenticator_library.OTP;
+
+//https://datatracker.ietf.org/doc/html/rfc4226
+public class HOTP implements OTP{
+
+	@Override
+	public long getNextDueTime() {
+		return 0;
+	}
+
+	@Override
+	public String getPin() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	@Override
+	public String updatePin() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+	
+}
diff --git a/src/com/cringe_studios/cringe_authenticator_library/impl/TOTP.java b/src/com/cringe_studios/cringe_authenticator_library/impl/TOTP.java
new file mode 100644
index 0000000..573a009
--- /dev/null
+++ b/src/com/cringe_studios/cringe_authenticator_library/impl/TOTP.java
@@ -0,0 +1,28 @@
+package com.cringe_studios.cringe_authenticator_library.impl;
+
+import com.cringe_studios.cringe_authenticator_library.OTP;
+import com.cringe_studios.cringe_authenticator_library.OTPType;
+
+//https://datatracker.ietf.org/doc/html/rfc6238
+public class TOTP implements OTP{
+
+	@Override
+	public long getNextDueTime() {
+		// TODO Auto-generated method stub
+		//return this.period System.time;
+		return 0;
+	}
+
+	@Override
+	public String getPin() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	@Override
+	public String updatePin() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+	
+}
\ No newline at end of file