OtpSession Class

Namespace: Yubico.YubiKey.Otp Assembly: Yubico.YubiKey.dll

Entry point for all high-level OTP operations.

C#
public sealed class OtpSession : ApplicationSession, IOtpSession
Inheritance object ApplicationSession OtpSession
Implements

Remarks

Most methods will return a reference to the operation class that performs the operation being executed. Then, methods on that class that configure the operation also return the same reference. This is known as a fluent builder pattern. This allows operations to be built by stringing together configuration methods. The operation is usually concluded with a call to a method named Execute().

Methods in this class that instantiate classes that support the fluent builder pattern are any that return a class reference. Methods that return void do not require additional configuration to perform their operations. See the example section below for more details.

Examples

This is an example of using the fluent builder pattern to configure a YubiKey OTP slot to emit a static password.

ReadOnlyMemory<char> password = "Shhhh!Don'tTell!".ToCharArray();
using (OtpSession otp = new OtpSession(yubiKey))
{
    otp.ConfigureStaticPassword(Slot.ShortPress)
        .SetPassword(password)
        .WithKeyboard(KeyboardLayout.en_US)
        .AppendCarriageReturn()
        .Execute();
};

The method, ConfigureStaticPassword(Slot), instantiates an instance of the class ConfigureStaticPassword. The next line configures the operation with the password to set. The next line configures the keyboard layout. The next line configures the operation to tell the YubiKey to send a carriage-return after sending the password, and finally, Execute() tells the operation class to perform the configuration on the YubiKey.

Constructors

Name Description
OtpSession(IYubiKeyDevice, ScpKeyParameters?)

Constructs a OtpSession instance for high-level OTP operations.

Properties

Name Description
IsLongPressConfigured

Indicates that the long-press configuration (slot 2) is present and valid.
IsShortPressConfigured

Indicates that the short-press configuration (slot 1) is present and valid.
LongPressRequiresTouch

Indicates that the long-press configuration (slot 2) requires touch for operation.
ShortPressRequiresTouch

Indicates that the short-press configuration (slot 1) requires touch for operation.

Methods

Name Description
CalculateChallengeResponse(Slot)

Submits a challenge to the YubiKey OTP application to be calculated.
ConfigureChallengeResponse(Slot)

Configures one of the OTP application slots to respond to challenges.
ConfigureHotp(Slot)

Configures a YubiKey OTP slot to emit sequence-based OTP codes.
ConfigureNdef(Slot)

Configures a YubiKey's NDEF slot for text or URI.
ConfigureStaticPassword(Slot)

Sets a static password for an OTP application slot on a YubiKey.
ConfigureYubicoOtp(Slot)

Configures one of the OTP application slots to act as a Yubico OTP device.
DeleteSlot(Slot)

Removes an OTP slot configuration and sets it to empty.
DeleteSlotConfiguration(Slot)

Removes a slot configuration in the YubiKey's OTP application.
ReadNdefTag()

Reads the OTP programmed in the short-press slot using the NFC Data-Exchange Format (NDEF) tag from NFC enabled YubiKeys. (Requires the YubiKey be connected via NFC).
SwapSlots()

Swaps the configurations in the short and long press slots.
UpdateSlot(Slot)

Updates the settings of an OTP application slot on a YubiKey without removing the existing configuration.