EncodeHmacSecretExtension Method

EncodeHmacSecretExtension(PinUvAuthProtocolBase)

Encode the "hmac-secret" extension. This call will be valid only if the RequestHmacSecretExtension(ReadOnlyMemory<Byte>, Nullable<ReadOnlyMemory<Byte>>) has been called, and the Encapsulate(CoseKey) method has been successfully called. The hmac-secret extension must be encoded before calling the GetAssertionCommand.

Note

If you use GetAssertions(GetAssertionParameters) to get any assertion, you do not need to call this method.

C#

public void EncodeHmacSecretExtension(PinUvAuthProtocolBase authProtocol)

Parameters

Type	Name	Description
PinUvAuthProtocolBase	authProtocol	An instance of one of the subclasses of PinUvAuthProtocolBase, for which the Encapsulate method has been called.

Exceptions

Type	Condition
System.ArgumentNullException	The authProtocol arg is null.
System.InvalidOperationException	The Encapsulate method for the authProtocol has not been called.

Remarks

If you want the hmac-secret extension value returned along with the assertion, then call the RequestHmacSecretExtension method with a salt. If you will be using the GetAssertionCommand to get the assertion, then you must call this method to encode the extension. The authProtocol you supply must be an object for which the Encapsulate(CoseKey) method has been called.

If the RequestHmacSecretExtension method has not been called, this method will do nothing. If it has been called, but the authProtocol has not been encapsulated, this method will throw an exception.

The result of this method is stored inside this object. If there is already an encoded hmac-secret extension in the object, this method will build a new one and replace the old one. This might be necessary if a new authenticator public key is retrieved since the last time this method has been called.

See also the documentation for the RequestHmacSecretExtension(ReadOnlyMemory<Byte>, Nullable<ReadOnlyMemory<Byte>>) method, which also includes some code samples.