C# Класс Microsoft.IdentityModel.Swt.SwtSecurityKeyClause
The SwtSecurityTokenHandler passes an instance of this clause to the SwtIssuerTokenResolver so that it knows it's an SWT that has already been verified against the SwtIssuerNameRegistry trusted issuers list.
Because we only support one symmetric SecurityKey for SWT, we don't need to differentiate between issuers.