1.9.1 - November bugfix release

Release date: November 14th, 2023

Bug fixes:

• SCard handle contention. Previously, the SDK was opening all smart card handles with
  shared permissions, meaning that other applications and services were still able to interact
  with the YubiKey while the SDK performed smart card operations. However, this allowed these
  other entities (such as smart card minidrivers) to alter the current state of the YubiKey
  without the SDK's knowledge. This would sometimes cause random failures and exceptions to
  occur when using the SDK. The SDK now opens the handle exclusively, which means other
  applications will not be able to open the smart card handle for read and write operations
  while the SDK is using it. Callers should take care to not keep a YubiKey connection or
  session open longer than is needed.
• Config changes over FIDO2. The YubiKey Management commands are now available over all
  three logical USB interfaces (HID keyboard, HID FIDO, and smart card). The SDK will typically
  use the first available interface, giving some preference to the smart card. Previously,
  this operation would have failed on FIDO-only devices as the management commands were not
  properly wired up over this interface.

Miscellaneous:

• Dependency updates. The dependencies of the SDK were updated to the latest packages
  available. Since the SDK itself does not take many dependencies outside of the .NET Base
  Class Libraries (BCL), there should not be much of a noticeable impact. The two that
  affect the SDK itself (and not just test code) are:
  • Microsoft.Extensions.Logging.Abstractions (6.0.1 -> 7.0.1)
  • System.Memory (4.5.4 -> 4.5.5)