Omit zero LC when sending an extended length cAPDU

google / u2f-ref-code

U2F reference implementations

BSD 3-Clause "New" or "Revised" License

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Omit zero LC when sending an extended length cAPDU #179

Closed fmeum closed 5 years ago

fmeum commented 5 years ago

The specification of the Extended Length format for cAPDUs mandates that the bytes encoding LC are to be omitted if LC=0. This change fixes the behavior of xchgAPDUExtended in this regard.