The YubiKey challenge-response operation can be demonstrated using the NIST PUB 198 A.2 test vector.
First, program a YubiKey with the test vector :
$ ykpersonalize -2 -ochal-resp -ochal-hmac -ohmac-lt64 -a 303132333435363738393a3b3c3d3e3f40414243
...
Commit? (y/n) [n]: y
$
However, when a user actually executes
$ ykpersonalize -2 -ochal-resp -ochal-hmac -ohmac-lt64 -a 303132333435363738393a3b3c3d3e3f40414243
then instead of an ellipsis (as in the example quoted above), they are presented with a prompt asking for input:
HMAC key, 20 bytes (40 characters hex) :
What is the user expected to enter here, in order to progress towards successfully demonstrating the YubiKey challenge-response operation using the NIST PUB 198 A.2 test vector? Simply pressing the Enter key results in an error:
Yubikey personalization error: invalid option/argument value
The documentation here says:
However, when a user actually executes
then instead of an ellipsis (as in the example quoted above), they are presented with a prompt asking for input:
What is the user expected to enter here, in order to progress towards successfully demonstrating the YubiKey challenge-response operation using the NIST PUB 198 A.2 test vector? Simply pressing the Enter key results in an error: