Verify a Watchword Response

Command:

Verify a Watchword response.

Notes:

The cipher scheme used depends upon the key length.

Single length WWK –   Cipher scheme code 0

Double length WWK –            Cipher scheme code 1

Triple length WWK –  Cipher scheme code 2

Field

Length & Type

Details

COMMAND MESSAGE

Message header

m A

(Subsequently returned to the Host unchanged).

Command code

2 A

Value FU.

WWK

16H or
1A+32H or 1A+48H

Watchword Key encrypted under LMK pair 22-23.

Flag

1 N

1 = response for PIN 1,

2 = response for PIN 2.

Challenge

7 N

Watchword challenge.

Response

7 N

Watchword response.

End message delimiter

1 C

Optional. Must be present if a message trailer is present. Value X’19.

Message trailer

n A

Optional. Maximum length 32 characters.

RESPONSE MESSAGE

Message header

n A

Returned to the Host unchanged.

Response code

2 A

Value FV.

Error code

2 N

00 : No errors

01 : Verification failure

10 : WWK parity error

12 : No keys loaded in user storage

13 : LMK error; report to supervisor

15 : Error in input data

21 : Invalid user storage index

End message delimiter

1 C

Present only if present in the command message. Value X’19.

Message trailer

n A

Present only if present in the command message. Maximum length 32 characters.