MagTek Bluetooth MagneSafe V5 Swipe Reader - Manual (Page 51)

Section 5. Communications
43
Data structure:
Request Data:
Offset Field Name Description
0 PreAuthentication
Time Limit (msb) Most significant byte of the PreAuthentication Time
Limit.
1 PreAuthentication
Time Limit (lsb) Least significant byte of the PreAuthentication Time
Limit.
Response Data:
Offset Field Name Description
0 Current Key
Serial Number This eighty-bit field includes the Initial Key Serial
Number in the leftmost 59 bits and a value for the
Encryption Counter in the rightmost 21 bits.
10 Challenge 1 This eight byte challenge may be used later in an
Activation Challenge Reply command shown below,
and to authenticate the reader as mentioned above.
18 Challenge 2 This eight byte challenge may be used later in a
Deactivate Authenticated Mode command shown
below.
Result codes:
0x00 (Success)
0x03 (Redundant – the reader is already in this mode)
0x05 (Delayed – the request is refused due to anti-hacking mode)
0x07 (Sequence Error – the current Security Level is too low)
0x80 (Encryption Counter Expired)
Example Activate Authenticated Mode Request (Hex):
Cmd Num Data Len Data
10 00
Example Activate Authenticated Mode Response (Hex):
Result Code Data Len Data
00 20 FFFF 0123 4567 8000 0003 9845 A48B 7ED3
C294 7987 5FD4 03FA 8543
ACTIVATION CHALLENGE REPLY COMMAND
Command number: 0x11
Description: This command is used as the second part of an Activate Authentication
sequence. In this command, the application sends the first 6 bytes of
Challenge 1 (received in response to the Activate Authenticated Mode
command), two bytes of time information, and (optionally) an eight byte
Session ID encrypted with a variant of the current DUKPT PIN
Encryption Key (Key XOR 3C3C 3C3C 3C3C 3C3C 3C3C 3C3C 3C3C
3C3C).
The time information contains a count of the maximum number of seconds
the reader should remain in the Authenticated Mode. Regardless of the
value of this timer, a user card swipe in the Authenticated Mode ends the
Authenticated Mode. The maximum time allowed is 3600 seconds (one
hour). To get the full hour, use the value 0x0E10. To get the value of 3
minutes, use the value 0x012C. A value of zero forces the reader to stay