Key-Only Format - VeriFone MX800 series Programmer's Manual

Sample Packet 02 in

Key-only Format

Key-only Format
The key attribute information is not available when the key is loaded using the
key-only format (as compared to the GISKE communication protocol). The IPP
sets the default attributes to the key, as shown in
Table 53 Default Key Attributes
Key Attributes Value
Key usage AN
Key Algorithm D
Key mode of use N
Key version 00
Key length 1
The single-DES communication protocol between the master device and the IPP
as follows:
This sample packet requests the IPP to load master key 0123456789ABCDEF
into location '0'.
<SI>0200123456789ABCDEF<SO>{LRC}
Table 54 Packet 02 Key-Only Communication Protocol
Master Device
<SI>02[n][hhhhhhhhhhhhh-
hhh]<SO>{LRC}
ACK if LRC and key echo
•
are okay
NAK if LRC incorrect
•
EOT after 3 NAKs
•
EOT if LRC correct, but key
•
echo incorrect
IPP MS
AND
Table
Hex Definition
0x41, 0x4E Any; no special restrictions
0x44 DES
0x4E No special restrictions
0x30, 0x30 version = zero
0x31 single-length key
Transmit
IPP
Direction
ACK if LRC
•
NAK if LRC incorrect
•
EOT after 3 NAKs
•
<SI>02[n][hhhhhhhhhhhhhhhh]<SO>{LRC}
IPP saves the new master key only
•
on receipt of ACK
EOT terminates session
•
X
M 800 S
DUKPT C
OMMUNICATIONS
MS-Specific Packets
53.
P G
ERIES ROGRAMMERS UIDE
P
ACKETS
315