Packet 04 Communication Protocol; Packet 04 Key-Only Format - VeriFone MX800 series Programmer's Manual

IPP MS DUKPT C
AND OMMUNICATIONS
MS-Specific Packets
318
M X 800 S P
ERIES ROGRAMMERS
P
ACKETS

Packet 04 Communication Protocol

Packet 04 has two types of communication format: key-only and GISKE key block
format. The communication format depends on the IPP key management setting
and the length of the key at address [a]. The use of the communication protocol is
as follows:
IPP Key Management Setting
1DES mode
Mixed or 3DES mode
a. If a single-, double-, or triple-length key stored in the IPP contains the key attribute
information described in the GISKE specification, this indicates that master device must be
compatible with the IPP7 (3DES) specification. Therefore, the master device can
understand the GISKE key block format communication protocol.

Packet 04 Key-only Format

To check if the master key is loaded at address 5, the request sample packet 04
for key-only format is
<SI>045<SO>{LRC}
Table 58 Response Packet 04 Key-only Format
Data Element Characteristic
<SI> 1H
Packet Type 2AN
[r] 1AN
<SO> 1H
1H
{LRC}
G
UIDE
Key Length at
Address [a]
1DES (single-length
key)
3DES (single-, double-
, or triple-length key)
1DES (single-length
key)
3DES (single-, double-
, or triple-length key)
Comments
Shift In, Value: 0Fh
Value: 04
Response code:
0 = No master key at address [a]
•
F = Master key present at address [a]
•
Shift Out, Value: 0Eh
Error Check
Communication
Protocol Used
Key-only format (IPP5/
IPP6)
GISKE key block
a
format
GISKE key block format
GISKE key block format