Packet 18: Check Ipp7 Key Management Mode - VeriFone MX800 series Programmer's Manual

Packet 18: Check
IPP7 Key
Management Mode
Request Packet
Format
The combinations of KMM setting are limited, which means that the mixtures of
MS mode, zero key support, zero GISKE session key support, DUKPT mode, and
SM mode are not applicable in some cases. If there is a conflict in the KMM
setting, the following priority rules apply:
Priority KMM setting
1 MS/DUKPT mode vs. SM mode
2 MS mode vs. zero key support
3 MS mode vs. zero GISKE
session key support
Checks the setting in the IPP7 key management options register.
<SI>18<SO>{LRC}
Table 45 Packet 18 Format
Data Elements
<SI>
Packet Type
IPP MS
Notes
If bit 1 and bit 0 of the KMM register is set
to "ONE," the IPP switches to SM mode,
regardless how the other bits are set.
Zero key support is not applicable in
3DES MS mode, due to the key usage
rule (that is, single-length key use is not
allowed in 1DES MS mode).
The IPP stores the setting, but it has no
affect on the MS function.
Zero GISKE session key support is not
applicable in 1DES MS mode, due to the
key usage rule (triple-length key use is
not allowed in 3DES MS mode).
The IPP stores the setting, but it has no
affect on the MS function.
Characteristics Comments
1H Shift In, value: 0Fh
2AN Value: 18
DUKPT C
AND OMMUNICATIONS
Common Packets
X
M 800 S P
ERIES ROGRAMMERS
P
ACKETS
305
G
UIDE