User's Manual

PIN Pad 791 Programmer’s Manual (PCI POS-A) UDN PM0103-U Rev. 06
Section 5 – Administration and maintenance messages 2015-04-20
Page34
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Message 04 Check Master Key
Format: <SI>04[key ID][Key Info Query]<SO>[LRC]
Message length: Variable (6 or 7) bytes.
Usage: Host sends this message to PIN Pad for checking if the master key with an ID of [key
ID] has been loaded or not. Message 04 should be used before loading any master
key. Message 04 can be also used to query key information (key
usage/mode/algorithm) if the designated key is not empty.
Message element:
Request frame (HOST to PIN Pad)
Field Length Value and description
<SI> 1 <0F>
04 2 Message ID
[key ID] 1 Master key ID (0~9, A~G)
[Key Info Query] 1 <Option>, 1: query key information
<SO> 1 <0E>
[LRC] 1 Checksum
Response frame (PIN Pad to HOST)
Field Length Value and description
<SI> 1 <0F>
04 2 Message ID
[response code] 1 0 Master key not loaded
F Master key loaded
[Key usage] 2 <Option, if key info query filed is set>
“K0”: Key encrypting key. (Master key
for PIN / MAC / Data key)
“P0”: PIN key
“D0”: Data key
“M1”: MAC key for MAC algorithm 1
“M3”: MAC key for MAC algorithm 3
<FS> 1 <Option, if key info query filed is set>
<1C>, filed separator
[Mode] 2 <Option, if key info query filed is set>
“E”: Encryption use
“D”: Decryption use
<FS> 1 <Option, if key info query filed is set>
<1C>, filed separator
[Algorithm] 2 <Option, if key info query filed is set>