Data Sheet

Coupler - Reference manual
RM 21
Version 1.2
LOAD_KEY_FILE
Use
This function loads into the coupler’s security module a key to be used for authentication
and security purposes.
Key loading is a security sensitive operation. In order to protect the confidentiality of the
keys transferred to the coupler, data is encrypted. A 4-byte checksum is also sent in
order to guarantee the authenticity of the data, which could be corrupted either through
transmission errors or by a deliberate attempt to fraud the system.
Refer to «Coupler’s key loading» chapter for more information about security and the way
to calculate encrypted key and checksum.
Prototype
" Command sent : D8h
" Command type : ISO In
Host
80h D8h P1 P2 OCh Data
Coupler
D8h 90h 00h
Parameters
P1 : Parameter used for key operations
00: Load and activate the key pointed by P2.
01: Deactivate the key pointed by P2 (Forbidden option to Exchange Key Ke).
02: Delete the key pointed by P2 (Forbidden option to Exchange Key Ke).
Others value are reserved for future use.
Notes:
With the 00 option, this command will replace the old value of the key with the new value.
With the 01 and 02 options, the command has to be sent with 12-byte data at any value
(Data = XX XX XX XX XX XX XX XX XX XX XX XX).
When a key is deactivated, you need to reload it to reactivate the key.
P2 : Key number.
00h - Exchange Key Ke: used for key loading operation.
01h - Debit Key Kd0
02h - Credit Key Kc0
03h - Debit Key Kd1
04h - Credit Key Kc1
.....
0Fh - Debit Key Kd7
10h - Credit key Kc7
Data:
This field contains:
" the 8-byte encrypted master key
" the 4-byte checksum
Response: Status Words