Command:

Generate the S₂ MAC for Linked Load, Declined Unlinked Load or Unload transactions.

Notes:

Field

Length & Type

Details

COMMAND MESSAGE

Message Header

m A

Will be returned to the Host unchanged

Command Code

2 A

Value “U8”

*KML

32 H or 1A+32H

Double length KML encrypted under LMK pair 20-21 variant 1

ID_CEP

6 B

The CEP Card Identifier. Used to create the *KDL

NT_CEP

2 B

The transaction number assigned by the Load Acquirer

Updates Length

2 N

Length in bytes of the UPDATES_ISS field

CC_ISS

2 B

Completion Code

TI

1 B

Transaction Indicator
‘0C’ for Linked Load or Declined Unlinked Load transactions
’0A’ for unload transactions

S₁

8B

Signature

BAL_ISS

4 B

Balance of card for this currency

BALmax_ISS

4 B

Maximum balance of the target slot

CALPHA_ISS

3 B

Alphanumeric currency code

UPDATES_ISS

0 - 24 B

Updates to CEP card data

End Message Delimiter

1 C

Optional. Must be present if a message trailer is present. Value X'19

Message Trailer

n A

Optional. Maximum length 32 characters

Field

Length & Type

Details

RESPONSE MESSAGE

Message Header

m A

Will be returned to the Host unchanged

Response Code

2 A

Value “U9”

Error Code

2 N

00 – No error.

10 – *KML parity error

12 – No keys loaded in user storage

13 – LMK error - report to Supervisor

15 – Error in input data

21 – Invalid user storage index

70 – Invalid transaction indicator

71 – Invalid Updates Length

S₂

8 B

Generated Signature

End Message Delimiter

1 C

Will only be present if present in the command message. Value X'19

Message Trailer

n A

Will only be present if in the command message. Maximum length 32 characters