User guide

ACR83 – Reference Manual [e-mail]
Version 1.05
www.acs.com.hk
Page 38 of 49
Command Header
OffsetOld SpePINLen
APDU Header
APDU
Lc
OffsetOld
Offset SpePINPos = 2 bytes Old PIN
00 24 00 01 12 Offset
Offset
(1 Byte)
SpePINSize
(4 bits)
Not used field Old PIN
00 24 00 01 12 1 byte 0A Input 6 digits 0110 Old PIN
00 24 00 01 12 2F 0A 0110 (bits) 0110 Old PIN
00 24 00 01 12 2F 0A
66 replace
A6
0110 Old PIN
OffsetNew SpePINLen
OffsetNew
Offset SpePINPos 8 bits = 1 byte New PIN
Offset
Offset (1
Byte)
SpePINSize (4 bits)
Not used
field
New PIN
0A bytes FB Input 10 digits 0111 New PIN
relative to Lc FB 1010 (bits) 0111 New PIN
2E FB 1010 (1010 replace original C7) 0111 New PIN
First, handle the Old PIN.
Old PIN (Byte)
Original
00 24 00 01 12 2F 0A A6 30 30 30 30 30 30 2E FB C7 30 30
30 30 30 30
Input 12 34 56
Result PIN
00 24 00 01 12 2F 0A 66 12 34 56 30 30 30 2E FB C7 30 30
30 30 30 30
And then handle the New PIN.
New PIN (Byte)
Original
00 24 00 01 12 2F 0A 66 12 34 56 30 30 30 2E FB C7 30 30
30 30 30 30
Input 12 34 56 78 90
Result PIN
00 24 00 01 12 2F 0A 66 12 34 56 30 30 30 2E FB A7 12 34
56 78 90 30
The whole APDU after the format will be:
00 24 00 01 12 2F 0A 66 12 34 56 30 30 30 2E FB A7 12 34 56 78 90 30h