Magtek mDynamo Programmer's Manual page 52

7 - Commands
Changes to fixed key settings are effective immediately and persist after a power cycle or reset.
Table 7-15 - Request Data for Command 0x4E - Load Fixed Key (Fixed Key Only)
Offset Field Name
0 Key Data Type
1..10 Key Serial Number
11..26 Key Data
27 Authentication Required
Table 7-16 - Response Data for Command 0x4E - Load Fixed Key (Fixed Key Only)
Offset Field Name
0..9 Key Serial Number
10..12 Key Check Value (KCV)
13 Authentication Required
Result codes:
0x00 = Success
0x01 = Failure
0x02 = Bad Parameter
Example Request (Hex)
Cmd Num
4E
mDynamo| OEM Secure Card Reader Authenticator | Programmer's Manual (COMMANDS)
0 = Encrypted Fixed Key
1 = Clear Component 1. The Key Data field contains component 1
of the new fixed key in the clear.
2 = Clear Component 2. The Key Data field contains component 2
of the new fixed key in the clear. If sent successfully, the device
XORs the components to form the new fixed key.
10 byte Key Serial Number (KSN)
The device ignores this field when the key data type field is set to
1 (Clear Component 1), because the host also sends this field for
Clear Component 2.
16 byte key data, formatted as defined in the Key Data Type field.
0x00 = Authentication not required the next fixed key load
0x01 = Authentication required for the next fixed key load
The device ignores this field when the key data type field is set to
1 (Clear Component 1), because the host also sends this field for
Clear Component 2.
See this field's description in the request data.
The KCV can be used to help identify/validate what key is
loaded. It contains the first 3 bytes of the result of encrypting an
8 byte field of zeroes with the current fixed key.
See this field's description in the request data.
Data Len
00 0102030405060708090A
8CA64DE9C1B123A78CA64DE9C1B123A7 00
1C
(New key of all zeroes is encrypted under the current key
of all zeroes)
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