GenDig - Shared Nonce

In Shared Nonce mode 32 bytes of data are input to this command. This mode is used when a nonce value must be shared between two devices. The Nonce command must be run prior to the first GenDig command to load a value into TempKey. Subsequent GenDig commands will use the value from the previous GenDig operation.

Table 1. Input Parameters GenDig Shared Nonce
Opcode (1 Byte)	Mode (1 Byte)	KeyID⁽¹⁾ (2 Bytes)	Data (32 Bytes)	Description
0x15	0x03	0x00 0[Slot]	Input data
0x15		0x80 0[Slot]	Input data

Note:

1.KeyId specifies the DataZone slot to be used in the TempKey calculation. Only the lowest 32 bytes will be used.

Table 2. Output Response - GenDig Data
Name	Size	Description
Response	1 byte	0x00 - If successful. Error code - If the command fails.

Notes: Flag Bits

1.TempKey.Valid flag will be set to 1 if successful, otherwise it is 0.
2.TempKey.GenDigData will be set to 1 indicating a DataZone slot was used in the calculation.
3.TempKey.KeyID will set to the slot specified in the command.

Table 3. TempKey Calculation - GenDig Shared Nonce
Size	Parameters - KeyID MSB 0x00	Parameters - KeyID MSB 0x80
32 bytes	Input Data	TempKey.value
1 byte	Opcode = 0x15	Opcode = 0x15
1 byte	Mode = 0x03	Mode = 0x03
1 byte	LSB of KeyID = 0x0[Slot]	LSB of KeyID = 0x0[Slot]
1 byte	0x00	0x00
1 byte	SN[8] = 0x01	SN[8] = 0x01
2 bytes	SN[0:1] = 0x01 0x23	SN[0:1] = 0x01 0x23
25 bytes	All Zeros	All Zeros
32 bytes	TempKey.Value	Input Data