Local Master Key Variants

Variants of the Local Master Key in the HSM are used for encryption of defined keys or key components. These variants are calculated as follows:

1. Select the appropriate LMK pair, for example:

0123 4567 89AB CDEF 3131 3131 3131 3131.

2. Identify which Variant of the LMK is required and select the appropriate offset value:

Variant 2: 5A.

3. Exclusive-OR add the selected offset to the first byte of the LMK pair (01 in the example above).

4. Replace the left-most byte of the LMK pair with the result of Step 3 and use the resulting key as the specified Variant:

Variant 2 = 5B23 4567 89AB CDEF 3131 3131 3131 3131.

The variants are:

Variant 1 : A6

Variant 2 : 5A

Variant 3 : 6A

Variant 4 : DE

Variant 5 : 2B

Variant 6 : 50

Variant 7 : 74

Variant 8 : 9C

Variant 9 : FA

When the Variants are applied to the standard test LMK set, the left-most bytes of the sets are as follows:

LMK Pair	First byte of LMK
LMK Pair	1	2	3	4	5	6	7		8
00-01	A7	5B	6B	DF	2A	51	75	9D	FB
02-03	86	7A	4A	FE	0B	70	54	BC	DA
04-05	E6	1A	2A	9E	6B	10	34	DC	BA
06-07	C7	3B	0B	BF	4A	31	15	FD	9B
08-09	26	DA	EA	5E	AB	D0	F4	1C	7A
10-11	07	FB	CB	7F	8A	F1	D5	3D	5B
12-13	67	9B	AB	1F	EA	91	B5	5D	3B
14-15	46	BA	8A	3E	CB	B0	94	7C	1A
16-17	BA	46	76	C2	37	4C	68	80	E6
18-19	A7	5B	6B	DF	2A	51	75	9D	FB
20-21	A4	58	68	DC	29	52	76	9E	F8
22-23	A1	5D	6D	D9	2C	57	73	9B	FD
24-25	B5	49	79	CD	38	43	67	8F	E9
26-27	B0	4C	7C	C8	3D	46	62	8A	EC
28-29	BC	40	70	C4	31	4A	6E	86	E0
30-31	85	79	49	FD	08	73	57	BF	D9
32-33	80	7C	4C	F8	0D	76	52	BA	DC
34-35	8C	70	40	F4	01	7A	5E	B6	D0
36-37	89	75	45	F1	04	7F	5B	B3	D5
38-39	A7	5B	6B	DF	2A	51	75	9D	FB