43.5.2.1 Message Digest Example

Considering the following 512 bits message (example given in FIPS 180-4):

“61626380000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000018”

The message is written to memory in a Little Endian (LE) system architecture.


Memory Address	Address Offset / Byte Lane
Memory Address	0x3 / 31:24	0x2 / 23:16	0x1 / 15:8	0x0 / 7:0
0x000	80	63	62	61
0x004–0x038	00	00	00	00
0x03C	18	00	00	00

The digest is stored at the memory location pointed at by the ICM_HASH pointer with a Region Offset.


Memory Address	Address Offset / Byte Lane
Memory Address	0x3 / 31:24	0x2 / 23:16	0x1 / 15:8	0x0 / 7:0
0x000	36	3e	99	a9
0x004	6a	81	06	47
0x008	71	25	3e	ba
0x00C	6c	c2	50	78
0x010	9d	d8	d0	9c


Memory Address	Address Offset / Byte Lane
Memory Address	0x3 / 31:24	0x2 / 23:16	0x1 / 15:8	0x0 / 7:0
0x000	22	7d	09	23
0x004	22	d8	05	34
0x008	77	a4	42	86
0x00C	b3	55	a2	bd
0x010	e4	bc	ad	2a
0x014	f7	b3	a0	bd
0x018	a7	9d	6c	e3


Memory Address	Address Offset / Byte Lane
Memory Address	0x3 / 31:24	0x2 / 23:16	0x1 / 15:8	0x0 / 7:0
0x000	bf	16	78	ba
0x004	ea	cf	01	8f
0x008	de	40	41	41
0x00C	23	22	ae	5d
0x010	a3	61	03	b0
0x014	9c	7a	17	96
0x018	61	ff	10	b4
0x01C	ad	15	00	f2

Considering the following 1024 bits message (example given in FIPS 180-4):

“6162638000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000000000000000000018”

The message is written to memory in a Little Endian (LE) system architecture.


Memory Address	Address Offset / Byte Lane
Memory Address	0x3 / 31:24	0x2 / 23:16	0x1 / 15:8	0x0 / 7:0
0x000	80	63	62	61
0x004–0x078	00	00	00	00
0x07C	18	00	00	00