Message Digest Example

Considering the following 512-bit message (example given in FIPS 180-2):

“61626380000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000018”

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

Table 1. 512 bits Message Memory Mapping
Memory Address Address Offset / Byte Lane
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.

Table 2. LE Resulting SHA-160 Message Digest Memory Mapping
Memory Address Address Offset / Byte Lane
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
Table 3. Resulting SHA-224 Message Digest Memory Mapping
Memory Address Address Offset / Byte Lane
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
Table 4. Resulting SHA-256 Message Digest Memory Mapping
Memory Address Address Offset / Byte Lane
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-bit message (example given in FIPS 180-2):

“6162638000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000018”

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

Table 5. 1024 bits Message Memory Mapping
Memory Address Address Offset / Byte Lane
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
Parent topic: ICM Hash Area