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5812-DS01-R 数据表(PDF) 31 Page - Broadcom Corporation.

部件名 5812-DS01-R
功能描述  Security Processor
PDF  84 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  BOARDCOM [Broadcom Corporation.]
网页  http://www.broadcom.com
标志 BOARDCOM - Broadcom Corporation.

5812-DS01-R 数据表(HTML) 31 Page - Broadcom Corporation.

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Advance Data Sheet
BCM5812
3/11/03
B roa dcom Co rpo rat ion
Document
5812-DS01-405-R
Cryptographic Operations
Page 23
Figure 22: Pure MD5/SHA-1 Hash Command Context
The input structures are the same as for ARCFOUR, Figure 20 on page 21. The packet length must equal the total of the
input fragment lengths.
The hash output is written to the address in the next output fragment chained entry in the packet descriptor. The size of the
hash written is determined by the algorithm, 16 bytes for MD5 and 20 bytes for SHA-1. The output fragment length for this
descriptor must be zero.
IPSEC AES
The BCM5812 provides FIPS-197 [15] compliant AES. It supports the 128 bit blocksize, with key sizes of 128, 192, and 256
bits.
Figure 23 shows the AES command context. AES processing is very similarly to 3DES, with the following differences:
•
the block size is always 128 bits, as is the IV
•
the key can be 128, 192, or 256 bits
•
counter mode (CTR) is supported in addition to CBC.
The AES command context flags are detailed in Table 9 on page 24. The command context size depends on the AES key
size, as shown in Table 8. This command uses MCR1@. The opcode for this command is 0x40.
Table 7: Pure MD5/SHA-1 Hash Command Context Flags
Bits
Definition
15:14
Reserved
13:12
Authentication:
• 00 = Invalid
• 01 = MD5
• 10 = SHA-1
• 11 = Invalid
11:0
Reserved
0
LE N G T H
31
Pure M D 5/SH A-1 H ash C ontext
O P CO DE
RE S E RV E D
R ESE R VED
FLAG S
15 14 13 12
Reserved
0
flag s
0
LE N G T H
31
Pure M D 5/SH A-1 H ash C ontext
O P CO DE
RE S E RV E D
R ESE R VED
FLAG S
15 14 13 12
Reserved
0
flag s



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