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5812-DS01-R 数据表(PDF) 28 Page - Broadcom Corporation.

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

5812-DS01-R 数据表(HTML) 28 Page - Broadcom Corporation.

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BCM5812
Advance Data Sheet
3/11/03
B roa dcom Co rpo rat ion
Page 20
Cryptographic Operations
Document
5812-DS01-405-R
Figure 19: ARCFOUR Command Context
Figure 20 shows how the input packet fragment list is used. Figure 21 on page 22 shows the corresponding output packet
fragment list usage.
If indicated by the command context flags, the ARCFOUR state at the end of this keystream generation or encipherment
operation is written to a fixed-size, 260-byte buffer starting at the output fragment address in the last output fragment chain
entry. This can be input directly in the command context of a subsequent ARCFOUR operation to continue the keystream.
Table 6: ARCFOUR Command Context Flags
Bits
Definition
15:13
Reserved
12
Null Data:
• 0 = Normal data encipherment
• 1 = No input data, just output raw keystream
11
Writeback:
• 0 = Don’t write back state, used for last encipherment operation in a keystream.
• 1 = Write back internal state after encipherment.
10
State/Key:
• 0 = Context contains continuation ARCFOUR state for keystream
• 1 = Context contains ARCFOUR key input, perform ARCFOUR state initialization first.
9:0
Reserved
0
LENGTH
31
OPCODE
ARCFOURSTATE
RESERVED
RESERVED
FLAGS
256Bytes
1312 11109
Reserved
0
flags
15
Reserved
Index i
Reserved
Index j
BYTE2
BYTE 3
BYTE0
BYTE 1
BYTE6
BYTE 7
BYTE4
BYTE 5
BYTE10
BYTE 11
BYTE8
BYTE 9
BYTE250
BYTE 251
BYTE248
BYTE 249
BYTE254
BYTE 255
BYTE252
BYTE 253
31
0
8
16
24
0
LENGTH
31
OPCODE
ARCFOURSTATE
RESERVED
RESERVED
FLAGS
256Bytes
1312 11109
Reserved
0
flags
15
Reserved
Index i
Reserved
Index j
BYTE2
BYTE 3
BYTE0
BYTE 1
BYTE6
BYTE 7
BYTE4
BYTE 5
BYTE10
BYTE 11
BYTE8
BYTE 9
BYTE250
BYTE 251
BYTE248
BYTE 249
BYTE254
BYTE 255
BYTE252
BYTE 253
31
0
8
16
24



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