5812-DS01-R datasheet(29/84 Pages) BOARDCOM

29 / 84 page

Advance Data Sheet

BCM5812

3/11/03

B roa dcom Co rpo rat ion

Document

5812-DS01-405-R

Cryptographic Operations

Page 21

In null data mode, the input fragment chain entry in the packet descriptor and any chained elements are ignored. Only the

output fragment chained entry values are used. The number of keystream bytes generated is the packet length, which must

equal the total of the output fragment lengths.

For normal encipherment, the packet length, total of the input fragment lengths, and total of the output fragment lengths must

be equal.

Figure 20: ARCFOUR Packet Description Showing Input Fragments

COMMAND CONTEXT ADDRESS

NEXT INPUT FRAGMENT CHAIN ENTRY

RESERVED

INPUT FRAGMENT LENGTH

INPUT FRAGMENT ADDRESS

PACKET LENGTH

RESERVED

NEXT OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

OUTPUT FRAGMENT LENGTH

OUTPUT FRAGMENT ADDRESS

NEXT INPUT FRAGMENT CHAIN ENTRY

RESERVED

INPUT FRAGMENT LENGTH

INPUT FRAGMENT ADDRESS

NEXT INPUT FRAGMENT CHAIN ENTRY

RESERVED

INPUT FRAGMENT LENGTH

INPUT FRAGMENT ADDRESS

Fragment 1

Length

Fragment 2

Length

Fragment N

Length

Gathered Input Packet

(Network Byte Order)

Input Fragment Chain

Input Fragments Can Be

Arbitrary Byte Aligned

Packet Descriptor

COMMAND CONTEXT ADDRESS

NEXT INPUT FRAGMENT CHAIN ENTRY

RESERVED

INPUT FRAGMENT LENGTH

INPUT FRAGMENT ADDRESS

PACKET LENGTH

RESERVED

NEXT OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

OUTPUT FRAGMENT LENGTH

OUTPUT FRAGMENT ADDRESS

NEXT INPUT FRAGMENT CHAIN ENTRY

RESERVED

INPUT FRAGMENT LENGTH

INPUT FRAGMENT ADDRESS

NEXT INPUT FRAGMENT CHAIN ENTRY

RESERVED

INPUT FRAGMENT LENGTH

INPUT FRAGMENT ADDRESS

Fragment 1

Length

Fragment 2

Length

Fragment N

Length

Gathered Input Packet

(Network Byte Order)

Input Fragment Chain

Input Fragments Can Be

Arbitrary Byte Aligned

COMMAND CONTEXT ADDRESS

NEXT INPUT FRAGMENT CHAIN ENTRY

RESERVED

INPUT FRAGMENT LENGTH

INPUT FRAGMENT ADDRESS

PACKET LENGTH

RESERVED

NEXT OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

OUTPUT FRAGMENT LENGTH

OUTPUT FRAGMENT ADDRESS

NEXT INPUT FRAGMENT CHAIN ENTRY

RESERVED

INPUT FRAGMENT LENGTH

INPUT FRAGMENT ADDRESS

NEXT INPUT FRAGMENT CHAIN ENTRY

RESERVED

INPUT FRAGMENT LENGTH

INPUT FRAGMENT ADDRESS

Fragment 1

Length

Fragment 2

Length

Fragment N

Length

Gathered Input Packet

(Network Byte Order)

Input Fragment Chain

Input Fragments Can Be

Arbitrary Byte Aligned

Packet Descriptor

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