5802-DS02-R datasheet(31/50 Pages) BOARDCOM

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Production Specification

■ BCM5802

07/03/02

B roa dcom Co rpo rat ion

Document

5802-DS03-405-R

Memory Structures

Page 23

Master Command Record. This structure is used to hand off a number of key setups to the chip for processing. The

structure is variable-length, and contains up to 216-1 sets of fields where each field describes one key setup. This degree of

flexibility allows the host CPU to queue up any number of key setups, and to initiate hardware processing of all queued up

key setup sessions via a single PCI write. When using the Diffie-Hellman algorithm to generate shared secrets, two key setup

operations must be performed. The first operation is to generate a public key to be sent to a party with whom the secret is

shared. The second operation is to generate the shared secret using the received public key from the party. Two sets of fields

are needed to complete the generation of a shared secret.

Table 8:

Master Command Record

MSB

LSB

98765

43210

Flags

# key setups in this MCR

Command context address for 1st key setup firstKeySetupCMDAddr

Data Buffer Address dataAddr for 1st key setup

Next entry in linked list of data buffers for 1st key setup next

Reserved

Data buf length dataLen 1st key setup

Length for 1st key setup data dLength

Reserved

Output Buffer Address dataAddr for 1st key setup

Next entry in linked list of Output buffers for 1st key setup next

Reserved

Output buf length dataLen 1st key setup

Command context address for 2nd to Nth key setup KeySetupCMDAddr

Data Buffer Address dataAddr for 2nd to Nth key setup

Next entry in linked list of data buffers for 2nd to Nth key setup next

Reserved

Data buf length dataLen 2-Nth key setup

Length for 2-Nth keysetup dLength

Reserved

Output Buffer Address dataAddr for 2-Nth key setup

Next entry in linked list of Output buffers for 2-Nth key setup next

Reserved

Output buf length dataLen 2-Nth key setup

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