5802-DS02-R datasheet(12/50 Pages) BOARDCOM

12 / 50 page

■ BCM5802

Production Specification

07/03/02

B roa dcom Co rpo rat ion

Page 4

Processing Overview

Document

5802-DS03-405-R

The following figure illustrates a high-level view of the BCM5802 packet processing.

The BCM5802 provides SSL/TLS key exchange using RSA in the following stages:

Fetch command context, including keys and message through DMA.

If the required operation is private key decryption, use the private key RSA algorithm with pre-computed components

generated using the Chinese Remainder Theorem.

If the required operation is public key encryption, use the public RSA algorithm.

Write the decrypted/encrypted message to the output buffer.

The BCM5802 generates keys using the Diffie-Hellman algorithm for IKE handshake in the following stages:

Fetch command context and message through DMA.

If the required operation is to generate a message to another party (gx mod n), generate a random number from the

random number generator unit on the chip and then perform the modular exponentiation with the generated random

number as the exponent on the chip.

If the required operation is to generate the shared key from the message received (Yx mod n), perform the modular

exponentiation with a previously generated random number on the chip. The random number is a part of the command

context through DMA.

Write the output including the generated random number to the output buffer.

Note

Multiple sets of input packets can be specified via a single command descriptor (single PCI write).

Figure 1:

Packet Processing Overview

Packet

Context

Header

Payload

BCM5802

Security

Processor

BCM5802

Security

Processor

Header

Payload

HMAC

Codes

Status

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