5812-DS00-R datasheet(30/84 Pages) BOARDCOM

30 / 84 page

BCM5812

Advance Data Sheet

3/11/03

B roa dcom Co rpo rat ion

Page 22

Cryptographic Operations

Document

5812-DS01-405-R

Figure 21: ARCFOUR Packet Description Showing Output Fragments

PURE MD5/SHA-1 HASH

The BCM5812 includes basic MD5 and SHA-1 hash operations. These are useful for various protocol processing functions,

such as for computing SSL and TLS finished messages.

Figure 22 shows the command context for Pure MD5/SHA-1 Hash. The flags word authentication value is shown in Table 7.

This command context length should be programmed to 8, even though the BCM5812 always reads 64 bytes.

This command uses MCR1@. The opcode for this command is 0x05.

Note

•

The default byte order for ARCFOUR input and output fragment data is the same as the byte order

on a little endian host processor system.

•

The default ARCFOUR state in the Command Context is byte swapped relative to the input and

output fragment data.

•

The ARCFOUR continuation state is output in the same byte order as the Command Context.

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 OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

OUTPUT FRAGMENT LENGTH

OUPUT FRAGMENT ADDRESS

NEXT OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

OUTPUT FRAGMENT LENGTH

OUTPUT FRAGMENT ADDRESS

Fragment 1

Length

Fragment 2

Length

Fragment N

Length

Scattered Output Packet

(Network Byte Order)

NEXT OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

LENGTH (NOT USED)

OUPUT FRAGMENT ADDRESS

ARCFOUR

State

Output Fragment Chain

Output Fragments Must Be

32-bit Word Aligned

Index i

Index j

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 OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

OUTPUT FRAGMENT LENGTH

OUPUT FRAGMENT ADDRESS

NEXT OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

OUTPUT FRAGMENT LENGTH

OUTPUT FRAGMENT ADDRESS

Fragment 1

Length

Fragment 2

Length

Fragment N

Length

Scattered Output Packet

(Network Byte Order)

NEXT OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

LENGTH (NOT USED)

OUPUT FRAGMENT ADDRESS

ARCFOUR

State

Output Fragment Chain

Output Fragments Must Be

32-bit Word Aligned

Index i

Index j

Packet Descriptor

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