5812-DS01-R datasheet(36/84 Pages) BOARDCOM

36 / 84 page

BCM5812

Advance Data Sheet

3/11/03

B roa dcom Co rpo rat ion

Page 28

Cryptographic Operations

Document

5812-DS01-405-R

Figure 25: Diffie-Hellman Public Key Generate

The generator and modulus parameter field sizes must match their respective number of bits, and the same parameter field

size must be used for both.

The BCM5812 outputs the public value as a BigNum to the first output fragment. This buffer must be the same length in

bytes as the modulus parameter field size increment in Table 10 on page 27. It must be 32-bit aligned and contiguous.

Output fragmentation is not used.

The secret value is always written to the second output fragment chain entry buffer address, whether supplied by software

or generated by the BCM5812. This buffer must be the same length in bytes as the exponent parameter field size increment

in Table 10. It must be 32-bit aligned and contiguous. Output fragmentation is not used.

Figure 26 on page 29 shows the command context, packet descriptor structure, input, and output for Diffie-Hellman secret

key derivation. This uses MCR2@, and Opcode 0x02.

LENGTH

OPCODE

EXPONENT LENGTH

MODULUS

64-256

Bytes

GENERATE SECRET

MODULUS LENGTH

GENERATOR LENGTH

GENERATOR

64-256

Bytes

Least Significant 32 bit “digit”

Most Significant 32 bit “digit”

COMMAND CONTEXT ADDRESS

NEXT INPUT FRAGMENT CHAIN ENTRY

RESERVED

INPUT FRAGMENT LENGTH

INPUT FRAGMENT ADDRESS

RESERVED

NEXT OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

OUTPUT BUFFER LENGTH

OUTPUT FRAGMENT ADDRESS

NEXT OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

FRAGMENT LENGTH

OUTPUT FRAGMENT ADDRESS

Input Secret

Output Public Value

Output Secret

Packet Descriptor

Command Context

BigNum Argument

If supplied by software

(Generate Secret == 0)

LENGTH

OPCODE

EXPONENT LENGTH

MODULUS

64-256

Bytes

GENERATE SECRET

MODULUS LENGTH

GENERATOR LENGTH

GENERATOR

64-256

Bytes

Least Significant 32 bit “digit”

Most Significant 32 bit “digit”

COMMAND CONTEXT ADDRESS

NEXT INPUT FRAGMENT CHAIN ENTRY

RESERVED

INPUT FRAGMENT LENGTH

INPUT FRAGMENT ADDRESS

RESERVED

NEXT OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

OUTPUT BUFFER LENGTH

OUTPUT FRAGMENT ADDRESS

NEXT OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

FRAGMENT LENGTH

OUTPUT FRAGMENT ADDRESS

NEXT OUTPUT FRAGMENT CHAIN ENTRY

RESERVED

FRAGMENT LENGTH

OUTPUT FRAGMENT ADDRESS

Input Secret

Output Public Value

Output Secret

Packet Descriptor

Command Context

BigNum Argument

If supplied by software

(Generate Secret == 0)

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