5802-DS02-R datasheet(29/50 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 21

Packet Context Buffer. This structure defines IPsec crypto and authentication processing to be applied on a per packet

basis.

Table 6:

Packet Context Buffer

The crypto bit must be 0 for no crypto, or 1 for 3DES-CBC. DES modes are generated by setting three consecutive 3DES

keys to be equal.

The authentication value must be set as follows:

MSB

LSB

30 29

27 26

25 24

23 22

20 19

18 17

12 11

10 9

Crypto 3DES keying material, (24 bytes, high word of k1)

Crypto 3DES keying material (24 bytes, low word of k1)

Crypto 3DES keying material (high word of k2)

Crypto 3DES keying material (low word of k2)

Crypto 3DES keying material (high word of k3)

Crypto 3DES keying material (low word of k3)

HMAC Hash Inner state (high word) HMACInnerState

HMAC Hash Inner state

HMAC Hash Inner state (low word for MD5)

HMAC Hash Inner state (low word only for SHA1)

HMAC Hash Outer state (high word) HMACOuterState

HMAC Hash Outer state

HMAC Hash Outer state (low word for MD5)

HMAC Hash Outer state (low word only for SHA1)

3DES Computed IV (8 bytes, high word)

3DES Computed IV (8 bytes, low word)

Payload auth to Crypto offset cryptoOffset in 32-bit words

(2)

Reserved

No authentication

HMAC-MD5

HMAC-SHA1

Invalid

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