5802-DS02-R datasheet(32/50 Pages) BOARDCOM

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■ BCM5802

Production Specification

07/03/02

B roa dcom Co rpo rat ion

Page 24 Memory Structures

Document

5802-DS03-405-R

Context Buffer. This structure defines DH/RSA/DSA processing to be applied on a per key setup basis.

Table 9:

Diffie-Hellman Public Key Generation (X = gx mod N) Command Context

Table 10:

Diffie-Hellman Shared Secret Generation (K=Yx mod N) Command Context

MSB

LSB

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15

14 13 12 11 10 9

Operation Type

Diffie-Hellman Public Key Operation

(0x01)

Total Command Context Structure Length

Random Number x Length

x provided by SW/x generated by RNG

Modulus N Length

Base g Length

Modulus N (512, 768, 1024 bits, lowest word)

Modulus N (512, 768, 1024 bits, 2nd lowest word)

……

Modulus N (512, 768, 1024 bits, highest word)

Base g (512, 768, 1024 bits, lowest word of key)

Base g (512, 768, 1024 bits, 2nd lowest word of key)

……

Base g (512, 768, 1024 bits, highest word of key)

MSB

LSB

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15

14 13 12 11 10 9

Operation Type

Diffie-Hellman Shared Secret

Generation Operation (0x02)

Total Command Context Structure Length

Modulus N Length

Exponent (private key) x Length

Modulus N (512, 768, 1024 bits, lowest word)

Modulus N (512, 768, 1024 bits, 2nd lowest word)

……

Modulus N (512, 768, 1024 bits, highest word)

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