5802-DS00-R datasheet(39/50 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 31

The following table shows the data chaining in the MCR structure for various key setup algorithms. Symbol A

B is used

to represent that the next field in data buffer A points to the data buffer for B.

Table 23:

MCR Input/Output Data Buffer Chaining

Algorithms

Input Data Chaining

Output Data Chaining

DH Send

Private Key x Provided by SW. If the private

key is generated by RNG, no input data is

needed. Input data buffer length is zero.

Public Key data buffer

Private Key

data buffer

DH Receive

Public Key data buffer

Private Key data

buffer . The SW driver must keep track of the

corresponding private keys to generate the

shared secret.

Shared secret buffer

RSA Public Key

Message data buffer

RSA Private Key

Message data buffer

DSA Signing

m data buffer

Random number k

Provided by SW. If k is generated by RNG,

only message data is stored in the input data

buffer.

The M data buffer can contain multiple

fragments. In this case, random number k

provided by software follows the last fragment

of m data buffer. The dlength field of the key

setup is the total length (in bytes) of m data

buffer (does not include the random number k).

However, the fragments other than the last one

must be integer multiple of 512 bits. The last

fragment can be in any length.

r parameter data buffer

s parameter

data buffer

DSA Verification

m data buffer

r parameter data buffer

s parameter data buffer. The M data buffer

can contain multiple fragments. In this case, r

parameter data buffer follows the last fragment

of m data buffer. The dlength field of the key

setup is the total length (in bytes) of m data

buffer (does not include r and s parameter data

buffers). However, the fragments other than

the last one must be integer multiple of 512

bits. The last fragment can be in any length.

v parameter buffer

RNG Bypass Mode

None

Random number buffer

RNG SHA1

Randomized Mode

None

Random number buffer

ModAdd ((A+B) mod N)

A data buffer

B data buffer

Output data buffer

ModSub ((A-B) mod N)

A data buffer

B data buffer

Output data buffer

ModMul (A*B mod N)

A data buffer

B data buffer

Output data buffer

ModRem

(A mod N)

A data buffer

Output data buffer

ModExp

(AE mod N)

A data buffer

E data buffer

Output data buffer

ModInv

(A-1 mod N)

A data buffer

Output data buffer

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