5812-DS01-R datasheet(43/84 Pages) BOARDCOM

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Advance Data Sheet

BCM5812

3/11/03

B roa dcom Co rpo rat ion

Document

5812-DS01-405-R

Cryptographic Operations

Page 35

Figure 31: Random Number Generation Command Context

MODULAR ARITHMETIC

The BCM5812 provides basic, large integer modular arithmetic functions for add, subtract, multiply, remainder, and

exponentiation. These commands all use MCR2@, and the opcodes listed in Table 13 on page 41. With the exception of

remainder, all arguments must be less than the modulus. The BCM5812 does not reduce arguments prior to performing the

operation.

Figure 32 shows the command context, input, and output structures for computing (A+B) mod N, for N up to 2048 bits. All

input and output values must be supplied in a single buffer fragment. The modulus length, in bits, is supplied in the command

context. All fragments must be the same size, which must be one of the parameter sizes in Table 13.

LE NG T H

O PCODE

C O M M AND CO NT EX T ADDR ES S

N EX T IN PUT F RAG M ENT CH AIN E NT R Y

RE SER VE D

INP UT FR AG M E NT LEN GT H

INP UT FR AG M E NT AD DRE SS

DL EN G T H

RESERV ED

NE XT O UT PUT FRAG M EN T C HAIN E NT RY

RE SER VE D

O U T P UT BU FFE R LEN GT H

O UT PUT F RAG M ENT AD DR ES S

O utput R andom D ata

(Packet Length)

P acket D escrip to r

LE NG T H

O PCODE

C O M M AND CO NT EX T ADDR ES S

N EX T IN PUT F RAG M ENT CH AIN E NT R Y

RE SER VE D

INP UT FR AG M E NT LEN GT H

INP UT FR AG M E NT AD DRE SS

DL EN G T H

RESERV ED

NE XT O UT PUT FRAG M EN T C HAIN E NT RY

RE SER VE D

O U T P UT BU FFE R LEN GT H

O UT PUT F RAG M ENT AD DR ES S

C O M M AND CO NT EX T ADDR ES S

N EX T IN PUT F RAG M ENT CH AIN E NT R Y

RE SER VE D

INP UT FR AG M E NT LEN GT H

INP UT FR AG M E NT AD DRE SS

DL EN G T H

RESERV ED

NE XT O UT PUT FRAG M EN T C HAIN E NT RY

RE SER VE D

O U T P UT BU FFE R LEN GT H

O UT PUT F RAG M ENT AD DR ES S

O utput R andom D ata

(Packet Length)

P acket D escrip to r

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