5812-DS00-R datasheet(44/84 Pages) BOARDCOM

44 / 84 page

BCM5812

Advance Data Sheet

3/11/03

B roa dcom Co rpo rat ion

Page 36

Cryptographic Operations

Document

5812-DS01-405-R

Figure 32: Modular Add

Figure 33 on page 37 shows the structure values for computing (A-B) mod N, and Figure 34 on page 38 for computing (A *

B) mod N. Figure 35 on page 39 shows the unary operation A mod N, used to compute the remainder, and

Figure 36 on page 40 shows AE mod N. In all cases, the parameters are otherwise as described above for modular addition.

Figure 37 on page 41 shows the command context, input, and output structures for double modular exponentiation. This

function is useful for performing the RSA private key operation when the modulus is the product of three or more primes

(referred to as Multi-PrimeTM). In this case, the lengths for the two moduli length, in bits, are supplied in the command context

as modulus N1 Length and modulus N0 length, respectively. Both values, in bits, must be between 16 and 512. All input and

output parameters must be supplied in either 256 (32 byte) or 512 bit (64 byte) buffers.

Table 12: Allowed Modular Arithmetic Parameter Field Size Increments

Modulus Length, in Bits

Parameter Size in 32-bit words

Parameter SIze in Bytes

16-256

257-512

513-768

769-1024

128

1025-1536

192

1537-2048

256

NEXT INPUT FRAGMENT CHAIN ENTRY

RESERVED

FRAGMENT LENGTH

INPUT FRAGMENT ADDRESS

Addend A

(Modulus Length)

Addend B

(Modulus Length)

A+B mod N

(Modulus Length)

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

LENGTH

OPCODE

MODULUS N

64-256

Bytes

MODULUS LENGTH

RESERVED

Command Context

Packet Descriptor

NEXT INPUT FRAGMENT CHAIN ENTRY

RESERVED

FRAGMENT LENGTH

INPUT FRAGMENT ADDRESS

Addend A

(Modulus Length)

Addend B

(Modulus Length)

A+B mod N

(Modulus Length)

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

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

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

LENGTH

OPCODE

MODULUS N

64-256

Bytes

MODULUS LENGTH

RESERVED

Command Context

Packet Descriptor

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