10

MPC185 Security Processor Technical Summary

MOTOROLA

7.7 Random Number Generator (RNG)

The RNG is a digital integrated circuit capable of generating 32-bit random numbers. It is designed to

comply with FIPS 140-1 standards for randomness and non-determinism.

Because many cryptographic algorithms use random numbers as a source for generating a secret value (a

nonce), it is desirable to have a private RNG for use by the MPC185. The anonymity of each random number

must be maintained, as well as the unpredictability of the next random number. The FIPS-140 ‘common

criteria’ compliant private RNG allows the system to develop random challenges or random secret keys. The

secret key can thus remain hidden from even the high-level application code, providing an added measure

of physical security.

7.8 32KB General Purpose RAM (gpRAM)

The MPC185 contains 32KB of internal general purpose RAM that can be used to store keys, IVs and data.

The internal scratchpad allows the user to store frequently used context on chip which increases system

performance by minimizing setup time. This feature is especially important when dealing with small

packets and in systems where bus bandwidth is limited.

8

Performance Estimates

Bulk encryption/authentication performance estimates shown in Table 8-1 include data/key/context reads

(from memory to MPC185), security processing (internal to MPC185), and writes of completed

data/context to memory by MPC185, using typical 60x system overhead.

The MPC185 supports single pass processing of encryption/message authentication. All performance

measurements assume standard memory latency, and unconstrained use of an 83Mhz, 64-bit bus utilizing

the 60x bus protocol.

9 Revision History

Table 9-1 summarizes the revision history of this document.

Table 8-1. Estimated Bulk Data Encryption Performance (Mbps)

DES

CBC

3DES

CBC

AES 128

AES 256

ARC4

MD5

SHA-1

Kasumi

3DES/

HMAC-

SHA-1(Rx)

64 byte

204

168

180

153

102

177

162

93

138

128 byte

355

260

281

239

176

311

279

104

237

256 byte

562

358

391

332

279

472

411

230

350

512 byte

815

449

489

415

404

636

540

316

459

1024 byte

1051

513

557

473

521

770

639

391

544

1536 byte

1164

538

585

497

595

828

681

426

579

Freescale Semiconductor, Inc.

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Go to: www.freescale.com