STM32H533CEU6 datasheet(45/231 Pages) STMICROELECTRONICS

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DS14539 Rev 1

45/231

STM32H533xx

Functional overview

•

Encryption mode

3.32

Public key accelerator (PKA)

The PKA is used for the computation of cryptographic public key primitives, specifically

those related to RSA, Diffie-Hellmann or ECC (elliptic curve cryptography) over GF(p)

(Galois fields). To achieve high performance at a reasonable cost, these operations are

executed in the Montgomery domain.

All needed computations are performed within the accelerator, so no further

hardware/software elaboration is needed to process the inputs or the outputs.

The PKA main features are:

•

Acceleration of RSA, DH and ECC over GF(p) operations, based on the Montgomery

method for fast modular multiplications. More specifically:

–

RSA modular exponentiation, RSA Chinese remainder theorem (CRT)

exponentiation

–

ECC scalar multiplication, point on curve check, complete addition, double base

ladder, projective to affine

–

ECDSA signature generation and verification

•

Capability to handle operands up to 4160 bits for RSA/DH and 640 bits for ECC

•

Arithmetic and modular operations such as addition, subtraction, multiplication,

modular reduction, modular inversion, comparison, and Montgomery multiplication

•

Built-in Montgomery domain inward and outward transformations

•

Protection against differential power analysis (DPA) and related side-channel attacks.

3.33

Timers and watchdogs

The devices include two advanced control timers, up to seven general-purpose timers, two

basic timers, six low-power timers, two watchdog timers and two SysTick timers.

Table 7 compares the features of the advanced control, general-purpose and basic timers.

Table 7. Timer features

Type

Timer

Counter

resolution

Counter

type

Prescaler

factor

DMA

request

generation

Capture/

compare

channels

Complementary

outputs

Advanced

control

TIM1, TIM8

16 bits

Up, down,

up/down

Any integer

between 1 and

65536

Yes

General

purpose

TIM2, TIM5

32 bits

TIM3, TIM4

16 bits

General

purpose

TIM12, TIM15

16 bits

Basic

TIM6, TIM7

16 bits

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