STM32WBA62CGF6 datasheet(55/185 Pages) STMICROELECTRONICS

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DS14736 Rev 1

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STM32WBA6xxx

Functional overview

•

Corresponding 32-bit words of the digest from consecutive message blocks are added

to each other to form the digest of the whole message

–

Automatic 32-bit words swapping to comply with the internal little-endian

representation of the input bit string

–

Word swapping supported: bits, bytes, half-words and 32-bit words

•

Automatic padding to complete the input bit string to fit digest minimum block size of

512 bits (16 × 32 bits)

•

Single 32-bit input register associated to an internal input FIFO of sixteen 32-bit words,

corresponding to one block size

•

AHB slave peripheral, accessible through 32-bit word accesses only (else an AHB

error is generated)

•

8 × 32-bit words (H0 to H7) for output message digest

•

Automatic data flow control with support of direct memory access (DMA) using one

channel. Single or fixed burst of 4 supported.

•

Interruptible message digest computation, on a per-32-bit word basis

–

Re-loadable digest registers

–

Hashing computation suspend/resume mechanism, including using DMA

3.27

Public key accelerator (PKA)

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

those related to RSA, DU (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 CRT (Chinese remainder theorem)

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

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