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STM32U5A5QJ Datasheet(PDF) 83 Page - STMicroelectronics |
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STM32U5A5QJ Datasheet(HTML) 83 Page - STMicroelectronics |
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83 / 382 page  DS13543 Rev 1 83/382 STM32U5Axxx Functional overview 99 3.46 Public key accelerator (PKA) The PKA is intended 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. 3.47 Timers and watchdogs The devices include two advanced control timers, up to seven general-purpose timers, two basic timers, four low-power timers, two watchdog timers and two SysTick timers. The table below compares the features of the advanced control, general-purpose and basic timers. Table 20. Timer feature comparison Timer 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 4 3 General- purpose TIM2, TIM3, TIM4, TIM5 32 bits Up, down, Up/down Any integer between 1 and 65536 Yes 4 No General- purpose TIM15 16 bits Up Any integer between 1 and 65536 Yes 2 1 |
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