STM32L552CCT3PXXX datasheet(67/340 Pages) STMICROELECTRONICS

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DS12737 Rev 6

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STM32L552xx

Functional overview

3.28

True random number generator (RNG)

The RNG is a true random number generator that provides full entropy outputs to the

application as 32-bit samples. It is composed of a live entropy source (analog) and an

internal conditioning component.

The RNG is a NIST SP 800-90B compliant entropy source that can be used to construct a

non-deterministic random bit generator (NDRBG).

The true random number generator:

•

delivers 32-bit true random numbers, produced by an analog entropy source

conditioned by a NIST SP800-90B approved conditioning stage,

•

can be used as entropy source to construct a non-deterministic random bit generator

(NDRBG),

•

produces four 32-bit random samples every 412 AHB clock cycles if fAHB < 77 MHz

(256 RNG clock cycles otherwise),

•

embeds start-up and NIST SP800-90B approved continuous health tests (repetition

count and adaptive proportion tests), associated with specific error management,

•

can be disabled to reduce power consumption, or enabled with an automatic low-power

mode (default configuration),

•

has an AMBA AHB slave peripheral, accessible through 32-bit word single accesses

only (else an AHB bus error is generated, and the write accesses are ignored).

3.29

HASH hardware accelerator (HASH)

The hash processor is a fully compliant implementation of the secure hash algorithm (SHA-

1, SHA-224, SHA-256), the MD5 (message-digest algorithm 5) hash algorithm and the

HMAC (keyed-hash message authentication code) algorithm suitable for a variety of

applications.

It computes a message digest (160 bits for the SHA-1 algorithm, 256 bits for the SHA-256

algorithm and 224 bits for the SHA-224 algorithm,128 bits for the MD5 algorithm) for

messages of up to (264 - 1) bits, while the HMAC algorithms provide a way of authenticating

messages by means of hash functions. The HMAC algorithms consist in calling the SHA-1,

SHA-224, SHA-256 or MD5 hash function twice.

3.30

Timers and watchdogs

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

basic timers, two low-power timers, two watchdog timers and a SysTick timer.

Table 16 compares the features of the advanced control, general-purpose and basic timers.

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