TRNG (True Random Number Generator)

General Description

High level interface to the True Random Number Generator (TRNG).

This block uses dedicated hardware to efficiently generate true random numbers.

Features

• Number generated is statistically random
• Based on physical processes exhibiting random variation
• Generated sequences of numbers cannot be duplicated by running the process again
• Uses polynomial generators with fixed and programmable polynomials

Note

This driver is not intended to be used as a security library. If a full security library is needed something like Mbed TLS should be used instead.

Quick Start

cyhal_trng_init initializes the TRNG and passes a pointer to the TRNG block through the obj object of type cyhal_trng_t.

See Simple TRNG number generation example.

Simple TRNG number generation example

The following snippet initializes a TRNG and generates a true random number.

    cy_rslt_t    rslt;
    cyhal_trng_t trng_obj;
    uint32_t     rnd_num;

    // Initialize the true random number generator block
    rslt = cyhal_trng_init(&trng_obj);

    // Generate a true random number
    rnd_num = cyhal_trng_generate(&trng_obj);

    // Release the true random number generator block
    // Note: Free only if not required anymore
    cyhal_trng_free(&trng_obj);

API Reference
	TRNG HAL Results
	TRNG specific return codes.

Functions
cy_rslt_t	cyhal_trng_init (cyhal_trng_t *obj)
	Initialize the random number generator. More...
void	cyhal_trng_free (cyhal_trng_t *obj)
	Release the random number generator. More...
uint32_t	cyhal_trng_generate (const cyhal_trng_t *obj)
	Generate a random number. More...

Function Documentation

cyhal_trng_init()

cy_rslt_t cyhal_trng_init

(

cyhal_trng_t *

obj

)

Initialize the random number generator.

Parameters

[out]

obj

Pointer to a random number generator object. The caller must allocate the memory for this object but the init function will initialize its contents.

Returns

The status of the init request

Returns CY_RSLT_SUCCESS if the operation was successful

cyhal_trng_free()

void cyhal_trng_free

(

cyhal_trng_t *

obj

)

Release the random number generator.

Parameters

[in,out]

obj

The random number generator object

cyhal_trng_generate()

uint32_t cyhal_trng_generate

(

const cyhal_trng_t *

obj

)

Generate a random number.

Parameters

[in]

obj

The random number generator object

Returns

The random number generated

See Simple TRNG number generation example