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SourceVuESP-IDF Framework and ExamplesmbedTLSmbedtls_entropy_func()

mbedtls_entropy_func() function

Retrieve entropy from the accumulator (Maximum length: MBEDTLS_ENTROPY_BLOCK_SIZE) (Thread-safe if MBEDTLS_THREADING_C is enabled)

Syntax

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Summary

Declaration

Definition

from entropy.h:185

int mbedtls_entropy_func(void *data, unsigned char *output, size_t len);

Implemented in entropy.c:270

Arguments

Argument

Description

data

Entropy context

output

Buffer to fill

len

Number of bytes desired, must be at most MBEDTLS_ENTROPY_BLOCK_SIZE

Return value

0 if successful, or MBEDTLS_ERR_ENTROPY_SOURCE_FAILED

Examples

mbedtls_entropy_func() is referenced by 4 libraries and example projects:

ESP-IDF

https_mbedtls sample

smtp_client sample

pre_encrypted_ota sample

References

from 0/4 examples

Code

Location

Referrer

int mbedtls_entropy_func(void *data, unsigned char *output, size_t len)

entropy.c:270

int mbedtls_entropy_func(void *data, unsigned char *output, size_t len);

entropy.h:185

if ((ret = mbedtls_entropy_func(ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE)) != 0) {

entropy.c:412

mbedtls_entropy_write_seed_file()

if ((ret = mbedtls_entropy_func(&ctx, buf, sizeof(buf))) != 0) {

entropy.c:641

mbedtls_entropy_self_test()

return mbedtls_ctr_drbg_seed(drbg_ctx, mbedtls_entropy_func, entropy, custom, len);

psa_crypto_random_impl.h:117

mbedtls_psa_drbg_seed()

Call Tree

from 0/4 examples

mbedtls_entropy_func() is called by 2 functions and calls 10 functions:

mbedtls_entropy_write_seed_file()

mbedtls_entropy_self_test()

mbedtls_entropy_func()

mbedtls_platform_zeroize()

mbedtls_md_info_from_type()

entropy_gather_internal()

Data Use

from 0/4 examples

mbedtls_entropy_func() reads 6 variables and writes 2 variables:

mbedtls_md_type_t::MBEDTLS_MD_SHA512

mbedtls_entropy_source_state::size

mbedtls_entropy_source_state::threshold

mbedtls_entropy_source_state::strong

mbedtls_entropy_context::source_count

mbedtls_entropy_context::source

mbedtls_entropy_func()

mbedtls_psa_drbg_seed()

mbedtls_entropy_source_state::size

Class Tree

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Override Tree

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Implementations

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Instances

from 0/4 examples

Lifecycle

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