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SourceVuESP-IDF Framework and ExamplesESP-IDFtc_hmac_prng_reseed()

tc_hmac_prng_reseed() function

HMAC-PRNG reseed procedure Mixes seed into prng, enables tc_hmac_prng_generate

Syntax

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Summary

Declaration

Definition

from hmac_prng.h:139

int tc_hmac_prng_reseed(TCHmacPrng_t prng, const uint8_t *seed, unsigned int seedlen, const uint8_t *additional_input, unsigned int additionallen);

Implemented in hmac_prng.c:138

Arguments

Argument

Description

prng

IN/OUT -- the PRNG state

seed

IN -- entropy to mix into the prng

seedlen

IN -- length of seed in bytes

additional_input

IN -- additional input to the prng

additionallen

IN -- additional input length in bytes

Return value

returns TC_CRYPTO_SUCCESS (1) returns TC_CRYPTO_FAIL (0) if: prng == NULL, seed == NULL, seedlen < MIN_SLEN, seendlen > MAX_SLEN, additional_input != (const uint8_t *) 0 && additionallen == 0, additional_input != (const uint8_t *) 0 && additionallen > MAX_ALEN

Notes

Assumes:- tc_hmac_prng_init has been called for prng - seed has sufficient entropy.

References

Code

Location

int tc_hmac_prng_reseed(TCHmacPrng_t prng,

hmac_prng.c:158

int tc_hmac_prng_reseed(TCHmacPrng_t prng,

hmac_prng.c:138

int tc_hmac_prng_reseed(TCHmacPrng_t prng, const uint8_t *seed,

hmac_prng.h:139

int tc_hmac_prng_reseed(TCHmacPrng_t prng, const uint8_t *seed,

hmac_prng.h:139

Call Tree

tc_hmac_prng_reseed() calls 2 functions:

tc_hmac_prng_reseed()

Data Use

tc_hmac_prng_reseed() reads 8 variables and writes 1 variable:

tc_hmac_prng_reseed()

tc_hmac_prng_struct::countdown

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