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SourceVuESP-IDF Framework and ExamplesESP-IDFtc_hmac_prng_generate()

tc_hmac_prng_generate() function

HMAC-PRNG generate procedure Generates outlen pseudo-random bytes into out buffer, updates prng

Syntax

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Summary

Declaration

Definition

from hmac_prng.h:158

int tc_hmac_prng_generate(uint8_t *out, unsigned int outlen, TCHmacPrng_t prng);

Implemented in hmac_prng.c:177

Arguments

Argument

Declared as

Description

out

uint8_t *

IN/OUT -- buffer to receive output

outlen

unsigned int

IN -- size of out buffer in bytes

prng

TCHmacPrng_t

IN/OUT -- the PRNG state

Return value

returns TC_CRYPTO_SUCCESS (1) returns TC_HMAC_PRNG_RESEED_REQ (-1) if a reseed is needed returns TC_CRYPTO_FAIL (0) if: out == NULL, prng == NULL, outlen == 0, outlen >= MAX_OUT

Notes

Assumes tc_hmac_prng_init has been called for prng

References

Code

Location

int tc_hmac_prng_generate(uint8_t *out, unsigned int outlen, TCHmacPrng_t prng)

hmac_prng.c:196

int tc_hmac_prng_generate(uint8_t *out, unsigned int outlen, TCHmacPrng_t prng)

hmac_prng.c:177

int tc_hmac_prng_generate(uint8_t *out, unsigned int outlen, TCHmacPrng_t prng);

hmac_prng.h:158

int tc_hmac_prng_generate(uint8_t *out, unsigned int outlen, TCHmacPrng_t prng);

hmac_prng.h:158

Call Tree

tc_hmac_prng_generate() calls 7 functions:

tc_hmac_prng_generate()

Data Use

tc_hmac_prng_generate() reads 5 variables and writes 1 variable:

tc_hmac_prng_struct::v

tc_hmac_prng_struct::countdown

MAX_OUT

tc_hmac_prng_struct::key

tc_hmac_prng_generate()

tc_hmac_prng_struct::countdown

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