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SourceVuESP-IDF Framework and ExamplesESP-IDFccm_ctr_mode()

ccm_ctr_mode() function

Variation of CTR mode used in CCM. The CTR mode used by CCM is slightly different than the conventional CTR mode (the counter is increased before encryption, instead of after encryption). Besides, it is assumed that the counter is stored in the last 2 bytes of the nonce.

Syntax

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Summary

Declaration

from ccm_mode.c:93

static int ccm_ctr_mode(uint8_t *out, unsigned int outlen, const uint8_t *in, unsigned int inlen, uint8_t *ctr, const TCAesKeySched_t sched);

Arguments

Argument

out

outlen

in

inlen

ctr

sched

References

Code

Location

Referrer

static int ccm_ctr_mode(uint8_t *out, unsigned int outlen, const uint8_t *in,

ccm_ctr_mode(out, plen, payload, plen, b, c->sched);

tc_ccm_generation_encryption()

ccm_ctr_mode(out, plen - c->mlen, payload, plen - c->mlen, b, c->sched);

tc_ccm_decryption_verification()

Call Tree

ccm_ctr_mode() is called by 2 functions and calls 2 functions:

tc_ccm_generation_encryption()

tc_ccm_decryption_verification()

ccm_ctr_mode()

tc_aes_encrypt()

Data Use

ccm_ctr_mode():

ccm_ctr_mode()

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