tc_ctr_mode() function

CTR mode encryption/decryption procedure. CTR mode encrypts (or decrypts) inlen bytes from in buffer into out buffer

Syntax

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Summary

Declaration

Definition

from ctr_mode.h:101

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

Implemented in ctr_mode.c:37

Arguments

Argument

Description

out

OUT -- produced ciphertext (plaintext)

outlen

IN -- length of ciphertext buffer in bytes

IN -- data to encrypt (or decrypt)

inlen

IN -- length of input data in bytes

ctr

IN/OUT -- the current counter value

sched

IN -- an initialized AES key schedule

Return value

returns TC_CRYPTO_SUCCESS (1) returns TC_CRYPTO_FAIL (0) if: out == NULL or in == NULL or ctr == NULL or sched == NULL or inlen == 0 or outlen == 0 or inlen != outlen

Notes

Assumes:- The current value in ctr has NOT been used with sched - out points to inlen bytes - in points to inlen bytes - ctr is an integer counter in littleEndian format - sched was initialized by aes_set_encrypt_key