tc_cbc_mode_encrypt() function

CBC encryption procedure CBC encrypts inlen bytes of the in buffer into the out buffer using the encryption key schedule provided, prepends iv to out

Syntax

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Summary

Declaration

Definition

from cbc_mode.h:110

int tc_cbc_mode_encrypt(uint8_t *out, unsigned int outlen, const uint8_t *in, unsigned int inlen, const uint8_t *iv, const TCAesKeySched_t sched);

Implemented in cbc_mode.c:37

Arguments

Argument

Description

out

IN/OUT -- buffer to receive the ciphertext

outlen

IN -- length of ciphertext buffer in bytes

IN -- plaintext to encrypt

inlen

IN -- length of plaintext buffer in bytes

IN -- the IV for the this encrypt/decrypt

sched

IN -- AES key schedule for this encrypt

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 (inlen % TC_AES_BLOCK_SIZE) != 0 or (outlen % TC_AES_BLOCK_SIZE) != 0 or outlen != inlen + TC_AES_BLOCK_SIZE

Notes

Assumes: - sched has been configured by aes_set_encrypt_key - iv contains a 16 byte random string - out buffer is large enough to hold the ciphertext + iv - out buffer is a contiguous buffer - in holds the plaintext and is a contiguous buffer - inlen gives the number of bytes in the in buffer