crypt.c File Reference

#include "crypt.h"

Functions
void	cbc_decrypt (uint8_t *cipherText, uint8_t *plainText, uint8_t *init_vector, uint32_t size)
	This function performs CBC decryption on input cipher text blocks. More...
void	cbc_encrypt (uint8_t *plainText, uint8_t *cipherText, uint8_t *init_vector, uint32_t size)
	This function performs CBC encryption on input plain text blocks. More...
void	cfb_decrypt (uint8_t *cipherText, uint8_t *plainText, uint8_t *init_vector, uint8_t mode, uint32_t size)
	This function performs CFB decryption on input cipher text blocks. More...
void	cfb_encrypt (uint8_t *plainText, uint8_t *cipherText, uint8_t *init_vector, uint8_t mode, uint32_t size)
	This function performs CFB encryption on input plain text blocks. More...
void	ctr_encrypt_decrypt (uint8_t *input_block, uint8_t *output_block, ctr_blk_t *counter, uint32_t size)
	This function performs CTR encryption/decryption on input blocks. Note: Both encryption and decryption is same for CTR mode. In both the cases, the input block to the cipher function is the counter. The resulting output is XOR-ed with plain text for encryption. For decryption case, it is XOR-ed with cipher text to retrieve the actual data. More...
void	ctr_inc_counter (ctr_blk_t *counter)
	Performs counter increment to prepare input for next round. More...
void	ecb_decrypt (uint8_t *cipherText, uint8_t *plainText, uint32_t size)
	This function performs ECB decryption on input cipher text blocks. More...
void	ecb_encrypt (uint8_t *plainText, uint8_t *cipherText, uint32_t size)
	This function performs ECB encryption on input plain text blocks. More...
void	ofb_decrypt (uint8_t *cipherText, uint8_t *plainText, uint8_t *init_vector, uint32_t size)
	This function performs OFB decryption on input cipher text blocks. More...
void	ofb_encrypt (uint8_t *plainText, uint8_t *cipherText, uint8_t *init_vector, uint32_t size)
	This function performs OFB encryption on input plain text blocks. More...

Variables
uint8_t	counter_block [AES_BLOCK_SIZE] = {0}
	Support and FAQ: visit Microchip Support More...

void cbc_decrypt	(	uint8_t *	cipherText,
		uint8_t *	plainText,
		uint8_t *	init_vector,
		uint32_t	size
	)

This function performs CBC decryption on input cipher text blocks.

Parameters

cipherText	pointer to the array containing the cipher text bytes
plainText	pointer to the array where the decrypted plain text has to be stored
init_vector	pointer to the array containing the unique initialization vector
size	size of the input plain text

References AES_BLOCK_SIZE, and aes_inverse_cipher().

Referenced by main().

void cbc_encrypt	(	uint8_t *	plainText,
		uint8_t *	cipherText,
		uint8_t *	init_vector,
		uint32_t	size
	)

This function performs CBC encryption on input plain text blocks.

Parameters

plainText	pointer to the array containing the plain text bytes
cipherText	pointer to the array where the encrypted cipher output has to be stored
init_vector	pointer to the array containing the unique initialization vector
size	size of the input plain text

References AES_BLOCK_SIZE, and aes_cipher().

Referenced by main().

void cfb_decrypt	(	uint8_t *	cipherText,
		uint8_t *	plainText,
		uint8_t *	init_vector,
		uint8_t	mode,
		uint32_t	size
	)

This function performs CFB decryption on input cipher text blocks.

Parameters

cipherText	pointer to the array containing the cipher text bytes
plainText	pointer to the array where the decrypted plain text has to be stored
init_vector	pointer to the array containing the unique initialization vector
mode	CFB mode in bits - can be 8, 64, 128.
size	size of the input plain text

References AES_BLOCK_SIZE, and aes_cipher().

Referenced by main().

void cfb_encrypt	(	uint8_t *	plainText,
		uint8_t *	cipherText,
		uint8_t *	init_vector,
		uint8_t	mode,
		uint32_t	size
	)

This function performs CFB encryption on input plain text blocks.

Parameters

plainText	pointer to the array containing the plain text bytes
cipherText	pointer to the array where the encrypted cipher output has to be stored
init_vector	pointer to the array containing the unique initialization vector
mode	CFB mode in bits - can be 8, 16, 32, 64, 128.
size	size of the input plain text

References AES_BLOCK_SIZE, and aes_cipher().

Referenced by main().

void ctr_encrypt_decrypt	(	uint8_t *	input_block,
		uint8_t *	output_block,
		ctr_blk_t *	counter,
		uint32_t	size
	)

This function performs CTR encryption/decryption on input blocks. Note: Both encryption and decryption is same for CTR mode. In both the cases, the input block to the cipher function is the counter. The resulting output is XOR-ed with plain text for encryption. For decryption case, it is XOR-ed with cipher text to retrieve the actual data.

This function performs CTR encryption/decryption on input blocks. Note: Both encryption and decryption is same for CTR mode. In both the cases, the input block to the cipher process is the counter. The resulting output is XOR-ed with plain text for encryption. For decryption case, it is XOR-ed with cipher text to retrieve the actual data.

Parameters

plainText	pointer to the array containing the plain text bytes
cipherText	pointer to the array where the encrypted cipher output has to be stored
counter	pointer to the structure containing the counter block
size	size of the input plain text

References AES_BLOCK_SIZE, aes_cipher(), ctr_blk_t::counter, counter_block, ctr_inc_counter(), ctr_blk_t::i_vector, and ctr_blk_t::nonce.

Referenced by main().

void ctr_inc_counter

(

ctr_blk_t *

counter

)

Performs counter increment to prepare input for next round.

Parameters

counter

value of counter used in CTR mode

References ctr_blk_t::counter, counter_block, ctr_blk_t::i_vector, and ctr_blk_t::nonce.

Referenced by ctr_encrypt_decrypt().

void ecb_decrypt	(	uint8_t *	cipherText,
		uint8_t *	plainText,
		uint32_t	size
	)

This function performs ECB decryption on input cipher text blocks.

Parameters

cipherText	pointer to the array containing the cipher text bytes
plainText	pointer to the array where the decrypted plain text has to be stored
size	size of the input plain text

References AES_BLOCK_SIZE, and aes_inverse_cipher().

Referenced by main().

void ecb_encrypt	(	uint8_t *	plainText,
		uint8_t *	cipherText,
		uint32_t	size
	)

This function performs ECB encryption on input plain text blocks.

Parameters

plainText	pointer to the array containing the plain text bytes
cipherText	pointer to the array where the encrypted cipher output has to be stored
size	size of the input plain text

References AES_BLOCK_SIZE, and aes_cipher().

Referenced by main().

void ofb_decrypt	(	uint8_t *	cipherText,
		uint8_t *	plainText,
		uint8_t *	init_vector,
		uint32_t	size
	)

This function performs OFB decryption on input cipher text blocks.

Parameters

cipherText	pointer to the array containing the cipher text bytes
plainText	pointer to the array where the decrypted plain text has to be stored
init_vector	pointer to the array containing the unique initialization vector
size	size of the input plain text

References AES_BLOCK_SIZE, and aes_cipher().

void ofb_encrypt	(	uint8_t *	plainText,
		uint8_t *	cipherText,
		uint8_t *	init_vector,
		uint32_t	size
	)

This function performs OFB encryption on input plain text blocks.

Parameters

plainText	pointer to the array containing the plain text bytes
cipherText	pointer to the array where the encrypted cipher output has to be stored
init_vector	pointer to the array containing the unique initialization vector
size	size of the input plain text

References AES_BLOCK_SIZE, and aes_cipher().

Referenced by main().

uint8_t counter_block[AES_BLOCK_SIZE] = {0}

Support and FAQ: visit Microchip Support

Referenced by ctr_encrypt_decrypt(), and ctr_inc_counter().