RadioLibAES128 Class Reference

Class to perform AES encryption, decryption and CMAC. More...

#include <Cryptography.h>

Public Member Functions
	RadioLibAES128 ()
	Default constructor.
void	init (uint8_t *key)
	Initialize the AES. More...
size_t	encryptECB (uint8_t *in, size_t len, uint8_t *out)
	Perform ECB-type AES encryption. More...
size_t	decryptECB (uint8_t *in, size_t len, uint8_t *out)
	Perform ECB-type AES decryption. More...
void	generateCMAC (uint8_t *in, size_t len, uint8_t *cmac)
	Calculate message authentication code according to RFC4493. More...
bool	verifyCMAC (uint8_t *in, size_t len, const uint8_t *cmac)
	Verify the received CMAC. This just calculates the CMAC again and compares the results. More...

Detailed Description

Class to perform AES encryption, decryption and CMAC.

Most of the implementation here is adapted from https://github.com/kokke/tiny-AES-c Additional code and CMAC calculation is from https://github.com/megrxu/AES-CMAC

Member Function Documentation

decryptECB()

size_t RadioLibAES128::decryptECB	(	uint8_t *	in,
		size_t	len,
		uint8_t *	out
	)

Perform ECB-type AES decryption.

Parameters

in	Input ciphertext data.
len	Length of the input data.
out	Buffer to save the output plaintext into. It is up to the caller to ensure the buffer is sufficiently large to save the data!

Returns

The number of bytes saved into the output buffer.

encryptECB()

size_t RadioLibAES128::encryptECB	(	uint8_t *	in,
		size_t	len,
		uint8_t *	out
	)

Perform ECB-type AES encryption.

Parameters

in	Input plaintext data (unpadded).
len	Length of the input data.
out	Buffer to save the output ciphertext into. It is up to the caller to ensure the buffer is sufficiently large to save the data!

Returns

The number of bytes saved into the output buffer.

generateCMAC()

void RadioLibAES128::generateCMAC	(	uint8_t *	in,
		size_t	len,
		uint8_t *	cmac
	)

Calculate message authentication code according to RFC4493.

Parameters

in	Input data (unpadded).
len	Length of the input data.
cmac	Buffer to save the output MAC into. The buffer must be at least 16 bytes long!

init()

void RadioLibAES128::init

(

uint8_t *

key

)

Initialize the AES.

Parameters

key	AES key to use.

verifyCMAC()

bool RadioLibAES128::verifyCMAC	(	uint8_t *	in,
		size_t	len,
		const uint8_t *	cmac
	)

Verify the received CMAC. This just calculates the CMAC again and compares the results.

Parameters

in	Input data (unpadded).
len	Length of the input data.
cmac	CMAC to verify.

Returns

True if valid, false otherwise.

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The documentation for this class was generated from the following files:

• src/utils/Cryptography.h
• src/utils/Cryptography.cpp