#include "aes/rijndael.h"

Functions
long int	dtls_ccm_encrypt_message (rijndael_ctx ctx, size_t M, size_t L, unsigned char nonce[DTLS_CCM_BLOCKSIZE], unsigned char msg, size_t lm, const unsigned char *aad, size_t la)

long int	dtls_ccm_decrypt_message (rijndael_ctx ctx, size_t M, size_t L, unsigned char nonce[DTLS_CCM_BLOCKSIZE], unsigned char msg, size_t lm, const unsigned char *aad, size_t la)

Macro Definition Documentation

#define DTLS_CCM_BLOCKSIZE 16

size of hmac blocks

Definition at line 33 of file ccm.h.

#define DTLS_CCM_MAX 16

max number of bytes in digest

Definition at line 34 of file ccm.h.

#define DTLS_CCM_NONCE_SIZE 12

size of nonce

Definition at line 35 of file ccm.h.

Function Documentation

long int dtls_ccm_decrypt_message	(	rijndael_ctx *	ctx,
		size_t	M,
		size_t	L,
		unsigned char	nonce[DTLS_CCM_BLOCKSIZE],
		unsigned char *	msg,
		size_t	lm,
		const unsigned char *	aad,
		size_t	la
	)

Definition at line 240 of file ccm.c.

long int dtls_ccm_encrypt_message	(	rijndael_ctx *	ctx,
		size_t	M,
		size_t	L,
		unsigned char	nonce[DTLS_CCM_BLOCKSIZE],
		unsigned char *	msg,
		size_t	lm,
		const unsigned char *	aad,
		size_t	la
	)

Authenticates and encrypts a message using AES in CCM mode. Please see also RFC 3610 for the meaning of M, L, lm and la.

Parameters

ctx	The initialized rijndael_ctx object to be used for AES operations.
M	The number of authentication octets.
L	The number of bytes used to encode the message length.
N	The nonce value to use. You must provide `DTLS_CCM_BLOCKSIZE` nonce octets, although only the first `16` - `L` are used.
msg	The message to encrypt. The first `la` octets are additional authentication data that will be cleartext. Note that the encryption operation modifies the contents of `msg` and adds `M` bytes MAC. Therefore, the buffer must be at least `lm` + `M` bytes large.
lm	The actual length of `msg`.
aad	A pointer to the additional authentication data (can be `NULL` if `la` is zero).
la	The number of additional authentication octets (may be zero).

Definition at line 176 of file ccm.c.