Struct AesCcm 

pub struct AesCcm { /* private fields */ }

AES-CCM with the RFC 3610 default parameters: L = 2, so the nonce is 13 bytes and the maximum payload is 2^16 - 1 bytes. The tag length M is configurable per call.

This is the wrapper most callers want. The generic (M, L) form is exposed via ccm_encrypt / ccm_decrypt for protocols that need a different L.

Implementations

impl AesCcm

pub fn new(key: &[u8], m: usize) -> Option<Self>

Initialise AES-CCM with M ∈ {4, 6, 8, 10, 12, 14, 16}. Returns None for invalid M or invalid AES key length.

pub fn encrypt( &self, nonce: &[u8; 13], aad: &[u8], plaintext: &[u8], ) -> Option<(Vec<u8>, Vec<u8>)>

Encrypt and authenticate. nonce.len() == 13. Returns (ciphertext, tag) where tag.len() == M.

pub fn decrypt( &self, nonce: &[u8; 13], aad: &[u8], ciphertext: &[u8], tag: &[u8], ) -> Option<Vec<u8>>

Decrypt and verify. nonce.len() == 13, tag.len() == M. Returns None on tag mismatch or any malformed input.