Struct AesCcm 

pub struct AesCcm<'c, const KEY_SIZE: usize, const IV_SIZE: usize, const TAG_SIZE: usize> { /* private fields */ }

AES-CCM Cipher Mode (Counter with CBC-MAC)

Implementations

impl<'c, const KEY_SIZE: usize, const IV_SIZE: usize, const TAG_SIZE: usize> AesCcm<'c, KEY_SIZE, IV_SIZE, TAG_SIZE>

pub fn new( key: &'c [u8; KEY_SIZE], iv: &'c [u8; IV_SIZE], aad_len: usize, payload_len: usize, ) -> Self

Constructs a new AES-CCM cipher for a cryptographic operation.

• key: The encryption key (16 or 32 bytes)
• iv: The nonce/IV (7-13 bytes recommended, typically 12 bytes)
• aad_len: Length of additional authenticated data (known in advance)
• payload_len: Length of payload data (known in advance)

Note: CCM requires knowing the data lengths in advance.

Trait Implementations

impl<'c, const KEY_SIZE: usize, const IV_SIZE: usize, const TAG_SIZE: usize> Cipher<'c> for AesCcm<'c, KEY_SIZE, IV_SIZE, TAG_SIZE>

const REQUIRES_PADDING: bool = false

Indicates whether the cipher requires the application to provide padding.

fn key(&self) -> &[u8]

Returns the symmetric key.

fn iv(&self) -> &[u8]

Returns the initialization vector.

fn set_mode(&self, p: Aes)

Sets the cipher mode (CHMOD field).

fn init_phase_blocking<T: Instance, M: Mode>( &self, p: Aes, _aes: &Aes<'_, T, M>, )

Performs any cipher-specific initialization.

async fn init_phase<T: Instance>(&self, p: Aes, _aes: &mut Aes<'_, T, Async>)

Performs any cipher-specific initialization (async).

fn pre_final(&self, p: Aes, _dir: Direction, padding_len: usize) -> [u32; 4]

Called prior to processing the last data block for cipher-specific operations.

fn uses_gcm_phases(&self) -> bool

Indicates whether this cipher mode uses GCM/CCM phases (init, header, payload, final).

fn is_ccm_mode(&self) -> bool

Indicates whether this is CCM mode (which has different final phase handling). CCM doesn’t use a length block in the final phase, unlike GCM.

fn ccm_b0(&self) -> Option<&[u8; 16]>

Returns the pre-computed B0 block for CCM mode (None for other modes).

const BLOCK_SIZE: usize = 16usize

Processing block size (always 16 bytes for AES).

fn key_size(&self) -> KeySize

Returns the key size.

fn datatype(&self) -> u8

Returns the data type setting for this cipher mode.

fn prepare_key(&self, _p: Aes, _dir: Direction)

Performs any key preparation within the processor, if necessary.

fn post_final_blocking<T: Instance, M: Mode>( &self, _p: Aes, _aes: &Aes<'_, T, M>, _dir: Direction, _int_data: &mut [u8; 16], _temp1: [u32; 4], _padding_mask: [u8; 16], )

Called after processing the last data block for cipher-specific operations.

async fn post_final<T: Instance>( &self, _p: Aes, _aes: &mut Aes<'_, T, Async>, _dir: Direction, _int_data: &mut [u8; 16], _temp1: [u32; 4], _padding_mask: [u8; 16], )

Called after processing the last data block for cipher-specific operations (async).

fn get_header_block(&self) -> &[u8]

Returns the AAD header block as required by the cipher (for authenticated modes).

fn ccm_format_aad_header(&self, aad_len: usize) -> ([u8; 10], usize)

Returns the formatted AAD length prefix for CCM mode. CCM requires AAD to be prefixed with its length encoding.

impl<'c, const KEY_SIZE: usize, const IV_SIZE: usize, const TAG_SIZE: usize> CipherAuthenticated<TAG_SIZE> for AesCcm<'c, KEY_SIZE, IV_SIZE, TAG_SIZE>

const TAG_SIZE: usize = TAG_SIZE

Defines the authentication tag size.

impl<'c, const IV_SIZE: usize, const TAG_SIZE: usize> CipherSized for AesCcm<'c, { _ }, IV_SIZE, TAG_SIZE>

impl<'c, const IV_SIZE: usize, const TAG_SIZE: usize> CipherSized for AesCcm<'c, { _ }, IV_SIZE, TAG_SIZE>

impl<'c, const KEY_SIZE: usize, const IV_SIZE: usize, const TAG_SIZE: usize> IVSized for AesCcm<'c, KEY_SIZE, IV_SIZE, TAG_SIZE>