Struct Ccm 

pub struct Ccm<C, const TAG_LEN: usize = 16> { /* private fields */ }

Counter with CBC-MAC (CCM) with compile-time detached tag length.

TAG_LEN must be one of RFC 3610’s valid lengths: {4, 6, 8, 10, 12, 14, 16}.

Implementations

impl<C, const TAG_LEN: usize> Ccm<C, TAG_LEN>

pub fn new(cipher: C) -> Self

Wrap a 128-bit block cipher in SP 800-38C CCM mode.

pub fn cipher(&self) -> &C

Borrow the wrapped block cipher.

pub fn tag_len(&self) -> usize

Return the detached authentication tag length in bytes.

impl<C: BlockCipher, const TAG_LEN: usize> Ccm<C, TAG_LEN>

pub fn compute_tag( &self, nonce: &[u8], aad: &[u8], plaintext: &[u8], ) -> [u8; TAG_LEN]

Compute a detached CCM tag over plaintext and associated data.

pub fn encrypt( &self, nonce: &[u8], aad: &[u8], data: &mut [u8], ) -> [u8; TAG_LEN]

Encrypt data in place and return the detached CCM authentication tag.

pub fn decrypt( &self, nonce: &[u8], aad: &[u8], data: &mut [u8], tag: &[u8; TAG_LEN], ) -> bool

Verify tag and decrypt in place on success.

Returns false and leaves data unchanged when verification fails.

Trait Implementations

impl<C: BlockCipher, const TAG_LEN: usize> Aead for Ccm<C, TAG_LEN>

type Tag = [u8; TAG_LEN]

Detached authentication tag type.

fn encrypt_in_place( &self, nonce: &[u8], aad: &[u8], data: &mut [u8], ) -> Self::Tag

Encrypt data in place and return its authentication tag.

fn decrypt_in_place( &self, nonce: &[u8], aad: &[u8], data: &mut [u8], tag: &Self::Tag, ) -> bool

Decrypt data in place after authenticating tag.

fn encrypt( &self, nonce: &[u8], aad: &[u8], plaintext: &[u8], ) -> (Vec<u8>, Self::Tag)

Encrypt plaintext and return (ciphertext, tag).

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

Decrypt ciphertext and return plaintext on successful authentication.