Struct HmacSha256 

pub struct HmacSha256;

HMAC-SHA-256 message authentication code (32-byte tag).

Implementations

impl HmacSha256

pub fn mac_truncated( &self, key: &[u8], msg: &[u8], out: &mut [u8], ) -> Result<(), CryptoError>

Compute a truncated HMAC-SHA-256 tag.

Writes the first out.len() bytes of the full 32-byte HMAC into out. Returns CryptoError::BadInput if out.len() < 16 (minimum safe truncation length per NIST SP 800-117).

pub fn verify_truncated( &self, key: &[u8], msg: &[u8], tag: &[u8], ) -> Result<(), CryptoError>

Verify a truncated HMAC-SHA-256 tag in constant time.

Returns CryptoError::BadInput if tag.len() < 16, or CryptoError::InvalidTag on mismatch.

Trait Implementations

impl Clone for HmacSha256

fn clone(&self) -> HmacSha256

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HmacSha256

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for HmacSha256

fn default() -> HmacSha256

Returns the “default value” for a type.

impl Mac for HmacSha256

fn name(&self) -> &'static str

Human-readable algorithm identifier (e.g. "HMAC-SHA-256").

fn key_len(&self) -> usize

Required key length (minimum acceptable length; MACs are often variable).

fn output_len(&self) -> usize

Output tag length in bytes.

fn mac(&self, key: &[u8], msg: &[u8], out: &mut [u8]) -> Result<(), CryptoError>

Compute a MAC tag for msg under key and write it into out.

fn verify(&self, key: &[u8], msg: &[u8], tag: &[u8]) -> Result<(), CryptoError>

Verify a MAC tag in constant time.

fn mac_to_vec(&self, key: &[u8], msg: &[u8]) -> Result<Vec<u8>, CryptoError>

Convenience: compute MAC and return the tag as a Vec<u8>.

impl Copy for HmacSha256