Struct ghash::GHash

pub struct GHash(pub(crate) Polyval);

GHASH: universal hash over GF(2^128) used by AES-GCM.

GHASH is a universal hash function used for message authentication in the AES-GCM authenticated encryption cipher.

Tuple Fields

0: Polyval

Implementations

impl GHash

pub fn new_with_init_block(h: &Key, init_block: u128) -> Self

Initialize GHASH with the given H field element and initial block

Trait Implementations

impl BlockSizeUser for GHash

type BlockSize = UInt<UInt<UInt<UInt<UInt<UTerm, B1>, B0>, B0>, B0>, B0>

Size of the block in bytes.

fn block_size() -> usize

Return block size in bytes.

impl Clone for GHash

fn clone(&self) -> GHash

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for GHash

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

Formats the value using the given formatter.

impl KeyInit for GHash

fn new(h: &Key) -> Self

Initialize GHASH with the given H field element

fn new_from_slice(key: &[u8]) -> Result<Self, InvalidLength>

Create new value from variable size key.

fn generate_key( rng: impl CryptoRng + RngCore, ) -> GenericArray<u8, Self::KeySize>

Generate random key using the provided CryptoRng.

impl KeySizeUser for GHash

type KeySize = UInt<UInt<UInt<UInt<UInt<UTerm, B1>, B0>, B0>, B0>, B0>

Key size in bytes.

fn key_size() -> usize

Return key size in bytes.

impl UniversalHash for GHash

fn finalize(self) -> Tag

Get GHASH output

fn update_with_backend( &mut self, f: impl UhfClosure<BlockSize = Self::BlockSize>, )

Update hash function state using the provided rank-2 closure.

fn update(&mut self, blocks: &[GenericArray<u8, Self::BlockSize>])

Update hash function state with the provided block.

fn update_padded(&mut self, data: &[u8])

Input data into the universal hash function. If the length of the data is not a multiple of the block size, the remaining data is padded with zeroes up to the BlockSize.

fn verify( self, expected: &GenericArray<u8, Self::BlockSize>, ) -> Result<(), Error>

Verify the UniversalHash of the processed input matches a given expected value.