Trait universal_hash::UniversalHash

pub trait UniversalHash: Clone {
    type BlockSize: ArrayLength<u8>;

    fn update(&mut self, block: &Block<Self>);
    fn reset(&mut self);
    fn finalize(self) -> Output<Self>;

    fn update_padded(&mut self, data: &[u8]) { ... }
    fn finalize_reset(&mut self) -> Output<Self> { ... }
    fn verify(self, other: &Block<Self>) -> Result<(), Error> { ... }
}

The UniversalHash trait defines a generic interface for universal hash functions.

Required Associated Types

type BlockSize: ArrayLength<u8>

Size of the inputs to and outputs from the universal hash function

Required Methods

fn update(&mut self, block: &Block<Self>)

Input a block into the universal hash function

fn reset(&mut self)

Reset UniversalHash instance.

fn finalize(self) -> Output<Self>

Obtain the Output of a UniversalHash function and consume it.

Provided Methods

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.

This approach is frequently used by AEAD modes which use Message Authentication Codes (MACs) based on universal hashing.

fn finalize_reset(&mut self) -> Output<Self>

Obtain the Output of a UniversalHash computation and reset it back to its initial state.

fn verify(self, other: &Block<Self>) -> Result<(), Error>

Verify the UniversalHash of the processed input matches a given Output. This is useful when constructing Message Authentication Codes (MACs) from universal hash functions.

Implementors