Trait digest::core_api::VariableOutputCore

pub trait VariableOutputCore: UpdateCore + OutputSizeUser + BufferKindUser + Sized where
    Self::BlockSize: IsLess<U256>,
    Le<Self::BlockSize, U256>: NonZero, {
    const TRUNC_SIDE: TruncSide;

    fn new(output_size: usize) -> Result<Self, InvalidOutputSize>;
    fn finalize_variable_core(
        &mut self, 
        buffer: &mut Buffer<Self>, 
        out: &mut Output<Self>
    );
}

This is supported on crate feature core-api only.

Core trait for hash functions with variable output size.

Maximum output size is equal to OutputSizeUser::OutputSize. Users are expected to truncate result returned by the finalize_variable_core to output_size passed to the new method during construction. Truncation side is defined by the TRUNC_SIDE associated constant.

Associated Constants

const TRUNC_SIDE: TruncSide

Side which should be used in a truncated result.

Required methods

fn new(output_size: usize) -> Result<Self, InvalidOutputSize>

Initialize hasher state for given output size.

Returns InvalidOutputSize if output_size is not valid for the algorithm, e.g. if it’s bigger than the OutputSize associated type.

fn finalize_variable_core(
    &mut self,
    buffer: &mut Buffer<Self>,
    out: &mut Output<Self>
)

Finalize hasher and write full hashing result into the out buffer.

The result must be truncated to output_size used during hasher construction. Truncation side is defined by the TRUNC_SIDE associated constant.

Implementors