Trait ExpandMsg 

pub trait ExpandMsg<K> {
    type Hash;
    type Expander<'dst>: Expander + Sized;
    type Error: Error;

    // Required method
    fn expand_message<'dst>(
        msg: &[&[u8]],
        dst: &'dst [&[u8]],
        len_in_bytes: NonZero<u16>,
    ) -> Result<Self::Expander<'dst>, Self::Error>;
}

Trait for types implementing expand_message interface for hash_to_field.

K is the target security level in bytes: https://www.rfc-editor.org/rfc/rfc9380.html#section-8.9-2.2 https://www.rfc-editor.org/rfc/rfc9380.html#name-target-security-levels

Errors

See implementors of ExpandMsg for errors.

Required Associated Types

type Hash

The hash used by this implementation.

type Expander<'dst>: Expander + Sized

Type holding data for the Expander.

type Error: Error

Error returned by ExpandMsg::expand_message.

Required Methods

fn expand_message<'dst>( msg: &[&[u8]], dst: &'dst [&[u8]], len_in_bytes: NonZero<u16>, ) -> Result<Self::Expander<'dst>, Self::Error>

Expands msg to the required number of bytes.

Returns an expander that can be used to call read until enough bytes have been consumed

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<HashT, K> ExpandMsg<K> for ExpandMsgXmd<HashT>

where HashT: BlockSizeUser + Default + FixedOutput + HashMarker, HashT::OutputSize: IsLessOrEqual<HashT::BlockSize, Output = True> + IsGreaterOrEqual<Prod<K, U2>, Output = True>, K: Mul<U2>,

type Hash = HashT

type Expander<'dst> = ExpanderXmd<'dst, HashT>

type Error = ExpandMsgXmdError

impl<HashT, K> ExpandMsg<K> for ExpandMsgXof<HashT>

where HashT: Default + ExtendableOutput + Update + HashMarker + CollisionResistance<CollisionResistance: IsGreaterOrEqual<K, Output = True>>, K: Mul<U2, Output: ArraySize>,

type Hash = HashT

type Expander<'dst> = ExpandMsgXof<HashT>

type Error = ExpandMsgXofError