bee-crypto 0.3.0

// Copyright 2020-2021 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0

//! Binary representation of big integers.

use crate::ternary::bigint::sealed::Sealed;

/// The number of bits in an U384/I384.
pub const BINARY_LEN: usize = 384;

/// Binary representation of a big integer.
pub trait BinaryRepresentation: Sealed + Clone {
    /// Inner representation type of the big integer.
    type Inner;

    /// Iterates over a slice of the inner representation type of the big integer.
    fn iter(&self) -> std::slice::Iter<'_, Self::Inner>;
}

/// The number of `u8`s in an U384/I384.
pub const BINARY_LEN_IN_U8: usize = BINARY_LEN / 8; // 48

/// The inner representation of an U384/I384 using `BINARY_LEN_IN_U8` `u8`s.
pub type U8Repr = [u8; BINARY_LEN_IN_U8];

impl Sealed for U8Repr {}

impl BinaryRepresentation for U8Repr {
    type Inner = u8;

    fn iter(&self) -> std::slice::Iter<'_, Self::Inner> {
        (self as &[Self::Inner]).iter()
    }
}

/// The number of `u32`s in an U384/I384.
pub const BINARY_LEN_IN_U32: usize = BINARY_LEN / 32; // 12

/// The inner representation of an U384/I384 using `BINARY_LEN_IN_U32` `u32`s.
pub type U32Repr = [u32; BINARY_LEN_IN_U32];

impl Sealed for U32Repr {}

impl BinaryRepresentation for U32Repr {
    type Inner = u32;

    fn iter(&self) -> std::slice::Iter<'_, Self::Inner> {
        (self as &[Self::Inner]).iter()
    }
}