Struct zerocaf::edwards::CompressedEdwardsY

pub struct CompressedEdwardsY(pub [u8; 32]);

The first 255 bits of a CompressedEdwardsY represent the (y)-coordinate. The high bit of the 32nd byte gives the sign of (x).

Methods

impl CompressedEdwardsY

pub fn from_slice(bytes: &[u8]) -> CompressedEdwardsY

Construct a CompressedEdwardsY from a slice of bytes.

Note:

This function should only be used to get a CompressedEdwardsY compressed point from a [u8; 32] that we know that is already a compressed point.

If this function is used with Y-coordinates randomly might give errors.

pub fn to_bytes(&self) -> [u8; 32]

Return the CompressedEdwardsY as an array of bytes (it's cannonical state).

pub fn decompress(&self) -> Option<EdwardsPoint>

Attempt to decompress to an EdwardsPoint.

Returns None if the input is not the Y-coordinate of a curve point.

Trait Implementations

impl Clone for CompressedEdwardsY

fn clone(&self) -> CompressedEdwardsY

Returns a copy of the value.

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

Performs copy-assignment from source.

impl ConstantTimeEq for CompressedEdwardsY

fn ct_eq(&self, other: &CompressedEdwardsY) -> Choice

Determine if two items are equal.

impl Copy for CompressedEdwardsY

impl Debug for CompressedEdwardsY

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Default for CompressedEdwardsY

fn default() -> CompressedEdwardsY

Returns the identity for CompressedEdwardsY point.

impl Eq for CompressedEdwardsY

impl Identity for CompressedEdwardsY

fn identity() -> CompressedEdwardsY

Returns the CompressedEdwardsY identity point value that corresponds to 1 (mod l) with the x-sign bit setted to 0.

impl Index<usize> for CompressedEdwardsY

type Output = u8

The returned type after indexing.

fn index(&self, _index: usize) -> &u8

Performs the indexing (container[index]) operation.

impl IndexMut<usize> for CompressedEdwardsY

fn index_mut(&mut self, _index: usize) -> &mut u8

Performs the mutable indexing (container[index]) operation.

impl<'a> Neg for &'a CompressedEdwardsY

type Output = CompressedEdwardsY

The resulting type after applying the - operator.

fn neg(self) -> CompressedEdwardsY

Negates an CompressedEdwardsY by decompressing it, negating over Twisted Edwards Extended Projective Coordinates and compressing it back.

impl Neg for CompressedEdwardsY

type Output = CompressedEdwardsY

The resulting type after applying the - operator.

fn neg(self) -> CompressedEdwardsY

Negates an CompressedEdwardsY by decompressing it, negating over Twisted Edwards Extended Projective Coordinates and compressing it back.

impl PartialEq<CompressedEdwardsY> for CompressedEdwardsY

fn eq(&self, other: &CompressedEdwardsY) -> bool

This method tests for self and other values to be equal, and is used by ==.

#[must_use] fn ne(&self, other: &Rhs) -> bool

This method tests for !=.