Struct curve25519_dalek::edwards::CompressedEdwardsY

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

In "Edwards y" / "Ed25519" format, the curve point \((x,y)\) is determined by the \(y\)-coordinate and the sign of \(x\).

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 as_bytes(&self) -> &[u8; 32]

View this CompressedEdwardsY as an array of bytes.

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

Copy this CompressedEdwardsY to an array of bytes.

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.

impl CompressedEdwardsY

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

Construct a CompressedEdwardsY from a slice of bytes.

Panics

If the input bytes slice does not have a length of 32.

Trait Implementations

impl Copy for CompressedEdwardsY

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 Eq for CompressedEdwardsY

impl PartialEq for CompressedEdwardsY

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

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

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

This method tests for !=.

impl Debug for CompressedEdwardsY

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

Formats the value using the given formatter.

impl Identity for CompressedEdwardsY

fn identity() -> CompressedEdwardsY

Returns the identity element of the curve. Can be used as a constructor.

impl Default for CompressedEdwardsY

fn default() -> CompressedEdwardsY

Returns the "default value" for a type.