io.nem.core.crypto.ed25519.arithmetic

Class Ed25519EncodedGroupElement

java.lang.Object

io.nem.core.crypto.ed25519.arithmetic.Ed25519EncodedGroupElement

public class Ed25519EncodedGroupElement
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
Ed25519EncodedGroupElement(byte[] values) Creates a new encoded group element.

Method Summary

Modifier and Type	Method and Description
Ed25519GroupElement	decode() Decodes this encoded group element and returns a new group element in P3 coordinates.
boolean	equals(java.lang.Object obj)
Ed25519FieldElement	getAffineX() Gets the affine x-coordinate.
Ed25519FieldElement	getAffineY() Gets the affine y-coordinate.
byte[]	getRaw() Gets the underlying byte array.
int	hashCode()
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Ed25519EncodedGroupElement

public Ed25519EncodedGroupElement(byte[] values)

Creates a new encoded group element.

Parameters:

values - The values.

Method Detail

getRaw

public byte[] getRaw()

Gets the underlying byte array.

Returns:

The byte array.

decode

public Ed25519GroupElement decode()

Decodes this encoded group element and returns a new group element in P3 coordinates.

Returns:

The group element.

getAffineX

public Ed25519FieldElement getAffineX()

Gets the affine x-coordinate. x is recovered in the following way (p = field size):
x = sign(x) * sqrt((y^2 - 1) / (d * y^2 + 1)) = sign(x) * sqrt(u / v) with u = y^2 - 1 and v = d * y^2 + 1. Setting β = (u * v^3) * (u * v^7)^((p - 5) / 8) one has β^2 = +-(u / v). If v * β = -u multiply β with i=sqrt(-1). Set x := β. If sign(x) != bit 255 of s then negate x.

Returns:

the affine x-coordinate.

getAffineY

public Ed25519FieldElement getAffineY()

Gets the affine y-coordinate.

Returns:

the affine y-coordinate.

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object