it.unisa.dia.gas.jpbc

Interface Point<E extends Element>

All Superinterfaces:

Element, ElementPow, Vector<E>

public interface Point<E extends Element>
extends Element, Vector<E>

This interface represents an element with two coordinates. (A point over an elliptic curve).

Since:

1.0.0

Author:

Angelo De Caro (jpbclib@gmail.com)

See Also:

Element, Vector

Method Summary

Methods

Modifier and Type	Method and Description
int	getLengthInBytesCompressed() Returns the length in bytes needed to represent this element in a compressed way.
int	getLengthInBytesX() Returns the length in bytes needed to represent the x coordinate of this element.
E	getX() Returns the x-coordinate.
E	getY() Returns the y-coordinate.
int	setFromBytesCompressed(byte[] source) Reads this element from the buffer source.
int	setFromBytesCompressed(byte[] source, int offset) Reads the x-coordinate from the buffer source staring from the passed offset.
int	setFromBytesX(byte[] source) Reads the x-coordinate from the buffer source.
int	setFromBytesX(byte[] source, int offset) Reads the x-coordinate from the buffer source staring from the passed offset.
byte[]	toBytesCompressed() Converts this element to bytes.
byte[]	toBytesX() Converts the x-coordinate to bytes.

Methods inherited from interface it.unisa.dia.gas.jpbc.Vector

getAt, getSize

Methods inherited from interface it.unisa.dia.gas.jpbc.Element

add, div, duplicate, getElementPowPreProcessing, getField, getImmutable, getLengthInBytes, halve, invert, isEqual, isImmutable, isOne, isSqr, isZero, mul, mul, mul, mulZn, negate, pow, powZn, set, set, set, setFromBytes, setFromBytes, setFromHash, setToOne, setToRandom, setToZero, sign, sqrt, square, sub, toBigInteger, toBytes, toCanonicalRepresentation, twice

Method Detail

getX

E getX()

Returns the x-coordinate.

Returns:

the x-coordinate.

Since:

1.0.0

getY

E getY()

Returns the y-coordinate.

Returns:

the y-coordinate.

Since:

1.0.0

getLengthInBytesCompressed

int getLengthInBytesCompressed()

Returns the length in bytes needed to represent this element in a compressed way.

Returns:

the length in bytes needed to represent this element in a compressed way.

toBytesCompressed

byte[] toBytesCompressed()

Converts this element to bytes. The number of bytes it will write can be determined calling getLengthInBytesCompressed().

Returns:

the bytes written.

Since:

1.0.0

setFromBytesCompressed

int setFromBytesCompressed(byte[] source)

Reads this element from the buffer source. staring from the passed offset.

Parameters:

source - the source of bytes.

Returns:

the number of bytes read.

Since:

1.0.0

setFromBytesCompressed

int setFromBytesCompressed(byte[] source,
                         int offset)

Reads the x-coordinate from the buffer source staring from the passed offset. The y-coordinate is then recomputed. Pay attention. the y-coordinate could be different from the element which originates the buffer source.

Parameters:

source - the source of bytes.

offset - the starting offset.

Returns:

the number of bytes read.

Since:

1.0.0

getLengthInBytesX

int getLengthInBytesX()

Returns the length in bytes needed to represent the x coordinate of this element.

Returns:

the length in bytes needed to represent the x coordinate of this element.

Since:

1.0.0

toBytesX

byte[] toBytesX()

Converts the x-coordinate to bytes. The number of bytes it will write can be determined calling getLengthInBytesX().

Returns:

the bytes written.

Since:

1.0.0

setFromBytesX

int setFromBytesX(byte[] source)

Reads the x-coordinate from the buffer source. The y-coordinate is then recomputed. Pay attention. the y-coordinate could be different from the element which originates the buffer source.

Parameters:

source - the source of bytes.

Returns:

the number of bytes read.

Since:

1.0.0

setFromBytesX

int setFromBytesX(byte[] source,
                int offset)

Reads the x-coordinate from the buffer source staring from the passed offset. The y-coordinate is then recomputed. Pay attention. the y-coordinate could be different from the element which originates the buffer source.

Parameters:

source - the source of bytes.

offset - the starting offset.

Returns:

the number of bytes read.

Since:

1.0.0