org.bitcoinj.crypto

Class LazyECPoint

java.lang.Object

org.bitcoinj.crypto.LazyECPoint

public class LazyECPoint
extends java.lang.Object

A wrapper around ECPoint that delays decoding of the point for as long as possible. This is useful because point encode/decode in Bouncy Castle is quite slow especially on Dalvik, as it often involves decompression/recompression.

Constructor Summary

Constructors

Constructor and Description
LazyECPoint(org.bouncycastle.math.ec.ECCurve curve, byte[] bits) Construct a LazyECPoint from a public key.
LazyECPoint(org.bouncycastle.math.ec.ECPoint point, boolean compressed) Construct a LazyECPoint from an already decoded point.

Method Summary

Modifier and Type	Method and Description
org.bouncycastle.math.ec.ECPoint	add(org.bouncycastle.math.ec.ECPoint b)
LazyECPoint	compress() Returns a compressed version of this elliptic curve point.
LazyECPoint	decompress() Returns a decompressed version of this elliptic curve point.
boolean	equals(org.bouncycastle.math.ec.ECPoint other)
boolean	equals(java.lang.Object o)
org.bouncycastle.math.ec.ECPoint	get()
org.bouncycastle.math.ec.ECFieldElement	getAffineXCoord()
org.bouncycastle.math.ec.ECFieldElement	getAffineYCoord()
org.bouncycastle.math.ec.ECCurve	getCurve()
org.bouncycastle.math.ec.ECPoint	getDetachedPoint()
byte[]	getEncoded()
byte[]	getEncoded(boolean compressed)
org.bouncycastle.math.ec.ECFieldElement	getX()
org.bouncycastle.math.ec.ECFieldElement	getXCoord()
org.bouncycastle.math.ec.ECFieldElement	getY()
org.bouncycastle.math.ec.ECFieldElement	getYCoord()
org.bouncycastle.math.ec.ECFieldElement	getZCoord(int index)
org.bouncycastle.math.ec.ECFieldElement[]	getZCoords()
int	hashCode()
boolean	isCompressed()
boolean	isInfinity()
boolean	isNormalized()
boolean	isValid()
org.bouncycastle.math.ec.ECPoint	multiply(java.math.BigInteger k)
org.bouncycastle.math.ec.ECPoint	negate()
org.bouncycastle.math.ec.ECPoint	normalize()
org.bouncycastle.math.ec.ECPoint	scaleX(org.bouncycastle.math.ec.ECFieldElement scale)
org.bouncycastle.math.ec.ECPoint	scaleY(org.bouncycastle.math.ec.ECFieldElement scale)
org.bouncycastle.math.ec.ECPoint	subtract(org.bouncycastle.math.ec.ECPoint b)
org.bouncycastle.math.ec.ECPoint	threeTimes()
org.bouncycastle.math.ec.ECPoint	timesPow2(int e)
org.bouncycastle.math.ec.ECPoint	twice()
org.bouncycastle.math.ec.ECPoint	twicePlus(org.bouncycastle.math.ec.ECPoint b)

Methods inherited from class java.lang.Object

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

Constructor Detail

LazyECPoint

public LazyECPoint(org.bouncycastle.math.ec.ECCurve curve,
                   byte[] bits)

Construct a LazyECPoint from a public key. Due to the delayed decoding of the point the validation of the public key is delayed too, e.g. until a getter is called.

Parameters:

curve - a curve the point is on

bits - public key bytes

LazyECPoint

public LazyECPoint(org.bouncycastle.math.ec.ECPoint point,
                   boolean compressed)

Construct a LazyECPoint from an already decoded point.

Parameters:

point - the wrapped point

compressed - true if the represented public key is compressed

Method Detail

compress

public LazyECPoint compress()

Returns a compressed version of this elliptic curve point. Returns the same point if it's already compressed. See the ECKey class docs for a discussion of point compression.

decompress

public LazyECPoint decompress()

Returns a decompressed version of this elliptic curve point. Returns the same point if it's already compressed. See the ECKey class docs for a discussion of point compression.

get

public org.bouncycastle.math.ec.ECPoint get()

getEncoded

public byte[] getEncoded()

getDetachedPoint

public org.bouncycastle.math.ec.ECPoint getDetachedPoint()

isInfinity

public boolean isInfinity()

timesPow2

public org.bouncycastle.math.ec.ECPoint timesPow2(int e)

getYCoord

public org.bouncycastle.math.ec.ECFieldElement getYCoord()

getZCoords

public org.bouncycastle.math.ec.ECFieldElement[] getZCoords()

isNormalized

public boolean isNormalized()

isCompressed

public boolean isCompressed()

multiply

public org.bouncycastle.math.ec.ECPoint multiply(java.math.BigInteger k)

subtract

public org.bouncycastle.math.ec.ECPoint subtract(org.bouncycastle.math.ec.ECPoint b)

isValid

public boolean isValid()

scaleY

public org.bouncycastle.math.ec.ECPoint scaleY(org.bouncycastle.math.ec.ECFieldElement scale)

getXCoord

public org.bouncycastle.math.ec.ECFieldElement getXCoord()

scaleX

public org.bouncycastle.math.ec.ECPoint scaleX(org.bouncycastle.math.ec.ECFieldElement scale)

equals

public boolean equals(org.bouncycastle.math.ec.ECPoint other)

negate

public org.bouncycastle.math.ec.ECPoint negate()

threeTimes

public org.bouncycastle.math.ec.ECPoint threeTimes()

getZCoord

public org.bouncycastle.math.ec.ECFieldElement getZCoord(int index)

getEncoded

public byte[] getEncoded(boolean compressed)

add

public org.bouncycastle.math.ec.ECPoint add(org.bouncycastle.math.ec.ECPoint b)

twicePlus

public org.bouncycastle.math.ec.ECPoint twicePlus(org.bouncycastle.math.ec.ECPoint b)

getCurve

public org.bouncycastle.math.ec.ECCurve getCurve()

normalize

public org.bouncycastle.math.ec.ECPoint normalize()

getY

public org.bouncycastle.math.ec.ECFieldElement getY()

twice

public org.bouncycastle.math.ec.ECPoint twice()

getAffineYCoord

public org.bouncycastle.math.ec.ECFieldElement getAffineYCoord()

getAffineXCoord

public org.bouncycastle.math.ec.ECFieldElement getAffineXCoord()

getX

public org.bouncycastle.math.ec.ECFieldElement getX()

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object