ECPoint
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This immutable class represents a point on an elliptic curve (EC)
in affine coordinates. Other coordinate systems can
extend this class to represent this point in other
coordinates.
Public Constructor Summary
|
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ECPoint(BigInteger x, BigInteger y)
Creates an ECPoint from the specified affine x-coordinate
x and affine y-coordinate y.
|
Public Method Summary
|
boolean
|
equals( Object obj)
Compares this elliptic curve point for equality with
the specified object.
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BigInteger
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BigInteger
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|
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int
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hashCode()
Returns a hash code value for this elliptic curve point.
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Inherited Method Summary
From class
java.lang.Object
|
Object
|
clone()
Creates and returns a copy of this Object.
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boolean
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equals( Object obj)
Compares this instance with the specified object and indicates if they
are equal.
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void
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finalize()
Invoked when the garbage collector has detected that this instance is no longer reachable.
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final
Class<?>
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getClass()
Returns the unique instance of Class that represents this
object's class.
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int
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hashCode()
Returns an integer hash code for this object.
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final
void
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notify()
Causes a thread which is waiting on this object's monitor (by means of
calling one of the wait() methods) to be woken up.
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final
void
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notifyAll()
Causes all threads which are waiting on this object's monitor (by means
of calling one of the wait() methods) to be woken up.
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String
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toString()
Returns a string containing a concise, human-readable description of this
object.
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final
void
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wait(long timeout, int nanos)
Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the
specified timeout expires.
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final
void
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wait(long timeout)
Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the
specified timeout expires.
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final
void
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wait()
Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.
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Fields
public
static
final
ECPoint
POINT_INFINITY
This defines the point at infinity.
Public Constructors
public
ECPoint
(BigInteger x, BigInteger y)
Creates an ECPoint from the specified affine x-coordinate
x and affine y-coordinate y.
Parameters
| x |
the affine x-coordinate. |
| y |
the affine y-coordinate. |
Public Methods
public
boolean
equals
(Object obj)
Compares this elliptic curve point for equality with
the specified object.
Parameters
| obj |
the object to be compared. |
Returns
- true if
obj is an instance of
ECPoint and the affine coordinates match, false otherwise.
public
BigInteger
getAffineX
()
Returns the affine x-coordinate x.
Note: POINT_INFINITY has a null affine x-coordinate.
public
BigInteger
getAffineY
()
Returns the affine y-coordinate y.
Note: POINT_INFINITY has a null affine y-coordinate.
public
int
hashCode
()
Returns a hash code value for this elliptic curve point.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2024-07-10 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-07-10 UTC."],[[["\u003cp\u003e\u003ccode\u003eECPoint\u003c/code\u003e is an immutable class representing a point on an elliptic curve using affine coordinates.\u003c/p\u003e\n"],["\u003cp\u003eIt includes a constant \u003ccode\u003ePOINT_INFINITY\u003c/code\u003e for the point at infinity.\u003c/p\u003e\n"],["\u003cp\u003eAn \u003ccode\u003eECPoint\u003c/code\u003e can be constructed using affine x and y coordinates (\u003ccode\u003eBigInteger\u003c/code\u003e values).\u003c/p\u003e\n"],["\u003cp\u003eMethods are provided to get the affine coordinates and to check for equality with other \u003ccode\u003eECPoint\u003c/code\u003e objects.\u003c/p\u003e\n"],["\u003cp\u003eIt inherits methods from \u003ccode\u003eObject\u003c/code\u003e for standard object operations like \u003ccode\u003eequals\u003c/code\u003e, \u003ccode\u003ehashCode\u003c/code\u003e, and \u003ccode\u003etoString\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,["public class **ECPoint** extends [Object](../../../../reference/java/lang/Object.html) \nThis immutable class represents a point on an elliptic curve (EC)\nin affine coordinates. Other coordinate systems can\nextend this class to represent this point in other\ncoordinates. \n\nField Summary\n\n|--------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------|-------------------------------------|\n| public static final [ECPoint](../../../../reference/java/security/spec/ECPoint.html) | [POINT_INFINITY](../../../../reference/java/security/spec/ECPoint.html#POINT_INFINITY) | This defines the point at infinity. |\n\nPublic Constructor Summary\n\n|---|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| | [ECPoint](../../../../reference/java/security/spec/ECPoint.html#ECPoint(java.math.BigInteger,%20java.math.BigInteger))(BigInteger x, BigInteger y) Creates an ECPoint from the specified affine x-coordinate `x` and affine y-coordinate `y`. |\n\nPublic Method Summary\n\n|------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| boolean | [equals](../../../../reference/java/security/spec/ECPoint.html#equals(java.lang.Object))([Object](../../../../reference/java/lang/Object.html) obj) Compares this elliptic curve point for equality with the specified object. |\n| BigInteger | [getAffineX](../../../../reference/java/security/spec/ECPoint.html#getAffineX())() Returns the affine x-coordinate `x`. |\n| BigInteger | [getAffineY](../../../../reference/java/security/spec/ECPoint.html#getAffineY())() Returns the affine y-coordinate `y`. |\n| int | [hashCode](../../../../reference/java/security/spec/ECPoint.html#hashCode())() Returns a hash code value for this elliptic curve point. |\n\nInherited Method Summary \nFrom class [java.lang.Object](../../../../reference/java/lang/Object.html) \n\n|----------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| [Object](../../../../reference/java/lang/Object.html) | [clone](../../../../reference/java/lang/Object.html#clone())() Creates and returns a copy of this `Object`. |\n| boolean | [equals](../../../../reference/java/lang/Object.html#equals(java.lang.Object))([Object](../../../../reference/java/lang/Object.html) obj) Compares this instance with the specified object and indicates if they are equal. |\n| void | [finalize](../../../../reference/java/lang/Object.html#finalize())() Invoked when the garbage collector has detected that this instance is no longer reachable. |\n| final [Class](../../../../reference/java/lang/Class.html)\\\u003c?\\\u003e | [getClass](../../../../reference/java/lang/Object.html#getClass())() Returns the unique instance of [Class](../../../../reference/java/lang/Class.html) that represents this object's class. |\n| int | [hashCode](../../../../reference/java/lang/Object.html#hashCode())() Returns an integer hash code for this object. |\n| final void | [notify](../../../../reference/java/lang/Object.html#notify())() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up. |\n| final void | [notifyAll](../../../../reference/java/lang/Object.html#notifyAll())() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up. |\n| [String](../../../../reference/java/lang/String.html) | [toString](../../../../reference/java/lang/Object.html#toString())() Returns a string containing a concise, human-readable description of this object. |\n| final void | [wait](../../../../reference/java/lang/Object.html#wait(long,%20int))(long timeout, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires. |\n| final void | [wait](../../../../reference/java/lang/Object.html#wait(long))(long timeout) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires. |\n| final void | [wait](../../../../reference/java/lang/Object.html#wait())() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object. |\n\nFields \n\npublic static final ECPoint\n**POINT_INFINITY** \nThis defines the point at infinity.\n\nPublic Constructors \n\npublic\n**ECPoint**\n(BigInteger x, BigInteger y) \nCreates an ECPoint from the specified affine x-coordinate\n`x` and affine y-coordinate `y`. \n\nParameters\n\n| x | the affine x-coordinate. |\n| y | the affine y-coordinate. |\n|---|--------------------------|\n\nThrows\n\n| [NullPointerException](../../../../reference/java/lang/NullPointerException.html) | if `x` or `y` is null. |\n|-----------------------------------------------------------------------------------|------------------------|\n\nPublic Methods \n\npublic boolean\n**equals**\n([Object](../../../../reference/java/lang/Object.html) obj) \nCompares this elliptic curve point for equality with\nthe specified object. \n\nParameters\n\n| obj | the object to be compared. |\n|-----|----------------------------|\n\nReturns\n\n- true if `obj` is an instance of ECPoint and the affine coordinates match, false otherwise. \n\npublic BigInteger\n**getAffineX**\n() \nReturns the affine x-coordinate `x`.\nNote: POINT_INFINITY has a null affine x-coordinate. \n\nReturns\n\n- the affine x-coordinate. \n\npublic BigInteger\n**getAffineY**\n() \nReturns the affine y-coordinate `y`.\nNote: POINT_INFINITY has a null affine y-coordinate. \n\nReturns\n\n- the affine y-coordinate. \n\npublic int\n**hashCode**\n() \nReturns a hash code value for this elliptic curve point. \n\nReturns\n\n- a hash code value."]]
