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EllipticCurve

public class EllipticCurve
extends Object

java.lang.Object
↳	java.security.spec.EllipticCurve

This immutable class holds the necessary values needed to represent an elliptic curve.

See also:

Summary

Public constructors
`EllipticCurve(ECField field, BigInteger a, BigInteger b)` Creates an elliptic curve with the specified elliptic field `field` and the coefficients `a` and `b`.
`EllipticCurve(ECField field, BigInteger a, BigInteger b, byte[] seed)` Creates an elliptic curve with the specified elliptic field `field`, the coefficients `a` and `b`, and the `seed` used for curve generation.

Public methods
`boolean`	`equals(Object obj)` Compares this elliptic curve for equality with the specified object.
`BigInteger`	`getA()` Returns the first coefficient `a` of the elliptic curve.
`BigInteger`	`getB()` Returns the second coefficient `b` of the elliptic curve.
`ECField`	`getField()` Returns the finite field `field` that this elliptic curve is over.
`byte[]`	`getSeed()` Returns the seeding bytes `seed` used during curve generation.
`int`	`hashCode()` Returns a hash code value for this elliptic curve.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Public constructors

EllipticCurve

public EllipticCurve (ECField field, 
                BigInteger a, 
                BigInteger b)

Creates an elliptic curve with the specified elliptic field field and the coefficients a and b.

Parameters
`field`	`ECField`: the finite field that this elliptic curve is over.
`a`	`BigInteger`: the first coefficient of this elliptic curve.
`b`	`BigInteger`: the second coefficient of this elliptic curve.

Throws
`NullPointerException`	if `field`, `a`, or `b` is null.
`IllegalArgumentException`	if `a` or `b` is not null and not in `field`.

EllipticCurve

public EllipticCurve (ECField field, 
                BigInteger a, 
                BigInteger b, 
                byte[] seed)

Creates an elliptic curve with the specified elliptic field field, the coefficients a and b, and the seed used for curve generation.

Parameters
`field`	`ECField`: the finite field that this elliptic curve is over.
`a`	`BigInteger`: the first coefficient of this elliptic curve.
`b`	`BigInteger`: the second coefficient of this elliptic curve.
`seed`	`byte`: the bytes used during curve generation for later validation. Contents of this array are copied to protect against subsequent modification.

Throws
`NullPointerException`	if `field`, `a`, or `b` is null.
`IllegalArgumentException`	if `a` or `b` is not null and not in `field`.

Public methods

equals

public boolean equals (Object obj)

Compares this elliptic curve for equality with the specified object.

Parameters
`obj`	`Object`: the object to be compared.

Returns
`boolean`	true if `obj` is an instance of EllipticCurve and the field, A, and B match, false otherwise.

getA

public BigInteger getA ()

Returns the first coefficient a of the elliptic curve.

Returns
`BigInteger`	the first coefficient `a`.

getB

public BigInteger getB ()

Returns the second coefficient b of the elliptic curve.

Returns
`BigInteger`	the second coefficient `b`.

getField

public ECField getField ()

Returns the finite field field that this elliptic curve is over.

Returns
`ECField`	the field `field` that this curve is over.

getSeed

public byte[] getSeed ()

Returns the seeding bytes seed used during curve generation. May be null if not specified.

Returns
`byte[]`	the seeding bytes `seed`. A new array is returned each time this method is called.

hashCode

public int hashCode ()

Returns a hash code value for this elliptic curve.

Returns

Returns
`int`	a hash code value computed from the hash codes of the field, A, and B, as follows: `(field.hashCode() << 6) + (a.hashCode() << 4) + (b.hashCode() << 2)`

int

a hash code value computed from the hash codes of the field, A, and B, as follows:

(field.hashCode() << 6) + (a.hashCode() << 4) + (b.hashCode() << 2)

Interfaces

Classes

Exceptions

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EllipticCurve

Summary

Public constructors

Public methods

Inherited methods

Public constructors

EllipticCurve

EllipticCurve

Public methods

equals

getA

getB

getField

getSeed

hashCode