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.

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 timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

 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`.

 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 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.

 public BigInteger getA ()

Returns the first coefficient a of the elliptic curve.

Returns
`BigInteger`	the first coefficient `a`.

 public BigInteger getB ()

Returns the second coefficient b of the elliptic curve.

Returns
`BigInteger`	the second coefficient `b`.

 public ECField getField ()

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

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

 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.

 public int hashCode ()

Returns a hash code value for this elliptic curve.

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)`