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java.lang.Objectjava.security.spec.EllipticCurve
public class EllipticCurve
This immutable class holds the necessary values needed to represent an elliptic curve.
ECField,
ECFieldFp,
ECFieldF2m| Constructor Summary | |
|---|---|
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. |
|
| Method Summary | |
|---|---|
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. |
| Methods inherited from class java.lang.Object |
|---|
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public EllipticCurve(ECField field,
BigInteger a,
BigInteger b)
field and the coefficients a and
b.
field - the finite field that this elliptic curve is over.a - the first coefficient of this elliptic curve.b - the second coefficient of this elliptic curve.
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)
field, the coefficients a and
b, and the seed used for curve generation.
field - the finite field that this elliptic curve is over.a - the first coefficient of this elliptic curve.b - the second coefficient of this elliptic curve.seed - the bytes used during curve generation for later
validation. Contents of this array are copied to protect against
subsequent modification.
NullPointerException - if field,
a, or b is null.
IllegalArgumentException - if a
or b is not null and not in field.| Method Detail |
|---|
public ECField getField()
field that this
elliptic curve is over.
field that this curve
is over.public BigInteger getA()
a of the
elliptic curve.
a.public BigInteger getB()
b of the
elliptic curve.
b.public byte[] getSeed()
seed used
during curve generation. May be null if not specified.
seed. A new
array is returned each time this method is called.public boolean equals(Object obj)
equals in class Objectobj - the object to be compared.
obj is an instance of
EllipticCurve and the field, A, B, and seeding bytes
match, false otherwise.Object.hashCode(),
Hashtablepublic int hashCode()
hashCode in class ObjectObject.equals(java.lang.Object),
Hashtable
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Java™ Platform Standard Ed. 6 |
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