public class EllipticCurve extends Object
ECField
,
ECFieldFp
,
ECFieldF2m
Constructor | Description |
---|---|
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. |
Modifier and Type | Method | Description |
---|---|---|
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.
|
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
.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 Object
obj
- the object to be compared.obj
is an instance of
EllipticCurve and the field, A, and B match, false otherwise.Object.hashCode()
,
HashMap
public int hashCode()
hashCode
in class Object
(field.hashCode() << 6) + (a.hashCode() << 4) + (b.hashCode() << 2)
Object.equals(java.lang.Object)
,
System.identityHashCode(java.lang.Object)
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