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Java™ Platform Standard Ed. 6 |
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java.lang.Object java.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 . |
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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 |
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clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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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 Object
obj
- the object to be compared.
obj
is an instance of
EllipticCurve and the field, A, B, and seeding bytes
match, false otherwise.Object.hashCode()
,
Hashtable
public int hashCode()
hashCode
in class Object
Object.equals(java.lang.Object)
,
Hashtable
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Java™ Platform Standard Ed. 6 |
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