EllipticCurve JDK 1.6)

Constructors

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

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

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

Creates an elliptic curve with the specified elliptic field
field, the coefficients a and
b, and the seed used for curve generation.
Parameters:
- 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.
Throws:
- NullPointerException - if field, a, or b is null.
- IllegalArgumentException - if a or b is not null and not in field.

Methods

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public boolean equals (Object obj)

Compares this elliptic curve for equality with the specified object.

Compares this elliptic curve for equality with the
specified object.
Returns: true if obj is an instance of EllipticCurve and the field, A, B, and seeding bytes match, false otherwise.
Parameters:
- obj - the object to be compared.

public BigInteger getA ()

Returns the first coefficient a of the elliptic curve.

Returns the first coefficient a of the
elliptic curve.
Returns: the first coefficient a.

public BigInteger getB ()

Returns the second coefficient b of the elliptic curve.

Returns the second coefficient b of the
elliptic curve.
Returns: the second coefficient b.

public ECField getField ()

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

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

public byte getSeed ()

Returns the seeding bytes seed used during curve generation.

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