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Java Standard Edition (SE)

EllipticCurve


compact1, compact2, compact3
java.security.spec

Class EllipticCurve



  • public class EllipticCurve
    extends Object
    This immutable class holds the necessary values needed to represent an elliptic curve.
    Since:
    1.5
    See Also:
    ECField, ECFieldFp, ECFieldF2m
    • Constructor Detail

      • EllipticCurve

        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 - 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.
      • EllipticCurve

        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 - 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.
    • Method Detail

      • getField

        public ECField getField()
        Returns the finite field field that this elliptic curve is over.
        Returns:
        the field field that this curve is over.
      • getA

        public BigInteger getA()
        Returns the first coefficient a of the elliptic curve.
        Returns:
        the first coefficient a.
      • getB

        public BigInteger getB()
        Returns the second coefficient b of the elliptic curve.
        Returns:
        the second coefficient b.
      • getSeed

        public byte[] getSeed()
        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.
      • equals

        public boolean equals(Object obj)
        Compares this elliptic curve for equality with the specified object.
        Overrides:
        equals in class Object
        Parameters:
        obj - the object to be compared.
        Returns:
        true if obj is an instance of EllipticCurve and the field, A, and B match, false otherwise.
        See Also:
        Object.hashCode(), HashMap


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