Package org.bouncycastle.math.ec

Class ECPoint

    • Method Detail

      • satisfiesCofactor

        protected boolean satisfiesCofactor()

      • satisfiesCurveEquation

        protected abstract boolean satisfiesCurveEquation()

      • getDetachedPoint

        public final ECPoint getDetachedPoint()

      • getCurve

        public ECCurve getCurve()

      • detach

        protected abstract ECPoint detach()

      • getCurveCoordinateSystem

        protected int getCurveCoordinateSystem()

      • getX

        public ECFieldElement getX()
        Deprecated.
        Use getAffineXCoord(), or normalize() and getXCoord(), instead
        Normalizes this point, and then returns the affine x-coordinate. Note: normalization can be expensive, this method is deprecated in favour of caller-controlled normalization.

      • getY

        public ECFieldElement getY()
        Deprecated.
        Use getAffineYCoord(), or normalize() and getYCoord(), instead
        Normalizes this point, and then returns the affine y-coordinate. Note: normalization can be expensive, this method is deprecated in favour of caller-controlled normalization.

      • getAffineXCoord

        public ECFieldElement getAffineXCoord()
        Returns the affine x-coordinate after checking that this point is normalized.
        Returns:
        The affine x-coordinate of this point
        Throws:
        IllegalStateException - if the point is not normalized

      • getAffineYCoord

        public ECFieldElement getAffineYCoord()
        Returns the affine y-coordinate after checking that this point is normalized
        Returns:
        The affine y-coordinate of this point
        Throws:
        IllegalStateException - if the point is not normalized

      • getXCoord

        public ECFieldElement getXCoord()
        Returns the x-coordinate. Caution: depending on the curve's coordinate system, this may not be the same value as in an affine coordinate system; use normalize() to get a point where the coordinates have their affine values, or use getAffineXCoord() if you expect the point to already have been normalized.
        Returns:
        the x-coordinate of this point

      • getYCoord

        public ECFieldElement getYCoord()
        Returns the y-coordinate. Caution: depending on the curve's coordinate system, this may not be the same value as in an affine coordinate system; use normalize() to get a point where the coordinates have their affine values, or use getAffineYCoord() if you expect the point to already have been normalized.
        Returns:
        the y-coordinate of this point

      • checkNormalized

        protected void checkNormalized()

      • isNormalized

        public boolean isNormalized()

      • normalize

        public ECPoint normalize()
        Normalization ensures that any projective coordinate is 1, and therefore that the x, y coordinates reflect those of the equivalent point in an affine coordinate system.
        Returns:
        a new ECPoint instance representing the same point, but with normalized coordinates

      • isInfinity

        public boolean isInfinity()

      • isCompressed

        public boolean isCompressed()
        Deprecated.
        per-point compression property will be removed, refer getEncoded(boolean)

      • isValid

        public boolean isValid()

      • equals

        public boolean equals​(ECPoint other)

      • equals

        public boolean equals​(Object other)
        Description copied from class: Object
        Compares this instance with the specified object and indicates if they are equal. In order to be equal, o must represent the same object as this instance using a class-specific comparison. The general contract is that this comparison should be reflexive, symmetric, and transitive. Also, no object reference other than null is equal to null.

        The default implementation returns true only if this == o. See Writing a correct equals method if you intend implementing your own equals method.

        The general contract for the equals and Object.hashCode() methods is that if equals returns true for any two objects, then hashCode() must return the same value for these objects. This means that subclasses of Object usually override either both methods or neither of them.

        Overrides:
        equals in class Object
        Parameters:
        other - the object to compare this instance with.
        Returns:
        true if the specified object is equal to this Object; false otherwise.
        See Also:
        Object.hashCode()

      • hashCode

        public int hashCode()
        Description copied from class: Object
        Returns an integer hash code for this object. By contract, any two objects for which Object.equals(java.lang.Object) returns true must return the same hash code value. This means that subclasses of Object usually override both methods or neither method.

        Note that hash values must not change over time unless information used in equals comparisons also changes.

        See Writing a correct hashCode method if you intend implementing your own hashCode method.

        Overrides:
        hashCode in class Object
        Returns:
        this object's hash code.
        See Also:
        Object.equals(java.lang.Object)

      • toString

        public String toString()
        Description copied from class: Object
        Returns a string containing a concise, human-readable description of this object. Subclasses are encouraged to override this method and provide an implementation that takes into account the object's type and data. The default implementation is equivalent to the following expression: 
           getClass().getName() + '@' + Integer.toHexString(hashCode())

        See Writing a useful toString method if you intend implementing your own toString method.

        Overrides:
        toString in class Object
        Returns:
        a printable representation of this object.

      • getEncoded

        public byte[] getEncoded()
        Deprecated.
        per-point compression property will be removed, refer getEncoded(boolean)

      • getEncoded

        public byte[] getEncoded​(boolean compressed)
        Get an encoding of the point value, optionally in compressed format.
        Parameters:
        compressed - whether to generate a compressed point encoding.
        Returns:
        the point encoding

      • getCompressionYTilde

        protected abstract boolean getCompressionYTilde()

      • negate

        public abstract ECPoint negate()

      • timesPow2

        public ECPoint timesPow2​(int e)

      • twice

        public abstract ECPoint twice()

      • threeTimes

        public ECPoint threeTimes()

      • multiply

        public ECPoint multiply​(BigInteger k)
        Multiplies this ECPoint by the given number.
        Parameters:
        k - The multiplicator.
        Returns:
        k * this.