org.bouncycastle.asn1.x9.X9ECPoint.java Source code

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Here is the source code for org.bouncycastle.asn1.x9.X9ECPoint.java

Source

package org.bouncycastle.asn1.x9;

import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.Arrays;

/**
 * Class for describing an ECPoint as a DER object.
 */
public class X9ECPoint extends ASN1Object {
    private final ASN1OctetString encoding;

    private ECCurve c;
    private ECPoint p;

    public X9ECPoint(ECPoint p, boolean compressed) {
        this.p = p.normalize();
        this.encoding = new DEROctetString(p.getEncoded(compressed));
    }

    public X9ECPoint(ECCurve c, byte[] encoding) {
        this.c = c;
        this.encoding = new DEROctetString(Arrays.clone(encoding));
    }

    public X9ECPoint(ECCurve c, ASN1OctetString s) {
        this(c, s.getOctets());
    }

    public byte[] getPointEncoding() {
        return Arrays.clone(encoding.getOctets());
    }

    public synchronized ECPoint getPoint() {
        if (p == null) {
            p = c.decodePoint(encoding.getOctets()).normalize();
        }

        return p;
    }

    public boolean isPointCompressed() {
        byte[] octets = encoding.getOctets();
        return octets != null && octets.length > 0 && (octets[0] == 2 || octets[0] == 3);
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     * <pre>
     *  ECPoint ::= OCTET STRING
     * </pre>
     * <p>
     * Octet string produced using ECPoint.getEncoded().
     */
    public ASN1Primitive toASN1Primitive() {
        return encoding;
    }
}