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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)
{
this(p, false);
}
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;
}
}
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