org.bouncycastle.asn1.x9.X962Parameters.java Source code

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Here is the source code for org.bouncycastle.asn1.x9.X962Parameters.java

Source

package org.bouncycastle.asn1.x9;

import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1Null;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1TaggedObject;

/**
 * The Parameters ASN.1 CHOICE from X9.62.
 */
public class X962Parameters extends ASN1Object implements ASN1Choice {
    private ASN1Primitive params = null;

    public static X962Parameters getInstance(Object obj) {
        if (obj == null || obj instanceof X962Parameters) {
            return (X962Parameters) obj;
        }

        if (obj instanceof ASN1Primitive) {
            return new X962Parameters((ASN1Primitive) obj);
        }

        if (obj instanceof byte[]) {
            try {
                return new X962Parameters(ASN1Primitive.fromByteArray((byte[]) obj));
            } catch (Exception e) {
                throw new IllegalArgumentException("unable to parse encoded data: " + e.getMessage());
            }
        }

        throw new IllegalArgumentException("unknown object in getInstance()");
    }

    public static X962Parameters getInstance(ASN1TaggedObject obj, boolean explicit) {
        return getInstance(obj.getObject()); // must be explicitly tagged
    }

    public X962Parameters(X9ECParameters ecParameters) {
        this.params = ecParameters.toASN1Primitive();
    }

    public X962Parameters(ASN1ObjectIdentifier namedCurve) {
        this.params = namedCurve;
    }

    public X962Parameters(ASN1Null obj) {
        this.params = obj;
    }

    private X962Parameters(ASN1Primitive obj) {
        this.params = obj;
    }

    public boolean isNamedCurve() {
        return (params instanceof ASN1ObjectIdentifier);
    }

    public boolean isImplicitlyCA() {
        return (params instanceof ASN1Null);
    }

    public ASN1Primitive getParameters() {
        return params;
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     * <pre>
     * Parameters ::= CHOICE {
     *    ecParameters ECParameters,
     *    namedCurve   CURVES.&amp;id({CurveNames}),
     *    implicitlyCA NULL
     * }
     * </pre>
     */
    public ASN1Primitive toASN1Primitive() {
        return params;
    }
}