org.bouncycastle.jce.ECNamedCurveTable.java Source code

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Here is the source code for org.bouncycastle.jce.ECNamedCurveTable.java

Source

package org.bouncycastle.jce;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;

/**
 * a table of locally supported named curves.
 */
public class ECNamedCurveTable {
    /**
     * return a parameter spec representing the passed in named
     * curve. The routine returns null if the curve is not present.
     * 
     * @param name the name of the curve requested
     * @return a parameter spec for the curve, null if it is not available.
     */
    public static ECNamedCurveParameterSpec getParameterSpec(String name) {
        X9ECParameters ecP = org.bouncycastle.crypto.ec.CustomNamedCurves.getByName(name);
        if (ecP == null) {
            try {
                ecP = org.bouncycastle.crypto.ec.CustomNamedCurves.getByOID(new ASN1ObjectIdentifier(name));
            } catch (IllegalArgumentException e) {
                // ignore - not an oid
            }

            if (ecP == null) {
                ecP = org.bouncycastle.asn1.x9.ECNamedCurveTable.getByName(name);
                if (ecP == null) {
                    try {
                        ecP = org.bouncycastle.asn1.x9.ECNamedCurveTable.getByOID(new ASN1ObjectIdentifier(name));
                    } catch (IllegalArgumentException e) {
                        // ignore - not an oid
                    }
                }
            }
        }

        if (ecP == null) {
            return null;
        }

        return new ECNamedCurveParameterSpec(name, ecP.getCurve(), ecP.getG(), ecP.getN(), ecP.getH(),
                ecP.getSeed());
    }

    /**
     * return an enumeration of the names of the available curves.
     *
     * @return an enumeration of the names of the available curves.
     */
    public static Enumeration getNames() {
        return org.bouncycastle.asn1.x9.ECNamedCurveTable.getNames();
    }
}