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package org.spongycastle.asn1.x9;
import java.util.Enumeration;
import java.util.Vector;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.nist.NISTNamedCurves;
import org.spongycastle.asn1.sec.SECNamedCurves;
import org.spongycastle.asn1.teletrust.TeleTrusTNamedCurves;
/**
* A general class that reads all X9.62 style EC curve tables.
*/
public class ECNamedCurveTable
{
/**
* return a X9ECParameters object 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 an X9ECParameters object or null if the curve is not available.
*/
public static X9ECParameters getByName(
String name)
{
X9ECParameters ecP = X962NamedCurves.getByName(name);
if (ecP == null)
{
ecP = SECNamedCurves.getByName(name);
}
if (ecP == null)
{
ecP = TeleTrusTNamedCurves.getByName(name);
}
if (ecP == null)
{
ecP = NISTNamedCurves.getByName(name);
}
return ecP;
}
/**
* return a X9ECParameters object representing the passed in named
* curve.
*
* @param oid the object id of the curve requested
* @return an X9ECParameters object or null if the curve is not available.
*/
public static X9ECParameters getByOID(
ASN1ObjectIdentifier oid)
{
X9ECParameters ecP = X962NamedCurves.getByOID(oid);
if (ecP == null)
{
ecP = SECNamedCurves.getByOID(oid);
}
if (ecP == null)
{
ecP = TeleTrusTNamedCurves.getByOID(oid);
}
// NOTE: All the NIST curves are currently from SEC, so no point in redundant OID lookup
return ecP;
}
/**
* return an enumeration of the names of the available curves.
*
* @return an enumeration of the names of the available curves.
*/
public static Enumeration getNames()
{
Vector v = new Vector();
addEnumeration(v, X962NamedCurves.getNames());
addEnumeration(v, SECNamedCurves.getNames());
addEnumeration(v, NISTNamedCurves.getNames());
addEnumeration(v, TeleTrusTNamedCurves.getNames());
return v.elements();
}
private static void addEnumeration(
Vector v,
Enumeration e)
{
while (e.hasMoreElements())
{
v.addElement(e.nextElement());
}
}
}
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