001package org.apache.commons.ssl.org.bouncycastle.asn1.x9;
002
003import java.util.Enumeration;
004import java.util.Vector;
005
006import org.apache.commons.ssl.org.bouncycastle.asn1.ASN1ObjectIdentifier;
007import org.apache.commons.ssl.org.bouncycastle.asn1.nist.NISTNamedCurves;
008import org.apache.commons.ssl.org.bouncycastle.asn1.sec.SECNamedCurves;
009import org.apache.commons.ssl.org.bouncycastle.asn1.teletrust.TeleTrusTNamedCurves;
010
011/**
012 * A general class that reads all X9.62 style EC curve tables.
013 */
014public class ECNamedCurveTable
015{
016    /**
017     * return a X9ECParameters object representing the passed in named
018     * curve. The routine returns null if the curve is not present.
019     *
020     * @param name the name of the curve requested
021     * @return an X9ECParameters object or null if the curve is not available.
022     */
023    public static X9ECParameters getByName(
024        String name)
025    {
026        X9ECParameters ecP = X962NamedCurves.getByName(name);
027
028        if (ecP == null)
029        {
030            ecP = SECNamedCurves.getByName(name);
031        }
032
033        if (ecP == null)
034        {
035            ecP = TeleTrusTNamedCurves.getByName(name);
036        }
037
038        if (ecP == null)
039        {
040            ecP = NISTNamedCurves.getByName(name);
041        }
042
043        return ecP;
044    }
045
046    /**
047     * return the object identifier signified by the passed in name. Null
048     * if there is no object identifier associated with name.
049     *
050     * @return the object identifier associated with name, if present.
051     */
052    public static ASN1ObjectIdentifier getOID(
053        String name)
054    {
055        ASN1ObjectIdentifier oid = X962NamedCurves.getOID(name);
056
057        if (oid == null)
058        {
059            oid = SECNamedCurves.getOID(name);
060        }
061
062        if (oid == null)
063        {
064            oid = TeleTrusTNamedCurves.getOID(name);
065        }
066
067        if (oid == null)
068        {
069            oid = NISTNamedCurves.getOID(name);
070        }
071
072        return oid;
073    }
074
075    /**
076     * return a X9ECParameters object representing the passed in named
077     * curve.
078     *
079     * @param oid the object id of the curve requested
080     * @return an X9ECParameters object or null if the curve is not available.
081     */
082    public static X9ECParameters getByOID(
083        ASN1ObjectIdentifier oid)
084    {
085        X9ECParameters ecP = X962NamedCurves.getByOID(oid);
086
087        if (ecP == null)
088        {
089            ecP = SECNamedCurves.getByOID(oid);
090        }
091
092        if (ecP == null)
093        {
094            ecP = TeleTrusTNamedCurves.getByOID(oid);
095        }
096
097        // NOTE: All the NIST curves are currently from SEC, so no point in redundant OID lookup
098
099        return ecP;
100    }
101
102    /**
103     * return an enumeration of the names of the available curves.
104     *
105     * @return an enumeration of the names of the available curves.
106     */
107    public static Enumeration getNames()
108    {
109        Vector v = new Vector();
110
111        addEnumeration(v, X962NamedCurves.getNames());
112        addEnumeration(v, SECNamedCurves.getNames());
113        addEnumeration(v, NISTNamedCurves.getNames());
114        addEnumeration(v, TeleTrusTNamedCurves.getNames());
115
116        return v.elements();
117    }
118
119    private static void addEnumeration(
120        Vector v,
121        Enumeration e)
122    {
123        while (e.hasMoreElements())
124        {
125            v.addElement(e.nextElement());
126        }
127    }
128}