1package org.bouncycastle.jce;
2
3import java.util.Enumeration;
4import java.util.Vector;
5
6import org.bouncycastle.asn1.ASN1ObjectIdentifier;
7import org.bouncycastle.asn1.nist.NISTNamedCurves;
8import org.bouncycastle.asn1.sec.SECNamedCurves;
9// BEGIN android-removed
10// import org.bouncycastle.asn1.teletrust.TeleTrusTNamedCurves;
11// END android-removed
12import org.bouncycastle.asn1.x9.X962NamedCurves;
13import org.bouncycastle.asn1.x9.X9ECParameters;
14import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;
15
16/**
17 * a table of locally supported named curves.
18 */
19public class ECNamedCurveTable
20{
21    /**
22     * return a parameter spec representing the passed in named
23     * curve. The routine returns null if the curve is not present.
24     *
25     * @param name the name of the curve requested
26     * @return a parameter spec for the curve, null if it is not available.
27     */
28    public static ECNamedCurveParameterSpec getParameterSpec(
29        String  name)
30    {
31        X9ECParameters  ecP = X962NamedCurves.getByName(name);
32        if (ecP == null)
33        {
34            try
35            {
36                ecP = X962NamedCurves.getByOID(new ASN1ObjectIdentifier(name));
37            }
38            catch (IllegalArgumentException e)
39            {
40                // ignore - not an oid
41            }
42        }
43
44        if (ecP == null)
45        {
46            ecP = SECNamedCurves.getByName(name);
47            if (ecP == null)
48            {
49                try
50                {
51                    ecP = SECNamedCurves.getByOID(new ASN1ObjectIdentifier(name));
52                }
53                catch (IllegalArgumentException e)
54                {
55                    // ignore - not an oid
56                }
57            }
58        }
59
60        // BEGIN android-removed
61        // if (ecP == null)
62        // {
63        //     ecP = TeleTrusTNamedCurves.getByName(name);
64        //     if (ecP == null)
65        //     {
66        //         try
67        //         {
68        //             ecP = TeleTrusTNamedCurves.getByOID(new ASN1ObjectIdentifier(name));
69        //         }
70        //         catch (IllegalArgumentException e)
71        //         {
72        //             // ignore - not an oid
73        //         }
74        //     }
75        // }
76        // END android-removed
77
78        if (ecP == null)
79        {
80            ecP = NISTNamedCurves.getByName(name);
81        }
82
83        if (ecP == null)
84        {
85            return null;
86        }
87
88        return new ECNamedCurveParameterSpec(
89                                        name,
90                                        ecP.getCurve(),
91                                        ecP.getG(),
92                                        ecP.getN(),
93                                        ecP.getH(),
94                                        ecP.getSeed());
95    }
96
97    /**
98     * return an enumeration of the names of the available curves.
99     *
100     * @return an enumeration of the names of the available curves.
101     */
102    public static Enumeration getNames()
103    {
104        Vector v = new Vector();
105
106        addEnumeration(v, X962NamedCurves.getNames());
107        addEnumeration(v, SECNamedCurves.getNames());
108        addEnumeration(v, NISTNamedCurves.getNames());
109        // BEGIN android-removed
110        // addEnumeration(v, TeleTrusTNamedCurves.getNames());
111        // END android-removed
112
113        return v.elements();
114    }
115
116    private static void addEnumeration(
117        Vector v,
118        Enumeration e)
119    {
120        while (e.hasMoreElements())
121        {
122            v.addElement(e.nextElement());
123        }
124    }
125}
126