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using System;
using System.Collections;
using Org.BouncyCastle.Asn1.Anssi;
using Org.BouncyCastle.Asn1.Nist;
using Org.BouncyCastle.Asn1.Sec;
using Org.BouncyCastle.Asn1.TeleTrust;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Collections;
namespace Org.BouncyCastle.Asn1.X9
{
/**
* 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 = NistNamedCurves.GetByName(name);
}
if (ecP == null)
{
ecP = TeleTrusTNamedCurves.GetByName(name);
}
if (ecP == null)
{
ecP = AnssiNamedCurves.GetByName(name);
}
return ecP;
}
/**
* return the object identifier signified by the passed in name. Null
* if there is no object identifier associated with name.
*
* @return the object identifier associated with name, if present.
*/
public static DerObjectIdentifier GetOid(string name)
{
DerObjectIdentifier oid = X962NamedCurves.GetOid(name);
if (oid == null)
{
oid = SecNamedCurves.GetOid(name);
}
if (oid == null)
{
oid = NistNamedCurves.GetOid(name);
}
if (oid == null)
{
oid = TeleTrusTNamedCurves.GetOid(name);
}
if (oid == null)
{
oid = AnssiNamedCurves.GetOid(name);
}
return oid;
}
/**
* 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(DerObjectIdentifier 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 IEnumerable Names
{
get
{
IList v = Platform.CreateArrayList();
CollectionUtilities.AddRange(v, X962NamedCurves.Names);
CollectionUtilities.AddRange(v, SecNamedCurves.Names);
CollectionUtilities.AddRange(v, NistNamedCurves.Names);
CollectionUtilities.AddRange(v, TeleTrusTNamedCurves.Names);
CollectionUtilities.AddRange(v, AnssiNamedCurves.Names);
return v;
}
}
}
}
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