101 lines
2.5 KiB
C#
101 lines
2.5 KiB
C#
using System;
|
|
using System.Collections;
|
|
using System.Globalization;
|
|
|
|
using Org.BouncyCastle.Asn1;
|
|
using Org.BouncyCastle.Asn1.Sec;
|
|
using Org.BouncyCastle.Asn1.X9;
|
|
using Org.BouncyCastle.Utilities.Collections;
|
|
|
|
namespace Org.BouncyCastle.Asn1.Nist
|
|
{
|
|
/**
|
|
* Utility class for fetching curves using their NIST names as published in FIPS-PUB 186-2
|
|
*/
|
|
public sealed class NistNamedCurves
|
|
{
|
|
private NistNamedCurves()
|
|
{
|
|
}
|
|
|
|
private static readonly Hashtable objIds = new Hashtable();
|
|
private static readonly Hashtable names = new Hashtable();
|
|
|
|
private static void DefineCurve(
|
|
string name,
|
|
DerObjectIdentifier oid)
|
|
{
|
|
objIds.Add(name, oid);
|
|
names.Add(oid, name);
|
|
}
|
|
|
|
static NistNamedCurves()
|
|
{
|
|
DefineCurve("B-571", SecObjectIdentifiers.SecT571r1);
|
|
DefineCurve("B-409", SecObjectIdentifiers.SecT409r1);
|
|
DefineCurve("B-283", SecObjectIdentifiers.SecT283r1);
|
|
DefineCurve("B-233", SecObjectIdentifiers.SecT233r1);
|
|
DefineCurve("B-163", SecObjectIdentifiers.SecT163r2);
|
|
DefineCurve("P-521", SecObjectIdentifiers.SecP521r1);
|
|
DefineCurve("P-256", SecObjectIdentifiers.SecP256r1);
|
|
DefineCurve("P-224", SecObjectIdentifiers.SecP224r1);
|
|
DefineCurve("P-384", SecObjectIdentifiers.SecP384r1);
|
|
}
|
|
|
|
public static X9ECParameters GetByName(
|
|
string name)
|
|
{
|
|
DerObjectIdentifier oid = (DerObjectIdentifier) objIds[name.ToUpper(CultureInfo.InvariantCulture)];
|
|
|
|
if (oid != null)
|
|
{
|
|
return GetByOid(oid);
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* return the X9ECParameters object for the named curve represented by
|
|
* the passed in object identifier. Null if the curve isn't present.
|
|
*
|
|
* @param oid an object identifier representing a named curve, if present.
|
|
*/
|
|
public static X9ECParameters GetByOid(
|
|
DerObjectIdentifier oid)
|
|
{
|
|
return SecNamedCurves.GetByOid(oid);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
return (DerObjectIdentifier) objIds[name.ToUpper(CultureInfo.InvariantCulture)];
|
|
}
|
|
|
|
/**
|
|
* return the named curve name represented by the given object identifier.
|
|
*/
|
|
public static string GetName(
|
|
DerObjectIdentifier oid)
|
|
{
|
|
return (string) names[oid];
|
|
}
|
|
|
|
/**
|
|
* returns an enumeration containing the name strings for curves
|
|
* contained in this structure.
|
|
*/
|
|
public static IEnumerable Names
|
|
{
|
|
get { return new EnumerableProxy(objIds.Keys); }
|
|
}
|
|
}
|
|
}
|