| /* |
| * Copyright (c) 2006, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.util; |
| |
| import java.io.IOException; |
| |
| import java.security.*; |
| import java.security.spec.*; |
| |
| /** |
| * This class implements encoding and decoding of Elliptic Curve parameters |
| * as specified in RFC 3279. |
| * |
| * However, only named curves are currently supported. |
| * |
| * ASN.1 from RFC 3279 follows. Note that X9.62 (2005) has added some additional |
| * options. |
| * |
| * <pre> |
| * EcpkParameters ::= CHOICE { |
| * ecParameters ECParameters, |
| * namedCurve OBJECT IDENTIFIER, |
| * implicitlyCA NULL } |
| * |
| * ECParameters ::= SEQUENCE { |
| * version ECPVer, -- version is always 1 |
| * fieldID FieldID, -- identifies the finite field over |
| * -- which the curve is defined |
| * curve Curve, -- coefficients a and b of the |
| * -- elliptic curve |
| * base ECPoint, -- specifies the base point P |
| * -- on the elliptic curve |
| * order INTEGER, -- the order n of the base point |
| * cofactor INTEGER OPTIONAL -- The integer h = #E(Fq)/n |
| * } |
| * |
| * ECPVer ::= INTEGER {ecpVer1(1)} |
| * |
| * Curve ::= SEQUENCE { |
| * a FieldElement, |
| * b FieldElement, |
| * seed BIT STRING OPTIONAL } |
| * |
| * FieldElement ::= OCTET STRING |
| * |
| * ECPoint ::= OCTET STRING |
| * </pre> |
| * |
| * @since 1.6 |
| * @author Andreas Sterbenz |
| */ |
| public final class ECParameters extends AlgorithmParametersSpi { |
| |
| // used by ECPublicKeyImpl and ECPrivateKeyImpl |
| public static AlgorithmParameters getAlgorithmParameters(ECParameterSpec spec) |
| throws InvalidKeyException { |
| try { |
| AlgorithmParameters params = |
| AlgorithmParameters.getInstance("EC", "SunEC"); |
| params.init(spec); |
| return params; |
| } catch (GeneralSecurityException e) { |
| throw new InvalidKeyException("EC parameters error", e); |
| } |
| } |
| |
| /* |
| * The parameters these AlgorithmParameters object represents. |
| * Currently, it is always an instance of NamedCurve. |
| */ |
| private NamedCurve namedCurve; |
| |
| // A public constructor is required by AlgorithmParameters class. |
| public ECParameters() { |
| // empty |
| } |
| |
| // AlgorithmParameterSpi methods |
| |
| protected void engineInit(AlgorithmParameterSpec paramSpec) |
| throws InvalidParameterSpecException { |
| |
| if (paramSpec == null) { |
| throw new InvalidParameterSpecException |
| ("paramSpec must not be null"); |
| } |
| |
| if (paramSpec instanceof NamedCurve) { |
| namedCurve = (NamedCurve)paramSpec; |
| return; |
| } |
| |
| if (paramSpec instanceof ECParameterSpec) { |
| namedCurve = CurveDB.lookup((ECParameterSpec)paramSpec); |
| } else if (paramSpec instanceof ECGenParameterSpec) { |
| String name = ((ECGenParameterSpec)paramSpec).getName(); |
| namedCurve = CurveDB.lookup(name); |
| } else if (paramSpec instanceof ECKeySizeParameterSpec) { |
| int keySize = ((ECKeySizeParameterSpec)paramSpec).getKeySize(); |
| namedCurve = CurveDB.lookup(keySize); |
| } else { |
| throw new InvalidParameterSpecException |
| ("Only ECParameterSpec and ECGenParameterSpec supported"); |
| } |
| |
| if (namedCurve == null) { |
| throw new InvalidParameterSpecException( |
| "Not a supported curve: " + paramSpec); |
| } |
| } |
| |
| protected void engineInit(byte[] params) throws IOException { |
| DerValue encodedParams = new DerValue(params); |
| if (encodedParams.tag == DerValue.tag_ObjectId) { |
| ObjectIdentifier oid = encodedParams.getOID(); |
| NamedCurve spec = CurveDB.lookup(oid.toString()); |
| if (spec == null) { |
| throw new IOException("Unknown named curve: " + oid); |
| } |
| |
| namedCurve = spec; |
| return; |
| } |
| |
| throw new IOException("Only named ECParameters supported"); |
| |
| // The code below is incomplete. |
| // It is left as a starting point for a complete parsing implementation. |
| |
| /* |
| if (encodedParams.tag != DerValue.tag_Sequence) { |
| throw new IOException("Unsupported EC parameters, tag: " + |
| encodedParams.tag); |
| } |
| |
| encodedParams.data.reset(); |
| |
| DerInputStream in = encodedParams.data; |
| |
| int version = in.getInteger(); |
| if (version != 1) { |
| throw new IOException("Unsupported EC parameters version: " + |
| version); |
| } |
| ECField field = parseField(in); |
| EllipticCurve curve = parseCurve(in, field); |
| ECPoint point = parsePoint(in, curve); |
| |
| BigInteger order = in.getBigInteger(); |
| int cofactor = 0; |
| |
| if (in.available() != 0) { |
| cofactor = in.getInteger(); |
| } |
| |
| // XXX HashAlgorithm optional |
| |
| if (encodedParams.data.available() != 0) { |
| throw new IOException("encoded params have " + |
| encodedParams.data.available() + |
| " extra bytes"); |
| } |
| |
| return new ECParameterSpec(curve, point, order, cofactor); |
| */ |
| } |
| |
| protected void engineInit(byte[] params, String decodingMethod) |
| throws IOException { |
| engineInit(params); |
| } |
| |
| protected <T extends AlgorithmParameterSpec> T |
| engineGetParameterSpec(Class<T> spec) |
| throws InvalidParameterSpecException { |
| |
| if (spec.isAssignableFrom(ECParameterSpec.class)) { |
| return spec.cast(namedCurve); |
| } |
| |
| if (spec.isAssignableFrom(ECGenParameterSpec.class)) { |
| // Ensure the name is the Object ID |
| String name = namedCurve.getObjectId(); |
| return spec.cast(new ECGenParameterSpec(name)); |
| } |
| |
| if (spec.isAssignableFrom(ECKeySizeParameterSpec.class)) { |
| int keySize = namedCurve.getCurve().getField().getFieldSize(); |
| return spec.cast(new ECKeySizeParameterSpec(keySize)); |
| } |
| |
| throw new InvalidParameterSpecException( |
| "Only ECParameterSpec and ECGenParameterSpec supported"); |
| } |
| |
| protected byte[] engineGetEncoded() throws IOException { |
| return namedCurve.getEncoded(); |
| } |
| |
| protected byte[] engineGetEncoded(String encodingMethod) |
| throws IOException { |
| return engineGetEncoded(); |
| } |
| |
| protected String engineToString() { |
| if (namedCurve == null) { |
| return "Not initialized"; |
| } |
| |
| return namedCurve.toString(); |
| } |
| } |
| |