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/*
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* Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.security.ec;
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import java.security.*;
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import java.security.interfaces.*;
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import java.security.spec.*;
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/**
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* KeyFactory for EC keys. Keys must be instances of PublicKey or PrivateKey
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* and getAlgorithm() must return "EC". For such keys, it supports conversion
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* between the following:
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*
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* For public keys:
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* . PublicKey with an X.509 encoding
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* . ECPublicKey
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* . ECPublicKeySpec
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* . X509EncodedKeySpec
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*
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* For private keys:
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* . PrivateKey with a PKCS#8 encoding
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* . ECPrivateKey
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* . ECPrivateKeySpec
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* . PKCS8EncodedKeySpec
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*
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* @since 1.6
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* @author Andreas Sterbenz
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*/
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public final class ECKeyFactory extends KeyFactorySpi {
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// Used by translateKey() and the SunPKCS11 provider
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public final static KeyFactory INSTANCE;
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// Internal provider object we can obtain the KeyFactory and
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// AlgorithmParameters from. Used by ECParameters and AlgorithmId.
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// This can go away once we have EC always available in the SUN provider.
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// Used by ECParameters and AlgorithmId.
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public final static Provider ecInternalProvider;
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static {
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final Provider p = new Provider("SunEC-Internal", 1.0d, null) {};
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AccessController.doPrivileged(new PrivilegedAction<Void>() {
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public Void run() {
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p.put("KeyFactory.EC", "sun.security.ec.ECKeyFactory");
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p.put("AlgorithmParameters.EC", "sun.security.ec.ECParameters");
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p.put("Alg.Alias.AlgorithmParameters.1.2.840.10045.2.1", "EC");
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return null;
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}
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});
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try {
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INSTANCE = KeyFactory.getInstance("EC", p);
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} catch (NoSuchAlgorithmException e) {
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throw new RuntimeException(e);
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}
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ecInternalProvider = p;
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}
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public ECKeyFactory() {
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// empty
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}
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/**
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* Static method to convert Key into a useable instance of
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* ECPublicKey or ECPrivateKey. Check the key and convert it
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* to a Sun key if necessary. If the key is not an EC key
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* or cannot be used, throw an InvalidKeyException.
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*
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* The difference between this method and engineTranslateKey() is that
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* we do not convert keys of other providers that are already an
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* instance of ECPublicKey or ECPrivateKey.
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*
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* To be used by future Java ECDSA and ECDH implementations.
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*/
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public static ECKey toECKey(Key key) throws InvalidKeyException {
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if (key instanceof ECKey) {
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ECKey ecKey = (ECKey)key;
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checkKey(ecKey);
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return ecKey;
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} else {
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return (ECKey)INSTANCE.translateKey(key);
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}
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}
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/**
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* Check that the given EC key is valid.
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*/
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private static void checkKey(ECKey key) throws InvalidKeyException {
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// check for subinterfaces, omit additional checks for our keys
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if (key instanceof ECPublicKey) {
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if (key instanceof ECPublicKeyImpl) {
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return;
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}
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} else if (key instanceof ECPrivateKey) {
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if (key instanceof ECPrivateKeyImpl) {
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return;
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}
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} else {
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throw new InvalidKeyException("Neither a public nor a private key");
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}
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// ECKey does not extend Key, so we need to do a cast
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String keyAlg = ((Key)key).getAlgorithm();
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if (keyAlg.equals("EC") == false) {
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throw new InvalidKeyException("Not an EC key: " + keyAlg);
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}
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// XXX further sanity checks about whether this key uses supported
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// fields, point formats, etc. would go here
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}
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/**
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* Translate an EC key into a Sun EC key. If conversion is
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* not possible, throw an InvalidKeyException.
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* See also JCA doc.
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*/
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protected Key engineTranslateKey(Key key) throws InvalidKeyException {
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if (key == null) {
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throw new InvalidKeyException("Key must not be null");
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}
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String keyAlg = key.getAlgorithm();
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if (keyAlg.equals("EC") == false) {
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throw new InvalidKeyException("Not an EC key: " + keyAlg);
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}
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if (key instanceof PublicKey) {
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return implTranslatePublicKey((PublicKey)key);
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} else if (key instanceof PrivateKey) {
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return implTranslatePrivateKey((PrivateKey)key);
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} else {
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throw new InvalidKeyException("Neither a public nor a private key");
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}
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}
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// see JCA doc
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protected PublicKey engineGeneratePublic(KeySpec keySpec)
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throws InvalidKeySpecException {
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try {
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return implGeneratePublic(keySpec);
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} catch (InvalidKeySpecException e) {
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throw e;
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} catch (GeneralSecurityException e) {
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throw new InvalidKeySpecException(e);
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}
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}
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// see JCA doc
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protected PrivateKey engineGeneratePrivate(KeySpec keySpec)
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throws InvalidKeySpecException {
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try {
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return implGeneratePrivate(keySpec);
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} catch (InvalidKeySpecException e) {
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throw e;
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} catch (GeneralSecurityException e) {
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throw new InvalidKeySpecException(e);
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}
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}
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// internal implementation of translateKey() for public keys. See JCA doc
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private PublicKey implTranslatePublicKey(PublicKey key)
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throws InvalidKeyException {
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if (key instanceof ECPublicKey) {
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if (key instanceof ECPublicKeyImpl) {
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return key;
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}
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ECPublicKey ecKey = (ECPublicKey)key;
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return new ECPublicKeyImpl(
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ecKey.getW(),
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ecKey.getParams()
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);
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} else if ("X.509".equals(key.getFormat())) {
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byte[] encoded = key.getEncoded();
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return new ECPublicKeyImpl(encoded);
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} else {
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throw new InvalidKeyException("Public keys must be instance "
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+ "of ECPublicKey or have X.509 encoding");
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}
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}
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// internal implementation of translateKey() for private keys. See JCA doc
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private PrivateKey implTranslatePrivateKey(PrivateKey key)
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throws InvalidKeyException {
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if (key instanceof ECPrivateKey) {
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if (key instanceof ECPrivateKeyImpl) {
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return key;
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}
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ECPrivateKey ecKey = (ECPrivateKey)key;
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return new ECPrivateKeyImpl(
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ecKey.getS(),
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ecKey.getParams()
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);
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} else if ("PKCS#8".equals(key.getFormat())) {
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return new ECPrivateKeyImpl(key.getEncoded());
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} else {
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throw new InvalidKeyException("Private keys must be instance "
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+ "of ECPrivateKey or have PKCS#8 encoding");
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}
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}
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// internal implementation of generatePublic. See JCA doc
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private PublicKey implGeneratePublic(KeySpec keySpec)
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throws GeneralSecurityException {
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if (keySpec instanceof X509EncodedKeySpec) {
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X509EncodedKeySpec x509Spec = (X509EncodedKeySpec)keySpec;
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return new ECPublicKeyImpl(x509Spec.getEncoded());
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} else if (keySpec instanceof ECPublicKeySpec) {
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ECPublicKeySpec ecSpec = (ECPublicKeySpec)keySpec;
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return new ECPublicKeyImpl(
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ecSpec.getW(),
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ecSpec.getParams()
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);
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} else {
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throw new InvalidKeySpecException("Only ECPublicKeySpec "
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+ "and X509EncodedKeySpec supported for EC public keys");
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}
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}
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// internal implementation of generatePrivate. See JCA doc
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private PrivateKey implGeneratePrivate(KeySpec keySpec)
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throws GeneralSecurityException {
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if (keySpec instanceof PKCS8EncodedKeySpec) {
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PKCS8EncodedKeySpec pkcsSpec = (PKCS8EncodedKeySpec)keySpec;
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return new ECPrivateKeyImpl(pkcsSpec.getEncoded());
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} else if (keySpec instanceof ECPrivateKeySpec) {
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ECPrivateKeySpec ecSpec = (ECPrivateKeySpec)keySpec;
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return new ECPrivateKeyImpl(ecSpec.getS(), ecSpec.getParams());
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} else {
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throw new InvalidKeySpecException("Only ECPrivateKeySpec "
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+ "and PKCS8EncodedKeySpec supported for EC private keys");
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}
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}
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protected <T extends KeySpec> T engineGetKeySpec(Key key, Class<T> keySpec)
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throws InvalidKeySpecException {
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try {
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// convert key to one of our keys
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// this also verifies that the key is a valid EC key and ensures
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// that the encoding is X.509/PKCS#8 for public/private keys
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key = engineTranslateKey(key);
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} catch (InvalidKeyException e) {
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throw new InvalidKeySpecException(e);
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}
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if (key instanceof ECPublicKey) {
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ECPublicKey ecKey = (ECPublicKey)key;
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if (ECPublicKeySpec.class.isAssignableFrom(keySpec)) {
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return (T) new ECPublicKeySpec(
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ecKey.getW(),
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ecKey.getParams()
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);
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} else if (X509EncodedKeySpec.class.isAssignableFrom(keySpec)) {
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return (T) new X509EncodedKeySpec(key.getEncoded());
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} else {
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throw new InvalidKeySpecException
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("KeySpec must be ECPublicKeySpec or "
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+ "X509EncodedKeySpec for EC public keys");
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}
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} else if (key instanceof ECPrivateKey) {
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if (PKCS8EncodedKeySpec.class.isAssignableFrom(keySpec)) {
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return (T) new PKCS8EncodedKeySpec(key.getEncoded());
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} else if (ECPrivateKeySpec.class.isAssignableFrom(keySpec)) {
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ECPrivateKey ecKey = (ECPrivateKey)key;
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return (T) new ECPrivateKeySpec(
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ecKey.getS(),
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ecKey.getParams()
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);
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} else {
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throw new InvalidKeySpecException
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("KeySpec must be ECPrivateKeySpec or "
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+ "PKCS8EncodedKeySpec for EC private keys");
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}
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} else {
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// should not occur, caught in engineTranslateKey()
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throw new InvalidKeySpecException("Neither public nor private key");
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}
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}
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}
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