--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/security/ec/ECDHKeyAgreement.java Tue Aug 11 16:52:26 2009 +0100
@@ -0,0 +1,189 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc. 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. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package sun.security.ec;
+
+import java.security.*;
+import java.security.interfaces.*;
+import java.security.spec.*;
+
+import javax.crypto.*;
+import javax.crypto.spec.*;
+
+/**
+ * KeyAgreement implementation for ECDH.
+ *
+ * @since 1.7
+ */
+public final class ECDHKeyAgreement extends KeyAgreementSpi {
+
+ // flag indicating whether the native ECC implementation is present
+ private static boolean implementationPresent = true;
+ static {
+ try {
+ AccessController.doPrivileged(new PrivilegedAction<Void>() {
+ public Void run() {
+ System.loadLibrary("sunecc");
+ return null;
+ }
+ });
+ } catch (UnsatisfiedLinkError e) {
+ implementationPresent = false;
+ }
+ }
+
+ // private key, if initialized
+ private ECPrivateKey privateKey;
+
+ // encoded public point, non-null between doPhase() & generateSecret() only
+ private byte[] publicValue;
+
+ // length of the secret to be derived
+ private int secretLen;
+
+ /**
+ * Constructs a new ECDHKeyAgreement.
+ *
+ * @exception ProviderException if the native ECC library is unavailable.
+ */
+ public ECDHKeyAgreement() {
+ if (!implementationPresent) {
+ throw new ProviderException("ECDH implementation is not available");
+ }
+ }
+
+ // see JCE spec
+ protected void engineInit(Key key, SecureRandom random)
+ throws InvalidKeyException {
+ if (!(key instanceof PrivateKey)) {
+ throw new InvalidKeyException
+ ("Key must be instance of PrivateKey");
+ }
+ privateKey = (ECPrivateKey) ECKeyFactory.toECKey(key);
+ publicValue = null;
+ }
+
+ // see JCE spec
+ protected void engineInit(Key key, AlgorithmParameterSpec params,
+ SecureRandom random) throws InvalidKeyException,
+ InvalidAlgorithmParameterException {
+ if (params != null) {
+ throw new InvalidAlgorithmParameterException
+ ("Parameters not supported");
+ }
+ engineInit(key, random);
+ }
+
+ // see JCE spec
+ protected Key engineDoPhase(Key key, boolean lastPhase)
+ throws InvalidKeyException, IllegalStateException {
+ if (privateKey == null) {
+ throw new IllegalStateException("Not initialized");
+ }
+ if (publicValue != null) {
+ throw new IllegalStateException("Phase already executed");
+ }
+ if (!lastPhase) {
+ throw new IllegalStateException
+ ("Only two party agreement supported, lastPhase must be true");
+ }
+ if (!(key instanceof ECPublicKey)) {
+ throw new InvalidKeyException
+ ("Key must be a PublicKey with algorithm EC");
+ }
+
+ ECPublicKey ecKey = (ECPublicKey)key;
+ ECParameterSpec params = ecKey.getParams();
+
+ if (ecKey instanceof ECPublicKeyImpl) {
+ publicValue = ((ECPublicKeyImpl)ecKey).getEncodedPublicValue();
+ } else { // instanceof ECPublicKey
+ publicValue =
+ ECParameters.encodePoint(ecKey.getW(), params.getCurve());
+ }
+ int keyLenBits = params.getCurve().getField().getFieldSize();
+ secretLen = (keyLenBits + 7) >> 3;
+
+ return null;
+ }
+
+ // see JCE spec
+ protected byte[] engineGenerateSecret() throws IllegalStateException {
+ if ((privateKey == null) || (publicValue == null)) {
+ throw new IllegalStateException("Not initialized correctly");
+ }
+
+ byte[] s = privateKey.getS().toByteArray();
+ byte[] encodedParams =
+ ECParameters.encodeParameters(privateKey.getParams()); // DER OID
+
+ try {
+
+ return deriveKey(s, publicValue, encodedParams);
+
+ } catch (GeneralSecurityException e) {
+ throw new ProviderException("Could not derive key", e);
+ }
+
+ }
+
+ // see JCE spec
+ protected int engineGenerateSecret(byte[] sharedSecret, int
+ offset) throws IllegalStateException, ShortBufferException {
+ if (offset + secretLen > sharedSecret.length) {
+ throw new ShortBufferException("Need " + secretLen
+ + " bytes, only " + (sharedSecret.length - offset) + " available");
+ }
+ byte[] secret = engineGenerateSecret();
+ System.arraycopy(secret, 0, sharedSecret, offset, secret.length);
+ return secret.length;
+ }
+
+ // see JCE spec
+ protected SecretKey engineGenerateSecret(String algorithm)
+ throws IllegalStateException, NoSuchAlgorithmException,
+ InvalidKeyException {
+ if (algorithm == null) {
+ throw new NoSuchAlgorithmException("Algorithm must not be null");
+ }
+ if (!(algorithm.equals("TlsPremasterSecret"))) {
+ throw new NoSuchAlgorithmException
+ ("Only supported for algorithm TlsPremasterSecret");
+ }
+ return new SecretKeySpec(engineGenerateSecret(), "TlsPremasterSecret");
+ }
+
+ /**
+ * Generates a secret key using the public and private keys.
+ *
+ * @param s the private key's S value.
+ * @param w the public key's W point (in uncompressed form).
+ * @param encodedParams the curve's DER encoded object identifier.
+ *
+ * @return byte[] the secret key.
+ */
+ private static native byte[] deriveKey(byte[] s, byte[] w,
+ byte[] encodedParams) throws GeneralSecurityException;
+}