8320449: ECDHKeyAgreement should validate parameters before using them

Reviewed-by: mullan

src/java.base/share/classes/sun/security/ec/ECDHKeyAgreement.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2009, 2024, 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
@@ -25,13 +25,11 @@
 
 package sun.security.ec;
 
-import sun.security.ec.point.AffinePoint;
 import sun.security.ec.point.Point;
 import sun.security.util.ArrayUtil;
 import sun.security.util.CurveDB;
 import sun.security.util.ECUtil;
 import sun.security.util.NamedCurve;
-import sun.security.util.math.ImmutableIntegerModuloP;
 import sun.security.util.math.IntegerFieldModuloP;
 import sun.security.util.math.MutableIntegerModuloP;
 import sun.security.util.math.SmallValue;
@@ -63,7 +61,7 @@ public final class ECDHKeyAgreement extends KeyAgreementSpi {
 
     // private key, if initialized
     private ECPrivateKey privateKey;
-    ECOperations privateKeyOps;
+    private ECOperations privateKeyOps;
 
     // public key, non-null between doPhase() & generateSecret() only
     private ECPublicKey publicKey;
@@ -80,20 +78,26 @@ public final class ECDHKeyAgreement extends KeyAgreementSpi {
     // Generic init
     private void init(Key key) throws
         InvalidKeyException, InvalidAlgorithmParameterException {
+        privateKey = null;
+        privateKeyOps = null;
+        publicKey = null;
+
         if (!(key instanceof PrivateKey)) {
             throw new InvalidKeyException("Key must be instance of PrivateKey");
         }
-        privateKey = (ECPrivateKey)ECKeyFactory.toECKey(key);
+
-        publicKey = null;
+        ECPrivateKey ecPrivateKey = (ECPrivateKey)ECKeyFactory.toECKey(key);
         Optional<ECOperations> opsOpt =
-            ECOperations.forParameters(privateKey.getParams());
+            ECOperations.forParameters(ecPrivateKey.getParams());
         if (opsOpt.isEmpty()) {
-            NamedCurve nc = CurveDB.lookup(privateKey.getParams());
+            NamedCurve nc = CurveDB.lookup(ecPrivateKey.getParams());
             throw new InvalidAlgorithmParameterException(
                 "Curve not supported: " + (nc != null ? nc.toString() :
                     "unknown"));
         }
-        ECUtil.checkPrivateKey(privateKey);
+        ECUtil.checkPrivateKey(ecPrivateKey);
+
+        privateKey = ecPrivateKey;
         privateKeyOps = opsOpt.get();
     }
 
@@ -139,26 +143,22 @@ public final class ECDHKeyAgreement extends KeyAgreementSpi {
                 ("Key must be a PublicKey with algorithm EC");
         }
 
+        // Validate public key
+        validate(privateKeyOps, (ECPublicKey) key);
+
         this.publicKey = (ECPublicKey) key;
 
         int keyLenBits =
             publicKey.getParams().getCurve().getField().getFieldSize();
         secretLen = (keyLenBits + 7) >> 3;
 
-        // Validate public key
-        validate(privateKeyOps, publicKey);
-
         return null;
     }
 
     // Verify that x and y are integers in the interval [0, p - 1].
     private static void validateCoordinate(BigInteger c, BigInteger mod)
         throws InvalidKeyException{
-        if (c.compareTo(BigInteger.ZERO) < 0) {
+        if (c.compareTo(BigInteger.ZERO) < 0 || c.compareTo(mod) >= 0) {
-            throw new InvalidKeyException("Invalid coordinate");
-        }
-
-        if (c.compareTo(mod) >= 0) {
             throw new InvalidKeyException("Invalid coordinate");
         }
     }

test/jdk/sun/security/ec/ECDHKeyAgreementParamValidation.java

@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2024, THL A29 Limited, a Tencent company. 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.
+ *
+ * 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.
+ */
+
+/*
+ * @test
+ * @bug 8320449
+ * @summary ECDHKeyAgreement should validate parameters before assigning them to fields.
+ * @library /test/lib
+ * @run main ECDHKeyAgreementParamValidation
+ */
+
+import javax.crypto.KeyAgreement;
+import java.math.BigInteger;
+import java.security.InvalidKeyException;
+import java.security.KeyFactory;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.interfaces.ECPrivateKey;
+import java.security.spec.ECPrivateKeySpec;
+
+import jdk.test.lib.Asserts;
+
+public class ECDHKeyAgreementParamValidation {
+
+    private static void testInitWithInvalidKey() throws Exception {
+        KeyPairGenerator kpg = KeyPairGenerator.getInstance("EC");
+        kpg.initialize(256);
+        KeyPair kp = kpg.generateKeyPair();
+        ECPrivateKey privateKey = (ECPrivateKey) kp.getPrivate();
+
+        KeyFactory keyFactory = KeyFactory.getInstance("EC");
+        ECPrivateKey invalidPrivateKey
+                = (ECPrivateKey) keyFactory.generatePrivate(
+                        new ECPrivateKeySpec(BigInteger.ZERO,
+                                privateKey.getParams()));
+
+        KeyAgreement ka = KeyAgreement.getInstance("ECDH");
+
+        // The first initiation should succeed.
+        ka.init(privateKey);
+
+        // The second initiation should fail with invalid private key,
+        // and the private key assigned by the first initiation should be cleared.
+        Asserts.assertThrows(
+                InvalidKeyException.class,
+                () -> ka.init(invalidPrivateKey));
+
+        // Cannot doPhase due to no private key.
+        Asserts.assertThrows(
+                IllegalStateException.class,
+                () -> ka.doPhase(kp.getPublic(), true));
+
+        // Cannot generate shared key due to no key
+        Asserts.assertThrows(IllegalStateException.class, ka::generateSecret);
+    }
+
+    private static void testDoPhaseWithInvalidKey() throws Exception {
+        // SECP256R1 key pair
+        KeyPairGenerator kpgP256 = KeyPairGenerator.getInstance("EC");
+        kpgP256.initialize(256);
+        KeyPair kpP256 = kpgP256.generateKeyPair();
+
+        // SECP384R1 key pair
+        KeyPairGenerator kpgP384 = KeyPairGenerator.getInstance("EC");
+        kpgP384.initialize(384);
+        KeyPair kpP384 = kpgP384.generateKeyPair();
+
+        KeyAgreement ka = KeyAgreement.getInstance("ECDH");
+        ka.init(kpP256.getPrivate());
+
+        Asserts.assertThrows(
+                InvalidKeyException.class,
+                () -> ka.doPhase(kpP384.getPublic(), true));
+
+        // Should not generate shared key with SECP256R1 private key and SECP384R1 public key
+        Asserts.assertThrows(IllegalStateException.class, ka::generateSecret);
+    }
+
+    public static void main(String[] args) {
+        boolean failed = false;
+
+        try {
+            testInitWithInvalidKey();
+        } catch (Exception e) {
+            failed = true;
+            e.printStackTrace();
+        }
+
+        try {
+            testDoPhaseWithInvalidKey();
+        } catch (Exception e) {
+            failed = true;
+            e.printStackTrace();
+        }
+
+        if (failed) {
+            throw new RuntimeException("Test failed");
+        }
+    }
+}