8268621: SunJCE provider may throw unexpected NPE for un-initialized …

…AES KW/KWP Ciphers

Reviewed-by: xuelei

src/java.base/share/classes/com/sun/crypto/provider/AESKeyWrap.java

@@ -41,7 +41,7 @@
 class AESKeyWrap extends FeedbackCipher {
 
     // default integrity check value (icv) if iv is not supplied
-    private static final byte[] ICV1 = { // SEMI_BLKSIZE long
+    static final byte[] ICV1 = { // SEMI_BLKSIZE long
         (byte) 0xA6, (byte) 0xA6, (byte) 0xA6, (byte) 0xA6,
         (byte) 0xA6, (byte) 0xA6, (byte) 0xA6, (byte) 0xA6
     };

src/java.base/share/classes/com/sun/crypto/provider/AESKeyWrapPadded.java

@@ -42,7 +42,7 @@
 class AESKeyWrapPadded extends FeedbackCipher {
 
     // default integrity check value (icv) if iv is not supplied
-    private static final byte[] ICV2 = { // SEMI_BLKSIZE/2 long
+    static final byte[] ICV2 = { // SEMI_BLKSIZE/2 long
         (byte) 0xA6, (byte) 0x59, (byte) 0x59, (byte) 0xA6,
     };
 

src/java.base/share/classes/com/sun/crypto/provider/KeyWrapCipher.java

@@ -161,6 +161,7 @@ private void store(byte[] in, int inOfs, int inLen) {
     }
 
     // internal cipher object which does the real work.
+    // AESKeyWrap for KW, AESKeyWrapPadded for KWP
     private final FeedbackCipher cipher;
 
     // internal padding object; null if NoPadding
@@ -279,13 +280,15 @@ protected int engineGetOutputSize(int inLen) {
     }
 
     /**
-     * Returns the initialization vector (IV).
+     * Returns the initialization vector (IV) in a new buffer.
      *
-     * @return the user-specified iv or null if default iv is used.
+     * @return the user-specified iv, or null if the underlying algorithm does
+     * not use an IV, or if the IV has not yet been set.
      */
     @Override
     protected byte[] engineGetIV() {
-        return cipher.getIV().clone();
+        byte[] iv = cipher.getIV();
+        return (iv == null? null : iv.clone());
     }
 
     // actual impl for various engineInit(...) methods
@@ -623,13 +626,18 @@ private int helperDecrypt(byte[] inBuf, int inLen)
     /**
      * Returns the parameters used with this cipher.
      *
-     * @return AlgorithmParameters object containing IV.
+     * @return AlgorithmParameters object containing IV, or null if this cipher
+     * does not use any parameters.
      */
     @Override
     protected AlgorithmParameters engineGetParameters() {
         AlgorithmParameters params = null;
 
         byte[] iv = cipher.getIV();
+        if (iv == null) {
+            iv = (cipher instanceof AESKeyWrap?
+                    AESKeyWrap.ICV1 : AESKeyWrapPadded.ICV2);
+        }
         try {
             params = AlgorithmParameters.getInstance("AES");
             params.init(new IvParameterSpec(iv));

test/jdk/com/sun/crypto/provider/Cipher/KeyWrap/TestGeneral.java

@@ -23,21 +23,23 @@
 
 /*
  * @test
- * @bug 8248268
+ * @bug 8248268 8268621
  * @summary Verify general properties of the AES/KW/NoPadding,
  *     AES/KW/PKCS5Padding, and AES/KWP/NoPadding.
  * @run main TestGeneral
  */
 import java.util.Arrays;
-import java.util.Random;
 import java.security.Key;
 import java.security.InvalidAlgorithmParameterException;
 import javax.crypto.*;
 import javax.crypto.spec.*;
 
 public class TestGeneral {
 
-    private static final SecretKey KEY = new SecretKeySpec(new byte[16], "AES");;
+    private static final byte[] DATA_128 =
+            Arrays.copyOf("1234567890123456789012345678901234".getBytes(), 128);
+    private static final SecretKey KEY =
+            new SecretKeySpec(DATA_128, 0, 16, "AES");
     private static final int KW_IV_LEN = 8;
     private static final int KWP_IV_LEN = 4;
     private static final int MAX_KW_PKCS5PAD_LEN = 16; // 1-16
@@ -133,32 +135,51 @@ public static void testWrap(Cipher c, byte[] in, int inLen, int ivLen,
     }
 
     public static void testIv(Cipher c) throws Exception {
+        // get a fresh Cipher instance so we can test iv with pre-init state
+        Cipher c2 = Cipher.getInstance(c.getAlgorithm(), c.getProvider());
+        if (c2.getIV() != null) {
+            throw new RuntimeException("Expects null iv");
+        }
+        if (c2.getParameters() == null) {
+            throw new RuntimeException("Expects non-null default parameters");
+        }
+
+        c2.init(Cipher.ENCRYPT_MODE, KEY);
+        byte[] defIv2 = c2.getIV();
         c.init(Cipher.ENCRYPT_MODE, KEY);
         byte[] defIv = c.getIV();
-        // try init w/ an iv w/ different length
+        if (!Arrays.equals(defIv, defIv2)) {
+            throw new RuntimeException("Failed default iv check");
+        }
+        // try init w/ an iv w/ invalid length
         try {
             c.init(Cipher.ENCRYPT_MODE, KEY, new IvParameterSpec(defIv, 0,
                 defIv.length/2));
+            throw new RuntimeException("Invalid iv accepted");
         } catch (InvalidAlgorithmParameterException iape) {
             System.out.println("Invalid IV rejected as expected");
         }
         Arrays.fill(defIv, (byte) 0xFF);
         c.init(Cipher.ENCRYPT_MODE, KEY, new IvParameterSpec(defIv));
         byte[] newIv = c.getIV();
         if (!Arrays.equals(newIv, defIv)) {
-            throw new RuntimeException("Failed iv check");
+            throw new RuntimeException("Failed set iv check");
+        }
+        byte[] newIv2 = c.getIV();
+        if (newIv == newIv2) {
+            throw new RuntimeException("Failed getIV copy check");
         }
     }
 
     public static void main(String[] argv) throws Exception {
-        // test all possible pad lengths, i.e. 1 - 16
-        byte[] data = new byte[128];
-        new Random().nextBytes(data);
+        byte[] data = DATA_128;
 
         String ALGO = "AES/KW/PKCS5Padding";
         System.out.println("Testing " + ALGO);
         Cipher c = Cipher.getInstance(ALGO, "SunJCE");
-        for (int i = 0; i < MAX_KW_PKCS5PAD_LEN; i++) {
+
+        // test all possible pad lengths, i.e. 1 - 16
+        for (int i = 1; i <= MAX_KW_PKCS5PAD_LEN; i++) {
             testEnc(c, data, data.length - i, KW_IV_LEN, MAX_KW_PKCS5PAD_LEN);
             testWrap(c, data, data.length - i, KW_IV_LEN, MAX_KW_PKCS5PAD_LEN);
         }
@@ -176,7 +197,9 @@ public static void main(String[] argv) throws Exception {
         ALGO = "AES/KWP/NoPadding";
         System.out.println("Testing " + ALGO);
         c = Cipher.getInstance(ALGO, "SunJCE");
-        for (int i = 0; i < MAX_KWP_PAD_LEN; i++) {
+
+        // test all possible pad lengths, i.e. 0 - 7
+        for (int i = 0; i <= MAX_KWP_PAD_LEN; i++) {
             testEnc(c, data, data.length - i, KWP_IV_LEN, MAX_KWP_PAD_LEN);
             testWrap(c, data, data.length - i, KWP_IV_LEN, MAX_KWP_PAD_LEN);
         }