| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * Copyright (c) 1998, 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 javax.crypto; |
| |
| import java.util.*; |
| |
| import java.security.*; |
| import java.security.Provider.Service; |
| import java.security.spec.AlgorithmParameterSpec; |
| |
| import java.nio.ByteBuffer; |
| |
| import sun.security.jca.*; |
| import sun.security.jca.GetInstance.Instance; |
| |
| /** |
| * This class provides the functionality of a "Message Authentication Code" |
| * (MAC) algorithm. |
| * |
| * <p> A MAC provides a way to check |
| * the integrity of information transmitted over or stored in an unreliable |
| * medium, based on a secret key. Typically, message |
| * authentication codes are used between two parties that share a secret |
| * key in order to validate information transmitted between these |
| * parties. |
| * |
| * <p> A MAC mechanism that is based on cryptographic hash functions is |
| * referred to as HMAC. HMAC can be used with any cryptographic hash function, |
| * e.g., MD5 or SHA-1, in combination with a secret shared key. HMAC is |
| * specified in RFC 2104. |
| * |
| * <p> Android provides the following <code>Mac</code> algorithms: |
| * <table> |
| * <thead> |
| * <tr> |
| * <th>Algorithm</th> |
| * <th>Supported API Levels</th> |
| * </tr> |
| * </thead> |
| * <tbody> |
| * <tr> |
| * <td>AESCMAC</td> |
| * <td>31+</td> |
| * </tr> |
| * <tr class="deprecated"> |
| * <td>DESMAC</td> |
| * <td>1-8</td> |
| * </tr> |
| * <tr class="deprecated"> |
| * <td>DESMAC/CFB8</td> |
| * <td>1-8</td> |
| * </tr> |
| * <tr class="deprecated"> |
| * <td>DESedeMAC</td> |
| * <td>1-8</td> |
| * </tr> |
| * <tr class="deprecated"> |
| * <td>DESedeMAC/CFB8</td> |
| * <td>1-8</td> |
| * </tr> |
| * <tr class="deprecated"> |
| * <td>DESedeMAC64</td> |
| * <td>1-8</td> |
| * </tr> |
| * <tr class="deprecated"> |
| * <td>DESwithISO9797</td> |
| * <td>1-8</td> |
| * </tr> |
| * <tr> |
| * <td>HmacMD5</td> |
| * <td>1+</td> |
| * </tr> |
| * <tr> |
| * <td>HmacSHA1</td> |
| * <td>1+</td> |
| * </tr> |
| * <tr> |
| * <td>HmacSHA224</td> |
| * <td>1-8,22+</td> |
| * </tr> |
| * <tr> |
| * <td>HmacSHA256</td> |
| * <td>1+</td> |
| * </tr> |
| * <tr> |
| * <td>HmacSHA384</td> |
| * <td>1+</td> |
| * </tr> |
| * <tr> |
| * <td>HmacSHA512</td> |
| * <td>1+</td> |
| * </tr> |
| * <tr class="deprecated"> |
| * <td>ISO9797ALG3MAC</td> |
| * <td>1-8</td> |
| * </tr> |
| * <tr> |
| * <td>PBEwithHmacSHA</td> |
| * <td>1+</td> |
| * </tr> |
| * <tr> |
| * <td>PBEwithHmacSHA1</td> |
| * <td>1+</td> |
| * </tr> |
| * <tr class="deprecated"> |
| * <td>PBEwithHmacSHA224</td> |
| * <td>26-31</td> |
| * </tr> |
| * <tr class="deprecated"> |
| * <td>PBEwithHmacSHA256</td> |
| * <td>26-31</td> |
| * </tr> |
| * <tr class="deprecated"> |
| * <td>PBEwithHmacSHA384</td> |
| * <td>26-31</td> |
| * </tr> |
| * <tr class="deprecated"> |
| * <td>PBEwithHmacSHA512</td> |
| * <td>26-31</td> |
| * </tr> |
| * </tbody> |
| * </table> |
| * |
| * These algorithms are described in the |
| * <a href="{@docRoot}/../technotes/guides/security/StandardNames.html#Mac"> |
| * Mac section</a> of the |
| * Java Cryptography Architecture Standard Algorithm Name Documentation. |
| * |
| * @author Jan Luehe |
| * |
| * @since 1.4 |
| */ |
| |
| public class Mac implements Cloneable { |
| |
| // Android-removed: this debugging mechanism is not used in Android. |
| /* |
| private static final Debug debug = |
| Debug.getInstance("jca", "Mac"); |
| |
| private static final Debug pdebug = |
| Debug.getInstance("provider", "Provider"); |
| private static final boolean skipDebug = |
| Debug.isOn("engine=") && !Debug.isOn("mac"); |
| */ |
| |
| // The provider |
| private Provider provider; |
| |
| // The provider implementation (delegate) |
| private MacSpi spi; |
| |
| // The name of the MAC algorithm. |
| private final String algorithm; |
| |
| // Has this object been initialized? |
| private boolean initialized = false; |
| |
| // BEGIN Android-removed: Redo the provider selection logic to allow reselecting provider. |
| // When only the algorithm is specified, we want to allow the Mac provider for that |
| // algorithm to change if multiple providers exist and they support different subsets of |
| // keys. To that end, we don't hold an iterator and exhaust it when we need to choose |
| // a provider like the upstream implementation, we reestablish the list of providers |
| // each time. |
| /* |
| // next service to try in provider selection |
| // null once provider is selected |
| private Service firstService; |
| |
| // remaining services to try in provider selection |
| // null once provider is selected |
| private Iterator<Service> serviceIterator; |
| */ |
| // END Android-removed: Redo the provider selection logic to allow reselecting provider. |
| |
| private final Object lock; |
| |
| /** |
| * Creates a MAC object. |
| * |
| * @param macSpi the delegate |
| * @param provider the provider |
| * @param algorithm the algorithm |
| */ |
| protected Mac(MacSpi macSpi, Provider provider, String algorithm) { |
| this.spi = macSpi; |
| this.provider = provider; |
| this.algorithm = algorithm; |
| lock = null; |
| } |
| |
| // Android-changed: Remove Service and Iterator from constructor args. |
| private Mac(String algorithm) { |
| this.algorithm = algorithm; |
| lock = new Object(); |
| } |
| |
| /** |
| * Returns the algorithm name of this <code>Mac</code> object. |
| * |
| * <p>This is the same name that was specified in one of the |
| * <code>getInstance</code> calls that created this |
| * <code>Mac</code> object. |
| * |
| * @return the algorithm name of this <code>Mac</code> object. |
| */ |
| public final String getAlgorithm() { |
| return this.algorithm; |
| } |
| |
| /** |
| * Returns a <code>Mac</code> object that implements the |
| * specified MAC algorithm. |
| * |
| * <p> This method traverses the list of registered security Providers, |
| * starting with the most preferred Provider. |
| * A new Mac object encapsulating the |
| * MacSpi implementation from the first |
| * Provider that supports the specified algorithm is returned. |
| * |
| * <p> Note that the list of registered providers may be retrieved via |
| * the {@link Security#getProviders() Security.getProviders()} method. |
| * |
| * @param algorithm the standard name of the requested MAC algorithm. |
| * See the Mac section in the <a href= |
| * "{@docRoot}/../technotes/guides/security/StandardNames.html#Mac"> |
| * Java Cryptography Architecture Standard Algorithm Name Documentation</a> |
| * for information about standard algorithm names. |
| * |
| * @return the new <code>Mac</code> object. |
| * |
| * @exception NoSuchAlgorithmException if no Provider supports a |
| * MacSpi implementation for the |
| * specified algorithm. |
| * |
| * @see java.security.Provider |
| */ |
| public static final Mac getInstance(String algorithm) |
| throws NoSuchAlgorithmException { |
| List<Service> services = GetInstance.getServices("Mac", algorithm); |
| // make sure there is at least one service from a signed provider |
| Iterator<Service> t = services.iterator(); |
| while (t.hasNext()) { |
| Service s = t.next(); |
| if (JceSecurity.canUseProvider(s.getProvider()) == false) { |
| continue; |
| } |
| // Android-changed: Remove Service and Iterator from constructor args. |
| // return new Mac(s, t, algorithm); |
| return new Mac(algorithm); |
| } |
| throw new NoSuchAlgorithmException |
| ("Algorithm " + algorithm + " not available"); |
| } |
| |
| /** |
| * Returns a <code>Mac</code> object that implements the |
| * specified MAC algorithm. |
| * |
| * <p> A new Mac object encapsulating the |
| * MacSpi implementation from the specified provider |
| * is returned. The specified provider must be registered |
| * in the security provider list. |
| * |
| * <p> Note that the list of registered providers may be retrieved via |
| * the {@link Security#getProviders() Security.getProviders()} method. |
| * |
| * @param algorithm the standard name of the requested MAC algorithm. |
| * See the Mac section in the <a href= |
| * "{@docRoot}/../technotes/guides/security/StandardNames.html#Mac"> |
| * Java Cryptography Architecture Standard Algorithm Name Documentation</a> |
| * for information about standard algorithm names. |
| * |
| * @param provider the name of the provider. |
| * |
| * @return the new <code>Mac</code> object. |
| * |
| * @exception NoSuchAlgorithmException if a MacSpi |
| * implementation for the specified algorithm is not |
| * available from the specified provider. |
| * |
| * @exception NoSuchProviderException if the specified provider is not |
| * registered in the security provider list. |
| * |
| * @exception IllegalArgumentException if the <code>provider</code> |
| * is null or empty. |
| * |
| * @see java.security.Provider |
| */ |
| public static final Mac getInstance(String algorithm, String provider) |
| throws NoSuchAlgorithmException, NoSuchProviderException { |
| // Android-added: Check for Bouncy Castle deprecation |
| Providers.checkBouncyCastleDeprecation(provider, "Mac", algorithm); |
| Instance instance = JceSecurity.getInstance |
| ("Mac", MacSpi.class, algorithm, provider); |
| return new Mac((MacSpi)instance.impl, instance.provider, algorithm); |
| } |
| |
| /** |
| * Returns a <code>Mac</code> object that implements the |
| * specified MAC algorithm. |
| * |
| * <p> A new Mac object encapsulating the |
| * MacSpi implementation from the specified Provider |
| * object is returned. Note that the specified Provider object |
| * does not have to be registered in the provider list. |
| * |
| * @param algorithm the standard name of the requested MAC algorithm. |
| * See the Mac section in the <a href= |
| * "{@docRoot}/../technotes/guides/security/StandardNames.html#Mac"> |
| * Java Cryptography Architecture Standard Algorithm Name Documentation</a> |
| * for information about standard algorithm names. |
| * |
| * @param provider the provider. |
| * |
| * @return the new <code>Mac</code> object. |
| * |
| * @exception NoSuchAlgorithmException if a MacSpi |
| * implementation for the specified algorithm is not available |
| * from the specified Provider object. |
| * |
| * @exception IllegalArgumentException if the <code>provider</code> |
| * is null. |
| * |
| * @see java.security.Provider |
| */ |
| public static final Mac getInstance(String algorithm, Provider provider) |
| throws NoSuchAlgorithmException { |
| // Android-added: Check for Bouncy Castle deprecation |
| Providers.checkBouncyCastleDeprecation(provider, "Mac", algorithm); |
| Instance instance = JceSecurity.getInstance |
| ("Mac", MacSpi.class, algorithm, provider); |
| return new Mac((MacSpi)instance.impl, instance.provider, algorithm); |
| } |
| |
| // max number of debug warnings to print from chooseFirstProvider() |
| private static int warnCount = 10; |
| |
| /** |
| * Choose the Spi from the first provider available. Used if |
| * delayed provider selection is not possible because init() |
| * is not the first method called. |
| */ |
| void chooseFirstProvider() { |
| // Android-changed: Check if lock is null rather than removed serviceIterator field. |
| // if ((spi != null) || (serviceIterator == null)) { |
| if (spi != null || lock == null) { |
| return; |
| } |
| synchronized (lock) { |
| if (spi != null) { |
| return; |
| } |
| // Android-removed: this debugging mechanism is not used in Android. |
| /* |
| if (debug != null) { |
| int w = --warnCount; |
| if (w >= 0) { |
| debug.println("Mac.init() not first method " |
| + "called, disabling delayed provider selection"); |
| if (w == 0) { |
| debug.println("Further warnings of this type will " |
| + "be suppressed"); |
| } |
| new Exception("Call trace").printStackTrace(); |
| } |
| } |
| */ |
| Exception lastException = null; |
| // Android-changed: Provider selection; loop over a new list each time. |
| for (Service s : GetInstance.getServices("Mac", algorithm)) { |
| if (JceSecurity.canUseProvider(s.getProvider()) == false) { |
| continue; |
| } |
| try { |
| Object obj = s.newInstance(null); |
| if (obj instanceof MacSpi == false) { |
| continue; |
| } |
| spi = (MacSpi)obj; |
| provider = s.getProvider(); |
| // Android-removed: Provider selection; loop over a new list each time. |
| /* |
| // not needed any more |
| firstService = null; |
| serviceIterator = null; |
| */ |
| return; |
| } catch (NoSuchAlgorithmException e) { |
| lastException = e; |
| } |
| } |
| ProviderException e = new ProviderException |
| ("Could not construct MacSpi instance"); |
| if (lastException != null) { |
| e.initCause(lastException); |
| } |
| throw e; |
| } |
| } |
| |
| private void chooseProvider(Key key, AlgorithmParameterSpec params) |
| throws InvalidKeyException, InvalidAlgorithmParameterException { |
| synchronized (lock) { |
| // Android-changed: Use the currently-selected provider only if no key was provided. |
| // if (spi != null) { |
| if (spi != null && (key == null || lock == null)) { |
| spi.engineInit(key, params); |
| return; |
| } |
| Exception lastException = null; |
| // Android-changed: Provider selection; loop over a new list each time. |
| for (Service s : GetInstance.getServices("Mac", algorithm)) { |
| // if provider says it does not support this key, ignore it |
| if (s.supportsParameter(key) == false) { |
| continue; |
| } |
| if (JceSecurity.canUseProvider(s.getProvider()) == false) { |
| continue; |
| } |
| try { |
| MacSpi spi = (MacSpi)s.newInstance(null); |
| spi.engineInit(key, params); |
| provider = s.getProvider(); |
| this.spi = spi; |
| // Android-removed: Provider selection; loop over a new list each time. |
| /* |
| firstService = null; |
| serviceIterator = null; |
| */ |
| return; |
| } catch (Exception e) { |
| // NoSuchAlgorithmException from newInstance() |
| // InvalidKeyException from init() |
| // RuntimeException (ProviderException) from init() |
| if (lastException == null) { |
| lastException = e; |
| } |
| } |
| } |
| // no working provider found, fail |
| if (lastException instanceof InvalidKeyException) { |
| throw (InvalidKeyException)lastException; |
| } |
| if (lastException instanceof InvalidAlgorithmParameterException) { |
| throw (InvalidAlgorithmParameterException)lastException; |
| } |
| if (lastException instanceof RuntimeException) { |
| throw (RuntimeException)lastException; |
| } |
| String kName = (key != null) ? key.getClass().getName() : "(null)"; |
| throw new InvalidKeyException |
| ("No installed provider supports this key: " |
| + kName, lastException); |
| } |
| } |
| |
| /** |
| * Returns the provider of this <code>Mac</code> object. |
| * |
| * @return the provider of this <code>Mac</code> object. |
| */ |
| public final Provider getProvider() { |
| chooseFirstProvider(); |
| return this.provider; |
| } |
| |
| /** |
| * Returns the length of the MAC in bytes. |
| * |
| * @return the MAC length in bytes. |
| */ |
| public final int getMacLength() { |
| chooseFirstProvider(); |
| return spi.engineGetMacLength(); |
| } |
| |
| /** |
| * Initializes this <code>Mac</code> object with the given key. |
| * |
| * @param key the key. |
| * |
| * @exception InvalidKeyException if the given key is inappropriate for |
| * initializing this MAC. |
| */ |
| public final void init(Key key) throws InvalidKeyException { |
| try { |
| // Android-changed: Use the currently-selected provider only if no key was provided. |
| // if (spi != null) { |
| if (spi != null && (key == null || lock == null)) { |
| spi.engineInit(key, null); |
| } else { |
| chooseProvider(key, null); |
| } |
| } catch (InvalidAlgorithmParameterException e) { |
| throw new InvalidKeyException("init() failed", e); |
| } |
| initialized = true; |
| |
| // Android-removed: this debugging mechanism is not used in Android. |
| /* |
| if (!skipDebug && pdebug != null) { |
| pdebug.println("Mac." + algorithm + " algorithm from: " + |
| this.provider.getName()); |
| } |
| */ |
| } |
| |
| /** |
| * Initializes this <code>Mac</code> object with the given key and |
| * algorithm parameters. |
| * |
| * @param key the key. |
| * @param params the algorithm parameters. |
| * |
| * @exception InvalidKeyException if the given key is inappropriate for |
| * initializing this MAC. |
| * @exception InvalidAlgorithmParameterException if the given algorithm |
| * parameters are inappropriate for this MAC. |
| */ |
| public final void init(Key key, AlgorithmParameterSpec params) |
| throws InvalidKeyException, InvalidAlgorithmParameterException { |
| // Android-changed: Use the currently-selected provider only if no key was provided. |
| // if (spi != null) { |
| if (spi != null && (key == null || lock == null)) { |
| spi.engineInit(key, params); |
| } else { |
| chooseProvider(key, params); |
| } |
| initialized = true; |
| |
| // Android-removed: this debugging mechanism is not used in Android. |
| /* |
| if (!skipDebug && pdebug != null) { |
| pdebug.println("Mac." + algorithm + " algorithm from: " + |
| this.provider.getName()); |
| } |
| */ |
| } |
| |
| /** |
| * Processes the given byte. |
| * |
| * @param input the input byte to be processed. |
| * |
| * @exception IllegalStateException if this <code>Mac</code> has not been |
| * initialized. |
| */ |
| public final void update(byte input) throws IllegalStateException { |
| chooseFirstProvider(); |
| if (initialized == false) { |
| throw new IllegalStateException("MAC not initialized"); |
| } |
| spi.engineUpdate(input); |
| } |
| |
| /** |
| * Processes the given array of bytes. |
| * |
| * @param input the array of bytes to be processed. |
| * |
| * @exception IllegalStateException if this <code>Mac</code> has not been |
| * initialized. |
| */ |
| public final void update(byte[] input) throws IllegalStateException { |
| chooseFirstProvider(); |
| if (initialized == false) { |
| throw new IllegalStateException("MAC not initialized"); |
| } |
| if (input != null) { |
| spi.engineUpdate(input, 0, input.length); |
| } |
| } |
| |
| /** |
| * Processes the first <code>len</code> bytes in <code>input</code>, |
| * starting at <code>offset</code> inclusive. |
| * |
| * @param input the input buffer. |
| * @param offset the offset in <code>input</code> where the input starts. |
| * @param len the number of bytes to process. |
| * |
| * @exception IllegalStateException if this <code>Mac</code> has not been |
| * initialized. |
| */ |
| public final void update(byte[] input, int offset, int len) |
| throws IllegalStateException { |
| chooseFirstProvider(); |
| if (initialized == false) { |
| throw new IllegalStateException("MAC not initialized"); |
| } |
| |
| if (input != null) { |
| if ((offset < 0) || (len > (input.length - offset)) || (len < 0)) |
| throw new IllegalArgumentException("Bad arguments"); |
| spi.engineUpdate(input, offset, len); |
| } |
| } |
| |
| /** |
| * Processes <code>input.remaining()</code> bytes in the ByteBuffer |
| * <code>input</code>, starting at <code>input.position()</code>. |
| * Upon return, the buffer's position will be equal to its limit; |
| * its limit will not have changed. |
| * |
| * @param input the ByteBuffer |
| * |
| * @exception IllegalStateException if this <code>Mac</code> has not been |
| * initialized. |
| * @since 1.5 |
| */ |
| public final void update(ByteBuffer input) { |
| chooseFirstProvider(); |
| if (initialized == false) { |
| throw new IllegalStateException("MAC not initialized"); |
| } |
| if (input == null) { |
| throw new IllegalArgumentException("Buffer must not be null"); |
| } |
| spi.engineUpdate(input); |
| } |
| |
| /** |
| * Finishes the MAC operation. |
| * |
| * <p>A call to this method resets this <code>Mac</code> object to the |
| * state it was in when previously initialized via a call to |
| * <code>init(Key)</code> or |
| * <code>init(Key, AlgorithmParameterSpec)</code>. |
| * That is, the object is reset and available to generate another MAC from |
| * the same key, if desired, via new calls to <code>update</code> and |
| * <code>doFinal</code>. |
| * (In order to reuse this <code>Mac</code> object with a different key, |
| * it must be reinitialized via a call to <code>init(Key)</code> or |
| * <code>init(Key, AlgorithmParameterSpec)</code>. |
| * |
| * @return the MAC result. |
| * |
| * @exception IllegalStateException if this <code>Mac</code> has not been |
| * initialized. |
| */ |
| public final byte[] doFinal() throws IllegalStateException { |
| chooseFirstProvider(); |
| if (initialized == false) { |
| throw new IllegalStateException("MAC not initialized"); |
| } |
| byte[] mac = spi.engineDoFinal(); |
| spi.engineReset(); |
| return mac; |
| } |
| |
| /** |
| * Finishes the MAC operation. |
| * |
| * <p>A call to this method resets this <code>Mac</code> object to the |
| * state it was in when previously initialized via a call to |
| * <code>init(Key)</code> or |
| * <code>init(Key, AlgorithmParameterSpec)</code>. |
| * That is, the object is reset and available to generate another MAC from |
| * the same key, if desired, via new calls to <code>update</code> and |
| * <code>doFinal</code>. |
| * (In order to reuse this <code>Mac</code> object with a different key, |
| * it must be reinitialized via a call to <code>init(Key)</code> or |
| * <code>init(Key, AlgorithmParameterSpec)</code>. |
| * |
| * <p>The MAC result is stored in <code>output</code>, starting at |
| * <code>outOffset</code> inclusive. |
| * |
| * @param output the buffer where the MAC result is stored |
| * @param outOffset the offset in <code>output</code> where the MAC is |
| * stored |
| * |
| * @exception ShortBufferException if the given output buffer is too small |
| * to hold the result |
| * @exception IllegalStateException if this <code>Mac</code> has not been |
| * initialized. |
| */ |
| public final void doFinal(byte[] output, int outOffset) |
| throws ShortBufferException, IllegalStateException |
| { |
| chooseFirstProvider(); |
| if (initialized == false) { |
| throw new IllegalStateException("MAC not initialized"); |
| } |
| int macLen = getMacLength(); |
| if (output == null || output.length-outOffset < macLen) { |
| throw new ShortBufferException |
| ("Cannot store MAC in output buffer"); |
| } |
| byte[] mac = doFinal(); |
| System.arraycopy(mac, 0, output, outOffset, macLen); |
| return; |
| } |
| |
| /** |
| * Processes the given array of bytes and finishes the MAC operation. |
| * |
| * <p>A call to this method resets this <code>Mac</code> object to the |
| * state it was in when previously initialized via a call to |
| * <code>init(Key)</code> or |
| * <code>init(Key, AlgorithmParameterSpec)</code>. |
| * That is, the object is reset and available to generate another MAC from |
| * the same key, if desired, via new calls to <code>update</code> and |
| * <code>doFinal</code>. |
| * (In order to reuse this <code>Mac</code> object with a different key, |
| * it must be reinitialized via a call to <code>init(Key)</code> or |
| * <code>init(Key, AlgorithmParameterSpec)</code>. |
| * |
| * @param input data in bytes |
| * @return the MAC result. |
| * |
| * @exception IllegalStateException if this <code>Mac</code> has not been |
| * initialized. |
| */ |
| public final byte[] doFinal(byte[] input) throws IllegalStateException |
| { |
| chooseFirstProvider(); |
| if (initialized == false) { |
| throw new IllegalStateException("MAC not initialized"); |
| } |
| update(input); |
| return doFinal(); |
| } |
| |
| /** |
| * Resets this <code>Mac</code> object. |
| * |
| * <p>A call to this method resets this <code>Mac</code> object to the |
| * state it was in when previously initialized via a call to |
| * <code>init(Key)</code> or |
| * <code>init(Key, AlgorithmParameterSpec)</code>. |
| * That is, the object is reset and available to generate another MAC from |
| * the same key, if desired, via new calls to <code>update</code> and |
| * <code>doFinal</code>. |
| * (In order to reuse this <code>Mac</code> object with a different key, |
| * it must be reinitialized via a call to <code>init(Key)</code> or |
| * <code>init(Key, AlgorithmParameterSpec)</code>. |
| */ |
| public final void reset() { |
| chooseFirstProvider(); |
| spi.engineReset(); |
| } |
| |
| /** |
| * Returns a clone if the provider implementation is cloneable. |
| * |
| * @return a clone if the provider implementation is cloneable. |
| * |
| * @exception CloneNotSupportedException if this is called on a |
| * delegate that does not support <code>Cloneable</code>. |
| */ |
| public final Object clone() throws CloneNotSupportedException { |
| chooseFirstProvider(); |
| Mac that = (Mac)super.clone(); |
| that.spi = (MacSpi)this.spi.clone(); |
| return that; |
| } |
| |
| // BEGIN Android-added: Allow access to the current SPI for testing purposes. |
| /** |
| * Returns the {@code MacSpi} backing this {@code Mac} or {@code null} if no {@code MacSpi} is |
| * backing this {@code Mac}. |
| * |
| * @hide |
| */ |
| public MacSpi getCurrentSpi() { |
| return spi; |
| } |
| // END Android-added: Allow access to the current SPI for testing purposes. |
| } |
