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/*
* 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.
*
* 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.
*
*
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.
*
*
Android provides the following Mac algorithms:
*
*
*
* Algorithm
* Supported API Levels
*
*
*
*
* DESMAC
* 1-8
*
*
* DESMAC/CFB8
* 1-8
*
*
* DESedeMAC
* 1-8
*
*
* DESedeMAC/CFB8
* 1-8
*
*
* DESedeMAC64
* 1-8
*
*
* DESwithISO9797
* 1-8
*
*
* HmacMD5
* 1+
*
*
* HmacSHA1
* 1+
*
*
* HmacSHA224
* 1-8,22+
*
*
* HmacSHA256
* 1+
*
*
* HmacSHA384
* 1+
*
*
* HmacSHA512
* 1+
*
*
* ISO9797ALG3MAC
* 1-8
*
*
* PBEwithHmacSHA
* 1+
*
*
* PBEwithHmacSHA1
* 1+
*
*
* PBEwithHmacSHA224
* 26+
*
*
* PBEwithHmacSHA256
* 26+
*
*
* PBEwithHmacSHA384
* 26+
*
*
* PBEwithHmacSHA512
* 26+
*
*
*
*
* These algorithms are described in the
*
* Mac section 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 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 Mac object.
*
* This is the same name that was specified in one of the
* getInstance calls that created this
* Mac object.
*
* @return the algorithm name of this Mac object.
*/
public final String getAlgorithm() {
return this.algorithm;
}
/**
* Returns a Mac object that implements the
* specified MAC algorithm.
*
*
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.
*
*
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
* Java Cryptography Architecture Standard Algorithm Name Documentation
* for information about standard algorithm names.
*
* @return the new Mac 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 services = GetInstance.getServices("Mac", algorithm);
// make sure there is at least one service from a signed provider
Iterator 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 Mac object that implements the
* specified MAC algorithm.
*
* 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.
*
*
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
* Java Cryptography Architecture Standard Algorithm Name Documentation
* for information about standard algorithm names.
*
* @param provider the name of the provider.
*
* @return the new Mac 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 provider
* 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 Mac object that implements the
* specified MAC algorithm.
*
*
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
* Java Cryptography Architecture Standard Algorithm Name Documentation
* for information about standard algorithm names.
*
* @param provider the provider.
*
* @return the new Mac object.
*
* @exception NoSuchAlgorithmException if a MacSpi
* implementation for the specified algorithm is not available
* from the specified Provider object.
*
* @exception IllegalArgumentException if the provider
* 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 Mac object.
*
* @return the provider of this Mac 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 Mac 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 Mac 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 Mac 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 Mac 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 len bytes in input,
* starting at offset inclusive.
*
* @param input the input buffer.
* @param offset the offset in input where the input starts.
* @param len the number of bytes to process.
*
* @exception IllegalStateException if this Mac 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 input.remaining() bytes in the ByteBuffer
* input, starting at input.position().
* 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 Mac 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.
*
*
A call to this method resets this Mac object to the
* state it was in when previously initialized via a call to
* init(Key) or
* init(Key, AlgorithmParameterSpec).
* That is, the object is reset and available to generate another MAC from
* the same key, if desired, via new calls to update and
* doFinal.
* (In order to reuse this Mac object with a different key,
* it must be reinitialized via a call to init(Key) or
* init(Key, AlgorithmParameterSpec).
*
* @return the MAC result.
*
* @exception IllegalStateException if this Mac 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.
*
*
A call to this method resets this Mac object to the
* state it was in when previously initialized via a call to
* init(Key) or
* init(Key, AlgorithmParameterSpec).
* That is, the object is reset and available to generate another MAC from
* the same key, if desired, via new calls to update and
* doFinal.
* (In order to reuse this Mac object with a different key,
* it must be reinitialized via a call to init(Key) or
* init(Key, AlgorithmParameterSpec).
*
*
The MAC result is stored in output, starting at
* outOffset inclusive.
*
* @param output the buffer where the MAC result is stored
* @param outOffset the offset in output where the MAC is
* stored
*
* @exception ShortBufferException if the given output buffer is too small
* to hold the result
* @exception IllegalStateException if this Mac 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.
*
*
A call to this method resets this Mac object to the
* state it was in when previously initialized via a call to
* init(Key) or
* init(Key, AlgorithmParameterSpec).
* That is, the object is reset and available to generate another MAC from
* the same key, if desired, via new calls to update and
* doFinal.
* (In order to reuse this Mac object with a different key,
* it must be reinitialized via a call to init(Key) or
* init(Key, AlgorithmParameterSpec).
*
* @param input data in bytes
* @return the MAC result.
*
* @exception IllegalStateException if this Mac 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 Mac object.
*
*
A call to this method resets this Mac object to the
* state it was in when previously initialized via a call to
* init(Key) or
* init(Key, AlgorithmParameterSpec).
* That is, the object is reset and available to generate another MAC from
* the same key, if desired, via new calls to update and
* doFinal.
* (In order to reuse this Mac object with a different key,
* it must be reinitialized via a call to init(Key) or
* init(Key, AlgorithmParameterSpec).
*/
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 Cloneable.
*/
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.
}