/*
*
* 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
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package javax.crypto;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.regex.*;
import static java.util.Locale.ENGLISH;
import java.security.*;
import java.security.Provider.Service;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidParameterSpecException;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import javax.crypto.spec.*;
import java.nio.ByteBuffer;
import java.nio.ReadOnlyBufferException;
import sun.security.jca.*;
/**
* This class provides the functionality of a cryptographic cipher for
* encryption and decryption.
* Extension (JCE) framework.
*
* <p>In order to create a Cipher object, the application calls the
* Cipher's <code>getInstance</code> method, and passes the name of the
* requested <i>transformation</i> to it. Optionally, the name of a provider
* may be specified.
*
* <p>A <i>transformation</i> is a string that describes the operation (or
* set of operations) to be performed on the given input, to produce some
* output. A transformation always includes the name of a cryptographic
* algorithm (e.g., <i>DES</i>), and may be followed by a feedback mode and
* padding scheme.
*
* <p> A transformation is of the form:
*
* <ul>
* <li>"<i>algorithm/mode/padding</i>" or
*
* <li>"<i>algorithm</i>"
* </ul>
*
* <P> (in the latter case,
* provider-specific default values for the mode and padding scheme are used).
* For example, the following is a valid transformation:
*
* <pre>
* Cipher c = Cipher.getInstance("<i>DES/CBC/PKCS5Padding</i>");
* </pre>
*
* Using modes such as <code>CFB</code> and <code>OFB</code>, block
* ciphers can encrypt data in units smaller than the cipher's actual
* block size. When requesting such a mode, you may optionally specify
* the number of bits to be processed at a time by appending this number
* to the mode name as shown in the "<code>DES/CFB8/NoPadding</code>" and
* "<code>DES/OFB32/PKCS5Padding</code>" transformations. If no such
* number is specified, a provider-specific default is used. (For
* example, the SunJCE provider uses a default of 64 bits for DES.)
* Thus, block ciphers can be turned into byte-oriented stream ciphers by
* using an 8 bit mode such as CFB8 or OFB8.
* <p>
* Modes such as Authenticated Encryption with Associated Data (AEAD)
* provide authenticity assurances for both confidential data and
* Additional Associated Data (AAD) that is not encrypted. (Please see
* <a href="http://www.ietf.org/rfc/rfc5116.txt"> RFC 5116 </a> for more
* information on AEAD and AEAD algorithms such as GCM/CCM.) Both
* confidential and AAD data can be used when calculating the
* authentication tag (similar to a {@link Mac}). This tag is appended
* to the ciphertext during encryption, and is verified on decryption.
* <p>
* AEAD modes such as GCM/CCM perform all AAD authenticity calculations
* before starting the ciphertext authenticity calculations. To avoid
* implementations having to internally buffer ciphertext, all AAD data
* must be supplied to GCM/CCM implementations (via the {@code
* updateAAD} methods) <b>before</b> the ciphertext is processed (via
* the {@code update} and {@code doFinal} methods).
* <p>
* Note that GCM mode has a uniqueness requirement on IVs used in
* encryption with a given key. When IVs are repeated for GCM
* encryption, such usages are subject to forgery attacks. Thus, after
* each encryption operation using GCM mode, callers should re-initialize
* the cipher objects with GCM parameters which has a different IV value.
* <pre>
* GCMParameterSpec s = ...;
* cipher.init(..., s);
*
* // If the GCM parameters were generated by the provider, it can
* // be retrieved by:
* // cipher.getParameters().getParameterSpec(GCMParameterSpec.class);
*
* cipher.updateAAD(...); // AAD
* cipher.update(...); // Multi-part update
* cipher.doFinal(...); // conclusion of operation
*
* // Use a different IV value for every encryption
* byte[] newIv = ...;
* s = new GCMParameterSpec(s.getTLen(), newIv);
* cipher.init(..., s);
* ...
*
* </pre>
* <p> Android provides the following <code>Cipher</code> transformations:
* <table>
* <thead>
* <tr>
* <th>Algorithm</th>
* <th>Modes</th>
* <th>Paddings</th>
* <th>Supported API Levels</th>
* </tr>
* </thead>
* <tbody>
* <tr>
* <td rowspan="2">AES</td>
* <td>CBC<br>CFB<br>CTR<br>CTS<br>ECB<br>OFB</td>
* <td>ISO10126Padding<br>NoPadding<br>PKCS5Padding</td>
* <td>1+</td>
* </tr>
* <tr>
* <td>GCM</td>
* <td>NOPADDING</td>
* <td>10+</td>
* </tr>
* <tr>
* <td rowspan="2">AES_128</td>
* <td>CBC<br>ECB</td>
* <td>NoPadding<br>PKCS5Padding</td>
* <td>26+</td>
* </tr>
* <tr>
* <td>GCM</td>
* <td>NoPadding</td>
* <td>26+</td>
* </tr>
* <tr>
* <td rowspan="2">AES_256</td>
* <td>CBC<br>ECB</td>
* <td>NoPadding<br>PKCS5Padding</td>
* <td>26+</td>
* </tr>
* <tr>
* <td>GCM</td>
* <td>NoPadding</td>
* <td>26+</td>
* </tr>
* <tr>
* <td>ARC4</td>
* <td>ECB</td>
* <td>NoPadding</td>
* <td>10+</td>
* </tr>
* <tr>
* <td>BLOWFISH</td>
* <td>CBC<br>CFB<br>CTR<br>CTS<br>ECB<br>OFB</td>
* <td>ISO10126Padding<br>NoPadding<br>PKCS5Padding</td>
* <td>10+</td>
* </tr>
* <tr>
* <td>DES</td>
* <td>CBC<br>CFB<br>CTR<br>CTS<br>ECB<br>OFB</td>
* <td>ISO10126Padding<br>NoPadding<br>PKCS5Padding</td>
* <td>1+</td>
* </tr>
* <tr>
* <td>DESede</td>
* <td>CBC<br>CFB<br>CTR<br>CTS<br>ECB<br>OFB</td>
* <td>ISO10126Padding<br>NoPadding<br>PKCS5Padding</td>
* <td>1+</td>
* </tr>
* <tr>
* <td rowspan="3">RSA</td>
* <td rowspan="3">ECB<br>NONE</td>
* <td>NoPadding<br>OAEPPadding<br>PKCS1Padding</td>
* <td>1+</td>
* </tr>
* <tr>
* <td>OAEPwithSHA-1andMGF1Padding<br>OAEPwithSHA-256andMGF1Padding</td>
* <td>10+</td>
* </tr>
* <tr>
* <td>OAEPwithSHA-224andMGF1Padding<br>OAEPwithSHA-384andMGF1Padding<br>OAEPwithSHA-512andMGF1Padding</td>
* <td>23+</td>
* </tr>
* </tbody>
* </table>
*
* These transformations are described in the
* <a href="{@docRoot}openjdk-redirect.html?v=8&path=/technotes/guides/security/StandardNames.html#Cipher">
* Cipher section</a> of the
* Java Cryptography Architecture Standard Algorithm Name Documentation.
*
* @author Jan Luehe
* @see KeyGenerator
* @see SecretKey
* @since 1.4
*/
public class Cipher {
// Android-removed: this debugging mechanism is not used in Android.
/*
private static final Debug debug =
Debug.getInstance("jca", "Cipher");
private static final Debug pdebug =
Debug.getInstance("provider", "Provider");
private static final boolean skipDebug =
Debug.isOn("engine=") && !Debug.isOn("cipher");
*/
/**
* Constant used to initialize cipher to encryption mode.
*/
public static final int ENCRYPT_MODE = 1;
/**
* Constant used to initialize cipher to decryption mode.
*/
public static final int DECRYPT_MODE = 2;
/**
* Constant used to initialize cipher to key-wrapping mode.
*/
public static final int WRAP_MODE = 3;
/**
* Constant used to initialize cipher to key-unwrapping mode.
*/
public static final int UNWRAP_MODE = 4;
/**
* Constant used to indicate the to-be-unwrapped key is a "public key".
*/
public static final int PUBLIC_KEY = 1;
/**
* Constant used to indicate the to-be-unwrapped key is a "private key".
*/
public static final int PRIVATE_KEY = 2;
/**
* Constant used to indicate the to-be-unwrapped key is a "secret key".
*/
public static final int SECRET_KEY = 3;
// The provider
private Provider provider;
// The provider implementation (delegate)
private CipherSpi spi;
// The transformation
final private String transformation;
// The tokenized version of transformation
final private String[] tokenizedTransformation;
// The exemption mechanism that needs to be enforced
private ExemptionMechanism exmech;
// Flag which indicates whether or not this cipher has been initialized
private boolean initialized = false;
// The operation mode - store the operation mode after the
// cipher has been initialized.
private int opmode = 0;
// The OID for the KeyUsage extension in an X.509 v3 certificate
private static final String KEY_USAGE_EXTENSION_OID = "2.5.29.15";
private final SpiAndProviderUpdater spiAndProviderUpdater;
/**
* Creates a Cipher object.
*
* @param cipherSpi the delegate
* @param provider the provider
* @param transformation the transformation
*/
protected Cipher(CipherSpi cipherSpi,
Provider provider,
String transformation) {
if (cipherSpi == null) {
throw new NullPointerException("cipherSpi == null");
}
if (!(cipherSpi instanceof NullCipherSpi) && provider == null) {
throw new NullPointerException("provider == null");
}
this.spi = cipherSpi;
this.provider = provider;
this.transformation = transformation;
this.tokenizedTransformation = null;
this.spiAndProviderUpdater =
new SpiAndProviderUpdater(provider, cipherSpi);
}
private Cipher(CipherSpi cipherSpi,
Provider provider,
String transformation,
String[] tokenizedTransformation) {
this.spi = cipherSpi;
this.provider = provider;
this.transformation = transformation;
this.tokenizedTransformation = tokenizedTransformation;
this.spiAndProviderUpdater =
new SpiAndProviderUpdater(provider, cipherSpi);
}
private static String[] tokenizeTransformation(String transformation)
throws NoSuchAlgorithmException {
if (transformation == null || transformation.isEmpty()) {
throw new NoSuchAlgorithmException("No transformation given");
}
/*
* array containing the components of a Cipher transformation:
*
* index 0: algorithm component (e.g., DES)
* index 1: feedback component (e.g., CFB)
* index 2: padding component (e.g., PKCS5Padding)
*/
String[] parts = new String[3];
int count = 0;
StringTokenizer parser = new StringTokenizer(transformation, "/");
try {
while (parser.hasMoreTokens() && count < 3) {
parts[count++] = parser.nextToken().trim();
}
if (count == 0 || count == 2 || parser.hasMoreTokens()) {
throw new NoSuchAlgorithmException("Invalid transformation"
+ " format:" +
transformation);
}
} catch (NoSuchElementException e) {
throw new NoSuchAlgorithmException("Invalid transformation " +
"format:" + transformation);
}
if ((parts[0] == null) || (parts[0].length() == 0)) {
throw new NoSuchAlgorithmException("Invalid transformation:" +
"algorithm not specified-"
+ transformation);
}
return parts;
}
/**
* Returns a <code>Cipher</code> object that implements the specified
* transformation.
*
* <p> This method traverses the list of registered security Providers,
* starting with the most preferred Provider.
* A new Cipher object encapsulating the
* CipherSpi 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 transformation the name of the transformation, e.g.,
* <i>DES/CBC/PKCS5Padding</i>.
* See the Cipher section in the <a href=
* "{@docRoot}openjdk-redirect.html?v=8&path=/technotes/guides/security/StandardNames.html#Cipher">
* Java Cryptography Architecture Standard Algorithm Name Documentation</a>
* for information about standard transformation names.
*
* @return a cipher that implements the requested transformation.
*
* @exception NoSuchAlgorithmException if <code>transformation</code>
* is null, empty, in an invalid format,
* or if no Provider supports a CipherSpi implementation for the
* specified algorithm.
*
* @exception NoSuchPaddingException if <code>transformation</code>
* contains a padding scheme that is not available.
*
* @see java.security.Provider
*/
public static final Cipher getInstance(String transformation)
throws NoSuchAlgorithmException, NoSuchPaddingException
{
return createCipher(transformation, null);
}
/**
* Returns a <code>Cipher</code> object that implements the specified
* transformation.
*
* <p> A new Cipher object encapsulating the
* CipherSpi 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 transformation the name of the transformation,
* e.g., <i>DES/CBC/PKCS5Padding</i>.
* See the Cipher section in the <a href=
* "{@docRoot}openjdk-redirect.html?v=8&path=/technotes/guides/security/StandardNames.html#Cipher">
* Java Cryptography Architecture Standard Algorithm Name Documentation</a>
* for information about standard transformation names.
*
* @param provider the name of the provider.
*
* @return a cipher that implements the requested transformation.
*
* @exception NoSuchAlgorithmException if <code>transformation</code>
* is null, empty, in an invalid format,
* or if a CipherSpi 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 NoSuchPaddingException if <code>transformation</code>
* contains a padding scheme that is not available.
*
* @exception IllegalArgumentException if the <code>provider</code>
* is null or empty.
*
* @see java.security.Provider
*/
public static final Cipher getInstance(String transformation,
String provider)
throws NoSuchAlgorithmException, NoSuchProviderException,
NoSuchPaddingException
{
if ((provider == null) || (provider.length() == 0)) {
throw new IllegalArgumentException("Missing provider");
}
Provider p = Security.getProvider(provider);
if (p == null) {
throw new NoSuchProviderException("No such provider: " +
provider);
}
return createCipher(transformation, p);
}
/**
* Returns a <code>Cipher</code> object that implements the specified
* transformation.
*
* <p> A new Cipher object encapsulating the
* CipherSpi 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 transformation the name of the transformation,
* e.g., <i>DES/CBC/PKCS5Padding</i>.
* See the Cipher section in the <a href=
* "{@docRoot}openjdk-redirect.html?v=8&path=/technotes/guides/security/StandardNames.html#Cipher">
* Java Cryptography Architecture Standard Algorithm Name Documentation</a>
* for information about standard transformation names.
*
* @param provider the provider.
*
* @return a cipher that implements the requested transformation.
*
* @exception NoSuchAlgorithmException if <code>transformation</code>
* is null, empty, in an invalid format,
* or if a CipherSpi implementation for the specified algorithm
* is not available from the specified Provider object.
*
* @exception NoSuchPaddingException if <code>transformation</code>
* contains a padding scheme that is not available.
*
* @exception IllegalArgumentException if the <code>provider</code>
* is null.
*
* @see java.security.Provider
*/
public static final Cipher getInstance(String transformation,
Provider provider)
throws NoSuchAlgorithmException, NoSuchPaddingException
{
if (provider == null) {
throw new IllegalArgumentException("Missing provider");
}
return createCipher(transformation, provider);
}
static final Cipher createCipher(String transformation, Provider provider)
throws NoSuchAlgorithmException, NoSuchPaddingException {
String[] tokenizedTransformation = tokenizeTransformation(transformation);
CipherSpiAndProvider cipherSpiAndProvider = null;
try {
cipherSpiAndProvider =
tryCombinations(null /*params*/, provider, tokenizedTransformation);
} catch (InvalidKeyException | InvalidAlgorithmParameterException e) {
// Shouldn't happen.
throw new IllegalStateException("Key/Algorithm excepton despite not passing one", e);
}
if (cipherSpiAndProvider == null) {
if (provider == null) {
throw new NoSuchAlgorithmException("No provider found for " + transformation);
} else {
throw new NoSuchAlgorithmException("Provider " + provider.getName()
+ " does not provide " + transformation);
}
}
// exceptions and stuff
return new Cipher(null, provider, transformation, tokenizedTransformation);
}
/**
* 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 updateProviderIfNeeded() {
try {
spiAndProviderUpdater.updateAndGetSpiAndProvider(null, spi, provider);
} catch (Exception lastException) {
ProviderException e = new ProviderException
("Could not construct CipherSpi instance");
if (lastException != null) {
e.initCause(lastException);
}
throw e;
}
}
private void chooseProvider(InitType initType, int opmode, Key key,
AlgorithmParameterSpec paramSpec,
AlgorithmParameters params, SecureRandom random)
throws InvalidKeyException, InvalidAlgorithmParameterException {
try {
final InitParams initParams = new InitParams(initType, opmode, key, random,
paramSpec, params);
spiAndProviderUpdater.updateAndGetSpiAndProvider(initParams, spi, provider);
} catch (Exception lastException) {
// 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>Cipher</code> object.
*
* @return the provider of this <code>Cipher</code> object
*/
public final Provider getProvider() {
updateProviderIfNeeded();
return this.provider;
}
/**
* Returns the algorithm name of this <code>Cipher</code> object.
*
* <p>This is the same name that was specified in one of the
* <code>getInstance</code> calls that created this <code>Cipher</code>
* object..
*
* @return the algorithm name of this <code>Cipher</code> object.
*/
public final String getAlgorithm() {
return this.transformation;
}
/**
* Returns the block size (in bytes).
*
* @return the block size (in bytes), or 0 if the underlying algorithm is
* not a block cipher
*/
public final int getBlockSize() {
updateProviderIfNeeded();
return spi.engineGetBlockSize();
}
/**
* Returns the length in bytes that an output buffer would need to be in
* order to hold the result of the next <code>update</code> or
* <code>doFinal</code> operation, given the input length
* <code>inputLen</code> (in bytes).
*
* <p>This call takes into account any unprocessed (buffered) data from a
* previous <code>update</code> call, padding, and AEAD tagging.
*
* <p>The actual output length of the next <code>update</code> or
* <code>doFinal</code> call may be smaller than the length returned by
* this method.
*
* @param inputLen the input length (in bytes)
*
* @return the required output buffer size (in bytes)
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not yet been initialized)
*/
public final int getOutputSize(int inputLen) {
if (!initialized && !(this instanceof NullCipher)) {
throw new IllegalStateException("Cipher not initialized");
}
if (inputLen < 0) {
throw new IllegalArgumentException("Input size must be equal " +
"to or greater than zero");
}
updateProviderIfNeeded();
return spi.engineGetOutputSize(inputLen);
}
/**
* Returns the initialization vector (IV) in a new buffer.
*
* <p>This is useful in the case where a random IV was created,
* or in the context of password-based encryption or
* decryption, where the IV is derived from a user-supplied password.
*
* @return the initialization vector in a new buffer, or null if the
* underlying algorithm does not use an IV, or if the IV has not yet
* been set.
*/
public final byte[] getIV() {
updateProviderIfNeeded();
return spi.engineGetIV();
}
/**
* Returns the parameters used with this cipher.
*
* <p>The returned parameters may be the same that were used to initialize
* this cipher, or may contain a combination of default and random
* parameter values used by the underlying cipher implementation if this
* cipher requires algorithm parameters but was not initialized with any.
*
* @return the parameters used with this cipher, or null if this cipher
* does not use any parameters.
*/
public final AlgorithmParameters getParameters() {
updateProviderIfNeeded();
return spi.engineGetParameters();
}
/**
* Returns the exemption mechanism object used with this cipher.
*
* @return the exemption mechanism object used with this cipher, or
* null if this cipher does not use any exemption mechanism.
*/
public final ExemptionMechanism getExemptionMechanism() {
updateProviderIfNeeded();
return exmech;
}
// check if opmode is one of the defined constants
// throw InvalidParameterExeption if not
private static void checkOpmode(int opmode) {
if ((opmode < ENCRYPT_MODE) || (opmode > UNWRAP_MODE)) {
throw new InvalidParameterException("Invalid operation mode");
}
}
private static String getOpmodeString(int opmode) {
switch (opmode) {
case ENCRYPT_MODE:
return "encryption";
case DECRYPT_MODE:
return "decryption";
case WRAP_MODE:
return "key wrapping";
case UNWRAP_MODE:
return "key unwrapping";
default:
return "";
}
}
/**
* Initializes this cipher with a key.
*
* <p>The cipher is initialized for one of the following four operations:
* encryption, decryption, key wrapping or key unwrapping, depending
* on the value of <code>opmode</code>.
*
* <p>If this cipher requires any algorithm parameters that cannot be
* derived from the given <code>key</code>, the underlying cipher
* implementation is supposed to generate the required parameters itself
* (using provider-specific default or random values) if it is being
* initialized for encryption or key wrapping, and raise an
* <code>InvalidKeyException</code> if it is being
* initialized for decryption or key unwrapping.
* The generated parameters can be retrieved using
* {@link #getParameters() getParameters} or
* {@link #getIV() getIV} (if the parameter is an IV).
*
* <p>If this cipher requires algorithm parameters that cannot be
* derived from the input parameters, and there are no reasonable
* provider-specific default values, initialization will
* necessarily fail.
*
* <p>If this cipher (including its underlying feedback or padding scheme)
* requires any random bytes (e.g., for parameter generation), it will get
* them using the {@link java.security.SecureRandom}
* implementation of the highest-priority
* installed provider as the source of randomness.
* (If none of the installed providers supply an implementation of
* SecureRandom, a system-provided source of randomness will be used.)
*
* <p>Note that when a Cipher object is initialized, it loses all
* previously-acquired state. In other words, initializing a Cipher is
* equivalent to creating a new instance of that Cipher and initializing
* it.
*
* @param opmode the operation mode of this cipher (this is one of
* the following:
* <code>ENCRYPT_MODE</code>, <code>DECRYPT_MODE</code>,
* <code>WRAP_MODE</code> or <code>UNWRAP_MODE</code>)
* @param key the key
*
* @exception InvalidKeyException if the given key is inappropriate for
* initializing this cipher, or requires
* algorithm parameters that cannot be
* determined from the given key, or if the given key has a keysize that
* exceeds the maximum allowable keysize (as determined from the
* configured jurisdiction policy files).
* @throws UnsupportedOperationException if (@code opmode} is
* {@code WRAP_MODE} or {@code UNWRAP_MODE} but the mode is not implemented
* by the underlying {@code CipherSpi}.
*/
public final void init(int opmode, Key key) throws InvalidKeyException {
init(opmode, key, JceSecurity.RANDOM);
}
/**
* Initializes this cipher with a key and a source of randomness.
*
* <p>The cipher is initialized for one of the following four operations:
* encryption, decryption, key wrapping or key unwrapping, depending
* on the value of <code>opmode</code>.
*
* <p>If this cipher requires any algorithm parameters that cannot be
* derived from the given <code>key</code>, the underlying cipher
* implementation is supposed to generate the required parameters itself
* (using provider-specific default or random values) if it is being
* initialized for encryption or key wrapping, and raise an
* <code>InvalidKeyException</code> if it is being
* initialized for decryption or key unwrapping.
* The generated parameters can be retrieved using
* {@link #getParameters() getParameters} or
* {@link #getIV() getIV} (if the parameter is an IV).
*
* <p>If this cipher requires algorithm parameters that cannot be
* derived from the input parameters, and there are no reasonable
* provider-specific default values, initialization will
* necessarily fail.
*
* <p>If this cipher (including its underlying feedback or padding scheme)
* requires any random bytes (e.g., for parameter generation), it will get
* them from <code>random</code>.
*
* <p>Note that when a Cipher object is initialized, it loses all
* previously-acquired state. In other words, initializing a Cipher is
* equivalent to creating a new instance of that Cipher and initializing
* it.
*
* @param opmode the operation mode of this cipher (this is one of the
* following:
* <code>ENCRYPT_MODE</code>, <code>DECRYPT_MODE</code>,
* <code>WRAP_MODE</code> or <code>UNWRAP_MODE</code>)
* @param key the encryption key
* @param random the source of randomness
*
* @exception InvalidKeyException if the given key is inappropriate for
* initializing this cipher, or requires
* algorithm parameters that cannot be
* determined from the given key, or if the given key has a keysize that
* exceeds the maximum allowable keysize (as determined from the
* configured jurisdiction policy files).
* @throws UnsupportedOperationException if (@code opmode} is
* {@code WRAP_MODE} or {@code UNWRAP_MODE} but the mode is not implemented
* by the underlying {@code CipherSpi}.
*/
public final void init(int opmode, Key key, SecureRandom random)
throws InvalidKeyException
{
initialized = false;
checkOpmode(opmode);
try {
chooseProvider(InitType.KEY, opmode, key, null, null, random);
} catch (InvalidAlgorithmParameterException e) {
// should never occur
throw new InvalidKeyException(e);
}
initialized = true;
this.opmode = opmode;
// Android-removed: this debugging mechanism is not used in Android.
/*
if (!skipDebug && pdebug != null) {
pdebug.println("Cipher." + transformation + " " +
getOpmodeString(opmode) + " algorithm from: " +
this.provider.getName());
}
*/
}
/**
* Initializes this cipher with a key and a set of algorithm
* parameters.
*
* <p>The cipher is initialized for one of the following four operations:
* encryption, decryption, key wrapping or key unwrapping, depending
* on the value of <code>opmode</code>.
*
* <p>If this cipher requires any algorithm parameters and
* <code>params</code> is null, the underlying cipher implementation is
* supposed to generate the required parameters itself (using
* provider-specific default or random values) if it is being
* initialized for encryption or key wrapping, and raise an
* <code>InvalidAlgorithmParameterException</code> if it is being
* initialized for decryption or key unwrapping.
* The generated parameters can be retrieved using
* {@link #getParameters() getParameters} or
* {@link #getIV() getIV} (if the parameter is an IV).
*
* <p>If this cipher requires algorithm parameters that cannot be
* derived from the input parameters, and there are no reasonable
* provider-specific default values, initialization will
* necessarily fail.
*
* <p>If this cipher (including its underlying feedback or padding scheme)
* requires any random bytes (e.g., for parameter generation), it will get
* them using the {@link java.security.SecureRandom}
* implementation of the highest-priority
* installed provider as the source of randomness.
* (If none of the installed providers supply an implementation of
* SecureRandom, a system-provided source of randomness will be used.)
*
* <p>Note that when a Cipher object is initialized, it loses all
* previously-acquired state. In other words, initializing a Cipher is
* equivalent to creating a new instance of that Cipher and initializing
* it.
*
* @param opmode the operation mode of this cipher (this is one of the
* following:
* <code>ENCRYPT_MODE</code>, <code>DECRYPT_MODE</code>,
* <code>WRAP_MODE</code> or <code>UNWRAP_MODE</code>)
* @param key the encryption key
* @param params the algorithm parameters
*
* @exception InvalidKeyException if the given key is inappropriate for
* initializing this cipher, or its keysize exceeds the maximum allowable
* keysize (as determined from the configured jurisdiction policy files).
* @exception InvalidAlgorithmParameterException if the given algorithm
* parameters are inappropriate for this cipher,
* or this cipher requires
* algorithm parameters and <code>params</code> is null, or the given
* algorithm parameters imply a cryptographic strength that would exceed
* the legal limits (as determined from the configured jurisdiction
* policy files).
* @throws UnsupportedOperationException if (@code opmode} is
* {@code WRAP_MODE} or {@code UNWRAP_MODE} but the mode is not implemented
* by the underlying {@code CipherSpi}.
*/
public final void init(int opmode, Key key, AlgorithmParameterSpec params)
throws InvalidKeyException, InvalidAlgorithmParameterException
{
init(opmode, key, params, JceSecurity.RANDOM);
}
/**
* Initializes this cipher with a key, a set of algorithm
* parameters, and a source of randomness.
*
* <p>The cipher is initialized for one of the following four operations:
* encryption, decryption, key wrapping or key unwrapping, depending
* on the value of <code>opmode</code>.
*
* <p>If this cipher requires any algorithm parameters and
* <code>params</code> is null, the underlying cipher implementation is
* supposed to generate the required parameters itself (using
* provider-specific default or random values) if it is being
* initialized for encryption or key wrapping, and raise an
* <code>InvalidAlgorithmParameterException</code> if it is being
* initialized for decryption or key unwrapping.
* The generated parameters can be retrieved using
* {@link #getParameters() getParameters} or
* {@link #getIV() getIV} (if the parameter is an IV).
*
* <p>If this cipher requires algorithm parameters that cannot be
* derived from the input parameters, and there are no reasonable
* provider-specific default values, initialization will
* necessarily fail.
*
* <p>If this cipher (including its underlying feedback or padding scheme)
* requires any random bytes (e.g., for parameter generation), it will get
* them from <code>random</code>.
*
* <p>Note that when a Cipher object is initialized, it loses all
* previously-acquired state. In other words, initializing a Cipher is
* equivalent to creating a new instance of that Cipher and initializing
* it.
*
* @param opmode the operation mode of this cipher (this is one of the
* following:
* <code>ENCRYPT_MODE</code>, <code>DECRYPT_MODE</code>,
* <code>WRAP_MODE</code> or <code>UNWRAP_MODE</code>)
* @param key the encryption key
* @param params the algorithm parameters
* @param random the source of randomness
*
* @exception InvalidKeyException if the given key is inappropriate for
* initializing this cipher, or its keysize exceeds the maximum allowable
* keysize (as determined from the configured jurisdiction policy files).
* @exception InvalidAlgorithmParameterException if the given algorithm
* parameters are inappropriate for this cipher,
* or this cipher requires
* algorithm parameters and <code>params</code> is null, or the given
* algorithm parameters imply a cryptographic strength that would exceed
* the legal limits (as determined from the configured jurisdiction
* policy files).
* @throws UnsupportedOperationException if (@code opmode} is
* {@code WRAP_MODE} or {@code UNWRAP_MODE} but the mode is not implemented
* by the underlying {@code CipherSpi}.
*/
public final void init(int opmode, Key key, AlgorithmParameterSpec params,
SecureRandom random)
throws InvalidKeyException, InvalidAlgorithmParameterException
{
initialized = false;
checkOpmode(opmode);
chooseProvider(InitType.ALGORITHM_PARAM_SPEC, opmode, key, params, null, random);
initialized = true;
this.opmode = opmode;
// Android-removed: this debugging mechanism is not used in Android.
/*
if (!skipDebug && pdebug != null) {
pdebug.println("Cipher." + transformation + " " +
getOpmodeString(opmode) + " algorithm from: " +
this.provider.getName());
}
*/
}
/**
* Initializes this cipher with a key and a set of algorithm
* parameters.
*
* <p>The cipher is initialized for one of the following four operations:
* encryption, decryption, key wrapping or key unwrapping, depending
* on the value of <code>opmode</code>.
*
* <p>If this cipher requires any algorithm parameters and
* <code>params</code> is null, the underlying cipher implementation is
* supposed to generate the required parameters itself (using
* provider-specific default or random values) if it is being
* initialized for encryption or key wrapping, and raise an
* <code>InvalidAlgorithmParameterException</code> if it is being
* initialized for decryption or key unwrapping.
* The generated parameters can be retrieved using
* {@link #getParameters() getParameters} or
* {@link #getIV() getIV} (if the parameter is an IV).
*
* <p>If this cipher requires algorithm parameters that cannot be
* derived from the input parameters, and there are no reasonable
* provider-specific default values, initialization will
* necessarily fail.
*
* <p>If this cipher (including its underlying feedback or padding scheme)
* requires any random bytes (e.g., for parameter generation), it will get
* them using the {@link java.security.SecureRandom}
* implementation of the highest-priority
* installed provider as the source of randomness.
* (If none of the installed providers supply an implementation of
* SecureRandom, a system-provided source of randomness will be used.)
*
* <p>Note that when a Cipher object is initialized, it loses all
* previously-acquired state. In other words, initializing a Cipher is
* equivalent to creating a new instance of that Cipher and initializing
* it.
*
* @param opmode the operation mode of this cipher (this is one of the
* following: <code>ENCRYPT_MODE</code>,
* <code>DECRYPT_MODE</code>, <code>WRAP_MODE</code>
* or <code>UNWRAP_MODE</code>)
* @param key the encryption key
* @param params the algorithm parameters
*
* @exception InvalidKeyException if the given key is inappropriate for
* initializing this cipher, or its keysize exceeds the maximum allowable
* keysize (as determined from the configured jurisdiction policy files).
* @exception InvalidAlgorithmParameterException if the given algorithm
* parameters are inappropriate for this cipher,
* or this cipher requires
* algorithm parameters and <code>params</code> is null, or the given
* algorithm parameters imply a cryptographic strength that would exceed
* the legal limits (as determined from the configured jurisdiction
* policy files).
* @throws UnsupportedOperationException if (@code opmode} is
* {@code WRAP_MODE} or {@code UNWRAP_MODE} but the mode is not implemented
* by the underlying {@code CipherSpi}.
*/
public final void init(int opmode, Key key, AlgorithmParameters params)
throws InvalidKeyException, InvalidAlgorithmParameterException
{
init(opmode, key, params, JceSecurity.RANDOM);
}
/**
* Initializes this cipher with a key, a set of algorithm
* parameters, and a source of randomness.
*
* <p>The cipher is initialized for one of the following four operations:
* encryption, decryption, key wrapping or key unwrapping, depending
* on the value of <code>opmode</code>.
*
* <p>If this cipher requires any algorithm parameters and
* <code>params</code> is null, the underlying cipher implementation is
* supposed to generate the required parameters itself (using
* provider-specific default or random values) if it is being
* initialized for encryption or key wrapping, and raise an
* <code>InvalidAlgorithmParameterException</code> if it is being
* initialized for decryption or key unwrapping.
* The generated parameters can be retrieved using
* {@link #getParameters() getParameters} or
* {@link #getIV() getIV} (if the parameter is an IV).
*
* <p>If this cipher requires algorithm parameters that cannot be
* derived from the input parameters, and there are no reasonable
* provider-specific default values, initialization will
* necessarily fail.
*
* <p>If this cipher (including its underlying feedback or padding scheme)
* requires any random bytes (e.g., for parameter generation), it will get
* them from <code>random</code>.
*
* <p>Note that when a Cipher object is initialized, it loses all
* previously-acquired state. In other words, initializing a Cipher is
* equivalent to creating a new instance of that Cipher and initializing
* it.
*
* @param opmode the operation mode of this cipher (this is one of the
* following: <code>ENCRYPT_MODE</code>,
* <code>DECRYPT_MODE</code>, <code>WRAP_MODE</code>
* or <code>UNWRAP_MODE</code>)
* @param key the encryption key
* @param params the algorithm parameters
* @param random the source of randomness
*
* @exception InvalidKeyException if the given key is inappropriate for
* initializing this cipher, or its keysize exceeds the maximum allowable
* keysize (as determined from the configured jurisdiction policy files).
* @exception InvalidAlgorithmParameterException if the given algorithm
* parameters are inappropriate for this cipher,
* or this cipher requires
* algorithm parameters and <code>params</code> is null, or the given
* algorithm parameters imply a cryptographic strength that would exceed
* the legal limits (as determined from the configured jurisdiction
* policy files).
* @throws UnsupportedOperationException if (@code opmode} is
* {@code WRAP_MODE} or {@code UNWRAP_MODE} but the mode is not implemented
* by the underlying {@code CipherSpi}.
*/
public final void init(int opmode, Key key, AlgorithmParameters params,
SecureRandom random)
throws InvalidKeyException, InvalidAlgorithmParameterException
{
initialized = false;
checkOpmode(opmode);
chooseProvider(InitType.ALGORITHM_PARAMS, opmode, key, null, params, random);
initialized = true;
this.opmode = opmode;
// Android-removed: this debugging mechanism is not used in Android.
/*
if (!skipDebug && pdebug != null) {
pdebug.println("Cipher." + transformation + " " +
getOpmodeString(opmode) + " algorithm from: " +
this.provider.getName());
}
*/
}
/**
* Initializes this cipher with the public key from the given certificate.
* <p> The cipher is initialized for one of the following four operations:
* encryption, decryption, key wrapping or key unwrapping, depending
* on the value of <code>opmode</code>.
*
* <p>If the certificate is of type X.509 and has a <i>key usage</i>
* extension field marked as critical, and the value of the <i>key usage</i>
* extension field implies that the public key in
* the certificate and its corresponding private key are not
* supposed to be used for the operation represented by the value
* of <code>opmode</code>,
* an <code>InvalidKeyException</code>
* is thrown.
*
* <p> If this cipher requires any algorithm parameters that cannot be
* derived from the public key in the given certificate, the underlying
* cipher
* implementation is supposed to generate the required parameters itself
* (using provider-specific default or random values) if it is being
* initialized for encryption or key wrapping, and raise an <code>
* InvalidKeyException</code> if it is being initialized for decryption or
* key unwrapping.
* The generated parameters can be retrieved using
* {@link #getParameters() getParameters} or
* {@link #getIV() getIV} (if the parameter is an IV).
*
* <p>If this cipher requires algorithm parameters that cannot be
* derived from the input parameters, and there are no reasonable
* provider-specific default values, initialization will
* necessarily fail.
*
* <p>If this cipher (including its underlying feedback or padding scheme)
* requires any random bytes (e.g., for parameter generation), it will get
* them using the
* <code>SecureRandom</code>
* implementation of the highest-priority
* installed provider as the source of randomness.
* (If none of the installed providers supply an implementation of
* SecureRandom, a system-provided source of randomness will be used.)
*
* <p>Note that when a Cipher object is initialized, it loses all
* previously-acquired state. In other words, initializing a Cipher is
* equivalent to creating a new instance of that Cipher and initializing
* it.
*
* @param opmode the operation mode of this cipher (this is one of the
* following:
* <code>ENCRYPT_MODE</code>, <code>DECRYPT_MODE</code>,
* <code>WRAP_MODE</code> or <code>UNWRAP_MODE</code>)
* @param certificate the certificate
*
* @exception InvalidKeyException if the public key in the given
* certificate is inappropriate for initializing this cipher, or this
* cipher requires algorithm parameters that cannot be determined from the
* public key in the given certificate, or the keysize of the public key
* in the given certificate has a keysize that exceeds the maximum
* allowable keysize (as determined by the configured jurisdiction policy
* files).
* @throws UnsupportedOperationException if (@code opmode} is
* {@code WRAP_MODE} or {@code UNWRAP_MODE} but the mode is not implemented
* by the underlying {@code CipherSpi}.
*/
public final void init(int opmode, Certificate certificate)
throws InvalidKeyException
{
init(opmode, certificate, JceSecurity.RANDOM);
}
/**
* Initializes this cipher with the public key from the given certificate
* and
* a source of randomness.
*
* <p>The cipher is initialized for one of the following four operations:
* encryption, decryption, key wrapping
* or key unwrapping, depending on
* the value of <code>opmode</code>.
*
* <p>If the certificate is of type X.509 and has a <i>key usage</i>
* extension field marked as critical, and the value of the <i>key usage</i>
* extension field implies that the public key in
* the certificate and its corresponding private key are not
* supposed to be used for the operation represented by the value of
* <code>opmode</code>,
* an <code>InvalidKeyException</code>
* is thrown.
*
* <p>If this cipher requires any algorithm parameters that cannot be
* derived from the public key in the given <code>certificate</code>,
* the underlying cipher
* implementation is supposed to generate the required parameters itself
* (using provider-specific default or random values) if it is being
* initialized for encryption or key wrapping, and raise an
* <code>InvalidKeyException</code> if it is being
* initialized for decryption or key unwrapping.
* The generated parameters can be retrieved using
* {@link #getParameters() getParameters} or
* {@link #getIV() getIV} (if the parameter is an IV).
*
* <p>If this cipher requires algorithm parameters that cannot be
* derived from the input parameters, and there are no reasonable
* provider-specific default values, initialization will
* necessarily fail.
*
* <p>If this cipher (including its underlying feedback or padding scheme)
* requires any random bytes (e.g., for parameter generation), it will get
* them from <code>random</code>.
*
* <p>Note that when a Cipher object is initialized, it loses all
* previously-acquired state. In other words, initializing a Cipher is
* equivalent to creating a new instance of that Cipher and initializing
* it.
*
* @param opmode the operation mode of this cipher (this is one of the
* following:
* <code>ENCRYPT_MODE</code>, <code>DECRYPT_MODE</code>,
* <code>WRAP_MODE</code> or <code>UNWRAP_MODE</code>)
* @param certificate the certificate
* @param random the source of randomness
*
* @exception InvalidKeyException if the public key in the given
* certificate is inappropriate for initializing this cipher, or this
* cipher
* requires algorithm parameters that cannot be determined from the
* public key in the given certificate, or the keysize of the public key
* in the given certificate has a keysize that exceeds the maximum
* allowable keysize (as determined by the configured jurisdiction policy
* files).
* @throws UnsupportedOperationException if (@code opmode} is
* {@code WRAP_MODE} or {@code UNWRAP_MODE} but the mode is not implemented
* by the underlying {@code CipherSpi}.
*/
public final void init(int opmode, Certificate certificate,
SecureRandom random)
throws InvalidKeyException {
initialized = false;
checkOpmode(opmode);
// Check key usage if the certificate is of
// type X.509.
if (certificate instanceof java.security.cert.X509Certificate) {
// Check whether the cert has a key usage extension
// marked as a critical extension.
X509Certificate cert = (X509Certificate) certificate;
Set<String> critSet = cert.getCriticalExtensionOIDs();
if (critSet != null && !critSet.isEmpty()
&& critSet.contains(KEY_USAGE_EXTENSION_OID)) {
boolean[] keyUsageInfo = cert.getKeyUsage();
// keyUsageInfo[2] is for keyEncipherment;
// keyUsageInfo[3] is for dataEncipherment.
if ((keyUsageInfo != null) &&
(((opmode == Cipher.ENCRYPT_MODE) &&
(keyUsageInfo.length > 3) &&
(keyUsageInfo[3] == false)) ||
((opmode == Cipher.WRAP_MODE) &&
(keyUsageInfo.length > 2) &&
(keyUsageInfo[2] == false)))) {
throw new InvalidKeyException("Wrong key usage");
}
}
}
PublicKey publicKey =
(certificate == null ? null : certificate.getPublicKey());
try {
chooseProvider(InitType.KEY, opmode, (Key) publicKey, null, null, random);
} catch (InvalidAlgorithmParameterException e) {
// should never occur
throw new InvalidKeyException(e);
}
initialized = true;
this.opmode = opmode;
// Android-removed: this debugging mechanism is not used in Android.
/*
if (!skipDebug && pdebug != null) {
pdebug.println("Cipher." + transformation + " " +
getOpmodeString(opmode) + " algorithm from: " +
this.provider.getName());
}
*/
}
/**
* Ensures that Cipher is in a valid state for update() and doFinal()
* calls - should be initialized and in ENCRYPT_MODE or DECRYPT_MODE.
* @throws IllegalStateException if Cipher object is not in valid state.
*/
private void checkCipherState() {
if (!(this instanceof NullCipher)) {
if (!initialized) {
throw new IllegalStateException("Cipher not initialized");
}
if ((opmode != Cipher.ENCRYPT_MODE) &&
(opmode != Cipher.DECRYPT_MODE)) {
throw new IllegalStateException("Cipher not initialized " +
"for encryption/decryption");
}
}
}
/**
* Continues a multiple-part encryption or decryption operation
* (depending on how this cipher was initialized), processing another data
* part.
*
* <p>The bytes in the <code>input</code> buffer are processed, and the
* result is stored in a new buffer.
*
* <p>If <code>input</code> has a length of zero, this method returns
* <code>null</code>.
*
* @param input the input buffer
*
* @return the new buffer with the result, or null if the underlying
* cipher is a block cipher and the input data is too short to result in a
* new block.
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized)
*/
public final byte[] update(byte[] input) {
checkCipherState();
// Input sanity check
if (input == null) {
throw new IllegalArgumentException("Null input buffer");
}
updateProviderIfNeeded();
if (input.length == 0) {
return null;
}
return spi.engineUpdate(input, 0, input.length);
}
/**
* Continues a multiple-part encryption or decryption operation
* (depending on how this cipher was initialized), processing another data
* part.
*
* <p>The first <code>inputLen</code> bytes in the <code>input</code>
* buffer, starting at <code>inputOffset</code> inclusive, are processed,
* and the result is stored in a new buffer.
*
* <p>If <code>inputLen</code> is zero, this method returns
* <code>null</code>.
*
* @param input the input buffer
* @param inputOffset the offset in <code>input</code> where the input
* starts
* @param inputLen the input length
*
* @return the new buffer with the result, or null if the underlying
* cipher is a block cipher and the input data is too short to result in a
* new block.
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized)
*/
public final byte[] update(byte[] input, int inputOffset, int inputLen) {
checkCipherState();
// Input sanity check
if (input == null || inputOffset < 0
|| inputLen > (input.length - inputOffset) || inputLen < 0) {
throw new IllegalArgumentException("Bad arguments");
}
updateProviderIfNeeded();
if (inputLen == 0) {
return null;
}
return spi.engineUpdate(input, inputOffset, inputLen);
}
/**
* Continues a multiple-part encryption or decryption operation
* (depending on how this cipher was initialized), processing another data
* part.
*
* <p>The first <code>inputLen</code> bytes in the <code>input</code>
* buffer, starting at <code>inputOffset</code> inclusive, are processed,
* and the result is stored in the <code>output</code> buffer.
*
* <p>If the <code>output</code> buffer is too small to hold the result,
* a <code>ShortBufferException</code> is thrown. In this case, repeat this
* call with a larger output buffer. Use
* {@link #getOutputSize(int) getOutputSize} to determine how big
* the output buffer should be.
*
* <p>If <code>inputLen</code> is zero, this method returns
* a length of zero.
*
* <p>Note: this method should be copy-safe, which means the
* <code>input</code> and <code>output</code> buffers can reference
* the same byte array and no unprocessed input data is overwritten
* when the result is copied into the output buffer.
*
* @param input the input buffer
* @param inputOffset the offset in <code>input</code> where the input
* starts
* @param inputLen the input length
* @param output the buffer for the result
*
* @return the number of bytes stored in <code>output</code>
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized)
* @exception ShortBufferException if the given output buffer is too small
* to hold the result
*/
public final int update(byte[] input, int inputOffset, int inputLen,
byte[] output)
throws ShortBufferException {
checkCipherState();
// Input sanity check
if (input == null || inputOffset < 0
|| inputLen > (input.length - inputOffset) || inputLen < 0) {
throw new IllegalArgumentException("Bad arguments");
}
updateProviderIfNeeded();
if (inputLen == 0) {
return 0;
}
return spi.engineUpdate(input, inputOffset, inputLen,
output, 0);
}
/**
* Continues a multiple-part encryption or decryption operation
* (depending on how this cipher was initialized), processing another data
* part.
*
* <p>The first <code>inputLen</code> bytes in the <code>input</code>
* buffer, starting at <code>inputOffset</code> inclusive, are processed,
* and the result is stored in the <code>output</code> buffer, starting at
* <code>outputOffset</code> inclusive.
*
* <p>If the <code>output</code> buffer is too small to hold the result,
* a <code>ShortBufferException</code> is thrown. In this case, repeat this
* call with a larger output buffer. Use
* {@link #getOutputSize(int) getOutputSize} to determine how big
* the output buffer should be.
*
* <p>If <code>inputLen</code> is zero, this method returns
* a length of zero.
*
* <p>Note: this method should be copy-safe, which means the
* <code>input</code> and <code>output</code> buffers can reference
* the same byte array and no unprocessed input data is overwritten
* when the result is copied into the output buffer.
*
* @param input the input buffer
* @param inputOffset the offset in <code>input</code> where the input
* starts
* @param inputLen the input length
* @param output the buffer for the result
* @param outputOffset the offset in <code>output</code> where the result
* is stored
*
* @return the number of bytes stored in <code>output</code>
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized)
* @exception ShortBufferException if the given output buffer is too small
* to hold the result
*/
public final int update(byte[] input, int inputOffset, int inputLen,
byte[] output, int outputOffset)
throws ShortBufferException {
checkCipherState();
// Input sanity check
if (input == null || inputOffset < 0
|| inputLen > (input.length - inputOffset) || inputLen < 0
|| outputOffset < 0) {
throw new IllegalArgumentException("Bad arguments");
}
updateProviderIfNeeded();
if (inputLen == 0) {
return 0;
}
return spi.engineUpdate(input, inputOffset, inputLen,
output, outputOffset);
}
/**
* Continues a multiple-part encryption or decryption operation
* (depending on how this cipher was initialized), processing another data
* part.
*
* <p>All <code>input.remaining()</code> bytes starting at
* <code>input.position()</code> are processed. The result is stored
* in the output buffer.
* Upon return, the input buffer's position will be equal
* to its limit; its limit will not have changed. The output buffer's
* position will have advanced by n, where n is the value returned
* by this method; the output buffer's limit will not have changed.
*
* <p>If <code>output.remaining()</code> bytes are insufficient to
* hold the result, a <code>ShortBufferException</code> is thrown.
* In this case, repeat this call with a larger output buffer. Use
* {@link #getOutputSize(int) getOutputSize} to determine how big
* the output buffer should be.
*
* <p>Note: this method should be copy-safe, which means the
* <code>input</code> and <code>output</code> buffers can reference
* the same block of memory and no unprocessed input data is overwritten
* when the result is copied into the output buffer.
*
* @param input the input ByteBuffer
* @param output the output ByteByffer
*
* @return the number of bytes stored in <code>output</code>
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized)
* @exception IllegalArgumentException if input and output are the
* same object
* @exception ReadOnlyBufferException if the output buffer is read-only
* @exception ShortBufferException if there is insufficient space in the
* output buffer
* @since 1.5
*/
public final int update(ByteBuffer input, ByteBuffer output)
throws ShortBufferException {
checkCipherState();
if ((input == null) || (output == null)) {
throw new IllegalArgumentException("Buffers must not be null");
}
if (input == output) {
throw new IllegalArgumentException("Input and output buffers must "
+ "not be the same object, consider using buffer.duplicate()");
}
if (output.isReadOnly()) {
throw new ReadOnlyBufferException();
}
updateProviderIfNeeded();
return spi.engineUpdate(input, output);
}
/**
* Finishes a multiple-part encryption or decryption operation, depending
* on how this cipher was initialized.
*
* <p>Input data that may have been buffered during a previous
* <code>update</code> operation is processed, with padding (if requested)
* being applied.
* If an AEAD mode such as GCM/CCM is being used, the authentication
* tag is appended in the case of encryption, or verified in the
* case of decryption.
* The result is stored in a new buffer.
*
* <p>Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to <code>init</code>.
* That is, the object is reset and available to encrypt or decrypt
* (depending on the operation mode that was specified in the call to
* <code>init</code>) more data.
*
* <p>Note: if any exception is thrown, this cipher object may need to
* be reset before it can be used again.
*
* @return the new buffer with the result
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized)
* @exception IllegalBlockSizeException if this cipher is a block cipher,
* no padding has been requested (only in encryption mode), and the total
* input length of the data processed by this cipher is not a multiple of
* block size; or if this encryption algorithm is unable to
* process the input data provided.
* @exception BadPaddingException if this cipher is in decryption mode,
* and (un)padding has been requested, but the decrypted data is not
* bounded by the appropriate padding bytes
* @exception AEADBadTagException if this cipher is decrypting in an
* AEAD mode (such as GCM/CCM), and the received authentication tag
* does not match the calculated value
*/
public final byte[] doFinal()
throws IllegalBlockSizeException, BadPaddingException {
checkCipherState();
updateProviderIfNeeded();
return spi.engineDoFinal(null, 0, 0);
}
/**
* Finishes a multiple-part encryption or decryption operation, depending
* on how this cipher was initialized.
*
* <p>Input data that may have been buffered during a previous
* <code>update</code> operation is processed, with padding (if requested)
* being applied.
* If an AEAD mode such as GCM/CCM is being used, the authentication
* tag is appended in the case of encryption, or verified in the
* case of decryption.
* The result is stored in the <code>output</code> buffer, starting at
* <code>outputOffset</code> inclusive.
*
* <p>If the <code>output</code> buffer is too small to hold the result,
* a <code>ShortBufferException</code> is thrown. In this case, repeat this
* call with a larger output buffer. Use
* {@link #getOutputSize(int) getOutputSize} to determine how big
* the output buffer should be.
*
* <p>Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to <code>init</code>.
* That is, the object is reset and available to encrypt or decrypt
* (depending on the operation mode that was specified in the call to
* <code>init</code>) more data.
*
* <p>Note: if any exception is thrown, this cipher object may need to
* be reset before it can be used again.
*
* @param output the buffer for the result
* @param outputOffset the offset in <code>output</code> where the result
* is stored
*
* @return the number of bytes stored in <code>output</code>
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized)
* @exception IllegalBlockSizeException if this cipher is a block cipher,
* no padding has been requested (only in encryption mode), and the total
* input length of the data processed by this cipher is not a multiple of
* block size; or if this encryption algorithm is unable to
* process the input data provided.
* @exception ShortBufferException if the given output buffer is too small
* to hold the result
* @exception BadPaddingException if this cipher is in decryption mode,
* and (un)padding has been requested, but the decrypted data is not
* bounded by the appropriate padding bytes
* @exception AEADBadTagException if this cipher is decrypting in an
* AEAD mode (such as GCM/CCM), and the received authentication tag
* does not match the calculated value
*/
public final int doFinal(byte[] output, int outputOffset)
throws IllegalBlockSizeException, ShortBufferException,
BadPaddingException {
checkCipherState();
// Input sanity check
if ((output == null) || (outputOffset < 0)) {
throw new IllegalArgumentException("Bad arguments");
}
updateProviderIfNeeded();
return spi.engineDoFinal(null, 0, 0, output, outputOffset);
}
/**
* Encrypts or decrypts data in a single-part operation, or finishes a
* multiple-part operation. The data is encrypted or decrypted,
* depending on how this cipher was initialized.
*
* <p>The bytes in the <code>input</code> buffer, and any input bytes that
* may have been buffered during a previous <code>update</code> operation,
* are processed, with padding (if requested) being applied.
* If an AEAD mode such as GCM/CCM is being used, the authentication
* tag is appended in the case of encryption, or verified in the
* case of decryption.
* The result is stored in a new buffer.
*
* <p>Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to <code>init</code>.
* That is, the object is reset and available to encrypt or decrypt
* (depending on the operation mode that was specified in the call to
* <code>init</code>) more data.
*
* <p>Note: if any exception is thrown, this cipher object may need to
* be reset before it can be used again.
*
* @param input the input buffer
*
* @return the new buffer with the result
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized)
* @exception IllegalBlockSizeException if this cipher is a block cipher,
* no padding has been requested (only in encryption mode), and the total
* input length of the data processed by this cipher is not a multiple of
* block size; or if this encryption algorithm is unable to
* process the input data provided.
* @exception BadPaddingException if this cipher is in decryption mode,
* and (un)padding has been requested, but the decrypted data is not
* bounded by the appropriate padding bytes
* @exception AEADBadTagException if this cipher is decrypting in an
* AEAD mode (such as GCM/CCM), and the received authentication tag
* does not match the calculated value
*/
public final byte[] doFinal(byte[] input)
throws IllegalBlockSizeException, BadPaddingException {
checkCipherState();
// Input sanity check
if (input == null) {
throw new IllegalArgumentException("Null input buffer");
}
updateProviderIfNeeded();
return spi.engineDoFinal(input, 0, input.length);
}
/**
* Encrypts or decrypts data in a single-part operation, or finishes a
* multiple-part operation. The data is encrypted or decrypted,
* depending on how this cipher was initialized.
*
* <p>The first <code>inputLen</code> bytes in the <code>input</code>
* buffer, starting at <code>inputOffset</code> inclusive, and any input
* bytes that may have been buffered during a previous <code>update</code>
* operation, are processed, with padding (if requested) being applied.
* If an AEAD mode such as GCM/CCM is being used, the authentication
* tag is appended in the case of encryption, or verified in the
* case of decryption.
* The result is stored in a new buffer.
*
* <p>Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to <code>init</code>.
* That is, the object is reset and available to encrypt or decrypt
* (depending on the operation mode that was specified in the call to
* <code>init</code>) more data.
*
* <p>Note: if any exception is thrown, this cipher object may need to
* be reset before it can be used again.
*
* @param input the input buffer
* @param inputOffset the offset in <code>input</code> where the input
* starts
* @param inputLen the input length
*
* @return the new buffer with the result
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized)
* @exception IllegalBlockSizeException if this cipher is a block cipher,
* no padding has been requested (only in encryption mode), and the total
* input length of the data processed by this cipher is not a multiple of
* block size; or if this encryption algorithm is unable to
* process the input data provided.
* @exception BadPaddingException if this cipher is in decryption mode,
* and (un)padding has been requested, but the decrypted data is not
* bounded by the appropriate padding bytes
* @exception AEADBadTagException if this cipher is decrypting in an
* AEAD mode (such as GCM/CCM), and the received authentication tag
* does not match the calculated value
*/
public final byte[] doFinal(byte[] input, int inputOffset, int inputLen)
throws IllegalBlockSizeException, BadPaddingException {
checkCipherState();
// Input sanity check
if (input == null || inputOffset < 0
|| inputLen > (input.length - inputOffset) || inputLen < 0) {
throw new IllegalArgumentException("Bad arguments");
}
updateProviderIfNeeded();
return spi.engineDoFinal(input, inputOffset, inputLen);
}
/**
* Encrypts or decrypts data in a single-part operation, or finishes a
* multiple-part operation. The data is encrypted or decrypted,
* depending on how this cipher was initialized.
*
* <p>The first <code>inputLen</code> bytes in the <code>input</code>
* buffer, starting at <code>inputOffset</code> inclusive, and any input
* bytes that may have been buffered during a previous <code>update</code>
* operation, are processed, with padding (if requested) being applied.
* If an AEAD mode such as GCM/CCM is being used, the authentication
* tag is appended in the case of encryption, or verified in the
* case of decryption.
* The result is stored in the <code>output</code> buffer.
*
* <p>If the <code>output</code> buffer is too small to hold the result,
* a <code>ShortBufferException</code> is thrown. In this case, repeat this
* call with a larger output buffer. Use
* {@link #getOutputSize(int) getOutputSize} to determine how big
* the output buffer should be.
*
* <p>Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to <code>init</code>.
* That is, the object is reset and available to encrypt or decrypt
* (depending on the operation mode that was specified in the call to
* <code>init</code>) more data.
*
* <p>Note: if any exception is thrown, this cipher object may need to
* be reset before it can be used again.
*
* <p>Note: this method should be copy-safe, which means the
* <code>input</code> and <code>output</code> buffers can reference
* the same byte array and no unprocessed input data is overwritten
* when the result is copied into the output buffer.
*
* @param input the input buffer
* @param inputOffset the offset in <code>input</code> where the input
* starts
* @param inputLen the input length
* @param output the buffer for the result
*
* @return the number of bytes stored in <code>output</code>
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized)
* @exception IllegalBlockSizeException if this cipher is a block cipher,
* no padding has been requested (only in encryption mode), and the total
* input length of the data processed by this cipher is not a multiple of
* block size; or if this encryption algorithm is unable to
* process the input data provided.
* @exception ShortBufferException if the given output buffer is too small
* to hold the result
* @exception BadPaddingException if this cipher is in decryption mode,
* and (un)padding has been requested, but the decrypted data is not
* bounded by the appropriate padding bytes
* @exception AEADBadTagException if this cipher is decrypting in an
* AEAD mode (such as GCM/CCM), and the received authentication tag
* does not match the calculated value
*/
public final int doFinal(byte[] input, int inputOffset, int inputLen,
byte[] output)
throws ShortBufferException, IllegalBlockSizeException,
BadPaddingException {
checkCipherState();
// Input sanity check
if (input == null || inputOffset < 0
|| inputLen > (input.length - inputOffset) || inputLen < 0) {
throw new IllegalArgumentException("Bad arguments");
}
updateProviderIfNeeded();
return spi.engineDoFinal(input, inputOffset, inputLen,
output, 0);
}
/**
* Encrypts or decrypts data in a single-part operation, or finishes a
* multiple-part operation. The data is encrypted or decrypted,
* depending on how this cipher was initialized.
*
* <p>The first <code>inputLen</code> bytes in the <code>input</code>
* buffer, starting at <code>inputOffset</code> inclusive, and any input
* bytes that may have been buffered during a previous
* <code>update</code> operation, are processed, with padding
* (if requested) being applied.
* If an AEAD mode such as GCM/CCM is being used, the authentication
* tag is appended in the case of encryption, or verified in the
* case of decryption.
* The result is stored in the <code>output</code> buffer, starting at
* <code>outputOffset</code> inclusive.
*
* <p>If the <code>output</code> buffer is too small to hold the result,
* a <code>ShortBufferException</code> is thrown. In this case, repeat this
* call with a larger output buffer. Use
* {@link #getOutputSize(int) getOutputSize} to determine how big
* the output buffer should be.
*
* <p>Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to <code>init</code>.
* That is, the object is reset and available to encrypt or decrypt
* (depending on the operation mode that was specified in the call to
* <code>init</code>) more data.
*
* <p>Note: if any exception is thrown, this cipher object may need to
* be reset before it can be used again.
*
* <p>Note: this method should be copy-safe, which means the
* <code>input</code> and <code>output</code> buffers can reference
* the same byte array and no unprocessed input data is overwritten
* when the result is copied into the output buffer.
*
* @param input the input buffer
* @param inputOffset the offset in <code>input</code> where the input
* starts
* @param inputLen the input length
* @param output the buffer for the result
* @param outputOffset the offset in <code>output</code> where the result
* is stored
*
* @return the number of bytes stored in <code>output</code>
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized)
* @exception IllegalBlockSizeException if this cipher is a block cipher,
* no padding has been requested (only in encryption mode), and the total
* input length of the data processed by this cipher is not a multiple of
* block size; or if this encryption algorithm is unable to
* process the input data provided.
* @exception ShortBufferException if the given output buffer is too small
* to hold the result
* @exception BadPaddingException if this cipher is in decryption mode,
* and (un)padding has been requested, but the decrypted data is not
* bounded by the appropriate padding bytes
* @exception AEADBadTagException if this cipher is decrypting in an
* AEAD mode (such as GCM/CCM), and the received authentication tag
* does not match the calculated value
*/
public final int doFinal(byte[] input, int inputOffset, int inputLen,
byte[] output, int outputOffset)
throws ShortBufferException, IllegalBlockSizeException,
BadPaddingException {
checkCipherState();
// Input sanity check
if (input == null || inputOffset < 0
|| inputLen > (input.length - inputOffset) || inputLen < 0
|| outputOffset < 0) {
throw new IllegalArgumentException("Bad arguments");
}
updateProviderIfNeeded();
return spi.engineDoFinal(input, inputOffset, inputLen,
output, outputOffset);
}
/**
* Encrypts or decrypts data in a single-part operation, or finishes a
* multiple-part operation. The data is encrypted or decrypted,
* depending on how this cipher was initialized.
*
* <p>All <code>input.remaining()</code> bytes starting at
* <code>input.position()</code> are processed.
* If an AEAD mode such as GCM/CCM is being used, the authentication
* tag is appended in the case of encryption, or verified in the
* case of decryption.
* The result is stored in the output buffer.
* Upon return, the input buffer's position will be equal
* to its limit; its limit will not have changed. The output buffer's
* position will have advanced by n, where n is the value returned
* by this method; the output buffer's limit will not have changed.
*
* <p>If <code>output.remaining()</code> bytes are insufficient to
* hold the result, a <code>ShortBufferException</code> is thrown.
* In this case, repeat this call with a larger output buffer. Use
* {@link #getOutputSize(int) getOutputSize} to determine how big
* the output buffer should be.
*
* <p>Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to <code>init</code>.
* That is, the object is reset and available to encrypt or decrypt
* (depending on the operation mode that was specified in the call to
* <code>init</code>) more data.
*
* <p>Note: if any exception is thrown, this cipher object may need to
* be reset before it can be used again.
*
* <p>Note: this method should be copy-safe, which means the
* <code>input</code> and <code>output</code> buffers can reference
* the same byte array and no unprocessed input data is overwritten
* when the result is copied into the output buffer.
*
* @param input the input ByteBuffer
* @param output the output ByteBuffer
*
* @return the number of bytes stored in <code>output</code>
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized)
* @exception IllegalArgumentException if input and output are the
* same object
* @exception ReadOnlyBufferException if the output buffer is read-only
* @exception IllegalBlockSizeException if this cipher is a block cipher,
* no padding has been requested (only in encryption mode), and the total
* input length of the data processed by this cipher is not a multiple of
* block size; or if this encryption algorithm is unable to
* process the input data provided.
* @exception ShortBufferException if there is insufficient space in the
* output buffer
* @exception BadPaddingException if this cipher is in decryption mode,
* and (un)padding has been requested, but the decrypted data is not
* bounded by the appropriate padding bytes
* @exception AEADBadTagException if this cipher is decrypting in an
* AEAD mode (such as GCM/CCM), and the received authentication tag
* does not match the calculated value
*
* @since 1.5
*/
public final int doFinal(ByteBuffer input, ByteBuffer output)
throws ShortBufferException, IllegalBlockSizeException,
BadPaddingException {
checkCipherState();
if ((input == null) || (output == null)) {
throw new IllegalArgumentException("Buffers must not be null");
}
if (input == output) {
throw new IllegalArgumentException("Input and output buffers must "
+ "not be the same object, consider using buffer.duplicate()");
}
if (output.isReadOnly()) {
throw new ReadOnlyBufferException();
}
updateProviderIfNeeded();
return spi.engineDoFinal(input, output);
}
/**
* Wrap a key.
*
* @param key the key to be wrapped.
*
* @return the wrapped key.
*
* @exception IllegalStateException if this cipher is in a wrong
* state (e.g., has not been initialized).
*
* @exception IllegalBlockSizeException if this cipher is a block
* cipher, no padding has been requested, and the length of the
* encoding of the key to be wrapped is not a
* multiple of the block size.
*
* @exception InvalidKeyException if it is impossible or unsafe to
* wrap the key with this cipher (e.g., a hardware protected key is
* being passed to a software-only cipher).
*
* @throws UnsupportedOperationException if the corresponding method in the
* {@code CipherSpi} is not supported.
*/
public final byte[] wrap(Key key)
throws IllegalBlockSizeException, InvalidKeyException {
if (!(this instanceof NullCipher)) {
if (!initialized) {
throw new IllegalStateException("Cipher not initialized");
}
if (opmode != Cipher.WRAP_MODE) {
throw new IllegalStateException("Cipher not initialized " +
"for wrapping keys");
}
}
updateProviderIfNeeded();
return spi.engineWrap(key);
}
/**
* Unwrap a previously wrapped key.
*
* @param wrappedKey the key to be unwrapped.
*
* @param wrappedKeyAlgorithm the algorithm associated with the wrapped
* key.
*
* @param wrappedKeyType the type of the wrapped key. This must be one of
* <code>SECRET_KEY</code>, <code>PRIVATE_KEY</code>, or
* <code>PUBLIC_KEY</code>.
*
* @return the unwrapped key.
*
* @exception IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized).
*
* @exception NoSuchAlgorithmException if no installed providers
* can create keys of type <code>wrappedKeyType</code> for the
* <code>wrappedKeyAlgorithm</code>.
*
* @exception InvalidKeyException if <code>wrappedKey</code> does not
* represent a wrapped key of type <code>wrappedKeyType</code> for
* the <code>wrappedKeyAlgorithm</code>.
*
* @throws UnsupportedOperationException if the corresponding method in the
* {@code CipherSpi} is not supported.
*/
public final Key unwrap(byte[] wrappedKey,
String wrappedKeyAlgorithm,
int wrappedKeyType)
throws InvalidKeyException, NoSuchAlgorithmException {
if (!(this instanceof NullCipher)) {
if (!initialized) {
throw new IllegalStateException("Cipher not initialized");
}
if (opmode != Cipher.UNWRAP_MODE) {
throw new IllegalStateException("Cipher not initialized " +
"for unwrapping keys");
}
}
if ((wrappedKeyType != SECRET_KEY) &&
(wrappedKeyType != PRIVATE_KEY) &&
(wrappedKeyType != PUBLIC_KEY)) {
throw new InvalidParameterException("Invalid key type");
}
updateProviderIfNeeded();
return spi.engineUnwrap(wrappedKey,
wrappedKeyAlgorithm,
wrappedKeyType);
}
private AlgorithmParameterSpec getAlgorithmParameterSpec(
AlgorithmParameters params)
throws InvalidParameterSpecException {
if (params == null) {
return null;
}
String alg = params.getAlgorithm().toUpperCase(Locale.ENGLISH);
if (alg.equalsIgnoreCase("RC2")) {
return params.getParameterSpec(RC2ParameterSpec.class);
}
if (alg.equalsIgnoreCase("RC5")) {
return params.getParameterSpec(RC5ParameterSpec.class);
}
if (alg.startsWith("PBE")) {
return params.getParameterSpec(PBEParameterSpec.class);
}
if (alg.startsWith("DES")) {
return params.getParameterSpec(IvParameterSpec.class);
}
return null;
}
/**
* Returns the maximum key length for the specified transformation
* according to the installed JCE jurisdiction policy files. If
* JCE unlimited strength jurisdiction policy files are installed,
* Integer.MAX_VALUE will be returned.
* For more information on default key size in JCE jurisdiction
* policy files, please see Appendix E in the
* <a href=
* "{@docRoot}openjdk-redirect.html?v=8&path=/technotes/guides/security/crypto/CryptoSpec.html#AppC">
* Java Cryptography Architecture Reference Guide</a>.
*
* @param transformation the cipher transformation.
* @return the maximum key length in bits or Integer.MAX_VALUE.
* @exception NullPointerException if <code>transformation</code> is null.
* @exception NoSuchAlgorithmException if <code>transformation</code>
* is not a valid transformation, i.e. in the form of "algorithm" or
* "algorithm/mode/padding".
* @since 1.5
*/
public static final int getMaxAllowedKeyLength(String transformation)
throws NoSuchAlgorithmException {
// Android-changed: Remove references to CryptoPermission.
// Throw early if transformation == null or isn't valid.
//
// CryptoPermission cp = getConfiguredPermission(transformation);
// return cp.getMaxAllowedKeyLength();
if (transformation == null) {
throw new NullPointerException("transformation == null");
}
// Throws NoSuchAlgorithmException if necessary.
tokenizeTransformation(transformation);
return Integer.MAX_VALUE;
}
/**
* Returns an AlgorithmParameterSpec object which contains
* the maximum cipher parameter value according to the
* jurisdiction policy file. If JCE unlimited strength jurisdiction
* policy files are installed or there is no maximum limit on the
* parameters for the specified transformation in the policy file,
* null will be returned.
*
* @param transformation the cipher transformation.
* @return an AlgorithmParameterSpec which holds the maximum
* value or null.
* @exception NullPointerException if <code>transformation</code>
* is null.
* @exception NoSuchAlgorithmException if <code>transformation</code>
* is not a valid transformation, i.e. in the form of "algorithm" or
* "algorithm/mode/padding".
* @since 1.5
*/
public static final AlgorithmParameterSpec getMaxAllowedParameterSpec(
String transformation) throws NoSuchAlgorithmException {
// Android-changed: Remove references to CryptoPermission.
// Throw early if transformation == null or isn't valid.
//
// CryptoPermission cp = getConfiguredPermission(transformation);
// return cp.getAlgorithmParameterSpec();
if (transformation == null) {
throw new NullPointerException("transformation == null");
}
// Throws NoSuchAlgorithmException if necessary.
tokenizeTransformation(transformation);
return null;
}
/**
* Continues a multi-part update of the Additional Authentication
* Data (AAD).
* <p>
* Calls to this method provide AAD to the cipher when operating in
* modes such as AEAD (GCM/CCM). If this cipher is operating in
* either GCM or CCM mode, all AAD must be supplied before beginning
* operations on the ciphertext (via the {@code update} and {@code
* doFinal} methods).
*
* @param src the buffer containing the Additional Authentication Data
*
* @throws IllegalArgumentException if the {@code src}
* byte array is null
* @throws IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized), does not accept AAD, or if
* operating in either GCM or CCM mode and one of the {@code update}
* methods has already been called for the active
* encryption/decryption operation
* @throws UnsupportedOperationException if the corresponding method
* in the {@code CipherSpi} has not been overridden by an
* implementation
*
* @since 1.7
*/
public final void updateAAD(byte[] src) {
if (src == null) {
throw new IllegalArgumentException("src buffer is null");
}
updateAAD(src, 0, src.length);
}
/**
* Continues a multi-part update of the Additional Authentication
* Data (AAD), using a subset of the provided buffer.
* <p>
* Calls to this method provide AAD to the cipher when operating in
* modes such as AEAD (GCM/CCM). If this cipher is operating in
* either GCM or CCM mode, all AAD must be supplied before beginning
* operations on the ciphertext (via the {@code update} and {@code
* doFinal} methods).
*
* @param src the buffer containing the AAD
* @param offset the offset in {@code src} where the AAD input starts
* @param len the number of AAD bytes
*
* @throws IllegalArgumentException if the {@code src}
* byte array is null, or the {@code offset} or {@code length}
* is less than 0, or the sum of the {@code offset} and
* {@code len} is greater than the length of the
* {@code src} byte array
* @throws IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized), does not accept AAD, or if
* operating in either GCM or CCM mode and one of the {@code update}
* methods has already been called for the active
* encryption/decryption operation
* @throws UnsupportedOperationException if the corresponding method
* in the {@code CipherSpi} has not been overridden by an
* implementation
*
* @since 1.7
*/
public final void updateAAD(byte[] src, int offset, int len) {
checkCipherState();
// Input sanity check
if ((src == null) || (offset < 0) || (len < 0)
|| ((len + offset) > src.length)) {
throw new IllegalArgumentException("Bad arguments");
}
updateProviderIfNeeded();
if (len == 0) {
return;
}
spi.engineUpdateAAD(src, offset, len);
}
/**
* Continues a multi-part update of the Additional Authentication
* Data (AAD).
* <p>
* Calls to this method provide AAD to the cipher when operating in
* modes such as AEAD (GCM/CCM). If this cipher is operating in
* either GCM or CCM mode, all AAD must be supplied before beginning
* operations on the ciphertext (via the {@code update} and {@code
* doFinal} methods).
* <p>
* All {@code src.remaining()} bytes starting at
* {@code src.position()} are processed.
* Upon return, the input buffer's position will be equal
* to its limit; its limit will not have changed.
*
* @param src the buffer containing the AAD
*
* @throws IllegalArgumentException if the {@code src ByteBuffer}
* is null
* @throws IllegalStateException if this cipher is in a wrong state
* (e.g., has not been initialized), does not accept AAD, or if
* operating in either GCM or CCM mode and one of the {@code update}
* methods has already been called for the active
* encryption/decryption operation
* @throws UnsupportedOperationException if the corresponding method
* in the {@code CipherSpi} has not been overridden by an
* implementation
*
* @since 1.7
*/
public final void updateAAD(ByteBuffer src) {
checkCipherState();
// Input sanity check
if (src == null) {
throw new IllegalArgumentException("src ByteBuffer is null");
}
updateProviderIfNeeded();
if (src.remaining() == 0) {
return;
}
spi.engineUpdateAAD(src);
}
/**
* Returns the {@code CipherSpi} backing this {@code Cipher} or {@code null} if no
* {@code CipherSpi} is backing this {@code Cipher}.
*
* @hide
*/
public CipherSpi getCurrentSpi() {
return spi;
}
/** The attribute used for supported paddings. */
private static final String ATTRIBUTE_PADDINGS = "SupportedPaddings";
/** The attribute used for supported modes. */
private static final String ATTRIBUTE_MODES = "SupportedModes";
/**
* If the attribute listed exists, check that it matches the regular
* expression.
*/
static boolean matchAttribute(Provider.Service service, String attr, String value) {
if (value == null) {
return true;
}
final String pattern = service.getAttribute(attr);
if (pattern == null) {
return true;
}
final String valueUc = value.toUpperCase(Locale.US);
return valueUc.matches(pattern.toUpperCase(Locale.US));
}
/** Items that need to be set on the Cipher instance. */
enum NeedToSet {
NONE, MODE, PADDING, BOTH,
}
/**
* Expresses the various types of transforms that may be used during
* initialization.
*/
static class Transform {
private final String name;
private final NeedToSet needToSet;
public Transform(String name, NeedToSet needToSet) {
this.name = name;
this.needToSet = needToSet;
}
}
/**
* Keeps track of the possible arguments to {@code Cipher#init(...)}.
*/
static class InitParams {
final InitType initType;
final int opmode;
final Key key;
final SecureRandom random;
final AlgorithmParameterSpec spec;
final AlgorithmParameters params;
InitParams(InitType initType, int opmode, Key key, SecureRandom random,
AlgorithmParameterSpec spec, AlgorithmParameters params) {
this.initType = initType;
this.opmode = opmode;
this.key = key;
this.random = random;
this.spec = spec;
this.params = params;
}
}
/**
* Used to keep track of which underlying {@code CipherSpi#engineInit(...)}
* variant to call when testing suitability.
*/
static enum InitType {
KEY, ALGORITHM_PARAMS, ALGORITHM_PARAM_SPEC,
}
class SpiAndProviderUpdater {
/**
* Lock held while the SPI is initializing.
*/
private final Object initSpiLock = new Object();
/**
* The provider specified when instance created.
*/
private final Provider specifiedProvider;
/**
* The SPI implementation.
*/
private final CipherSpi specifiedSpi;
SpiAndProviderUpdater(Provider specifiedProvider, CipherSpi specifiedSpi) {
this.specifiedProvider = specifiedProvider;
this.specifiedSpi = specifiedSpi;
}
void setCipherSpiImplAndProvider(CipherSpi cipherSpi, Provider provider) {
Cipher.this.spi = cipherSpi;
Cipher.this.provider = provider;
}
/**
* Makes sure a CipherSpi that matches this type is selected. If
* {@code key != null} then it assumes that a suitable provider exists for
* this instance (used by {@link Cipher#init}. If the {@code initParams} is passed
* in, then the {@code CipherSpi} returned will be initialized.
*
* @throws InvalidKeyException if the specified key cannot be used to
* initialize this cipher.
*/
CipherSpiAndProvider updateAndGetSpiAndProvider(
InitParams initParams,
CipherSpi spiImpl,
Provider provider)
throws InvalidKeyException, InvalidAlgorithmParameterException {
if (specifiedSpi != null) {
return new CipherSpiAndProvider(specifiedSpi, provider);
}
synchronized (initSpiLock) {
// This is not only a matter of performance. Many methods like update, doFinal, etc.
// call {@code #getSpi()} (ie, {@code #getSpi(null /* params */)}) and without this
// shortcut they would override an spi that was chosen using the key.
if (spiImpl != null && initParams == null) {
return new CipherSpiAndProvider(spiImpl, provider);
}
final CipherSpiAndProvider sap = tryCombinations(
initParams, specifiedProvider, tokenizedTransformation);
if (sap == null) {
throw new ProviderException("No provider found for "
+ Arrays.toString(tokenizedTransformation));
}
setCipherSpiImplAndProvider(sap.cipherSpi, sap.provider);
return new CipherSpiAndProvider(sap.cipherSpi, sap.provider);
}
}
/**
* Convenience call when the Key is not available.
*/
CipherSpiAndProvider updateAndGetSpiAndProvider(CipherSpi spiImpl, Provider provider) {
try {
return updateAndGetSpiAndProvider(null, spiImpl, provider);
} catch (InvalidKeyException | InvalidAlgorithmParameterException e) {
throw new ProviderException("Exception thrown when params == null", e);
}
}
CipherSpi getCurrentSpi(CipherSpi spiImpl) {
if (specifiedSpi != null) {
return specifiedSpi;
}
synchronized (initSpiLock) {
return spiImpl;
}
}
}
/**
* Tries to find the correct {@code Cipher} transform to use. Returns a
* {@link org.apache.harmony.security.fortress.Engine.SpiAndProvider}, throws the first exception that was
* encountered during attempted initialization, or {@code null} if there are
* no providers that support the {@code initParams}.
* <p>
* {@code tokenizedTransformation} must be in the format returned by
* {@link Cipher#checkTransformation(String)}. The combinations of mode strings
* tried are as follows:
* <ul>
* <li><code>[cipher]/[mode]/[padding]</code>
* <li><code>[cipher]/[mode]</code>
* <li><code>[cipher]//[padding]</code>
* <li><code>[cipher]</code>
* </ul>
* {@code services} is a list of cipher services. Needs to be non-null only if
* {@code provider != null}
*/
static CipherSpiAndProvider tryCombinations(InitParams initParams, Provider provider,
String[] tokenizedTransformation)
throws InvalidKeyException,
InvalidAlgorithmParameterException {
// Enumerate all the transforms we need to try
ArrayList<Transform> transforms = new ArrayList<Transform>();
if (tokenizedTransformation[1] != null && tokenizedTransformation[2] != null) {
transforms.add(new Transform(tokenizedTransformation[0] + "/" + tokenizedTransformation[1] + "/"
+ tokenizedTransformation[2], NeedToSet.NONE));
}
if (tokenizedTransformation[1] != null) {
transforms.add(new Transform(tokenizedTransformation[0] + "/" + tokenizedTransformation[1],
NeedToSet.PADDING));
}
if (tokenizedTransformation[2] != null) {
transforms.add(new Transform(tokenizedTransformation[0] + "//" + tokenizedTransformation[2],
NeedToSet.MODE));
}
transforms.add(new Transform(tokenizedTransformation[0], NeedToSet.BOTH));
// Try each of the transforms and keep track of the first exception
// encountered.
Exception cause = null;
if (provider != null) {
for (Transform transform : transforms) {
Provider.Service service = provider.getService("Cipher", transform.name);
if (service == null) {
continue;
}
return tryTransformWithProvider(initParams, tokenizedTransformation, transform.needToSet,
service);
}
} else {
for (Provider prov : Security.getProviders()) {
for (Transform transform : transforms) {
Provider.Service service = prov.getService("Cipher", transform.name);
if (service == null) {
continue;
}
if (initParams == null || initParams.key == null
|| service.supportsParameter(initParams.key)) {
try {
CipherSpiAndProvider sap = tryTransformWithProvider(initParams,
tokenizedTransformation, transform.needToSet, service);
if (sap != null) {
return sap;
}
} catch (Exception e) {
if (cause == null) {
cause = e;
}
}
}
}
}
}
if (cause instanceof InvalidKeyException) {
throw (InvalidKeyException) cause;
} else if (cause instanceof InvalidAlgorithmParameterException) {
throw (InvalidAlgorithmParameterException) cause;
} else if (cause instanceof RuntimeException) {
throw (RuntimeException) cause;
} else if (cause != null) {
throw new InvalidKeyException("No provider can be initialized with given key", cause);
} else if (initParams == null || initParams.key == null) {
return null;
} else {
// Since the key is not null, a suitable provider exists,
// and it is an InvalidKeyException.
throw new InvalidKeyException(
"No provider offers " + Arrays.toString(tokenizedTransformation) + " for "
+ initParams.key.getAlgorithm() + " key of class "
+ initParams.key.getClass().getName() + " and export format "
+ initParams.key.getFormat());
}
}
static class CipherSpiAndProvider {
CipherSpi cipherSpi;
Provider provider;
CipherSpiAndProvider(CipherSpi cipherSpi, Provider provider) {
this.cipherSpi = cipherSpi;
this.provider = provider;
}
}
/**
* Tries to initialize the {@code Cipher} from a given {@code service}. If
* initialization is successful, the initialized {@code spi} is returned. If
* the {@code service} cannot be initialized with the specified
* {@code initParams}, then it's expected to throw
* {@code InvalidKeyException} or {@code InvalidAlgorithmParameterException}
* as a hint to the caller that it should continue searching for a
* {@code Service} that will work.
*/
static CipherSpiAndProvider tryTransformWithProvider(InitParams initParams,
String[] tokenizedTransformation, NeedToSet type, Provider.Service service)
throws InvalidKeyException, InvalidAlgorithmParameterException {
try {
/*
* Check to see if the Cipher even supports the attributes before
* trying to instantiate it.
*/
if (!matchAttribute(service, ATTRIBUTE_MODES, tokenizedTransformation[1])
|| !matchAttribute(service, ATTRIBUTE_PADDINGS, tokenizedTransformation[2])) {
return null;
}
CipherSpiAndProvider sap = new CipherSpiAndProvider(
(CipherSpi) service.newInstance(null), service.getProvider());
if (sap.cipherSpi == null || sap.provider == null) {
return null;
}
CipherSpi spi = sap.cipherSpi;
if (((type == NeedToSet.MODE) || (type == NeedToSet.BOTH))
&& (tokenizedTransformation[1] != null)) {
spi.engineSetMode(tokenizedTransformation[1]);
}
if (((type == NeedToSet.PADDING) || (type == NeedToSet.BOTH))
&& (tokenizedTransformation[2] != null)) {
spi.engineSetPadding(tokenizedTransformation[2]);
}
if (initParams != null) {
switch (initParams.initType) {
case ALGORITHM_PARAMS:
spi.engineInit(initParams.opmode, initParams.key, initParams.params,
initParams.random);
break;
case ALGORITHM_PARAM_SPEC:
spi.engineInit(initParams.opmode, initParams.key, initParams.spec,
initParams.random);
break;
case KEY:
spi.engineInit(initParams.opmode, initParams.key, initParams.random);
break;
default:
throw new AssertionError("This should never be reached");
}
}
return new CipherSpiAndProvider(spi, sap.provider);
} catch (NoSuchAlgorithmException ignored) {
} catch (NoSuchPaddingException ignored) {
}
return null;
}
}