/* * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.crypto; import java.util.*; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ConcurrentMap; import java.util.regex.*; 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.util.Debug; import sun.security.jca.*; /** * This class provides the functionality of a cryptographic cipher for * encryption and decryption. It forms the core of the Java Cryptographic * Extension (JCE) framework. * *
In order to create a Cipher object, the application calls the * Cipher's {@code getInstance} method, and passes the name of the * requested transformation to it. Optionally, the name of a provider * may be specified. * *
A transformation 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., DES), and may be followed by a feedback mode and * padding scheme. * *
A transformation is of the form: * *
(in the latter case, * provider-specific default values for the mode and padding scheme are used). * For example, the following is a valid transformation: * *
* Cipher c = Cipher.getInstance("DES/CBC/PKCS5Padding"); ** * Using modes such as {@code CFB} and {@code OFB}, 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}" and * "{@code DES/OFB32/PKCS5Padding}" 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. *
* 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 * RFC 5116 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. *
* 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) before the ciphertext is processed (via * the {@code update} and {@code doFinal} methods). *
* 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. *
* 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); * ... * ** Every implementation of the Java platform is required to support * the following standard {@code Cipher} transformations with the keysizes * in parentheses: *
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. * *
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.,
* DES/CBC/PKCS5Padding.
* See the Cipher section in the
* Java Cryptography Architecture Standard Algorithm Name Documentation
* for information about standard transformation names.
*
* @return a cipher that implements the requested transformation.
*
* @exception NoSuchAlgorithmException if {@code transformation}
* is null, empty, in an invalid format,
* or if no Provider supports a CipherSpi implementation for the
* specified algorithm.
*
* @exception NoSuchPaddingException if {@code transformation}
* contains a padding scheme that is not available.
*
* @see java.security.Provider
*/
public static final Cipher getInstance(String transformation)
throws NoSuchAlgorithmException, NoSuchPaddingException
{
List 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.
*
* 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., DES/CBC/PKCS5Padding.
* See the Cipher section in the
* Java Cryptography Architecture Standard Algorithm Name Documentation
* 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}
* 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}
* contains a padding scheme that is not available.
*
* @exception IllegalArgumentException if the {@code provider}
* 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 getInstance(transformation, p);
}
/**
* Returns a {@code Cipher} object that implements the specified
* transformation.
*
* 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., DES/CBC/PKCS5Padding.
* See the Cipher section in the
* Java Cryptography Architecture Standard Algorithm Name Documentation
* for information about standard transformation names.
*
* @param provider the provider.
*
* @return a cipher that implements the requested transformation.
*
* @exception NoSuchAlgorithmException if {@code transformation}
* 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}
* contains a padding scheme that is not available.
*
* @exception IllegalArgumentException if the {@code provider}
* 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");
}
Exception failure = null;
List This is the same name that was specified in one of the
* {@code getInstance} calls that created this {@code Cipher}
* object..
*
* @return the algorithm name of this {@code Cipher} 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() {
chooseFirstProvider();
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} or
* {@code doFinal} operation, given the input length
* {@code inputLen} (in bytes).
*
* This call takes into account any unprocessed (buffered) data from a
* previous {@code update} call, padding, and AEAD tagging.
*
* The actual output length of the next {@code update} or
* {@code doFinal} 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");
}
chooseFirstProvider();
return spi.engineGetOutputSize(inputLen);
}
/**
* Returns the initialization vector (IV) in a new buffer.
*
* 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() {
chooseFirstProvider();
return spi.engineGetIV();
}
/**
* Returns the parameters used with this cipher.
*
* 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() {
chooseFirstProvider();
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() {
chooseFirstProvider();
return exmech;
}
//
// Crypto permission check code below
//
private void checkCryptoPerm(CipherSpi checkSpi, Key key)
throws InvalidKeyException {
if (cryptoPerm == CryptoAllPermission.INSTANCE) {
return;
}
// Check if key size and default parameters are within legal limits
AlgorithmParameterSpec params;
try {
params = getAlgorithmParameterSpec(checkSpi.engineGetParameters());
} catch (InvalidParameterSpecException ipse) {
throw new InvalidKeyException
("Unsupported default algorithm parameters");
}
if (!passCryptoPermCheck(checkSpi, key, params)) {
throw new InvalidKeyException(
"Illegal key size or default parameters");
}
}
private void checkCryptoPerm(CipherSpi checkSpi, Key key,
AlgorithmParameterSpec params) throws InvalidKeyException,
InvalidAlgorithmParameterException {
if (cryptoPerm == CryptoAllPermission.INSTANCE) {
return;
}
// Determine keysize and check if it is within legal limits
if (!passCryptoPermCheck(checkSpi, key, null)) {
throw new InvalidKeyException("Illegal key size");
}
if ((params != null) && (!passCryptoPermCheck(checkSpi, key, params))) {
throw new InvalidAlgorithmParameterException("Illegal parameters");
}
}
private void checkCryptoPerm(CipherSpi checkSpi, Key key,
AlgorithmParameters params)
throws InvalidKeyException, InvalidAlgorithmParameterException {
if (cryptoPerm == CryptoAllPermission.INSTANCE) {
return;
}
// Convert the specified parameters into specs and then delegate.
AlgorithmParameterSpec pSpec;
try {
pSpec = getAlgorithmParameterSpec(params);
} catch (InvalidParameterSpecException ipse) {
throw new InvalidAlgorithmParameterException
("Failed to retrieve algorithm parameter specification");
}
checkCryptoPerm(checkSpi, key, pSpec);
}
private boolean passCryptoPermCheck(CipherSpi checkSpi, Key key,
AlgorithmParameterSpec params)
throws InvalidKeyException {
String em = cryptoPerm.getExemptionMechanism();
int keySize = checkSpi.engineGetKeySize(key);
// Use the "algorithm" component of the cipher
// transformation so that the perm check would
// work when the key has the "aliased" algo.
String algComponent;
int index = transformation.indexOf('/');
if (index != -1) {
algComponent = transformation.substring(0, index);
} else {
algComponent = transformation;
}
CryptoPermission checkPerm =
new CryptoPermission(algComponent, keySize, params, em);
if (!cryptoPerm.implies(checkPerm)) {
if (debug != null) {
debug.println("Crypto Permission check failed");
debug.println("granted: " + cryptoPerm);
debug.println("requesting: " + checkPerm);
}
return false;
}
if (exmech == null) {
return true;
}
try {
if (!exmech.isCryptoAllowed(key)) {
if (debug != null) {
debug.println(exmech.getName() + " isn't enforced");
}
return false;
}
} catch (ExemptionMechanismException eme) {
if (debug != null) {
debug.println("Cannot determine whether "+
exmech.getName() + " has been enforced");
eme.printStackTrace();
}
return false;
}
return true;
}
// 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.
*
* 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}.
*
* If this cipher requires any algorithm parameters that cannot be
* derived from the given {@code key}, 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} 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).
*
* 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.
*
* 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.)
*
* 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 DECRYPT_MODE},
* {@code WRAP_MODE} or {@code UNWRAP_MODE})
* @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.
*
* 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}.
*
* If this cipher requires any algorithm parameters that cannot be
* derived from the given {@code key}, 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} 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).
*
* 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.
*
* 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}.
*
* 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 DECRYPT_MODE},
* {@code WRAP_MODE} or {@code UNWRAP_MODE})
* @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);
if (spi != null) {
checkCryptoPerm(spi, key);
spi.engineInit(opmode, key, random);
} else {
try {
chooseProvider(I_KEY, opmode, key, null, null, random);
} catch (InvalidAlgorithmParameterException e) {
// should never occur
throw new InvalidKeyException(e);
}
}
initialized = true;
this.opmode = opmode;
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.
*
* 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}.
*
* If this cipher requires any algorithm parameters and
* {@code params} 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} 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).
*
* 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.
*
* 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.)
*
* 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 DECRYPT_MODE},
* {@code WRAP_MODE} or {@code UNWRAP_MODE})
* @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} 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.
*
* 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}.
*
* If this cipher requires any algorithm parameters and
* {@code params} 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} 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).
*
* 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.
*
* 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}.
*
* 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 DECRYPT_MODE},
* {@code WRAP_MODE} or {@code UNWRAP_MODE})
* @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} 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);
if (spi != null) {
checkCryptoPerm(spi, key, params);
spi.engineInit(opmode, key, params, random);
} else {
chooseProvider(I_PARAMSPEC, opmode, key, params, null, random);
}
initialized = true;
this.opmode = opmode;
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.
*
* 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}.
*
* If this cipher requires any algorithm parameters and
* {@code params} 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} 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).
*
* 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.
*
* 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.)
*
* 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 DECRYPT_MODE}, {@code WRAP_MODE}
* or {@code UNWRAP_MODE})
* @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} 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.
*
* 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}.
*
* If this cipher requires any algorithm parameters and
* {@code params} 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} 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).
*
* 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.
*
* 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}.
*
* 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 DECRYPT_MODE}, {@code WRAP_MODE}
* or {@code UNWRAP_MODE})
* @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} 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);
if (spi != null) {
checkCryptoPerm(spi, key, params);
spi.engineInit(opmode, key, params, random);
} else {
chooseProvider(I_PARAMS, opmode, key, null, params, random);
}
initialized = true;
this.opmode = opmode;
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.
* 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}.
*
* If the certificate is of type X.509 and has a key usage
* extension field marked as critical, and the value of the key usage
* 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},
* an {@code InvalidKeyException}
* is thrown.
*
* 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} 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).
*
* 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.
*
* 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}
* 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.)
*
* 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 DECRYPT_MODE},
* {@code WRAP_MODE} or {@code UNWRAP_MODE})
* @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.
*
* 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}.
*
* If the certificate is of type X.509 and has a key usage
* extension field marked as critical, and the value of the key usage
* 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},
* an {@code InvalidKeyException}
* is thrown.
*
* If this cipher requires any algorithm parameters that cannot be
* derived from the public key in the given {@code 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} 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).
*
* 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.
*
* 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}.
*
* 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 DECRYPT_MODE},
* {@code WRAP_MODE} or {@code UNWRAP_MODE})
* @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 The bytes in the {@code input} buffer are processed, and the
* result is stored in a new buffer.
*
* If {@code input} has a length of zero, this method returns
* {@code null}.
*
* @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");
}
chooseFirstProvider();
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.
*
* The first {@code inputLen} bytes in the {@code input}
* buffer, starting at {@code inputOffset} inclusive, are processed,
* and the result is stored in a new buffer.
*
* If {@code inputLen} is zero, this method returns
* {@code null}.
*
* @param input the input buffer
* @param inputOffset the offset in {@code input} 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");
}
chooseFirstProvider();
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.
*
* The first {@code inputLen} bytes in the {@code input}
* buffer, starting at {@code inputOffset} inclusive, are processed,
* and the result is stored in the {@code output} buffer.
*
* If the {@code output} buffer is too small to hold the result,
* a {@code ShortBufferException} 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.
*
* If {@code inputLen} is zero, this method returns
* a length of zero.
*
* Note: this method should be copy-safe, which means the
* {@code input} and {@code output} 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} 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}
*
* @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");
}
chooseFirstProvider();
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.
*
* The first {@code inputLen} bytes in the {@code input}
* buffer, starting at {@code inputOffset} inclusive, are processed,
* and the result is stored in the {@code output} buffer, starting at
* {@code outputOffset} inclusive.
*
* If the {@code output} buffer is too small to hold the result,
* a {@code ShortBufferException} 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.
*
* If {@code inputLen} is zero, this method returns
* a length of zero.
*
* Note: this method should be copy-safe, which means the
* {@code input} and {@code output} 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} where the input
* starts
* @param inputLen the input length
* @param output the buffer for the result
* @param outputOffset the offset in {@code output} where the result
* is stored
*
* @return the number of bytes stored in {@code output}
*
* @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");
}
chooseFirstProvider();
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.
*
* All {@code input.remaining()} bytes starting at
* {@code input.position()} 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.
*
* If {@code output.remaining()} bytes are insufficient to
* hold the result, a {@code ShortBufferException} 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.
*
* Note: this method should be copy-safe, which means the
* {@code input} and {@code output} 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}
*
* @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();
}
chooseFirstProvider();
return spi.engineUpdate(input, output);
}
/**
* Finishes a multiple-part encryption or decryption operation, depending
* on how this cipher was initialized.
*
* Input data that may have been buffered during a previous
* {@code update} 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.
*
* Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to {@code init}.
* 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}) more data.
*
* 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();
chooseFirstProvider();
return spi.engineDoFinal(null, 0, 0);
}
/**
* Finishes a multiple-part encryption or decryption operation, depending
* on how this cipher was initialized.
*
* Input data that may have been buffered during a previous
* {@code update} 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} buffer, starting at
* {@code outputOffset} inclusive.
*
* If the {@code output} buffer is too small to hold the result,
* a {@code ShortBufferException} 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.
*
* Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to {@code init}.
* 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}) more data.
*
* 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} where the result
* is stored
*
* @return the number of bytes stored in {@code output}
*
* @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");
}
chooseFirstProvider();
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.
*
* The bytes in the {@code input} buffer, and any input bytes that
* may have been buffered during a previous {@code update} 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.
*
* Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to {@code init}.
* 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}) more data.
*
* 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");
}
chooseFirstProvider();
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.
*
* The first {@code inputLen} bytes in the {@code input}
* buffer, starting at {@code inputOffset} inclusive, and any input
* bytes that may have been buffered during a previous {@code update}
* 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.
*
* Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to {@code init}.
* 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}) more data.
*
* 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} 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");
}
chooseFirstProvider();
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.
*
* The first {@code inputLen} bytes in the {@code input}
* buffer, starting at {@code inputOffset} inclusive, and any input
* bytes that may have been buffered during a previous {@code update}
* 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} buffer.
*
* If the {@code output} buffer is too small to hold the result,
* a {@code ShortBufferException} 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.
*
* Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to {@code init}.
* 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}) more data.
*
* Note: if any exception is thrown, this cipher object may need to
* be reset before it can be used again.
*
* Note: this method should be copy-safe, which means the
* {@code input} and {@code output} 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} 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}
*
* @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");
}
chooseFirstProvider();
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.
*
* The first {@code inputLen} bytes in the {@code input}
* buffer, starting at {@code inputOffset} inclusive, and any input
* bytes that may have been buffered during a previous
* {@code update} 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} buffer, starting at
* {@code outputOffset} inclusive.
*
* If the {@code output} buffer is too small to hold the result,
* a {@code ShortBufferException} 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.
*
* Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to {@code init}.
* 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}) more data.
*
* Note: if any exception is thrown, this cipher object may need to
* be reset before it can be used again.
*
* Note: this method should be copy-safe, which means the
* {@code input} and {@code output} 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} where the input
* starts
* @param inputLen the input length
* @param output the buffer for the result
* @param outputOffset the offset in {@code output} where the result
* is stored
*
* @return the number of bytes stored in {@code output}
*
* @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");
}
chooseFirstProvider();
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.
*
* All {@code input.remaining()} bytes starting at
* {@code input.position()} 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.
*
* If {@code output.remaining()} bytes are insufficient to
* hold the result, a {@code ShortBufferException} 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.
*
* Upon finishing, this method resets this cipher object to the state
* it was in when previously initialized via a call to {@code init}.
* 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}) more data.
*
* Note: if any exception is thrown, this cipher object may need to
* be reset before it can be used again.
*
* Note: this method should be copy-safe, which means the
* {@code input} and {@code output} 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}
*
* @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();
}
chooseFirstProvider();
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");
}
}
chooseFirstProvider();
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 PRIVATE_KEY}, or
* {@code PUBLIC_KEY}.
*
* @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} for the
* {@code wrappedKeyAlgorithm}.
*
* @exception InvalidKeyException if {@code wrappedKey} does not
* represent a wrapped key of type {@code wrappedKeyType} for
* the {@code wrappedKeyAlgorithm}.
*
* @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");
}
chooseFirstProvider();
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;
}
private static CryptoPermission getConfiguredPermission(
String transformation) throws NullPointerException,
NoSuchAlgorithmException {
if (transformation == null) throw new NullPointerException();
String[] parts = tokenizeTransformation(transformation);
return JceSecurityManager.INSTANCE.getCryptoPermission(parts[0]);
}
/**
* 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
*
* Java Cryptography Architecture Reference Guide.
*
* @param transformation the cipher transformation.
* @return the maximum key length in bits or Integer.MAX_VALUE.
* @exception NullPointerException if {@code transformation} is null.
* @exception NoSuchAlgorithmException if {@code transformation}
* 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 {
CryptoPermission cp = getConfiguredPermission(transformation);
return cp.getMaxKeySize();
}
/**
* 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}
* is null.
* @exception NoSuchAlgorithmException if {@code transformation}
* 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 {
CryptoPermission cp = getConfiguredPermission(transformation);
return cp.getAlgorithmParameterSpec();
}
/**
* Continues a multi-part update of the Additional Authentication
* Data (AAD).
*
* 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.
*
* 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");
}
chooseFirstProvider();
if (len == 0) {
return;
}
spi.engineUpdateAAD(src, offset, len);
}
/**
* Continues a multi-part update of the Additional Authentication
* Data (AAD).
*
* 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).
*
* 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");
}
chooseFirstProvider();
if (src.remaining() == 0) {
return;
}
spi.engineUpdateAAD(src);
}
}