/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package javax.crypto;
import java.nio.ByteBuffer;
import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.InvalidParameterException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Provider;
import java.security.SecureRandom;
import java.security.Security;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.security.spec.AlgorithmParameterSpec;
import java.util.Set;
import java.util.StringTokenizer;
import org.apache.harmony.crypto.internal.NullCipherSpi;
import org.apache.harmony.crypto.internal.nls.Messages;
import org.apache.harmony.security.fortress.Engine;
/**
* This class provides access to implementations of cryptographic ciphers for
* encryption and decryption. Cipher classes can not be instantiated directly,
* one has to call the Cipher's {@code getInstance} method with the name of a
* requested transformation, optionally with a provider. A transformation
* specifies an operation (or a set of operations) as a string in the form:
* <ul>
* <li><i>"algorithm/mode/padding"</i></li> or
* <li><i>"algorithm"</i></li>
* </ul>
* <i>algorithm</i> is the name of a cryptographic algorithm, <i>mode</i> is the
* name of a feedback mode and <i>padding</i> is the name of a padding scheme.
* If <i>mode</i> and/or <i>padding</i> values are omitted, provider specific
* default values will be used.
* <p>
* A valid transformation would be:
* <ul>
* {@code Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");}
* </ul>
* When a block cipher is requested in in stream cipher mode, the number of bits
* to be processed at a time can be optionally specified by appending it to the
* mode name. e.g. <i>"AES/CFB8/NoPadding"</i>. If no number is specified, a
* provider specific default value is used.
* </p>
*
* @since Android 1.0
*/
public class Cipher {
/**
* Constant for decryption operation mode.
*
* @since Android 1.0
*/
public static final int DECRYPT_MODE = 2;
/**
* Constant for encryption operation mode.
*
* @since Android 1.0
*/
public static final int ENCRYPT_MODE = 1;
/**
* Constant indicating that the key to be unwrapped is a private key.
*
* @since Android 1.0
*/
public static final int PRIVATE_KEY = 2;
/**
* Constant indicating that the key to be unwrapped is a public key.
*
* @since Android 1.0
*/
public static final int PUBLIC_KEY = 1;
/**
* Constant indicating that the key to be unwrapped is a secret key.
*
* @since Android 1.0
*/
public static final int SECRET_KEY = 3;
/**
* Constant for key unwrapping operation mode.
*
* @since Android 1.0
*/
public static final int UNWRAP_MODE = 4;
/**
* Constant for key wrapping operation mode.
*
* @since Android 1.0
*/
public static final int WRAP_MODE = 3;
private int mode;
/**
* The service name.
*/
private static final String SERVICE = "Cipher"; //$NON-NLS-1$
/**
* Used to access common engine functionality.
*/
private static final Engine engine = new Engine(SERVICE);
/**
* The provider.
*/
private Provider provider;
/**
* The SPI implementation.
*/
private CipherSpi spiImpl;
/**
* The transformation.
*/
private String transformation;
private static SecureRandom sec_rand;
/**
* Creates a new Cipher instance.
*
* @param cipherSpi
* the implementation delegate of the cipher.
* @param provider
* the provider of the implementation of this cipher.
* @param transformation
* the name of the transformation that this cipher performs.
* @throws NullPointerException
* if either cipherSpi is {@code null} or provider is {@code
* null} and {@code cipherSpi} is a {@code NullCipherSpi}.
* @since Android 1.0
*/
protected Cipher(CipherSpi cipherSpi, Provider provider,
String transformation) {
if (cipherSpi == null) {
throw new NullPointerException();
}
if (!(cipherSpi instanceof NullCipherSpi) && provider == null) {
throw new NullPointerException();
}
this.provider = provider;
this.transformation = transformation;
this.spiImpl = cipherSpi;
}
/**
* Creates a new Cipher for the specified transformation. The installed
* providers are searched in order for an implementation of the specified
* transformation. The first found provider providing the transformation is
* used to create the cipher. If no provider is found an exception is
* thrown.
*
* @param transformation
* the name of the transformation to create a cipher for.
* @return a cipher for the requested transformation.
* @throws NoSuchAlgorithmException
* if no installed provider can provide the
* <i>transformation</i>, or it is {@code null}, empty or in an
* invalid format.
* @throws NoSuchPaddingException
* if no installed provider can provide the padding scheme in
* the <i>transformation</i>.
* @since Android 1.0
*/
public static final Cipher getInstance(String transformation)
throws NoSuchAlgorithmException, NoSuchPaddingException {
return getCipher(transformation, null);
}
/**
* Creates a new cipher for the specified transformation provided by the
* specified provider.
*
* @param transformation
* the name of the transformation to create a cipher for.
* @param provider
* the name of the provider to ask for the transformation.
* @return a cipher for the requested transformation.
* @throws NoSuchAlgorithmException
* if the specified provider can not provide the
* <i>transformation</i>, or it is {@code null}, empty or in an
* invalid format.
* @throws NoSuchProviderException
* if no provider with the specified name can be found.
* @throws NoSuchPaddingException
* if the requested padding scheme in the <i>transformation</i>
* is not available.
* @throws IllegalArgumentException
* if the specified provider is {@code null}.
* @since Android 1.0
*/
public static final Cipher getInstance(String transformation,
String provider) throws NoSuchAlgorithmException,
NoSuchProviderException, NoSuchPaddingException {
if (provider == null) {
throw new IllegalArgumentException(Messages.getString("crypto.04")); //$NON-NLS-1$
}
Provider p = Security.getProvider(provider);
if (p == null) {
throw new NoSuchProviderException(Messages.getString("crypto.16", provider)); //$NON-NLS-1$
}
return getInstance(transformation, p);
}
/**
* Creates a new cipher for the specified transformation.
*
* @param transformation
* the name of the transformation to create a cipher for.
* @param provider
* the provider to ask for the transformation.
* @return a cipher for the requested transformation.
* @throws NoSuchAlgorithmException
* if the specified provider can not provide the
* <i>transformation</i>, or it is {@code null}, empty or in an
* invalid format.
* @throws NoSuchPaddingException
* if the requested padding scheme in the <i>transformation</i>
* is not available.
* @throws IllegalArgumentException
* if the provider is {@code null}.
* @since Android 1.0
*/
public static final Cipher getInstance(String transformation,
Provider provider) throws NoSuchAlgorithmException,
NoSuchPaddingException {
if (provider == null) {
throw new IllegalArgumentException(Messages.getString("crypto.04")); //$NON-NLS-1$
}
Cipher c = getCipher(transformation, provider);
return c;
}
/**
* Find appropriate Cipher according the specification rules
*
* @param transformation
* @param provider
* @return
* @throws NoSuchAlgorithmException
* @throws NoSuchPaddingException
*/
private static synchronized Cipher getCipher(String transformation, Provider provider)
throws NoSuchAlgorithmException, NoSuchPaddingException {
if (transformation == null || "".equals(transformation)) { //$NON-NLS-1$
throw new NoSuchAlgorithmException(Messages.getString("crypto.17", //$NON-NLS-1$
transformation));
}
String[] transf = checkTransformation(transformation);
boolean needSetPadding = false;
boolean needSetMode = false;
if (transf[1] == null && transf[2] == null) { // "algorithm"
if (provider == null) {
engine.getInstance(transf[0], null);
} else {
engine.getInstance(transf[0], provider, null);
}
} else {
String[] searhOrder = {
transf[0] + "/" + transf[1] + "/" + transf[2], // "algorithm/mode/padding" //$NON-NLS-1$ //$NON-NLS-2$
transf[0] + "/" + transf[1], // "algorithm/mode" //$NON-NLS-1$
transf[0] + "//" + transf[2], // "algorithm//padding" //$NON-NLS-1$
transf[0] // "algorithm"
};
int i;
for (i = 0; i < searhOrder.length; i++) {
try {
if (provider == null) {
engine.getInstance(searhOrder[i], null);
} else {
engine.getInstance(searhOrder[i], provider, null);
}
break;
} catch (NoSuchAlgorithmException e) {
if ( i == searhOrder.length-1) {
throw new NoSuchAlgorithmException(transformation);
}
}
}
switch (i) {
case 1: // "algorithm/mode"
needSetPadding = true;
break;
case 2: // "algorithm//padding"
needSetMode = true;
break;
case 3: // "algorithm"
needSetPadding = true;
needSetMode = true;
}
}
CipherSpi cspi;
try {
cspi = (CipherSpi) engine.spi;
} catch (ClassCastException e) {
throw new NoSuchAlgorithmException(e);
}
Cipher c = new Cipher(cspi, engine.provider, transformation);
if (needSetMode) {
c.spiImpl.engineSetMode(transf[1]);
}
if (needSetPadding) {
c.spiImpl.engineSetPadding(transf[2]);
}
return c;
}
private static String[] checkTransformation(String transformation)
throws NoSuchAlgorithmException {
String[] transf = { null, null, null };
StringTokenizer st;
int i = 0;
for (st = new StringTokenizer(transformation, "/"); st //$NON-NLS-1$
.hasMoreElements();) {
if (i > 2) {
throw new NoSuchAlgorithmException(Messages.getString("crypto.17", //$NON-NLS-1$
transformation));
}
transf[i] = st.nextToken();
if (transf[i] != null) {
transf[i] = transf[i].trim();
if ("".equals(transf[i])) { //$NON-NLS-1$
transf[i] = null;
}
i++;
}
}
if (transf[0] == null) {
throw new NoSuchAlgorithmException(Messages.getString("crypto.17", //$NON-NLS-1$
transformation));
}
if (!(transf[1] == null && transf[2] == null)
&& (transf[1] == null || transf[2] == null)) {
throw new NoSuchAlgorithmException(Messages.getString("crypto.17", //$NON-NLS-1$
transformation));
}
return transf;
}
/**
* Returns the provider of this cipher instance.
*
* @return the provider of this cipher instance.
* @since Android 1.0
*/
public final Provider getProvider() {
return provider;
}
/**
* Returns the name of the algorithm of this cipher instance.
* <p>
* This is the name of the <i>transformation</i> argument used in the
* {@code getInstance} call creating this object.
* </p>
*
* @return the name of the algorithm of this cipher instance.
* @since Android 1.0.
*/
public final String getAlgorithm() {
return transformation;
}
/**
* Returns this ciphers block size (in bytes).
*
* @return this ciphers block size.
* @since Android 1.0
*/
public final int getBlockSize() {
return spiImpl.engineGetBlockSize();
}
/**
* Returns the length in bytes an output buffer needs to be when this cipher
* is updated with {@code inputLen} bytes.
*
* @param inputLen
* the number of bytes of the input.
* @return the output buffer length for the input length.
* @throws IllegalStateException
* if this cipher instance is in an invalid state.
* @since Android 1.0
*/
public final int getOutputSize(int inputLen) {
if (mode == 0) {
throw new IllegalStateException(
Messages.getString("crypto.18")); //$NON-NLS-1$
}
return spiImpl.engineGetOutputSize(inputLen);
}
/**
* Returns the <i>initialization vector</i> for this cipher instance.
*
* @return the <i>initialization vector</i> for this cipher instance.
* @since Android 1.0
*/
public final byte[] getIV() {
return spiImpl.engineGetIV();
}
/**
* Returns the parameters that where used to create this cipher instance.
* <p>
* These may be a the same parameters that were used to create this cipher
* instance, or may be a combination of default and random parameters,
* depending on the underlying cipher implementation.
*
* @return the parameters that where used to create this cipher instance, or
* {@code null} if this cipher instance does not have any
* parameters.
* @since Android 1.0
*/
public final AlgorithmParameters getParameters() {
return spiImpl.engineGetParameters();
}
/**
* Returns the exemption mechanism associated with this cipher.
*
* @return currently {@code null}
* @since Android 1.0
*/
public final ExemptionMechanism getExemptionMechanism() {
//FIXME implement getExemptionMechanism
// try {
// return ExemptionMechanism.getInstance(transformation, provider);
// } catch (NoSuchAlgorithmException e) {
return null;
// }
}
/**
* Initializes this cipher instance with the specified key.
* <p>
* The cipher is initialized for the specified operational mode (one of:
* encryption, decryption, key wrapping or key unwrapping) depending on
* {@code opmode}.
* </p>
* If this cipher instance needs any algorithm parameters or random values
* that the specified key can not provide, the underlying implementation of
* this cipher is supposed to generate the required parameters (using its
* provider or random values).
* <p>
* When a cipher instance is initialized by a call to any of the {@code
* init} methods, the state of the instance is overridden, meaning that it
* is equivalent to creating a new instance and calling its {@code init}
* method.
* </p>
*
* @param opmode
* the operation this cipher instance should be initialized for
* (one of: {@code ENCRYPT_MODE}, {@code DECRYPT_MODE}, {@code
* WRAP_MODE} or {@code UNWRAP_MODE}).
* @param key
* the input key for the operation.
* @throws InvalidKeyException
* if the specified key can not be used to initialize this
* cipher instance.
* @since Android 1.0
*/
public final void init(int opmode, Key key) throws InvalidKeyException {
if (sec_rand == null) {
// In theory it might be thread-unsafe but in the given case it's OK
// since it does not matter which SecureRandom instance is passed
// to the init()
sec_rand = new SecureRandom();
}
init(opmode, key, sec_rand);
}
/**
* Initializes this cipher instance with the specified key and a source of
* randomness.
* <p>
* The cipher is initialized for the specified operational mode (one of:
* encryption, decryption, key wrapping or key unwrapping) depending on
* {@code opmode}.
* </p>
* If this cipher instance needs any algorithm parameters or random values
* that the specified key can not provide, the underlying implementation of
* this cipher is supposed to generate the required parameters (using its
* provider or random values). Random values are generated using {@code
* random};
* <p>
* When a cipher instance is initialized by a call to any of the {@code
* init} methods, the state of the instance is overridden, means it is
* equivalent to creating a new instance and calling it {@code init} method.
* </p>
*
* @param opmode
* the operation this cipher instance should be initialized for
* (one of: {@code ENCRYPT_MODE}, {@code DECRYPT_MODE}, {@code
* WRAP_MODE} or {@code UNWRAP_MODE}).
* @param key
* the input key for the operation.
* @param random
* the source of randomness to use.
* @throws InvalidKeyException
* if the specified key can not be used to initialize this
* cipher instance.
* @throws InvalidParameterException
* if the specified opmode is invalid.
* @since Android 1.0
*/
public final void init(int opmode, Key key, SecureRandom random)
throws InvalidKeyException {
if (opmode != ENCRYPT_MODE && opmode != DECRYPT_MODE
&& opmode != UNWRAP_MODE && opmode != WRAP_MODE) {
throw new InvalidParameterException(Messages.getString("crypto.19")); //$NON-NLS-1$
}
// FIXME InvalidKeyException
// if keysize exceeds the maximum allowable keysize
// (jurisdiction policy files)
spiImpl.engineInit(opmode, key, random);
mode = opmode;
}
/**
* Initializes this cipher instance with the specified key and algorithm
* parameters.
* <p>
* The cipher is initialized for the specified operational mode (one of:
* encryption, decryption, key wrapping or key unwrapping).
* </p>
* If this cipher instance needs any algorithm parameters and {@code params}
* is {@code null}, the underlying implementation of this cipher is supposed
* to generate the required parameters (using its provider or random
* values).
* <p>
* When a cipher instance is initialized by a call to any of the {@code
* init} methods, the state of the instance is overridden, means it is
* equivalent to creating a new instance and calling it {@code init} method.
* </p>
*
* @param opmode
* the operation this cipher instance should be initialized for
* (one of: {@code ENCRYPT_MODE}, {@code DECRYPT_MODE}, {@code
* WRAP_MODE} or {@code UNWRAP_MODE}).
* @param key
* the input key for the operation.
* @param params
* the algorithm parameters.
* @throws InvalidKeyException
* if the specified key can not be used to initialize this
* cipher instance.
* @throws InvalidAlgorithmParameterException
* it the specified parameters are inappropriate for this
* cipher.
* @since Android 1.0
*/
public final void init(int opmode, Key key, AlgorithmParameterSpec params)
throws InvalidKeyException, InvalidAlgorithmParameterException {
if (sec_rand == null) {
sec_rand = new SecureRandom();
}
init(opmode, key, params, sec_rand);
}
/**
* Initializes this cipher instance with the specified key, algorithm
* parameters and a source of randomness.
* <p>
* The cipher is initialized for the specified operational mode (one of:
* encryption, decryption, key wrapping or key unwrapping) depending on
* {@code opmode}.
* <p>
* If this cipher instance needs any algorithm parameters and {@code params}
* is {@code null}, the underlying implementation of this cipher is supposed
* to generate the required parameters (using its provider or random
* values). Random values are generated using {@code random};
* <p>
* When a cipher instance is initialized by a call to any of the {@code
* init} methods, the state of the instance is overridden, meaning that it
* is equivalent to creating a new instance and calling it {@code init}
* method.
*
* @param opmode
* the operation this cipher instance should be initialized for
* (one of: {@code ENCRYPT_MODE}, {@code DECRYPT_MODE}, {@code
* WRAP_MODE} or {@code UNWRAP_MODE}).
* @param key
* the input key for the operation.
* @param params
* the algorithm parameters.
* @param random
* the source of randomness to use.
* @throws InvalidKeyException
* if the specified key can not be used to initialize this
* cipher instance.
* @throws InvalidAlgorithmParameterException
* it the specified parameters are inappropriate for this
* cipher.
* @throws InvalidParameterException
* if the specified {@code opmode} is invalid.
* @since Android 1.0
*/
public final void init(int opmode, Key key, AlgorithmParameterSpec params,
SecureRandom random) throws InvalidKeyException,
InvalidAlgorithmParameterException {
if (opmode != ENCRYPT_MODE && opmode != DECRYPT_MODE
&& opmode != UNWRAP_MODE && opmode != WRAP_MODE) {
throw new InvalidParameterException(Messages.getString("crypto.19")); //$NON-NLS-1$
}
// FIXME InvalidKeyException
// if keysize exceeds the maximum allowable keysize
// (jurisdiction policy files)
// FIXME InvalidAlgorithmParameterException
// cryptographic strength exceed the legal limits
// (jurisdiction policy files)
spiImpl.engineInit(opmode, key, params, random);
mode = opmode;
}
/**
* Initializes this cipher instance with the specified key and algorithm
* parameters.
* <p>
* The cipher is initialized for the specified operation (one of:
* encryption, decryption, key wrapping or key unwrapping) depending on
* {@code opmode}.
* </p>
* If this cipher instance needs any algorithm parameters and {@code params}
* is {@code null}, the underlying implementation of this cipher is supposed
* to generate the required parameters (using its provider or random
* values).
* <p>
* When a cipher instance is initialized by a call to any of the {@code
* init} methods, the state of the instance is overridden, meaning that it
* is equivalent to creating a new instance and calling it {@code init}
* method.
* </p>
*
* @param opmode
* the operation this cipher instance should be initialized for
* (one of: {@code ENCRYPT_MODE}, {@code DECRYPT_MODE}, {@code
* WRAP_MODE} or {@code UNWRAP_MODE}).
* @param key
* the input key for the operation.
* @param params
* the algorithm parameters.
* @throws InvalidKeyException
* if the specified key can not be used to initialize this
* cipher instance.
* @throws InvalidAlgorithmParameterException
* it the specified parameters are inappropriate for this
* cipher.
* @since Android 1.0
*/
public final void init(int opmode, Key key, AlgorithmParameters params)
throws InvalidKeyException, InvalidAlgorithmParameterException {
if (sec_rand == null) {
sec_rand = new SecureRandom();
}
init(opmode, key, params, sec_rand);
}
/**
* Initializes this cipher instance with the specified key, algorithm
* parameters and a source of randomness.
* <p>
* The cipher will be initialized for the specified operation (one of:
* encryption, decryption, key wrapping or key unwrapping) depending on
* {@code opmode}.
* </p>
* If this cipher instance needs any algorithm parameters and {@code params}
* is {@code null}, the underlying implementation of this cipher is supposed
* to generate the required parameters (using its provider or random
* values). Random values are generated using {@code random}.
* <p>
* When a cipher instance is initialized by a call to any of the {@code
* init} methods, the state of the instance is overridden, means it is
* equivalent to creating a new instance and calling it {@code init} method.
* </p>
*
* @param opmode
* the operation this cipher instance should be initialized for
* (one of: {@code ENCRYPT_MODE}, {@code DECRYPT_MODE}, {@code
* WRAP_MODE} or {@code UNWRAP_MODE}).
* @param key
* the input key for the operation.
* @param params
* the algorithm parameters.
* @param random
* the source of randomness to use.
* @throws InvalidKeyException
* if the specified key can not be used to initialize this
* cipher instance.
* @throws InvalidAlgorithmParameterException
* if the specified parameters are inappropriate for this
* cipher.
* @throws InvalidParameterException
* if the specified {@code opmode} is invalid.
* @since Android 1.0
*/
public final void init(int opmode, Key key, AlgorithmParameters params,
SecureRandom random) throws InvalidKeyException,
InvalidAlgorithmParameterException {
if (opmode != ENCRYPT_MODE && opmode != DECRYPT_MODE
&& opmode != UNWRAP_MODE && opmode != WRAP_MODE) {
throw new InvalidParameterException(Messages.getString("crypto.19")); //$NON-NLS-1$
}
// FIXME InvalidKeyException
// if keysize exceeds the maximum allowable keysize
// (jurisdiction policy files)
// FIXME InvalidAlgorithmParameterException
// cryptographic strength exceed the legal limits
// (jurisdiction policy files)
spiImpl.engineInit(opmode, key, params, random);
mode = opmode;
}
/**
* Initializes this cipher instance with the public key from the specified
* certificate.
* <p>
* The cipher will be initialized for the specified operation (one of:
* encryption, decryption, key wrapping or key unwrapping) depending on
* {@code opmode}.
* <p>
* It the type of the certificate is X.509 and the certificate has a <i>key
* usage</i> extension field marked as critical, the specified {@code
* opmode} has the be enabled for this key, otherwise an {@code
* InvalidKeyException} is thrown.
* <p>
* If this cipher instance needs any algorithm parameters that the key in
* the certificate can not provide, the underlying implementation of this
* cipher is supposed to generate the required parameters (using its
* provider or random values).
* <p>
* When a cipher instance is initialized by a call to any of the {@code
* init} methods, the state of the instance is overridden, means it is
* equivalent to creating a new instance and calling it {@code init} method.
*
* @param opmode
* the operation this cipher instance should be initialized for
* (one of: {@code ENCRYPT_MODE}, {@code DECRYPT_MODE}, {@code
* WRAP_MODE} or {@code UNWRAP_MODE}).
* @param certificate
* the certificate.
* @throws InvalidKeyException
* if the public key in the certificate can not be used to
* initialize this cipher instance.
* @since Android 1.0
*/
public final void init(int opmode, Certificate certificate)
throws InvalidKeyException {
if (sec_rand == null) {
sec_rand = new SecureRandom();
}
init(opmode, certificate, sec_rand);
}
/**
* Initializes this cipher instance with the public key from the specified
* certificate and a source of randomness.
* <p>
* The cipher will be initialized for the specified operation (one of:
* encryption, decryption, key wrapping or key unwrapping) depending on
* {@code opmode}.
* </p>
* It the type of the certificate is X.509 and the certificate has a <i>key
* usage</i> extension field marked as critical, the specified {@code
* opmode} has the be enabled for this key, otherwise an {@code
* InvalidKeyException} is thrown.
* <p>
* If this cipher instance needs any algorithm parameters that the key in
* the certificate can not provide, the underlying implementation of this
* cipher is supposed to generate the required parameters (using its
* provider or random values). Random values are generated using {@code
* random}.
* </p>
* When a cipher instance is initialized by a call to any of the {@code
* init} methods, the state of the instance is overridden, means it is
* equivalent to creating a new instance and calling it {@code init} method.
*
* @param opmode
* the operation this cipher instance should be initialized for
* (one of: {@code ENCRYPT_MODE}, {@code DECRYPT_MODE}, {@code
* WRAP_MODE} or {@code UNWRAP_MODE}).
* @param certificate
* the certificate.
* @param random
* the source of randomness to be used.
* @throws InvalidKeyException
* if the public key in the certificate can not be used to
* initialize this cipher instance.
* @since Android 1.0
*/
public final void init(int opmode, Certificate certificate,
SecureRandom random) throws InvalidKeyException {
if (opmode != ENCRYPT_MODE && opmode != DECRYPT_MODE
&& opmode != UNWRAP_MODE && opmode != WRAP_MODE) {
throw new InvalidParameterException(Messages.getString("crypto.19")); //$NON-NLS-1$
}
if (certificate instanceof X509Certificate) {
Set<String> ce = ((X509Certificate) certificate).getCriticalExtensionOIDs();
boolean critical = false;
if (ce != null && !ce.isEmpty()) {
for (String oid : ce) {
if (oid.equals("2.5.29.15")) { //KeyUsage OID = 2.5.29.15 //$NON-NLS-1$
critical = true;
break;
}
}
if (critical) {
boolean[] keyUsage = ((X509Certificate) certificate)
.getKeyUsage();
// As specified in RFC 3280 -
// Internet X.509 Public Key Infrastructure
// Certificate and Certificate Revocation List (CRL) Profile.
// (http://www.ietf.org/rfc/rfc3280.txt)
//
// KeyUsage ::= BIT STRING {digitalSignature (0),
// ...
// encipherOnly (7),
// decipherOnly (8) }
if (keyUsage != null) {
if (opmode == ENCRYPT_MODE && (!keyUsage[7])) {
throw new InvalidKeyException(
Messages.getString("crypto.1A")); //$NON-NLS-1$
} else if (opmode == DECRYPT_MODE && (!keyUsage[8])) {
throw new InvalidKeyException(
Messages.getString("crypto.1B")); //$NON-NLS-1$
}
}
}
}
}
// FIXME InvalidKeyException
// if keysize exceeds the maximum allowable keysize
// (jurisdiction policy files)
spiImpl.engineInit(opmode, certificate.getPublicKey(), random);
mode = opmode;
}
/**
* Continues a multi-part transformation (encryption or decryption). The
* transformed bytes are returned.
*
* @param input
* the input bytes to transform.
* @return the transformed bytes in a new buffer, or {@code null} if the
* input has zero length.
* @throws IllegalStateException
* if this cipher instance is not initialized for encryption or
* decryption.
* @throws IllegalArgumentException
* if the input is {@code null}.
* @since Android 1.0
*/
public final byte[] update(byte[] input) {
if (mode != ENCRYPT_MODE && mode != DECRYPT_MODE) {
throw new IllegalStateException(
Messages.getString("crypto.1C")); //$NON-NLS-1$
}
if (input == null) {
throw new IllegalArgumentException(Messages.getString("crypto.1D")); //$NON-NLS-1$
}
if (input.length == 0) {
return null;
}
return spiImpl.engineUpdate(input, 0, input.length);
}
/**
* Continues a multi-part transformation (encryption or decryption). The
* transformed bytes are returned.
*
* @param input
* the input bytes to transform.
* @param inputOffset
* the offset in the input to start.
* @param inputLen
* the length of the input to transform.
* @return the transformed bytes in a new buffer, or {@code null} if the
* input has zero length.
* @throws IllegalStateException
* if this cipher instance is not initialized for encryption or
* decryption.
* @throws IllegalArgumentException
* if the input is {@code null}, or if {@code inputOffset} and
* {@code inputLen} do not specify a valid chunk in the input
* buffer.
* @since Android 1.0
*/
public final byte[] update(byte[] input, int inputOffset, int inputLen) {
if (mode != ENCRYPT_MODE && mode != DECRYPT_MODE) {
throw new IllegalStateException(
Messages.getString("crypto.1C")); //$NON-NLS-1$
}
if (input == null) {
throw new IllegalArgumentException(Messages.getString("crypto.1D")); //$NON-NLS-1$
}
if (inputOffset < 0 || inputLen < 0
|| inputLen > input.length
|| inputOffset > input.length - inputLen) {
throw new IllegalArgumentException(
Messages.getString("crypto.1E")); //$NON-NLS-1$
}
if (input.length == 0) {
return null;
}
return spiImpl.engineUpdate(input, inputOffset, inputLen);
}
/**
* Continues a multi-part transformation (encryption or decryption). The
* transformed bytes are stored in the {@code output} buffer.
* <p>
* If the size of the {@code output} buffer is too small to hold the result,
* a {@code ShortBufferException} is thrown. Use
* {@link Cipher#getOutputSize getOutputSize} to check for the size of the
* output buffer.
* </p>
*
* @param input
* the input bytes to transform.
* @param inputOffset
* the offset in the input to start.
* @param inputLen
* the length of the input to transform.
* @param output
* the output buffer.
* @return the number of bytes placed in output.
* @throws ShortBufferException
* if the size of the {@code output} buffer is too small.
* @throws IllegalStateException
* if this cipher instance is not initialized for encryption or
* decryption.
* @throws IllegalArgumentException
* if the input is {@code null}, the output is {@code null}, or
* if {@code inputOffset} and {@code inputLen} do not specify a
* valid chunk in the input buffer.
* @since Android 1.0
*/
public final int update(byte[] input, int inputOffset, int inputLen,
byte[] output) throws ShortBufferException {
return update(input, inputOffset, inputLen, output, 0);
}
/**
* Continues a multi-part transformation (encryption or decryption). The
* transformed bytes are stored in the {@code output} buffer.
* <p>
* If the size of the {@code output} buffer is too small to hold the result,
* a {@code ShortBufferException} is thrown. Use
* {@link Cipher#getOutputSize getOutputSize} to check for the size of the
* output buffer.
* </p>
*
* @param input
* the input bytes to transform.
* @param inputOffset
* the offset in the input to start.
* @param inputLen
* the length of the input to transform.
* @param output
* the output buffer.
* @param outputOffset
* the offset in the output buffer.
* @return the number of bytes placed in output.
* @throws ShortBufferException
* if the size of the {@code output} buffer is too small.
* @throws IllegalStateException
* if this cipher instance is not initialized for encryption or
* decryption.
* @throws IllegalArgumentException
* if the input is {@code null}, the output is {@code null}, or
* if {@code inputOffset} and {@code inputLen} do not specify a
* valid chunk in the input buffer.
* @since Android 1.0
*/
public final int update(byte[] input, int inputOffset, int inputLen,
byte[] output, int outputOffset) throws ShortBufferException {
if (mode != ENCRYPT_MODE && mode != DECRYPT_MODE) {
throw new IllegalStateException(
Messages.getString("crypto.1C")); //$NON-NLS-1$
}
if (input == null) {
throw new IllegalArgumentException(Messages.getString("crypto.1D")); //$NON-NLS-1$
}
if (output == null) {
throw new IllegalArgumentException(Messages.getString("crypto.1F")); //$NON-NLS-1$
}
if (outputOffset < 0) {
throw new IllegalArgumentException(
Messages.getString("crypto.20")); //$NON-NLS-1$
}
if (inputOffset < 0 || inputLen < 0
|| inputLen > input.length
|| inputOffset > input.length - inputLen) {
throw new IllegalArgumentException(
Messages.getString("crypto.21")); //$NON-NLS-1$
}
if (input.length == 0) {
return 0;
}
return spiImpl.engineUpdate(input, inputOffset, inputLen, output,
outputOffset);
}
/**
* Continues a multi-part transformation (encryption or decryption). The
* {@code input.remaining()} bytes starting at {@code input.position()} are
* transformed and stored in the {@code output} buffer.
* <p>
* If the {@code output.remaining()} is too small to hold the transformed
* bytes a {@code ShortBufferException} is thrown. Use
* {@link Cipher#getOutputSize getOutputSize} to check for the size of the
* output buffer.
* </p>
*
* @param input
* the input buffer to transform.
* @param output
* the output buffer to store the result within.
* @return the number of bytes stored in the output buffer.
* @throws ShortBufferException
* if the size of the {@code output} buffer is too small.
* @throws IllegalStateException
* if this cipher instance is not initialized for encryption or
* decryption.
* @throws IllegalArgumentException
* if the input buffer and the output buffer are the identical
* object.
* @since Android 1.0
*/
public final int update(ByteBuffer input, ByteBuffer output)
throws ShortBufferException {
if (mode != ENCRYPT_MODE && mode != DECRYPT_MODE) {
throw new IllegalStateException(
Messages.getString("crypto.1C")); //$NON-NLS-1$
}
if (input == output) {
throw new IllegalArgumentException(
Messages.getString("crypto.22")); //$NON-NLS-1$
}
return spiImpl.engineUpdate(input, output);
}
/**
* Finishes a multi-part transformation (encryption or decryption).
* <p>
* Processes any bytes that may have been buffered in previous {@code
* update} calls.
* </p>
*
* @return the final bytes from the transformation.
* @throws IllegalBlockSizeException
* if the size of the resulting bytes is not a multiple of the
* cipher block size.
* @throws BadPaddingException
* if the padding of the data does not match the padding scheme.
* @throws IllegalStateException
* if this cipher instance is not initialized for encryption or
* decryption.
* @since Android 1.0
*/
public final byte[] doFinal() throws IllegalBlockSizeException,
BadPaddingException {
if (mode != ENCRYPT_MODE && mode != DECRYPT_MODE) {
throw new IllegalStateException(
Messages.getString("crypto.1C")); //$NON-NLS-1$
}
return spiImpl.engineDoFinal(null, 0, 0);
}
/**
* Finishes a multi-part transformation (encryption or decryption).
* <p>
* Processes any bytes that may have been buffered in previous {@code
* update} calls.
* </p>
* The final transformed bytes are stored in the {@code output} buffer.
*
* @param output
* the output buffer.
* @param outputOffset
* the offset in the output buffer.
* @return the number of bytes placed in the output buffer.
* @throws IllegalBlockSizeException
* if the size of the resulting bytes is not a multiple of the
* cipher block size.
* @throws ShortBufferException
* if the size of the {@code output} buffer is too small.
* @throws BadPaddingException
* if the padding of the data does not match the padding scheme.
* @throws IllegalStateException
* if this cipher instance is not initialized for encryption or
* decryption.
* @since Android 1.0
*/
public final int doFinal(byte[] output, int outputOffset)
throws IllegalBlockSizeException, ShortBufferException,
BadPaddingException {
if (mode != ENCRYPT_MODE && mode != DECRYPT_MODE) {
throw new IllegalStateException(
Messages.getString("crypto.1C")); //$NON-NLS-1$
}
if (outputOffset < 0) {
throw new IllegalArgumentException(
Messages.getString("crypto.20")); //$NON-NLS-1$
}
return spiImpl.engineDoFinal(null, 0, 0, output, outputOffset);
}
/**
* Finishes a multi-part transformation (encryption or decryption).
* <p>
* Processes the bytes in {@code input} buffer, and any bytes that have been
* buffered in previous {@code update} calls.
* </p>
*
* @param input
* the input buffer.
* @return the final bytes from the transformation.
* @throws IllegalBlockSizeException
* if the size of the resulting bytes is not a multiple of the
* cipher block size.
* @throws BadPaddingException
* if the padding of the data does not match the padding scheme.
* @throws IllegalStateException
* if this cipher instance is not initialized for encryption or
* decryption.
* @since Android 1.0
*/
public final byte[] doFinal(byte[] input) throws IllegalBlockSizeException,
BadPaddingException {
if (mode != ENCRYPT_MODE && mode != DECRYPT_MODE) {
throw new IllegalStateException(
Messages.getString("crypto.1C")); //$NON-NLS-1$
}
return spiImpl.engineDoFinal(input, 0, input.length);
}
/**
* Finishes a multi-part transformation (encryption or decryption).
* <p>
* Processes the {@code inputLen} bytes in {@code input} buffer at {@code
* inputOffset}, and any bytes that have been buffered in previous {@code
* update} calls.
*
* @param input
* the input buffer.
* @param inputOffset
* the offset in the input buffer.
* @param inputLen
* the length of the input
* @return the final bytes from the transformation.
* @throws IllegalBlockSizeException
* if the size of the resulting bytes is not a multiple of the
* cipher block size.
* @throws BadPaddingException
* if the padding of the data does not match the padding scheme.
* @throws IllegalStateException
* if this cipher instance is not initialized for encryption or
* decryption.
* @throws IllegalArgumentException
* if {@code inputOffset} and {@code inputLen} do not specify an
* valid chunk in the input buffer.
* @since Android 1.0
*/
public final byte[] doFinal(byte[] input, int inputOffset, int inputLen)
throws IllegalBlockSizeException, BadPaddingException {
if (mode != ENCRYPT_MODE && mode != DECRYPT_MODE) {
throw new IllegalStateException(
Messages.getString("crypto.1C")); //$NON-NLS-1$
}
if (inputOffset < 0 || inputLen < 0
|| inputOffset + inputLen > input.length) {
throw new IllegalArgumentException(
Messages.getString("crypto.1E")); //$NON-NLS-1$
}
return spiImpl.engineDoFinal(input, inputOffset, inputLen);
}
/**
* Finishes a multi-part transformation (encryption or decryption).
* <p>
* Processes the {@code inputLen} bytes in {@code input} buffer at {@code
* inputOffset}, and any bytes that have been buffered in previous {@code
* update} calls.
*
* @param input
* the input buffer.
* @param inputOffset
* the offset in the input buffer.
* @param inputLen
* the length of the input.
* @param output
* the output buffer for the transformed bytes.
* @return the number of bytes placed in the output buffer.
* @throws ShortBufferException
* if the size of the {@code output} buffer is too small.
* @throws IllegalBlockSizeException
* if the size of the resulting bytes is not a multiple of the
* cipher block size.
* @throws BadPaddingException
* if the padding of the data does not match the padding scheme.
* @throws IllegalStateException
* if this cipher instance is not initialized for encryption or
* decryption.
* @throws IllegalArgumentException
* if {@code inputOffset} and {@code inputLen} do not specify an
* valid chunk in the input buffer.
* @since Android 1.0
*/
public final int doFinal(byte[] input, int inputOffset, int inputLen,
byte[] output) throws ShortBufferException,
IllegalBlockSizeException, BadPaddingException {
return doFinal(input, inputOffset, inputLen, output, 0);
}
/**
* Finishes a multi-part transformation (encryption or decryption).
* <p>
* Processes the {@code inputLen} bytes in {@code input} buffer at {@code
* inputOffset}, and any bytes that have been buffered in previous {@code
* update} calls.
* </p>
*
* @param input
* the input buffer.
* @param inputOffset
* the offset in the input buffer.
* @param inputLen
* the length of the input.
* @param output
* the output buffer for the transformed bytes.
* @param outputOffset
* the offset in the output buffer.
* @return the number of bytes placed in the output buffer.
* @throws ShortBufferException
* if the size of the {@code output} buffer is too small.
* @throws IllegalBlockSizeException
* if the size of the resulting bytes is not a multiple of the
* cipher block size.
* @throws BadPaddingException
* if the padding of the data does not match the padding scheme.
* @throws IllegalStateException
* if this cipher instance is not initialized for encryption or
* decryption.
* @throws IllegalArgumentException
* if {@code inputOffset} and {@code inputLen} do not specify an
* valid chunk in the input buffer.
* @since Android 1.0
*/
public final int doFinal(byte[] input, int inputOffset, int inputLen,
byte[] output, int outputOffset) throws ShortBufferException,
IllegalBlockSizeException, BadPaddingException {
if (mode != ENCRYPT_MODE && mode != DECRYPT_MODE) {
throw new IllegalStateException(
Messages.getString("crypto.1C")); //$NON-NLS-1$
}
if (inputOffset < 0 || inputLen < 0
|| inputOffset + inputLen > input.length) {
throw new IllegalArgumentException(
Messages.getString("crypto.1E")); //$NON-NLS-1$
}
return spiImpl.engineDoFinal(input, inputOffset, inputLen, output,
outputOffset);
}
/**
* Finishes a multi-part transformation (encryption or decryption).
* <p>
* Processes the {@code input.remaining()} bytes in {@code input} buffer at
* {@code input.position()}, and any bytes that have been buffered in
* previous {@code update} calls. The transformed bytes are placed into
* {@code output} buffer.
* </p>
*
* @param input
* the input buffer.
* @param output
* the output buffer.
* @return the number of bytes placed into the output buffer.
* @throws ShortBufferException
* if the size of the {@code output} buffer is too small.
* @throws IllegalBlockSizeException
* if the size of the resulting bytes is not a multiple of the
* cipher block size.
* @throws BadPaddingException
* if the padding of the data does not match the padding scheme.
* @throws IllegalArgumentException
* if the input buffer and the output buffer are the same
* object.
* @throws IllegalStateException
* if this cipher instance is not initialized for encryption or
* decryption.
* @since Android 1.0
*/
public final int doFinal(ByteBuffer input, ByteBuffer output)
throws ShortBufferException, IllegalBlockSizeException,
BadPaddingException {
if (mode != ENCRYPT_MODE && mode != DECRYPT_MODE) {
throw new IllegalStateException(
Messages.getString("crypto.1C")); //$NON-NLS-1$
}
if (input == output) {
throw new IllegalArgumentException(
Messages.getString("crypto.2E")); //$NON-NLS-1$
}
return spiImpl.engineDoFinal(input, output);
}
/**
* Wraps a key using this cipher instance.
*
* @param key
* the key to wrap.
* @return the wrapped key.
* @throws IllegalBlockSizeException
* if the size of the resulting bytes is not a multiple of the
* cipher block size.
* @throws InvalidKeyException
* if this cipher instance can not wrap this key.
* @throws IllegalStateException
* if this cipher instance is not initialized for wrapping.
* @since Android 1.0
*/
public final byte[] wrap(Key key) throws IllegalBlockSizeException,
InvalidKeyException {
if (mode != WRAP_MODE) {
throw new IllegalStateException(
Messages.getString("crypto.1C")); //$NON-NLS-1$
}
return spiImpl.engineWrap(key);
}
/**
* Unwraps a key using this cipher instance.
*
* @param wrappedKey
* the wrapped key to unwrap.
* @param wrappedKeyAlgorithm
* the algorithm for the wrapped key.
* @param wrappedKeyType
* the type of the wrapped key (one of: {@code SECRET_KEY
* <code>, <code>PRIVATE_KEY} or {@code PUBLIC_KEY})
* @return the unwrapped key
* @throws InvalidKeyException
* if the {@code wrappedKey} can not be unwrapped to a key of
* type {@code wrappedKeyType} for the {@code
* wrappedKeyAlgorithm}.
* @throws NoSuchAlgorithmException
* if no provider can be found that can create a key of type
* {@code wrappedKeyType} for the {@code wrappedKeyAlgorithm}.
* @throws IllegalStateException
* if this cipher instance is not initialized for unwrapping.
* @since Android 1.0
*/
public final Key unwrap(byte[] wrappedKey, String wrappedKeyAlgorithm,
int wrappedKeyType) throws InvalidKeyException,
NoSuchAlgorithmException {
if (mode != UNWRAP_MODE) {
throw new IllegalStateException(
Messages.getString("crypto.1C")); //$NON-NLS-1$
}
return spiImpl.engineUnwrap(wrappedKey, wrappedKeyAlgorithm,
wrappedKeyType);
}
/**
* Returns the maximum key length for the specified transformation.
*
* @param transformation
* the transformation name.
* @return the maximum key length, currently {@code Integer.MAX_VALUE}.
* @throws NoSuchAlgorithmException
* if no provider for the specified {@code transformation} can
* be found.
* @throws NullPointerException
* if {@code transformation} is {@code null}.
* @since Android 1.0
*/
public static final int getMaxAllowedKeyLength(String transformation)
throws NoSuchAlgorithmException {
if (transformation == null) {
throw new NullPointerException();
}
checkTransformation(transformation);
//FIXME jurisdiction policy files
return Integer.MAX_VALUE;
}
/**
* Returns the maximum cipher parameter value for the specified
* transformation. If there is no maximum limit, {@code null} is returned.
*
* @param transformation
* the transformation name.
* @return a parameter spec holding the maximum value or {@code null}.
* Currently {@code null}.
* @throws NoSuchAlgorithmException
* if no provider for the specified {@code transformation} can
* be found.
* @throws NullPointerException
* if {@code transformation} is {@code null}.
* @since Android 1.0
*/
public static final AlgorithmParameterSpec getMaxAllowedParameterSpec(
String transformation) throws NoSuchAlgorithmException {
if (transformation == null) {
throw new NullPointerException();
}
checkTransformation(transformation);
//FIXME jurisdiction policy files
return null;
}
}
|
