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PBKDF2Core.java
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PBKDF2Core.java
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/*
* Copyright (c) 2005, 2022, 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 com.sun.crypto.provider;
import java.security.InvalidKeyException;
import java.security.spec.KeySpec;
import java.security.spec.InvalidKeySpecException;
import java.util.Arrays;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactorySpi;
import javax.crypto.spec.PBEKeySpec;
/**
* This class implements a key factory for PBE keys derived using
* PBKDF2 with HmacSHA1, HmacSHA224, HmacSHA256, HmacSHA384, HmacSHA512,
* HmacSHA512/224, and HmacSHA512/256 pseudo random function (PRF) as
* defined in PKCS#5 v2.1.
*
* @author Valerie Peng
*
*/
abstract class PBKDF2Core extends SecretKeyFactorySpi {
private final String prfAlgo;
PBKDF2Core(String prfAlgo) {
this.prfAlgo = prfAlgo;
}
/**
* Generates a <code>SecretKey</code> object from the provided key
* specification (key material).
*
* @param keySpec the specification (key material) of the secret key
*
* @return the secret key
*
* @exception InvalidKeySpecException if the given key specification
* is inappropriate for this key factory to produce a public key.
*/
protected SecretKey engineGenerateSecret(KeySpec keySpec)
throws InvalidKeySpecException
{
if (keySpec instanceof PBEKeySpec ks) {
return new PBKDF2KeyImpl(ks, prfAlgo);
} else {
throw new InvalidKeySpecException("Only PBEKeySpec is accepted");
}
}
/**
* Returns a specification (key material) of the given key
* in the requested format.
*
* @param key the key
*
* @param keySpecCl the requested format in which the key material shall be
* returned
*
* @return the underlying key specification (key material) in the
* requested format
*
* @exception InvalidKeySpecException if the requested key
* specification is inappropriate for the given key, or the
* given key cannot be processed (e.g., the given key has an
* unrecognized algorithm or format).
*/
protected KeySpec engineGetKeySpec(SecretKey key, Class<?> keySpecCl)
throws InvalidKeySpecException {
if (key instanceof javax.crypto.interfaces.PBEKey pKey) {
// Check if requested key spec is amongst the valid ones
if ((keySpecCl != null)
&& keySpecCl.isAssignableFrom(PBEKeySpec.class)) {
char[] passwd = pKey.getPassword();
byte[] encoded = pKey.getEncoded();
try {
return new PBEKeySpec(passwd, pKey.getSalt(),
pKey.getIterationCount(), encoded.length * 8);
} finally {
if (passwd != null) {
Arrays.fill(passwd, (char) 0);
}
Arrays.fill(encoded, (byte)0);
}
} else {
throw new InvalidKeySpecException
("Only PBEKeySpec is accepted");
}
} else {
throw new InvalidKeySpecException("Only PBEKey is accepted");
}
}
/**
* Translates a <code>SecretKey</code> object, whose provider may be
* unknown or potentially untrusted, into a corresponding
* <code>SecretKey</code> object of this key factory.
*
* @param key the key whose provider is unknown or untrusted
*
* @return the translated key
*
* @exception InvalidKeyException if the given key cannot be processed by
* this key factory.
*/
protected SecretKey engineTranslateKey(SecretKey key)
throws InvalidKeyException {
if ((key != null) &&
(key.getAlgorithm().equalsIgnoreCase("PBKDF2With" + prfAlgo)) &&
(key.getFormat().equalsIgnoreCase("RAW"))) {
// Check if key originates from this factory
if (key instanceof com.sun.crypto.provider.PBKDF2KeyImpl) {
return key;
}
// Check if key implements the PBEKey
if (key instanceof javax.crypto.interfaces.PBEKey pKey) {
char[] password = pKey.getPassword();
byte[] encoding = pKey.getEncoded();
PBEKeySpec spec =
new PBEKeySpec(password,
pKey.getSalt(),
pKey.getIterationCount(),
encoding.length*8);
try {
return new PBKDF2KeyImpl(spec, prfAlgo);
} catch (InvalidKeySpecException re) {
throw new InvalidKeyException
("Invalid key component(s)", re);
} finally {
if (password != null) {
Arrays.fill(password, (char) 0);
spec.clearPassword();
}
Arrays.fill(encoding, (byte)0);
}
} else {
throw new InvalidKeyException("Only PBEKey is accepted");
}
}
throw new InvalidKeyException("Only PBKDF2With" + prfAlgo +
" key with RAW format is accepted");
}
public static final class HmacSHA1 extends PBKDF2Core {
public HmacSHA1() {
super("HmacSHA1");
}
}
public static final class HmacSHA224 extends PBKDF2Core {
public HmacSHA224() {
super("HmacSHA224");
}
}
public static final class HmacSHA256 extends PBKDF2Core {
public HmacSHA256() {
super("HmacSHA256");
}
}
public static final class HmacSHA384 extends PBKDF2Core {
public HmacSHA384() {
super("HmacSHA384");
}
}
public static final class HmacSHA512 extends PBKDF2Core {
public HmacSHA512() {
super("HmacSHA512");
}
}
public static final class HmacSHA512_224 extends PBKDF2Core {
public HmacSHA512_224() {
super("HmacSHA512/224");
}
}
public static final class HmacSHA512_256 extends PBKDF2Core {
public HmacSHA512_256() {
super("HmacSHA512/256");
}
}
}