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	/*
	* Copyright (c) 2012, 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 com.sun.crypto.provider;

	import java.security.*;
	import java.security.spec.*;
	import java.util.Arrays;
	import javax.crypto.*;
	import javax.crypto.spec.*;

	/**
	* This class represents password-based encryption as defined by the PKCS #5
	* standard.
	* These algorithms implement PBE with HmacSHA1/HmacSHA2-family and AES-CBC.
	* Padding is done as described in PKCS #5.
	*
	* @author Jan Luehe
	*
	*
	* @see javax.crypto.Cipher
	*/
	abstract class PBES2Core extends CipherSpi {

	private static final int DEFAULT_SALT_LENGTH = 20;
	private static final int DEFAULT_COUNT = 4096;

	// the encapsulated cipher
	private final CipherCore cipher;
	private final int keyLength; // in bits
	private final int blkSize; // in bits
	private final PBKDF2Core kdf;
	private final String pbeAlgo;
	private final String cipherAlgo;
	private int iCount = DEFAULT_COUNT;
	private byte[] salt = null;
	private IvParameterSpec ivSpec = null;

	/**
	* Creates an instance of PBE Scheme 2 according to the selected
	* password-based key derivation function and encryption scheme.
	*/
	PBES2Core(String kdfAlgo, String cipherAlgo, int keySize)
	throws NoSuchAlgorithmException, NoSuchPaddingException {

	this.cipherAlgo = cipherAlgo;
	keyLength = keySize * 8;
	pbeAlgo = "PBEWith" + kdfAlgo + "And" + cipherAlgo + "_" + keyLength;

	if (cipherAlgo.equals("AES")) {
	blkSize = AESConstants.AES_BLOCK_SIZE;
	cipher = new CipherCore(new AESCrypt(), blkSize);

	switch(kdfAlgo) {
	case "HmacSHA1":
	kdf = new PBKDF2Core.HmacSHA1();
	break;
	case "HmacSHA224":
	kdf = new PBKDF2Core.HmacSHA224();
	break;
	case "HmacSHA256":
	kdf = new PBKDF2Core.HmacSHA256();
	break;
	case "HmacSHA384":
	kdf = new PBKDF2Core.HmacSHA384();
	break;
	case "HmacSHA512":
	kdf = new PBKDF2Core.HmacSHA512();
	break;
	default:
	throw new NoSuchAlgorithmException(
	"No Cipher implementation for " + kdfAlgo);
	}
	} else {
	throw new NoSuchAlgorithmException("No Cipher implementation for " +
	pbeAlgo);
	}
	cipher.setMode("CBC");
	cipher.setPadding("PKCS5Padding");
	}

	protected void engineSetMode(String mode) throws NoSuchAlgorithmException {
	if ((mode != null) && (!mode.equalsIgnoreCase("CBC"))) {
	throw new NoSuchAlgorithmException("Invalid cipher mode: " + mode);
	}
	}

	protected void engineSetPadding(String paddingScheme)
	throws NoSuchPaddingException {
	if ((paddingScheme != null) &&
	(!paddingScheme.equalsIgnoreCase("PKCS5Padding"))) {
	throw new NoSuchPaddingException("Invalid padding scheme: " +
	paddingScheme);
	}
	}

	protected int engineGetBlockSize() {
	return blkSize;
	}

	protected int engineGetOutputSize(int inputLen) {
	return cipher.getOutputSize(inputLen);
	}

	protected byte[] engineGetIV() {
	return cipher.getIV();
	}

	protected AlgorithmParameters engineGetParameters() {
	AlgorithmParameters params = null;
	if (salt == null) {
	// generate random salt and use default iteration count
	salt = new byte[DEFAULT_SALT_LENGTH];
	SunJCE.getRandom().nextBytes(salt);
	iCount = DEFAULT_COUNT;
	}
	if (ivSpec == null) {
	// generate random IV
	byte[] ivBytes = new byte[blkSize];
	SunJCE.getRandom().nextBytes(ivBytes);
	ivSpec = new IvParameterSpec(ivBytes);
	}
	PBEParameterSpec pbeSpec = new PBEParameterSpec(salt, iCount, ivSpec);
	try {
	params = AlgorithmParameters.getInstance(pbeAlgo,
	SunJCE.getInstance());
	params.init(pbeSpec);
	} catch (NoSuchAlgorithmException nsae) {
	// should never happen
	throw new RuntimeException("SunJCE called, but not configured");
	} catch (InvalidParameterSpecException ipse) {
	// should never happen
	throw new RuntimeException("PBEParameterSpec not supported");
	}
	return params;
	}

	protected void engineInit(int opmode, Key key, SecureRandom random)
	throws InvalidKeyException {
	try {
	engineInit(opmode, key, (AlgorithmParameterSpec) null, random);
	} catch (InvalidAlgorithmParameterException ie) {
	InvalidKeyException ike =
	new InvalidKeyException("requires PBE parameters");
	ike.initCause(ie);
	throw ike;
	}
	}

	protected void engineInit(int opmode, Key key,
	AlgorithmParameterSpec params,
	SecureRandom random)
	throws InvalidKeyException, InvalidAlgorithmParameterException {

	if (key == null) {
	throw new InvalidKeyException("Null key");
	}

	byte[] passwdBytes = key.getEncoded();
	char[] passwdChars = null;
	PBEKeySpec pbeSpec;
	try {
	if ((passwdBytes == null) \|\|
	!(key.getAlgorithm().regionMatches(true, 0, "PBE", 0, 3))) {
	throw new InvalidKeyException("Missing password");
	}

	// TBD: consolidate the salt, ic and IV parameter checks below

	// Extract salt and iteration count from the key, if present
	if (key instanceof javax.crypto.interfaces.PBEKey) {
	salt = ((javax.crypto.interfaces.PBEKey)key).getSalt();
	if (salt != null && salt.length < 8) {
	throw new InvalidAlgorithmParameterException(
	"Salt must be at least 8 bytes long");
	}
	iCount = ((javax.crypto.interfaces.PBEKey)key).getIterationCount();
	if (iCount == 0) {
	iCount = DEFAULT_COUNT;
	} else if (iCount < 0) {
	throw new InvalidAlgorithmParameterException(
	"Iteration count must be a positive number");
	}
	}

	// Extract salt, iteration count and IV from the params, if present
	if (params == null) {
	if (salt == null) {
	// generate random salt and use default iteration count
	salt = new byte[DEFAULT_SALT_LENGTH];
	random.nextBytes(salt);
	iCount = DEFAULT_COUNT;
	}
	if ((opmode == Cipher.ENCRYPT_MODE) \|\|
	(opmode == Cipher.WRAP_MODE)) {
	// generate random IV
	byte[] ivBytes = new byte[blkSize];
	random.nextBytes(ivBytes);
	ivSpec = new IvParameterSpec(ivBytes);
	}
	} else {
	if (!(params instanceof PBEParameterSpec)) {
	throw new InvalidAlgorithmParameterException
	("Wrong parameter type: PBE expected");
	}
	// salt and iteration count from the params take precedence
	byte[] specSalt = ((PBEParameterSpec) params).getSalt();
	if (specSalt != null && specSalt.length < 8) {
	throw new InvalidAlgorithmParameterException(
	"Salt must be at least 8 bytes long");
	}
	salt = specSalt;
	int specICount = ((PBEParameterSpec) params).getIterationCount();
	if (specICount == 0) {
	specICount = DEFAULT_COUNT;
	} else if (specICount < 0) {
	throw new InvalidAlgorithmParameterException(
	"Iteration count must be a positive number");
	}
	iCount = specICount;

	AlgorithmParameterSpec specParams =
	((PBEParameterSpec) params).getParameterSpec();
	if (specParams != null) {
	if (specParams instanceof IvParameterSpec) {
	ivSpec = (IvParameterSpec)specParams;
	} else {
	throw new InvalidAlgorithmParameterException(
	"Wrong parameter type: IV expected");
	}
	} else if ((opmode == Cipher.ENCRYPT_MODE) \|\|
	(opmode == Cipher.WRAP_MODE)) {
	// generate random IV
	byte[] ivBytes = new byte[blkSize];
	random.nextBytes(ivBytes);
	ivSpec = new IvParameterSpec(ivBytes);
	} else {
	throw new InvalidAlgorithmParameterException(
	"Missing parameter type: IV expected");
	}
	}

	passwdChars = new char[passwdBytes.length];
	for (int i = 0; i < passwdChars.length; i++)
	passwdChars[i] = (char) (passwdBytes[i] & 0x7f);

	pbeSpec = new PBEKeySpec(passwdChars, salt, iCount, keyLength);
	// password char[] was cloned in PBEKeySpec constructor,
	// so we can zero it out here
	} finally {
	if (passwdChars != null) Arrays.fill(passwdChars, '\0');
	if (passwdBytes != null) Arrays.fill(passwdBytes, (byte)0x00);
	}

	SecretKey s = null;

	try {
	s = kdf.engineGenerateSecret(pbeSpec);

	} catch (InvalidKeySpecException ikse) {
	InvalidKeyException ike =
	new InvalidKeyException("Cannot construct PBE key");
	ike.initCause(ikse);
	throw ike;
	}
	byte[] derivedKey = s.getEncoded();
	SecretKeySpec cipherKey = new SecretKeySpec(derivedKey, cipherAlgo);

	// initialize the underlying cipher
	cipher.init(opmode, cipherKey, ivSpec, random);
	}

	protected void engineInit(int opmode, Key key, AlgorithmParameters params,
	SecureRandom random)
	throws InvalidKeyException, InvalidAlgorithmParameterException {
	AlgorithmParameterSpec pbeSpec = null;
	if (params != null) {
	try {
	pbeSpec = params.getParameterSpec(PBEParameterSpec.class);
	} catch (InvalidParameterSpecException ipse) {
	throw new InvalidAlgorithmParameterException(
	"Wrong parameter type: PBE expected");
	}
	}
	engineInit(opmode, key, pbeSpec, random);
	}

	protected byte[] engineUpdate(byte[] input, int inputOffset, int inputLen) {
	return cipher.update(input, inputOffset, inputLen);
	}

	protected int engineUpdate(byte[] input, int inputOffset, int inputLen,
	byte[] output, int outputOffset)
	throws ShortBufferException {
	return cipher.update(input, inputOffset, inputLen,
	output, outputOffset);
	}

	protected byte[] engineDoFinal(byte[] input, int inputOffset, int inputLen)
	throws IllegalBlockSizeException, BadPaddingException {
	return cipher.doFinal(input, inputOffset, inputLen);
	}

	protected int engineDoFinal(byte[] input, int inputOffset, int inputLen,
	byte[] output, int outputOffset)
	throws ShortBufferException, IllegalBlockSizeException,
	BadPaddingException {
	return cipher.doFinal(input, inputOffset, inputLen,
	output, outputOffset);
	}

	protected int engineGetKeySize(Key key) throws InvalidKeyException {
	return keyLength;
	}

	protected byte[] engineWrap(Key key)
	throws IllegalBlockSizeException, InvalidKeyException {
	return cipher.wrap(key);
	}

	protected Key engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm,
	int wrappedKeyType)
	throws InvalidKeyException, NoSuchAlgorithmException {
	byte[] encodedKey;
	return cipher.unwrap(wrappedKey, wrappedKeyAlgorithm,
	wrappedKeyType);
	}

	public static final class HmacSHA1AndAES_128 extends PBES2Core {
	public HmacSHA1AndAES_128()
	throws NoSuchAlgorithmException, NoSuchPaddingException {
	super("HmacSHA1", "AES", 16);
	}
	}

	public static final class HmacSHA224AndAES_128 extends PBES2Core {
	public HmacSHA224AndAES_128()
	throws NoSuchAlgorithmException, NoSuchPaddingException {
	super("HmacSHA224", "AES", 16);
	}
	}

	public static final class HmacSHA256AndAES_128 extends PBES2Core {
	public HmacSHA256AndAES_128()
	throws NoSuchAlgorithmException, NoSuchPaddingException {
	super("HmacSHA256", "AES", 16);
	}
	}

	public static final class HmacSHA384AndAES_128 extends PBES2Core {
	public HmacSHA384AndAES_128()
	throws NoSuchAlgorithmException, NoSuchPaddingException {
	super("HmacSHA384", "AES", 16);
	}
	}

	public static final class HmacSHA512AndAES_128 extends PBES2Core {
	public HmacSHA512AndAES_128()
	throws NoSuchAlgorithmException, NoSuchPaddingException {
	super("HmacSHA512", "AES", 16);
	}
	}

	public static final class HmacSHA1AndAES_256 extends PBES2Core {
	public HmacSHA1AndAES_256()
	throws NoSuchAlgorithmException, NoSuchPaddingException {
	super("HmacSHA1", "AES", 32);
	}
	}

	public static final class HmacSHA224AndAES_256 extends PBES2Core {
	public HmacSHA224AndAES_256()
	throws NoSuchAlgorithmException, NoSuchPaddingException {
	super("HmacSHA224", "AES", 32);
	}
	}

	public static final class HmacSHA256AndAES_256 extends PBES2Core {
	public HmacSHA256AndAES_256()
	throws NoSuchAlgorithmException, NoSuchPaddingException {
	super("HmacSHA256", "AES", 32);
	}
	}

	public static final class HmacSHA384AndAES_256 extends PBES2Core {
	public HmacSHA384AndAES_256()
	throws NoSuchAlgorithmException, NoSuchPaddingException {
	super("HmacSHA384", "AES", 32);
	}
	}

	public static final class HmacSHA512AndAES_256 extends PBES2Core {
	public HmacSHA512AndAES_256()
	throws NoSuchAlgorithmException, NoSuchPaddingException {
	super("HmacSHA512", "AES", 32);
	}
	}
	}

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