/* * Copyright (c) 2002, 2007, 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.io.UnsupportedEncodingException;import java.security.*;import java.security.spec.*;import javax.crypto.*;import javax.crypto.spec.*; /** * This class represents password-based encryption as defined by the PKCS #5 * standard. * * @author Jan Luehe * * * @see javax.crypto.Cipher */final class PBECipherCore {     // the encapsulated DES cipher    private CipherCore cipher;    private MessageDigest md;    private int blkSize;    private String algo = null;    private byte[] salt = null;    private int iCount = 10;     /**     * Creates an instance of PBE Cipher using the specified CipherSpi     * instance.     *     */    PBECipherCore(String cipherAlg) throws NoSuchAlgorithmException,        NoSuchPaddingException {        algo = cipherAlg;        if (algo.equals("DES")) {            cipher = new CipherCore(new DESCrypt(),                                    DESConstants.DES_BLOCK_SIZE);        } else if (algo.equals("DESede")) {             cipher = new CipherCore(new DESedeCrypt(),                                    DESConstants.DES_BLOCK_SIZE);        } else {            throw new NoSuchAlgorithmException("No Cipher implementation " +                                               "for PBEWithMD5And" + algo);        }        cipher.setMode("CBC");        cipher.setPadding("PKCS5Padding");        // get instance of MD5        md = MessageDigest.getInstance("MD5");    }     /**     * Sets the mode of this cipher. This algorithm can only be run in CBC     * mode.     *     * @param mode the cipher mode     *     * @exception NoSuchAlgorithmException if the requested cipher mode is     * invalid     */    void setMode(String mode) throws NoSuchAlgorithmException {        cipher.setMode(mode);    }      /**     * Sets the padding mechanism of this cipher. This algorithm only uses     * PKCS #5 padding.     *     * @param padding the padding mechanism     *     * @exception NoSuchPaddingException if the requested padding mechanism     * is invalid     */    void setPadding(String paddingScheme) throws NoSuchPaddingException {        cipher.setPadding(paddingScheme);    }     /**     * Returns the block size (in bytes).     *     * @return the block size (in bytes)     */    int getBlockSize() {        return DESConstants.DES_BLOCK_SIZE;    }     /**     * Returns the length in bytes that an output buffer would need to be in     * order to hold the result of the next <code>update</code> or     * <code>doFinal</code> operation, given the input length     * <code>inputLen</code> (in bytes).     *     * <p>This call takes into account any unprocessed (buffered) data from a     * previous <code>update</code> call, and padding.     *     * <p>The actual output length of the next <code>update</code> or     * <code>doFinal</code> call may be smaller than the length returned by     * this method.     *     * @param inputLen the input length (in bytes)     *     * @return the required output buffer size (in bytes)     *     */    int getOutputSize(int inputLen) {        return cipher.getOutputSize(inputLen);    }     /**     * Returns the initialization vector (IV) in a new buffer.     *     * <p> This is useful in the case where a random IV has been created     * (see <a href = "#init">init</a>),     * 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.     */    byte[] getIV() {        return cipher.getIV();    }     /**     * Returns the parameters used with this cipher.     *     * <p>The returned parameters may be the same that were used to initialize     * this cipher, or may contain the default set of parameters or a set of     * randomly generated parameters used by the underlying cipher     * implementation (provided that the underlying cipher implementation     * uses a default set of parameters or creates new parameters if it needs     * parameters but was not initialized with any).     *     * @return the parameters used with this cipher, or null if this cipher     * does not use any parameters.     */    AlgorithmParameters getParameters() {        AlgorithmParameters params = null;        if (salt == null) {            salt = new byte[8];            SunJCE.RANDOM.nextBytes(salt);        }        PBEParameterSpec pbeSpec = new PBEParameterSpec(salt, iCount);        try {            params = AlgorithmParameters.getInstance("PBEWithMD5And" +                (algo.equalsIgnoreCase("DES")? "DES":"TripleDES"), "SunJCE");        } catch (NoSuchAlgorithmException nsae) {            // should never happen            throw new RuntimeException("SunJCE called, but not configured");        } catch (NoSuchProviderException nspe) {            // should never happen            throw new RuntimeException("SunJCE called, but not configured");        }        try {            params.init(pbeSpec);        } catch (InvalidParameterSpecException ipse) {            // should never happen            throw new RuntimeException("PBEParameterSpec not supported");        }        return params;    }     /**     * 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</code>.     *     * <p>If this cipher (including its underlying feedback or padding scheme)     * requires any random bytes, it will get them from <code>random</code>.     *     * @param opmode the operation mode of this cipher (this is one of     * the following:     * <code>ENCRYPT_MODE</code>, <code>DECRYPT_MODE</code>),     * <code>WRAP_MODE</code> or <code>UNWRAP_MODE</code>)     * @param key the encryption key     * @param params the algorithm parameters     * @param random the source of randomness     *     * @exception InvalidKeyException if the given key is inappropriate for     * initializing this cipher     * @exception InvalidAlgorithmParameterException if the given algorithm     * parameters are inappropriate for this cipher     */    void init(int opmode, Key key, AlgorithmParameterSpec params,              SecureRandom random)        throws InvalidKeyException, InvalidAlgorithmParameterException {        if (((opmode == Cipher.DECRYPT_MODE) ||             (opmode == Cipher.UNWRAP_MODE)) && (params == null)) {            throw new InvalidAlgorithmParameterException("Parameters "                                                         + "missing");        }        if ((key == null) ||            (key.getEncoded() == null) ||            !(key.getAlgorithm().regionMatches(true, 0, "PBE", 0, 3))) {            throw new InvalidKeyException("Missing password");        }         if (params == null) {            // create random salt and use default iteration count            salt = new byte[8];            random.nextBytes(salt);        } else {            if (!(params instanceof PBEParameterSpec)) {                throw new InvalidAlgorithmParameterException                    ("Wrong parameter type: PBE expected");            }            salt = ((PBEParameterSpec) params).getSalt();            // salt must be 8 bytes long (by definition)            if (salt.length != 8) {                throw new InvalidAlgorithmParameterException                    ("Salt must be 8 bytes long");            }            iCount = ((PBEParameterSpec) params).getIterationCount();            if (iCount <= 0) {                throw new InvalidAlgorithmParameterException                    ("IterationCount must be a positive number");            }        }         byte[] derivedKey = deriveCipherKey(key);        // use all but the last 8 bytes as the key value        SecretKeySpec cipherKey = new SecretKeySpec(derivedKey, 0,                                                    derivedKey.length-8, algo);        // use the last 8 bytes as the IV        IvParameterSpec ivSpec = new IvParameterSpec(derivedKey,                                                     derivedKey.length-8,                                                     8);        // initialize the underlying cipher        cipher.init(opmode, cipherKey, ivSpec, random);    }     private byte[] deriveCipherKey(Key key) {         byte[] result = null;        byte[] passwdBytes = key.getEncoded();         if (algo.equals("DES")) {            // P || S (password concatenated with salt)            byte[] concat = new byte[passwdBytes.length + salt.length];            System.arraycopy(passwdBytes, 0, concat, 0, passwdBytes.length);            java.util.Arrays.fill(passwdBytes, (byte)0x00);            System.arraycopy(salt, 0, concat, passwdBytes.length, salt.length);             // digest P || S with c iterations            byte[] toBeHashed = concat;            for (int i = 0; i < iCount; i++) {                md.update(toBeHashed);                toBeHashed = md.digest(); // this resets the digest            }            java.util.Arrays.fill(concat, (byte)0x00);            result = toBeHashed;        } else if (algo.equals("DESede")) {            // if the 2 salt halves are the same, invert one of them            int i;            for (i=0; i<4; i++) {                if (salt[i] != salt[i+4])                    break;            }            if (i==4) { // same, invert 1st half                for (i=0; i<2; i++) {                    byte tmp = salt[i];                    salt[i] = salt[3-i];                    salt[3-1] = tmp;                }            }             // Now digest each half (concatenated with password). For each            // half, go through the loop as many times as specified by the            // iteration count parameter (inner for loop).            // Concatenate the output from each digest round with the            // password, and use the result as the input to the next digest            // operation.            byte[] kBytes = null;            IvParameterSpec iv = null;            byte[] toBeHashed = null;            result = new byte[DESedeKeySpec.DES_EDE_KEY_LEN +                              DESConstants.DES_BLOCK_SIZE];            for (i = 0; i < 2; i++) {                toBeHashed = new byte[salt.length/2];                System.arraycopy(salt, i*(salt.length/2), toBeHashed, 0,                                 toBeHashed.length);                for (int j=0; j < iCount; j++) {                    md.update(toBeHashed);                    md.update(passwdBytes);                    toBeHashed = md.digest(); // this resets the digest                }                System.arraycopy(toBeHashed, 0, result, i*16,                                 toBeHashed.length);            }        }        return result;    }     void init(int opmode, Key key, AlgorithmParameters params,              SecureRandom random)        throws InvalidKeyException, InvalidAlgorithmParameterException {        PBEParameterSpec pbeSpec = null;        if (params != null) {            try {                pbeSpec = (PBEParameterSpec) params.getParameterSpec                    (PBEParameterSpec.class);            } catch (InvalidParameterSpecException ipse) {                throw new InvalidAlgorithmParameterException("Wrong parameter "                                                             + "type: PBE "                                                             + "expected");            }        }        init(opmode, key, pbeSpec, random);    }     /**     * Continues a multiple-part encryption or decryption operation     * (depending on how this cipher was initialized), processing another data     * part.     *     * <p>The first <code>inputLen</code> bytes in the <code>input</code>     * buffer, starting at <code>inputOffset</code>, are processed, and the     * result is stored in a new buffer.     *     * @param input the input buffer     * @param inputOffset the offset in <code>input</code> where the input     * starts     * @param inputLen the input length     *     * @return the new buffer with the result     *     */    byte[] update(byte[] input, int inputOffset, int inputLen) {        return cipher.update(input, inputOffset, inputLen);    }     /**     * Continues a multiple-part encryption or decryption operation     * (depending on how this cipher was initialized), processing another data     * part.     *     * <p>The first <code>inputLen</code> bytes in the <code>input</code>     * buffer, starting at <code>inputOffset</code>, are processed, and the     * result is stored in the <code>output</code> buffer, starting at     * <code>outputOffset</code>.     *     * @param input the input buffer     * @param inputOffset the offset in <code>input</code> where the input     * starts     * @param inputLen the input length     * @param output the buffer for the result     * @param outputOffset the offset in <code>output</code> where the result     * is stored     *     * @return the number of bytes stored in <code>output</code>     *     * @exception ShortBufferException if the given output buffer is too small     * to hold the result     */    int update(byte[] input, int inputOffset, int inputLen,               byte[] output, int outputOffset)        throws ShortBufferException {        return cipher.update(input, inputOffset, inputLen,                             output, outputOffset);    }     /**     * Encrypts or decrypts data in a single-part operation,     * or finishes a multiple-part operation.     * The data is encrypted or decrypted, depending on how this cipher was     * initialized.     *     * <p>The first <code>inputLen</code> bytes in the <code>input</code>     * buffer, starting at <code>inputOffset</code>, and any input bytes that     * may have been buffered during a previous <code>update</code> operation,     * are processed, with padding (if requested) being applied.     * The result is stored in a new buffer.     *     * <p>The cipher is reset to its initial state (uninitialized) after this     * call.     *     * @param input the input buffer     * @param inputOffset the offset in <code>input</code> where the input     * starts     * @param inputLen the input length     *     * @return the new buffer with the result     *     * @exception 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     * @exception BadPaddingException if decrypting and padding is choosen,     * but the last input data does not have proper padding bytes.     */    byte[] doFinal(byte[] input, int inputOffset, int inputLen)        throws IllegalBlockSizeException, BadPaddingException {        return cipher.doFinal(input, inputOffset, inputLen);    }     /**     * Encrypts or decrypts data in a single-part operation,     * or finishes a multiple-part operation.     * The data is encrypted or decrypted, depending on how this cipher was     * initialized.     *     * <p>The first <code>inputLen</code> bytes in the <code>input</code>     * buffer, starting at <code>inputOffset</code>, and any input bytes that     * may have been buffered during a previous <code>update</code> operation,     * are processed, with padding (if requested) being applied.     * The result is stored in the <code>output</code> buffer, starting at     * <code>outputOffset</code>.     *     * <p>The cipher is reset to its initial state (uninitialized) after this     * call.     *     * @param input the input buffer     * @param inputOffset the offset in <code>input</code> where the input     * starts     * @param inputLen the input length     * @param output the buffer for the result     * @param outputOffset the offset in <code>output</code> where the result     * is stored     *     * @return the number of bytes stored in <code>output</code>     *     * @exception 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     * @exception ShortBufferException if the given output buffer is too small     * to hold the result     * @exception BadPaddingException if decrypting and padding is choosen,     * but the last input data does not have proper padding bytes.     */    int doFinal(byte[] input, int inputOffset, int inputLen,                byte[] output, int outputOffset)        throws ShortBufferException, IllegalBlockSizeException,               BadPaddingException {        return cipher.doFinal(input, inputOffset, inputLen,                                    output, outputOffset);    }     /**     * Wrap a key.     *     * @param key the key to be wrapped.     *     * @return the wrapped key.     *     * @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).     */    byte[] wrap(Key key)        throws IllegalBlockSizeException, InvalidKeyException {        byte[] result = null;         try {            byte[] encodedKey = key.getEncoded();            if ((encodedKey == null) || (encodedKey.length == 0)) {                throw new InvalidKeyException("Cannot get an encoding of " +                                              "the key to be wrapped");            }             result = doFinal(encodedKey, 0, encodedKey.length);        } catch (BadPaddingException e) {            // Should never happen        }         return result;

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