Java example source code file (BlowfishCipher.java)

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Java - Java tags/keywords

algorithmparameters, algorithmparameterspec, badpaddingexception, blowfishcipher, ciphercore, crypto, illegalblocksizeexception, invalidalgorithmparameterexception, invalidkeyexception, key, nosuchalgorithmexception, nosuchpaddingexception, securerandom, security, shortbufferexception, string

The BlowfishCipher.java Java example source code

/*
 * Copyright (c) 1998, 2009, 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 sun.security.util.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import javax.crypto.BadPaddingException;

/**
 * This class implements the Blowfish algorithm in its various modes
 * (<code>ECB, CFB, OFB, CBC,
 * <code>PCBC) and padding schemes (PKCS5Padding,
 * <code>NoPadding, ISO10126Padding).
 *
 * <p> Blowfish is a 64-bit block cipher with a variable-length key.
 *
 * @author Jan Luehe
 *
 *
 * @see BlowfishCrypt
 * @see CipherBlockChaining
 * @see ElectronicCodeBook
 * @see CipherFeedback
 * @see OutputFeedback
 */

public final class BlowfishCipher extends CipherSpi {

    /*
     * internal CipherCore object which does the real work.
     */
    private CipherCore core = null;

    /**
     * Creates an instance of Blowfish cipher with default ECB mode and
     * PKCS5Padding.
     */
    public BlowfishCipher() {
        core = new CipherCore(new BlowfishCrypt(),
                              BlowfishConstants.BLOWFISH_BLOCK_SIZE);
    }

    /**
     * Sets the mode of this cipher.
     *
     * @param mode the cipher mode
     *
     * @exception NoSuchAlgorithmException if the requested cipher mode does
     * not exist
     */
    protected void engineSetMode(String mode)
        throws NoSuchAlgorithmException {
        core.setMode(mode);
    }

    /**
     * Sets the padding mechanism of this cipher.
     *
     * @param padding the padding mechanism
     *
     * @exception NoSuchPaddingException if the requested padding mechanism
     * does not exist
     */
    protected void engineSetPadding(String paddingScheme)
        throws NoSuchPaddingException {
        core.setPadding(paddingScheme);
    }

    /**
     * Returns the block size (in bytes).
     *
     * @return the block size (in bytes), or 0 if the underlying algorithm is
     * not a block cipher
     */
    protected int engineGetBlockSize() {
        return BlowfishConstants.BLOWFISH_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 or
     * <code>doFinal operation, given the input length
     * <code>inputLen (in bytes).
     *
     * <p>This call takes into account any unprocessed (buffered) data from a
     * previous <code>update call, and padding.
     *
     * <p>The actual output length of the next 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)
     */
    protected int engineGetOutputSize(int inputLen) {
        return core.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),
     * 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.
     */
    protected byte[] engineGetIV() {
        return core.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.
     */
    protected AlgorithmParameters engineGetParameters() {
        return core.getParameters("Blowfish");
    }

    /**
     * Initializes this cipher with a key and a source of randomness.
     *
     * <p>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.
     *
     * <p>If this cipher requires an initialization vector (IV), it will get
     * it from <code>random.
     * This behaviour should only be used in encryption or key wrapping
     * mode, however.
     * When initializing a cipher that requires an IV for decryption or
     * key unwrapping, the IV
     * (same IV that was used for encryption or key wrapping) must be provided
     * explicitly as a
     * parameter, in order to get the correct result.
     *
     * <p>This method also cleans existing buffer and other related state
     * information.
     *
     * @param opmode the operation mode of this cipher (this is one of
     * the following:
     * <code>ENCRYPT_MODE, DECRYPT_MODE,
     * <code>WRAP_MODE or UNWRAP_MODE)
     * @param key the secret key
     * @param random the source of randomness
     *
     * @exception InvalidKeyException if the given key is inappropriate for
     * initializing this cipher
     */
    protected void engineInit(int opmode, Key key, SecureRandom random)
        throws InvalidKeyException {
        core.init(opmode, key, random);
    }

    /**
     * Initializes this cipher with a key, a set of
     * algorithm parameters, and a source of randomness.
     *
     * <p>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.
     *
     * <p>If this cipher (including its underlying feedback or padding scheme)
     * requires any random bytes, it will get them from <code>random.
     *
     * @param opmode the operation mode of this cipher (this is one of
     * the following:
     * <code>ENCRYPT_MODE, DECRYPT_MODE,
     * <code>WRAP_MODE or 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
     * @exception InvalidAlgorithmParameterException if the given algorithm
     * parameters are inappropriate for this cipher
     */
    protected void engineInit(int opmode, Key key,
                              AlgorithmParameterSpec params,
                              SecureRandom random)
        throws InvalidKeyException, InvalidAlgorithmParameterException {
        core.init(opmode, key, params, random);
    }

    protected void engineInit(int opmode, Key key,
                              AlgorithmParameters params,
                              SecureRandom random)
        throws InvalidKeyException, InvalidAlgorithmParameterException {
        core.init(opmode, key, params, random);
    }

    /**
     * Continues a multiple-part encryption or decryption operation
     * (depending on how this cipher was initialized), processing another data
     * part.
     *
     * <p>The first inputLen bytes in the input
     * buffer, starting at <code>inputOffset, are processed, and the
     * result is stored in a new buffer.
     *
     * @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)
     */
    protected byte[] engineUpdate(byte[] input, int inputOffset,
                                  int inputLen) {
        return core.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 inputLen bytes in the input
     * buffer, starting at <code>inputOffset, are processed, and the
     * result is stored in the <code>output buffer, starting at
     * <code>outputOffset.
     *
     * @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 ShortBufferException if the given output buffer is too small
     * to hold the result
     */
    protected int engineUpdate(byte[] input, int inputOffset, int inputLen,
                               byte[] output, int outputOffset)
        throws ShortBufferException {
        return core.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 inputLen bytes in the input
     * buffer, starting at <code>inputOffset, and any input bytes that
     * may have been buffered during a previous <code>update 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 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 this cipher is in decryption mode,
     * and (un)padding has been requested, but the decrypted data is not
     * bounded by the appropriate padding bytes
     */
    protected byte[] engineDoFinal(byte[] input, int inputOffset,
                                   int inputLen)
        throws IllegalBlockSizeException, BadPaddingException {
        return core.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 inputLen bytes in the input
     * buffer, starting at <code>inputOffset, and any input bytes that
     * may have been buffered during a previous <code>update operation,
     * are processed, with padding (if requested) being applied.
     * The result is stored in the <code>output buffer, starting at
     * <code>outputOffset.
     *
     * <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 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 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 this cipher is in decryption mode,
     * and (un)padding has been requested, but the decrypted data is not
     * bounded by the appropriate padding bytes
     */
    protected int engineDoFinal(byte[] input, int inputOffset, int inputLen,
                                byte[] output, int outputOffset)
        throws IllegalBlockSizeException, ShortBufferException,
               BadPaddingException {
        return core.doFinal(input, inputOffset, inputLen, output,
                            outputOffset);
    }

    /**
     *  Returns the key size of the given key object.
     *
     * @param key the key object.
     *
     * @return the key size of the given key object.
     *
     * @exception InvalidKeyException if <code>key is invalid.
     */
    protected int engineGetKeySize(Key key) throws InvalidKeyException {
        return (key.getEncoded().length * 8);
    }

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

    /**
     * Unwrap a previously wrapped key.
     *
     * @param wrappedKey the key to be unwrapped.
     *
     * @param wrappedKeyAlgorithm the algorithm the wrapped key is for.
     *
     * @param wrappedKeyType the type of the wrapped key.
     * This is one of <code>Cipher.SECRET_KEY,
     * <code>Cipher.PRIVATE_KEY, or Cipher.PUBLIC_KEY.
     *
     * @return the unwrapped key.
     *
     * @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.
     */
    protected Key engineUnwrap(byte[] wrappedKey,
                                     String wrappedKeyAlgorithm,
                                     int wrappedKeyType)
        throws InvalidKeyException, NoSuchAlgorithmException {
        return core.unwrap(wrappedKey, wrappedKeyAlgorithm,
                           wrappedKeyType);
    }
}