Source Code Cross Referenced for DES_CBC.java in  » 6.0-JDK-Modules » j2me » com » sun » midp » crypto » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.midp.crypto 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *   
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:
027:        package com.sun.midp.crypto;
028:
029:        /**
030:         * DES CBC Cipher algorithm.
031:         */
032:        public class DES_CBC extends DES_ECB {
033:
034:            /** Internal data. */
035:            private byte[] chainingBlock;
036:
037:            /** Internal data. */
038:            private byte[] storeBuffer;
039:
040:            /** Saved state variable. */
041:            private byte[] savedChainingBlock;
042:
043:            /**
044:             * Constructor.
045:             *
046:             * @param useTripleDes true if the class is being used for triple DES
047:             *
048:             */
049:            public DES_CBC(boolean useTripleDes) {
050:                super (useTripleDes);
051:                chainingBlock = new byte[BLOCK_SIZE];
052:                storeBuffer = new byte[BLOCK_SIZE];
053:            }
054:
055:            /**
056:             * Initializes this cipher with a key and a set of algorithm
057:             * parameters.
058:             * @param mode the operation mode of this cipher
059:             * @param key the encryption key
060:             * @param params the algorithm parameters
061:             * @exception java.security.InvalidKeyException if the given key
062:             * is inappropriate for initializing this cipher
063:             * @exception java.security.InvalidAlgorithmParameterException
064:             * if the given algorithm parameters are inappropriate for this cipher
065:             */
066:            public void init(int mode, Key key, CryptoParameter params)
067:                    throws InvalidKeyException,
068:                    InvalidAlgorithmParameterException {
069:
070:                doInit(mode, keyAlgorithm, key, true, params);
071:                System.arraycopy(IV, 0, chainingBlock, 0, BLOCK_SIZE);
072:            }
073:
074:            /**
075:             * Encrypts or decrypts data in a single-part operation, or finishes a
076:             * multiple-part operation. The data is encrypted or decrypted,
077:             * depending on how this cipher was initialized.
078:             *
079:             * @param inBuff the input buffer
080:             * @param inOffset the offset in <code>input</code> where the input
081:             * starts
082:             * @param inLength the input length
083:             * @param outBuff the buffer for the result
084:             * @param outOffset the offset in <code>output</code> where the result
085:             * is stored
086:             *
087:             * @return the number of bytes stored in <code>output</code>
088:             *
089:             * @exception IllegalStateException if this cipher is in a wrong state
090:             * (e.g., has not been initialized)
091:             * @exception javax.crypto.IllegalBlockSizeException if this cipher is
092:             * a block cipher,
093:             * no padding has been requested (only in encryption mode), and the total
094:             * input length of the data processed by this cipher is not a multiple of
095:             * block size
096:             * @exception javax.crypto.ShortBufferException if the given output buffer
097:             * is too small to hold the result
098:             * @exception javax.crypto.BadPaddingException if this cipher is int
099:             * decryption mode,
100:             * and (un)padding has been requested, but the decrypted data is not
101:             * bounded by the appropriate padding bytes
102:             */
103:            public int doFinal(byte inBuff[], int inOffset, int inLength,
104:                    byte outBuff[], int outOffset)
105:                    throws IllegalStateException, IllegalBlockSizeException,
106:                    ShortBufferException, BadPaddingException {
107:                int result = super .doFinal(inBuff, inOffset, inLength, outBuff,
108:                        outOffset);
109:                System.arraycopy(IV, 0, chainingBlock, 0, BLOCK_SIZE);
110:                return result;
111:            }
112:
113:            /**
114:             * Depending on the mode, either encrypts or decrypts data block.
115:             * @param out will contain the result of encryption
116:             * or decryption operation
117:             * @param offset is the offset in out
118:             */
119:            protected void processBlock(byte[] out, int offset) {
120:
121:                if (mode == Cipher.ENCRYPT_MODE) {
122:                    Util.xorArrays(holdData, chainingBlock);
123:                    super .processBlock(out, offset);
124:                    System.arraycopy(out, offset, chainingBlock, 0, BLOCK_SIZE);
125:                } else {
126:                    System.arraycopy(holdData, 0, storeBuffer, 0, BLOCK_SIZE);
127:                    super .processBlock(out, offset);
128:                    for (int i = 0; i < BLOCK_SIZE; i++) {
129:                        out[offset + i] ^= chainingBlock[i];
130:                    }
131:                    System.arraycopy(storeBuffer, 0, chainingBlock, 0,
132:                            BLOCK_SIZE);
133:                }
134:            }
135:
136:            /**
137:             * Saves cipher state.
138:             */
139:            protected void saveState() {
140:                super .saveState();
141:                savedChainingBlock = Util.cloneArray(chainingBlock);
142:            }
143:
144:            /**
145:             * Restores cipher state.
146:             */
147:            protected void restoreState() {
148:                super.restoreState();
149:                chainingBlock = savedChainingBlock;
150:            }
151:        }
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