Source Code Cross Referenced for DES.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:         * Wrapper for all DES cipher classes.
031:         */
032:        public class DES extends Cipher {
033:            Cipher cipher;
034:
035:            /**
036:             * Public by name constructor.
037:             */
038:            public DES() {
039:            }
040:
041:            /**
042:             * Called by the factory method to set the mode and padding parameters.
043:             * Need because Class.newInstance does not take args.
044:             *
045:             * @param mode the mode parsed from the transformation parameter of
046:             *             getInstance
047:             * @param padding the paddinge parsed from the transformation parameter of
048:             *                getInstance
049:             *
050:             * @exception NoSuchPaddingException if <code>transformation</code>
051:             * contains a padding scheme that is not available.
052:             */
053:            protected void setChainingModeAndPadding(String mode, String padding)
054:                    throws NoSuchPaddingException {
055:                if (mode.equals("ECB") || mode.equals("")) {
056:                    cipher = new DES_ECB(false);
057:                } else if (mode.equals("CBC")) {
058:                    cipher = new DES_CBC(false);
059:                } else {
060:                    throw new IllegalArgumentException();
061:                }
062:
063:                cipher.setChainingModeAndPadding(mode, padding);
064:            }
065:
066:            /**
067:             * Initializes this cipher with a key and a set of algorithm
068:             * parameters.
069:             *
070:             * <p>The cipher is initialized for one of the following  operations:
071:             * encryption or decryption depending
072:             * on the value of <code>opmode</code>.
073:             *
074:             * <p>If this cipher requires any algorithm parameters and
075:             * <code>params</code> is null, the underlying cipher implementation is
076:             * supposed to generate the required parameters itself (using
077:             * provider-specific default or random values) if it is being
078:             * initialized for encryption, and raise an
079:             * <code>InvalidAlgorithmParameterException</code> if it is being
080:             * initialized for decryption.
081:             *
082:             * <p>Note that when a Cipher object is initialized, it loses all
083:             * previously-acquired state. In other words, initializing a Cipher is
084:             * equivalent to creating a new instance of that Cipher and initializing
085:             * it.
086:             *
087:             * @param opmode the operation mode of this cipher (this is one of the
088:             * following:
089:             * <code>ENCRYPT_MODE</code> or <code>DECRYPT_MODE</code>)
090:             * @param key the encryption key
091:             * @param params the algorithm parameters
092:             *
093:             * @exception InvalidKeyException if the given key is inappropriate for
094:             * initializing this cipher, or its keysize exceeds the maximum allowable
095:             * keysize.
096:             * @exception InvalidAlgorithmParameterException if the given algorithm
097:             * parameters are inappropriate for this cipher,
098:             * or this cipher is being initialized for decryption and requires
099:             * algorithm parameters and <code>params</code> is null, or the given
100:             * algorithm parameters imply a cryptographic strength that would exceed
101:             * the legal limits.
102:             */
103:            public void init(int opmode, Key key, CryptoParameter params)
104:                    throws InvalidKeyException,
105:                    InvalidAlgorithmParameterException {
106:                cipher.init(opmode, key, params);
107:            }
108:
109:            /**
110:             * Continues a multiple-part encryption or decryption operation
111:             * (depending on how this cipher was initialized), processing another data
112:             * part.
113:             *
114:             * <p>The first <code>inputLen</code> bytes in the <code>input</code>
115:             * buffer, starting at <code>inputOffset</code> inclusive, are processed,
116:             * and the result is stored in the <code>output</code> buffer, starting at
117:             * <code>outputOffset</code> inclusive.
118:             *
119:             * <p>If the <code>output</code> buffer is too small to hold the result,
120:             * a <code>ShortBufferException</code> is thrown. In this case, repeat this
121:             * call with a larger output buffer.
122:             *
123:             * <p>If <code>inputLen</code> is zero, this method returns
124:             * a length of zero.
125:             *
126:             * <p>Note: this method should be copy-safe, which means the
127:             * <code>input</code> and <code>output</code> buffers can reference
128:             * the same byte array and no unprocessed input data is overwritten
129:             * when the result is copied into the output buffer.
130:             *
131:             * @param input the input buffer
132:             * @param inputOffset the offset in <code>input</code> where the input
133:             * starts
134:             * @param inputLen the input length
135:             * @param output the buffer for the result
136:             * @param outputOffset the offset in <code>output</code> where the result
137:             * is stored
138:             *
139:             * @return the number of bytes stored in <code>output</code>
140:             *
141:             * @exception IllegalStateException if this cipher is in a wrong state
142:             * (e.g., has not been initialized)
143:             * @exception ShortBufferException if the given output buffer is too small
144:             * to hold the result
145:             */
146:            public int update(byte[] input, int inputOffset, int inputLen,
147:                    byte[] output, int outputOffset)
148:                    throws IllegalStateException, ShortBufferException {
149:                return cipher.update(input, inputOffset, inputLen, output,
150:                        outputOffset);
151:            }
152:
153:            /**
154:             * Encrypts or decrypts data in a single-part operation, or finishes a
155:             * multiple-part operation. The data is encrypted or decrypted,
156:             * depending on how this cipher was initialized.
157:             *
158:             * <p>The first <code>inputLen</code> bytes in the <code>input</code>
159:             * buffer, starting at <code>inputOffset</code> inclusive, and any input
160:             * bytes that may have been buffered during a previous
161:             * <code>update</code> operation, are processed, with padding
162:             * (if requested) being applied.
163:             * The result is stored in the <code>output</code> buffer, starting at
164:             * <code>outputOffset</code> inclusive.
165:             *
166:             * <p>If the <code>output</code> buffer is too small to hold the result,
167:             * a <code>ShortBufferException</code> is thrown. In this case, repeat this
168:             * call with a larger output buffer.
169:             *
170:             * <p>Upon finishing, this method resets this cipher object to the state
171:             * it was in when previously initialized via a call to <code>init</code>.
172:             * That is, the object is reset and available to encrypt or decrypt
173:             * (depending on the operation mode that was specified in the call to
174:             * <code>init</code>) more data.
175:             *
176:             * <p>Note: if any exception is thrown, this cipher object may need to
177:             * be reset before it can be used again.
178:             *
179:             * <p>Note: this method should be copy-safe, which means the
180:             * <code>input</code> and <code>output</code> buffers can reference
181:             * the same byte array and no unprocessed input data is overwritten
182:             * when the result is copied into the output buffer.
183:             *
184:             * @param input the input buffer
185:             * @param inputOffset the offset in <code>input</code> where the input
186:             * starts
187:             * @param inputLen the input length
188:             * @param output the buffer for the result
189:             * @param outputOffset the offset in <code>output</code> where the result
190:             * is stored
191:             *
192:             * @return the number of bytes stored in <code>output</code>
193:             *
194:             * @exception IllegalStateException if this cipher is in a wrong state
195:             * (e.g., has not been initialized)
196:             * @exception IllegalBlockSizeException if this cipher is a block cipher,
197:             * no padding has been requested (only in encryption mode), and the total
198:             * input length of the data processed by this cipher is not a multiple of
199:             * block size
200:             * @exception ShortBufferException if the given output buffer is too small
201:             * to hold the result
202:             * @exception BadPaddingException if this cipher is in decryption mode,
203:             * and (un)padding has been requested, but the decrypted data is not
204:             * bounded by the appropriate padding bytes
205:             */
206:            public int doFinal(byte[] input, int inputOffset, int inputLen,
207:                    byte[] output, int outputOffset)
208:                    throws IllegalStateException, ShortBufferException,
209:                    IllegalBlockSizeException, BadPaddingException {
210:                return cipher.doFinal(input, inputOffset, inputLen, output,
211:                        outputOffset);
212:            }
213:
214:            /**
215:             * Returns the initialization vector (IV) in a new buffer.
216:             * This is useful in the case where a random IV was created.
217:             * @return the initialization vector in a new buffer,
218:             * or <code>null</code> if the underlying algorithm does
219:             * not use an IV, or if the IV has not yet been set.
220:             */
221:            public byte[] getIV() {
222:                return cipher.getIV();
223:            }
224:        }
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