Source Code Cross Referenced for KeyImpl.java in  » Apache-Harmony-Java-SE » javax-package » javax » security » auth » kerberos » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » javax package » javax.security.auth.kerberos 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Licensed to the Apache Software Foundation (ASF) under one or more
003:         *  contributor license agreements.  See the NOTICE file distributed with
004:         *  this work for additional information regarding copyright ownership.
005:         *  The ASF licenses this file to You under the Apache License, Version 2.0
006:         *  (the "License"); you may not use this file except in compliance with
007:         *  the License.  You may obtain a copy of the License at
008:         *
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         *  Unless required by applicable law or agreed to in writing, software
012:         *  distributed under the License is distributed on an "AS IS" BASIS,
013:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         *  See the License for the specific language governing permissions and
015:         *  limitations under the License.
016:         */
017:
018:        package javax.security.auth.kerberos;
019:
020:        import java.io.IOException;
021:        import java.io.ObjectInputStream;
022:        import java.io.ObjectOutputStream;
023:        import java.io.Serializable;
024:        import java.util.Arrays;
025:
026:        import javax.crypto.Cipher;
027:        import javax.crypto.SecretKey;
028:        import javax.crypto.spec.IvParameterSpec;
029:        import javax.crypto.spec.SecretKeySpec;
030:        import javax.security.auth.DestroyFailedException;
031:        import javax.security.auth.Destroyable;
032:
033:        import org.apache.harmony.auth.internal.kerberos.v5.EncryptionKey;
034:        import org.apache.harmony.auth.internal.nls.Messages;
035:        import org.apache.harmony.security.utils.Array;
036:
037:        /**
038:         * This class encapsulates a Kerberos encryption key.
039:         * 
040:         */
041:        class KeyImpl implements  SecretKey, Destroyable, Serializable {
042:
043:            private static final long serialVersionUID = -7889313790214321193L;
044:
045:            private transient byte[] keyBytes;
046:
047:            private transient int keyType;
048:
049:            //  indicates the ticket state
050:            private transient boolean destroyed;
051:
052:            // Pre-calculated parity values 
053:            // TODO the alternative for boolean table - any acceptable algorithm?
054:            private final static boolean[] PARITY = new boolean[] { false,
055:                    true, true, false, true, false, false, true, true, false,
056:                    false, true, false, true, true, false, true, false, false,
057:                    true, false, true, true, false, false, true, true, false,
058:                    true, false, false, true, true, false, false, true, false,
059:                    true, true, false, false, true, true, false, true, false,
060:                    false, true, false, true, true, false, true, false, false,
061:                    true, true, false, false, true, false, true, true, false,
062:                    true, false, false, true, false, true, true, false, false,
063:                    true, true, false, true, false, false, true, false, true,
064:                    true, false, true, false, false, true, true, false, false,
065:                    true, false, true, true, false, false, true, true, false,
066:                    true, false, false, true, true, false, false, true, false,
067:                    true, true, false, true, false, false, true, false, true,
068:                    true, false, false, true, true, false, true, false, false,
069:                    true, true, false, false, true, false, true, true, false,
070:                    false, true, true, false, true, false, false, true, false,
071:                    true, true, false, true, false, false, true, true, false,
072:                    false, true, false, true, true, false, false, true, true,
073:                    false, true, false, false, true, true, false, false, true,
074:                    false, true, true, false, true, false, false, true, false,
075:                    true, true, false, false, true, true, false, true, false,
076:                    false, true, false, true, true, false, true, false, false,
077:                    true, true, false, false, true, false, true, true, false,
078:                    true, false, false, true, false, true, true, false, false,
079:                    true, true, false, true, false, false, true, true, false,
080:                    false, true, false, true, true, false, false, true, true,
081:                    false, true, false, false, true, false, true, true, false,
082:                    true, false, false, true, true, false, false, true, false,
083:                    true, true, false };
084:
085:            // Pre-calculated reversed values 
086:            // TODO any acceptable alternative algorithm instead of table?
087:            private static final byte[] REVERSE = new byte[] { 0, 64, 32, 96,
088:                    16, 80, 48, 112, 8, 72, 40, 104, 24, 88, 56, 120, 4, 68,
089:                    36, 100, 20, 84, 52, 116, 12, 76, 44, 108, 28, 92, 60, 124,
090:                    2, 66, 34, 98, 18, 82, 50, 114, 10, 74, 42, 106, 26, 90,
091:                    58, 122, 6, 70, 38, 102, 22, 86, 54, 118, 14, 78, 46, 110,
092:                    30, 94, 62, 126, 1, 65, 33, 97, 17, 81, 49, 113, 9, 73, 41,
093:                    105, 25, 89, 57, 121, 5, 69, 37, 101, 21, 85, 53, 117, 13,
094:                    77, 45, 109, 29, 93, 61, 125, 3, 67, 35, 99, 19, 83, 51,
095:                    115, 11, 75, 43, 107, 27, 91, 59, 123, 7, 71, 39, 103, 23,
096:                    87, 55, 119, 15, 79, 47, 111, 31, 95, 63, 127 };
097:
098:            /**
099:             * creates a secret key from a given raw bytes
100:             * 
101:             * @param keyBytes
102:             * @param keyType
103:             */
104:            public KeyImpl(byte[] keyBytes, int keyType) {
105:                this .keyBytes = new byte[keyBytes.length];
106:                System.arraycopy(keyBytes, 0, this .keyBytes, 0,
107:                        this .keyBytes.length);
108:                this .keyType = keyType;
109:            }
110:
111:            /**
112:             * creates a secret key from a given password
113:             * 
114:             * @param principal
115:             * @param password
116:             * @param algorithm
117:             */
118:            public KeyImpl(KerberosPrincipal principal, char[] password,
119:                    String algorithm) {
120:
121:                //
122:                // See http://www.ietf.org/rfc/rfc3961.txt for algorithm description
123:                //
124:
125:                if (principal == null || password == null) {
126:                    throw new NullPointerException();
127:                }
128:
129:                if (algorithm != null && "DES".compareTo(algorithm) != 0) { //$NON-NLS-1$
130:                    throw new IllegalArgumentException(Messages
131:                            .getString("auth.49")); //$NON-NLS-1$
132:                }
133:
134:                keyType = 3; // DES algorithm
135:                keyBytes = new byte[8];
136:
137:                String realm = principal.getRealm();
138:                String pname = principal.getName();
139:
140:                StringBuilder buf = new StringBuilder();
141:                buf.append(password);
142:                buf.append(realm);
143:                buf.append(pname.substring(0, pname.length() - realm.length()
144:                        - 1));
145:
146:                byte[] tmp = buf.toString().getBytes();
147:
148:                // pad with 0x00 to 8 byte boundary
149:                byte[] raw = new byte[tmp.length
150:                        + ((tmp.length % 8) == 0 ? 0 : (8 - tmp.length % 8))];
151:                System.arraycopy(tmp, 0, raw, 0, tmp.length);
152:
153:                long k1, k2 = 0;
154:                boolean isOdd = false;
155:                // for each 8-byte block in raw byte array
156:                for (int i = 0; i < raw.length; i = i + 8, isOdd = !isOdd) {
157:
158:                    k1 = 0;
159:                    if (isOdd) {
160:                        //reverse
161:                        for (int j = 7; j > -1; j--) {
162:                            k1 = (k1 << 7) + REVERSE[raw[i + j] & 0x7F];
163:                        }
164:                    } else {
165:                        for (int j = 0; j < 8; j++) {
166:                            k1 = (k1 << 7) + (raw[i + j] & 0x7F);
167:                        }
168:                    }
169:                    k2 = k2 ^ k1;
170:                }
171:
172:                // 56-bit long to byte array (8 bytes)
173:                for (int i = 7; i > -1; i--) {
174:                    keyBytes[i] = (byte) k2;
175:                    keyBytes[i] = (byte) (keyBytes[i] << 1);
176:                    k2 = k2 >> 7;
177:                }
178:                keyCorrection(keyBytes);
179:
180:                // calculate DES-CBC check sum
181:                try {
182:                    Cipher cipher = Cipher.getInstance("DES/CBC/NoPadding"); //$NON-NLS-1$
183:
184:                    // use tmp key as IV
185:                    IvParameterSpec IV = new IvParameterSpec(keyBytes);
186:
187:                    // do DES encryption 
188:                    SecretKey secretKey = new SecretKeySpec(keyBytes, "DES"); //$NON-NLS-1$
189:                    cipher.init(Cipher.ENCRYPT_MODE, secretKey, IV);
190:                    byte[] enc = cipher.doFinal(raw);
191:
192:                    // final last block is check sum
193:                    System.arraycopy(enc, enc.length - 8, keyBytes, 0, 8);
194:
195:                    keyCorrection(keyBytes);
196:
197:                } catch (Exception e) {
198:                    throw new RuntimeException(Messages.getString("auth.4A"), e); //$NON-NLS-1$
199:                }
200:            }
201:
202:            private void keyCorrection(byte[] key) {
203:
204:                // fix parity
205:                for (int i = 0; i < 8; i++) {
206:                    if (!PARITY[key[i] & 0xFF]) {
207:                        if ((key[i] & 0x01) == 0) {
208:                            key[i]++;
209:                        } else {
210:                            key[i]--;
211:                        }
212:                    }
213:                }
214:
215:                // TODO if is week do XOR
216:                //if(DESKeySpec.isWeak(keyBytes,0)){
217:                //}
218:            }
219:
220:            /**
221:             * Method is described in 
222:             * <code>getAlgorithm</code> in interface <code>Key</code>
223:             */
224:            public final String getAlgorithm() {
225:                checkState();
226:                if (keyType == 0) {
227:                    return "NULL"; //$NON-NLS-1$
228:                }
229:                return "DES"; //$NON-NLS-1$
230:            }
231:
232:            /**
233:             * Method is described in
234:             * <code>getFormat</code> in interface <code>Key</code>
235:             */
236:            public final String getFormat() {
237:                checkState();
238:                return "RAW"; //$NON-NLS-1$
239:            }
240:
241:            /**
242:             * Method is described in
243:             * <code>getEncoded</code> in interface <code>Key</code>
244:             */
245:            public final byte[] getEncoded() {
246:                checkState();
247:                byte[] tmp = new byte[keyBytes.length];
248:                System.arraycopy(keyBytes, 0, tmp, 0, tmp.length);
249:                return tmp;
250:            }
251:
252:            /**
253:             * Returns the key type for this key
254:             */
255:            public final int getKeyType() {
256:                checkState();
257:                return keyType;
258:            }
259:
260:            /**
261:             * Destroys this key
262:             */
263:            public void destroy() throws DestroyFailedException {
264:                if (!destroyed) {
265:                    Arrays.fill(keyBytes, (byte) 0);
266:                    destroyed = true;
267:                }
268:
269:            }
270:
271:            /**
272:             * Determines if this key has been destroyed 
273:             */
274:            public boolean isDestroyed() {
275:                return destroyed;
276:            }
277:
278:            /**
279:             * A string representation of this key
280:             */
281:            @Override
282:            public String toString() {
283:                String s_key = null;
284:                StringBuilder sb = new StringBuilder();
285:
286:                if (keyBytes.length == 0) {
287:                    s_key = "Empty Key"; //$NON-NLS-1$
288:                } else {
289:                    s_key = Array.toString(keyBytes, " "); //$NON-NLS-1$
290:                }
291:                sb
292:                        .append("EncryptionKey: ").append("KeyType = ").append(keyType); //$NON-NLS-1$ //$NON-NLS-2$
293:                sb.append("KeyBytes (Hex dump) = ").append(s_key); //$NON-NLS-1$
294:                return sb.toString();
295:            }
296:
297:            /**
298:             * if a key is destroyed then IllegalStateException should be thrown
299:             */
300:            private void checkState() {
301:                if (destroyed) {
302:                    throw new IllegalStateException(Messages
303:                            .getString("auth.48")); //$NON-NLS-1$
304:                }
305:            }
306:
307:            private void readObject(ObjectInputStream s) throws IOException,
308:                    ClassNotFoundException {
309:
310:                s.defaultReadObject();
311:
312:                EncryptionKey ekey = (EncryptionKey) EncryptionKey.ASN1
313:                        .decode((byte[]) s.readObject());
314:
315:                keyType = ekey.getType();
316:                keyBytes = ekey.getValue();
317:            }
318:
319:            private void writeObject(ObjectOutputStream s) throws IOException {
320:
321:                if (destroyed) {
322:                    throw new IOException(Messages.getString("auth.48")); //$NON-NLS-1$
323:                }
324:                s.defaultWriteObject();
325:
326:                byte[] enc = EncryptionKey.ASN1.encode(new EncryptionKey(
327:                        keyType, keyBytes));
328:                s.writeObject(enc);
329:            }
330:        }
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