Source Code Cross Referenced for MD5.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:         * Implements the MD5 hashing algorithm as described in IETF RFC 1321
031:         * (see http://www.ietf.org/rfc/rfc1321.txt)
032:         */
033:        final class MD5 extends MessageDigest {
034:            /*
035:             * The compute intensive operations are implemented in C
036:             * based on the OpenSSL MD5 code (from pilotSSLeay). Here we
037:             * replicate the state the C code needs.
038:             */
039:
040:            /** State needed for MD5 hash, four elements correspond to A, B, C, D. */
041:            private int[] state = new int[4];
042:            /** State needed for MD5 hash. */
043:            private int[] num = new int[1];
044:            /** Number of bits modulo 2^64 (LSB first) */
045:            private int[] count = new int[2];
046:            /** Input data. */
047:            private int[] data = new int[16];
048:
049:            /** Create an MD5 digest object. */
050:            MD5() {
051:                reset();
052:            }
053:
054:            /** 
055:             * Gets the message digest algorithm.
056:             * @return algorithm implemented by this MessageDigest object
057:             */
058:            public String getAlgorithm() {
059:                return "MD5";
060:            }
061:
062:            /** 
063:             * Gets the length (in bytes) of the hash.
064:             * @return byte-length of the hash produced by this object
065:             */
066:            public int getDigestLength() {
067:                return 16;
068:            }
069:
070:            /** 
071:             * Resets the MessageDigest to the initial state for further use.
072:             */
073:            public void reset() {
074:                count[0] = 0;
075:                count[1] = 0;
076:
077:                // Load magic initialization constants.
078:                state[0] = 0x67452301;
079:                state[1] = 0xefcdab89;
080:                state[2] = 0x98badcfe;
081:                state[3] = 0x10325476;
082:
083:                for (int i = 0; i < 16; i++)
084:                    data[i] = 0;
085:
086:                num[0] = 0;
087:            }
088:
089:            /**
090:             * Accumulates a hash of the input data. Continues an MD5
091:             * message-digest operation, processing another message
092:             * block, and updating the internal context.
093:             * @param inBuf input buffer of data to be hashed
094:             * @param inOff offset within inBuf where input data begins
095:             * @param inLen length (in bytes) of data to be hashed
096:             * @see #doFinal(byte[], int, int, byte[], int)
097:             */
098:            public void update(byte[] inBuf, int inOff, int inLen) {
099:                if (inLen == 0) {
100:                    return;
101:                }
102:
103:                // check parameters to prevent VM from crashing
104:                int test = inBuf[inOff] + inBuf[inLen - 1]
105:                        + inBuf[inOff + inLen - 1];
106:
107:                nativeUpdate(inBuf, inOff, inLen, state, num, count, data);
108:            }
109:
110:            /**
111:             * Accumulates a hash of the input data. Continues an MD5
112:             * message-digest operation, processing another message
113:             * block, and updating the internal context.
114:             * @param inBuf input buffer of data to be hashed
115:             * @param inOff offset within inBuf where input data begins
116:             * @param inLen length (in bytes) of data to be hashed
117:             * @param state internal hash state
118:             * @param num internal hash state
119:             * @param count internal hash state
120:             * @param data internal hash state
121:             */
122:            private static native void nativeUpdate(byte[] inBuf, int inOff,
123:                    int inLen, int[] state, int[] num, int[] count, int[] data);
124:
125:            /**
126:             * Completes the hash computation by performing final operations
127:             * such as padding. The digest is reset after this call is made.
128:             *
129:             * @param buf output buffer for the computed digest
130:             *
131:             * @param offset offset into the output buffer to begin storing the digest
132:             *
133:             * @param len number of bytes within buf allotted for the digest
134:             *
135:             * @return the number of bytes placed into <code>buf</code>
136:             * 
137:             * @exception DigestException if an error occurs.
138:             */
139:            public int digest(byte[] buf, int offset, int len)
140:                    throws DigestException {
141:                if (len < getDigestLength()) {
142:                    throw new DigestException("Buffer too short.");
143:                }
144:
145:                // check the parameters to prevent a VM crash
146:                int test = buf[offset] + buf[offset + getDigestLength() - 1];
147:
148:                nativeFinal(null, 0, 0, buf, offset, state, num, count, data);
149:                return getDigestLength();
150:            }
151:
152:            /** 
153:             * Generates a hash of all/last input data. Completes and returns the
154:             * hash compuatation after performing final operations such as padding.
155:             * The MessageDigest object is reset after this call. 
156:             * @param inBuf input buffer of data to be hashed
157:             * @param inOff offset within inBuf where input data begins
158:             * @param inLen length (in bytes) of data to be hashed
159:             * @param outBuf output buffer where the hash should be placed
160:             * @param outOff offset within outBuf where the resulting hash begins
161:             * @param state internal hash state
162:             * @param num internal hash state
163:             * @param count internal hash state
164:             * @param data internal hash state
165:             */
166:            private static native void nativeFinal(byte[] inBuf, int inOff,
167:                    int inLen, byte[] outBuf, int outOff, int[] state,
168:                    int[] num, int[] count, int[] data);
169:
170:            /** 
171:             * Clones the MessageDigest object.
172:             * @return a clone of this object
173:             */
174:            public Object clone() {
175:                MD5 cpy = new MD5();
176:
177:                System.arraycopy(this .state, 0, cpy.state, 0, 4);
178:                System.arraycopy(this .num, 0, cpy.num, 0, 1);
179:                System.arraycopy(this .data, 0, cpy.data, 0, 16);
180:                System.arraycopy(this .count, 0, cpy.count, 0, 2);
181:                return cpy;
182:            }
183:        }
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