Source Code Cross Referenced for MD5Digest.java in  » Database-JDBC-Connection-Pool » jTDS » net » sourceforge » jtds » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database JDBC Connection Pool » jTDS » net.sourceforge.jtds.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /******************************************************************************
002:         * Copyright (c) 2000 The Legion Of The Bouncy Castle (http://www.bouncycastle.org)
003:         * Permission is hereby granted, free of charge, to any person obtaining a
004:         * copy of this software and associated documentation files (the "Software"),
005:         * to deal in the Software without restriction, including without limitation
006:         * the rights to use, copy, modify, merge, publish, distribute, sublicense,
007:         * and/or sell copies of the Software, and to permit persons to whom the
008:         * Software is furnished to do so, subject to the following conditions:
009:         *
010:         * The above copyright notice and this permission notice shall be included
011:         * in all copies or substantial portions of the Software.
012:         *
013:         * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
014:         * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
015:         * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
016:         * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
017:         * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
018:         * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
019:         * USE OR OTHER DEALINGS IN THE SOFTWARE.
020:         ******************************************************************************/package net.sourceforge.jtds.util;
021:
022:        /**
023:         * implementation of MD5 as outlined in "Handbook of Applied Cryptography", pages 346 - 347.
024:         */
025:        public class MD5Digest extends GeneralDigest {
026:            private static final int DIGEST_LENGTH = 16;
027:
028:            private int H1, H2, H3, H4; // IV's
029:
030:            private int[] X = new int[16];
031:            private int xOff;
032:
033:            /**
034:             * Standard constructor
035:             */
036:            public MD5Digest() {
037:                reset();
038:            }
039:
040:            /**
041:             * Copy constructor.  This will copy the state of the provided
042:             * message digest.
043:             */
044:            public MD5Digest(MD5Digest t) {
045:                super (t);
046:
047:                H1 = t.H1;
048:                H2 = t.H2;
049:                H3 = t.H3;
050:                H4 = t.H4;
051:
052:                System.arraycopy(t.X, 0, X, 0, t.X.length);
053:                xOff = t.xOff;
054:            }
055:
056:            public String getAlgorithmName() {
057:                return "MD5";
058:            }
059:
060:            public int getDigestSize() {
061:                return DIGEST_LENGTH;
062:            }
063:
064:            protected void processWord(byte[] in, int inOff) {
065:                X[xOff++] = (in[inOff] & 0xff) | ((in[inOff + 1] & 0xff) << 8)
066:                        | ((in[inOff + 2] & 0xff) << 16)
067:                        | ((in[inOff + 3] & 0xff) << 24);
068:
069:                if (xOff == 16) {
070:                    processBlock();
071:                }
072:            }
073:
074:            protected void processLength(long bitLength) {
075:                if (xOff > 14) {
076:                    processBlock();
077:                }
078:
079:                X[14] = (int) (bitLength & 0xffffffff);
080:                X[15] = (int) (bitLength >>> 32);
081:            }
082:
083:            private void unpackWord(int word, byte[] out, int outOff) {
084:                out[outOff] = (byte) word;
085:                out[outOff + 1] = (byte) (word >>> 8);
086:                out[outOff + 2] = (byte) (word >>> 16);
087:                out[outOff + 3] = (byte) (word >>> 24);
088:            }
089:
090:            public int doFinal(byte[] out, int outOff) {
091:                finish();
092:
093:                unpackWord(H1, out, outOff);
094:                unpackWord(H2, out, outOff + 4);
095:                unpackWord(H3, out, outOff + 8);
096:                unpackWord(H4, out, outOff + 12);
097:
098:                reset();
099:
100:                return DIGEST_LENGTH;
101:            }
102:
103:            /**
104:             * reset the chaining variables to the IV values.
105:             */
106:            public void reset() {
107:                super .reset();
108:
109:                H1 = 0x67452301;
110:                H2 = 0xefcdab89;
111:                H3 = 0x98badcfe;
112:                H4 = 0x10325476;
113:
114:                xOff = 0;
115:
116:                for (int i = 0; i != X.length; i++) {
117:                    X[i] = 0;
118:                }
119:            }
120:
121:            //
122:            // round 1 left rotates
123:            //
124:            private static final int S11 = 7;
125:            private static final int S12 = 12;
126:            private static final int S13 = 17;
127:            private static final int S14 = 22;
128:
129:            //
130:            // round 2 left rotates
131:            //
132:            private static final int S21 = 5;
133:            private static final int S22 = 9;
134:            private static final int S23 = 14;
135:            private static final int S24 = 20;
136:
137:            //
138:            // round 3 left rotates
139:            //
140:            private static final int S31 = 4;
141:            private static final int S32 = 11;
142:            private static final int S33 = 16;
143:            private static final int S34 = 23;
144:
145:            //
146:            // round 4 left rotates
147:            //
148:            private static final int S41 = 6;
149:            private static final int S42 = 10;
150:            private static final int S43 = 15;
151:            private static final int S44 = 21;
152:
153:            /*
154:             * rotate int x left n bits.
155:             */
156:            private int rotateLeft(int x, int n) {
157:                return (x << n) | (x >>> (32 - n));
158:            }
159:
160:            /*
161:             * F, G, H and I are the basic MD5 functions.
162:             */
163:            private int F(int u, int v, int w) {
164:                return (u & v) | (~u & w);
165:            }
166:
167:            private int G(int u, int v, int w) {
168:                return (u & w) | (v & ~w);
169:            }
170:
171:            private int H(int u, int v, int w) {
172:                return u ^ v ^ w;
173:            }
174:
175:            private int K(int u, int v, int w) {
176:                return v ^ (u | ~w);
177:            }
178:
179:            protected void processBlock() {
180:                int a = H1;
181:                int b = H2;
182:                int c = H3;
183:                int d = H4;
184:
185:                //
186:                // Round 1 - F cycle, 16 times.
187:                //
188:                a = rotateLeft(a + F(b, c, d) + X[0] + 0xd76aa478, S11) + b;
189:                d = rotateLeft(d + F(a, b, c) + X[1] + 0xe8c7b756, S12) + a;
190:                c = rotateLeft(c + F(d, a, b) + X[2] + 0x242070db, S13) + d;
191:                b = rotateLeft(b + F(c, d, a) + X[3] + 0xc1bdceee, S14) + c;
192:                a = rotateLeft(a + F(b, c, d) + X[4] + 0xf57c0faf, S11) + b;
193:                d = rotateLeft(d + F(a, b, c) + X[5] + 0x4787c62a, S12) + a;
194:                c = rotateLeft(c + F(d, a, b) + X[6] + 0xa8304613, S13) + d;
195:                b = rotateLeft(b + F(c, d, a) + X[7] + 0xfd469501, S14) + c;
196:                a = rotateLeft(a + F(b, c, d) + X[8] + 0x698098d8, S11) + b;
197:                d = rotateLeft(d + F(a, b, c) + X[9] + 0x8b44f7af, S12) + a;
198:                c = rotateLeft(c + F(d, a, b) + X[10] + 0xffff5bb1, S13) + d;
199:                b = rotateLeft(b + F(c, d, a) + X[11] + 0x895cd7be, S14) + c;
200:                a = rotateLeft(a + F(b, c, d) + X[12] + 0x6b901122, S11) + b;
201:                d = rotateLeft(d + F(a, b, c) + X[13] + 0xfd987193, S12) + a;
202:                c = rotateLeft(c + F(d, a, b) + X[14] + 0xa679438e, S13) + d;
203:                b = rotateLeft(b + F(c, d, a) + X[15] + 0x49b40821, S14) + c;
204:
205:                //
206:                // Round 2 - G cycle, 16 times.
207:                //
208:                a = rotateLeft(a + G(b, c, d) + X[1] + 0xf61e2562, S21) + b;
209:                d = rotateLeft(d + G(a, b, c) + X[6] + 0xc040b340, S22) + a;
210:                c = rotateLeft(c + G(d, a, b) + X[11] + 0x265e5a51, S23) + d;
211:                b = rotateLeft(b + G(c, d, a) + X[0] + 0xe9b6c7aa, S24) + c;
212:                a = rotateLeft(a + G(b, c, d) + X[5] + 0xd62f105d, S21) + b;
213:                d = rotateLeft(d + G(a, b, c) + X[10] + 0x02441453, S22) + a;
214:                c = rotateLeft(c + G(d, a, b) + X[15] + 0xd8a1e681, S23) + d;
215:                b = rotateLeft(b + G(c, d, a) + X[4] + 0xe7d3fbc8, S24) + c;
216:                a = rotateLeft(a + G(b, c, d) + X[9] + 0x21e1cde6, S21) + b;
217:                d = rotateLeft(d + G(a, b, c) + X[14] + 0xc33707d6, S22) + a;
218:                c = rotateLeft(c + G(d, a, b) + X[3] + 0xf4d50d87, S23) + d;
219:                b = rotateLeft(b + G(c, d, a) + X[8] + 0x455a14ed, S24) + c;
220:                a = rotateLeft(a + G(b, c, d) + X[13] + 0xa9e3e905, S21) + b;
221:                d = rotateLeft(d + G(a, b, c) + X[2] + 0xfcefa3f8, S22) + a;
222:                c = rotateLeft(c + G(d, a, b) + X[7] + 0x676f02d9, S23) + d;
223:                b = rotateLeft(b + G(c, d, a) + X[12] + 0x8d2a4c8a, S24) + c;
224:
225:                //
226:                // Round 3 - H cycle, 16 times.
227:                //
228:                a = rotateLeft(a + H(b, c, d) + X[5] + 0xfffa3942, S31) + b;
229:                d = rotateLeft(d + H(a, b, c) + X[8] + 0x8771f681, S32) + a;
230:                c = rotateLeft(c + H(d, a, b) + X[11] + 0x6d9d6122, S33) + d;
231:                b = rotateLeft(b + H(c, d, a) + X[14] + 0xfde5380c, S34) + c;
232:                a = rotateLeft(a + H(b, c, d) + X[1] + 0xa4beea44, S31) + b;
233:                d = rotateLeft(d + H(a, b, c) + X[4] + 0x4bdecfa9, S32) + a;
234:                c = rotateLeft(c + H(d, a, b) + X[7] + 0xf6bb4b60, S33) + d;
235:                b = rotateLeft(b + H(c, d, a) + X[10] + 0xbebfbc70, S34) + c;
236:                a = rotateLeft(a + H(b, c, d) + X[13] + 0x289b7ec6, S31) + b;
237:                d = rotateLeft(d + H(a, b, c) + X[0] + 0xeaa127fa, S32) + a;
238:                c = rotateLeft(c + H(d, a, b) + X[3] + 0xd4ef3085, S33) + d;
239:                b = rotateLeft(b + H(c, d, a) + X[6] + 0x04881d05, S34) + c;
240:                a = rotateLeft(a + H(b, c, d) + X[9] + 0xd9d4d039, S31) + b;
241:                d = rotateLeft(d + H(a, b, c) + X[12] + 0xe6db99e5, S32) + a;
242:                c = rotateLeft(c + H(d, a, b) + X[15] + 0x1fa27cf8, S33) + d;
243:                b = rotateLeft(b + H(c, d, a) + X[2] + 0xc4ac5665, S34) + c;
244:
245:                //
246:                // Round 4 - K cycle, 16 times.
247:                //
248:                a = rotateLeft(a + K(b, c, d) + X[0] + 0xf4292244, S41) + b;
249:                d = rotateLeft(d + K(a, b, c) + X[7] + 0x432aff97, S42) + a;
250:                c = rotateLeft(c + K(d, a, b) + X[14] + 0xab9423a7, S43) + d;
251:                b = rotateLeft(b + K(c, d, a) + X[5] + 0xfc93a039, S44) + c;
252:                a = rotateLeft(a + K(b, c, d) + X[12] + 0x655b59c3, S41) + b;
253:                d = rotateLeft(d + K(a, b, c) + X[3] + 0x8f0ccc92, S42) + a;
254:                c = rotateLeft(c + K(d, a, b) + X[10] + 0xffeff47d, S43) + d;
255:                b = rotateLeft(b + K(c, d, a) + X[1] + 0x85845dd1, S44) + c;
256:                a = rotateLeft(a + K(b, c, d) + X[8] + 0x6fa87e4f, S41) + b;
257:                d = rotateLeft(d + K(a, b, c) + X[15] + 0xfe2ce6e0, S42) + a;
258:                c = rotateLeft(c + K(d, a, b) + X[6] + 0xa3014314, S43) + d;
259:                b = rotateLeft(b + K(c, d, a) + X[13] + 0x4e0811a1, S44) + c;
260:                a = rotateLeft(a + K(b, c, d) + X[4] + 0xf7537e82, S41) + b;
261:                d = rotateLeft(d + K(a, b, c) + X[11] + 0xbd3af235, S42) + a;
262:                c = rotateLeft(c + K(d, a, b) + X[2] + 0x2ad7d2bb, S43) + d;
263:                b = rotateLeft(b + K(c, d, a) + X[9] + 0xeb86d391, S44) + c;
264:
265:                H1 += a;
266:                H2 += b;
267:                H3 += c;
268:                H4 += d;
269:
270:                //
271:                // reset the offset and clean out the word buffer.
272:                //
273:                xOff = 0;
274:                for (int i = 0; i != X.length; i++) {
275:                    X[i] = 0;
276:                }
277:            }
278:        }
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