Source Code Cross Referenced for RIPEMD256Digest.java in  » Security » Bouncy-Castle » org » bouncycastle » crypto » digests » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Security » Bouncy Castle » org.bouncycastle.crypto.digests 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.bouncycastle.crypto.digests;
002:
003:        /**
004:         * implementation of RIPEMD256.
005:         * <p>
006:         * <b>note:</b> this algorithm offers the same level of security as RIPEMD128.
007:         */
008:        public class RIPEMD256Digest extends GeneralDigest {
009:            private static final int DIGEST_LENGTH = 32;
010:
011:            private int H0, H1, H2, H3, H4, H5, H6, H7; // IV's
012:
013:            private int[] X = new int[16];
014:            private int xOff;
015:
016:            /**
017:             * Standard constructor
018:             */
019:            public RIPEMD256Digest() {
020:                reset();
021:            }
022:
023:            /**
024:             * Copy constructor.  This will copy the state of the provided
025:             * message digest.
026:             */
027:            public RIPEMD256Digest(RIPEMD256Digest t) {
028:                super (t);
029:
030:                H0 = t.H0;
031:                H1 = t.H1;
032:                H2 = t.H2;
033:                H3 = t.H3;
034:                H4 = t.H4;
035:                H5 = t.H5;
036:                H6 = t.H6;
037:                H7 = t.H7;
038:
039:                System.arraycopy(t.X, 0, X, 0, t.X.length);
040:                xOff = t.xOff;
041:            }
042:
043:            public String getAlgorithmName() {
044:                return "RIPEMD256";
045:            }
046:
047:            public int getDigestSize() {
048:                return DIGEST_LENGTH;
049:            }
050:
051:            protected void processWord(byte[] in, int inOff) {
052:                X[xOff++] = (in[inOff] & 0xff) | ((in[inOff + 1] & 0xff) << 8)
053:                        | ((in[inOff + 2] & 0xff) << 16)
054:                        | ((in[inOff + 3] & 0xff) << 24);
055:
056:                if (xOff == 16) {
057:                    processBlock();
058:                }
059:            }
060:
061:            protected void processLength(long bitLength) {
062:                if (xOff > 14) {
063:                    processBlock();
064:                }
065:
066:                X[14] = (int) (bitLength & 0xffffffff);
067:                X[15] = (int) (bitLength >>> 32);
068:            }
069:
070:            private void unpackWord(int word, byte[] out, int outOff) {
071:                out[outOff] = (byte) word;
072:                out[outOff + 1] = (byte) (word >>> 8);
073:                out[outOff + 2] = (byte) (word >>> 16);
074:                out[outOff + 3] = (byte) (word >>> 24);
075:            }
076:
077:            public int doFinal(byte[] out, int outOff) {
078:                finish();
079:
080:                unpackWord(H0, out, outOff);
081:                unpackWord(H1, out, outOff + 4);
082:                unpackWord(H2, out, outOff + 8);
083:                unpackWord(H3, out, outOff + 12);
084:                unpackWord(H4, out, outOff + 16);
085:                unpackWord(H5, out, outOff + 20);
086:                unpackWord(H6, out, outOff + 24);
087:                unpackWord(H7, out, outOff + 28);
088:
089:                reset();
090:
091:                return DIGEST_LENGTH;
092:            }
093:
094:            /**
095:             * reset the chaining variables to the IV values.
096:             */
097:            public void reset() {
098:                super .reset();
099:
100:                H0 = 0x67452301;
101:                H1 = 0xefcdab89;
102:                H2 = 0x98badcfe;
103:                H3 = 0x10325476;
104:                H4 = 0x76543210;
105:                H5 = 0xFEDCBA98;
106:                H6 = 0x89ABCDEF;
107:                H7 = 0x01234567;
108:
109:                xOff = 0;
110:
111:                for (int i = 0; i != X.length; i++) {
112:                    X[i] = 0;
113:                }
114:            }
115:
116:            /*
117:             * rotate int x left n bits.
118:             */
119:            private final int RL(int x, int n) {
120:                return (x << n) | (x >>> (32 - n));
121:            }
122:
123:            /*
124:             * f1,f2,f3,f4 are the basic RIPEMD128 functions.
125:             */
126:
127:            /*
128:             * F
129:             */
130:            private final int f1(int x, int y, int z) {
131:                return x ^ y ^ z;
132:            }
133:
134:            /*
135:             * G
136:             */
137:            private final int f2(int x, int y, int z) {
138:                return (x & y) | (~x & z);
139:            }
140:
141:            /*
142:             * H
143:             */
144:            private final int f3(int x, int y, int z) {
145:                return (x | ~y) ^ z;
146:            }
147:
148:            /*
149:             * I
150:             */
151:            private final int f4(int x, int y, int z) {
152:                return (x & z) | (y & ~z);
153:            }
154:
155:            private final int F1(int a, int b, int c, int d, int x, int s) {
156:                return RL(a + f1(b, c, d) + x, s);
157:            }
158:
159:            private final int F2(int a, int b, int c, int d, int x, int s) {
160:                return RL(a + f2(b, c, d) + x + 0x5a827999, s);
161:            }
162:
163:            private final int F3(int a, int b, int c, int d, int x, int s) {
164:                return RL(a + f3(b, c, d) + x + 0x6ed9eba1, s);
165:            }
166:
167:            private final int F4(int a, int b, int c, int d, int x, int s) {
168:                return RL(a + f4(b, c, d) + x + 0x8f1bbcdc, s);
169:            }
170:
171:            private final int FF1(int a, int b, int c, int d, int x, int s) {
172:                return RL(a + f1(b, c, d) + x, s);
173:            }
174:
175:            private final int FF2(int a, int b, int c, int d, int x, int s) {
176:                return RL(a + f2(b, c, d) + x + 0x6d703ef3, s);
177:            }
178:
179:            private final int FF3(int a, int b, int c, int d, int x, int s) {
180:                return RL(a + f3(b, c, d) + x + 0x5c4dd124, s);
181:            }
182:
183:            private final int FF4(int a, int b, int c, int d, int x, int s) {
184:                return RL(a + f4(b, c, d) + x + 0x50a28be6, s);
185:            }
186:
187:            protected void processBlock() {
188:                int a, aa;
189:                int b, bb;
190:                int c, cc;
191:                int d, dd;
192:                int t;
193:
194:                a = H0;
195:                b = H1;
196:                c = H2;
197:                d = H3;
198:                aa = H4;
199:                bb = H5;
200:                cc = H6;
201:                dd = H7;
202:
203:                //
204:                // Round 1
205:                //
206:
207:                a = F1(a, b, c, d, X[0], 11);
208:                d = F1(d, a, b, c, X[1], 14);
209:                c = F1(c, d, a, b, X[2], 15);
210:                b = F1(b, c, d, a, X[3], 12);
211:                a = F1(a, b, c, d, X[4], 5);
212:                d = F1(d, a, b, c, X[5], 8);
213:                c = F1(c, d, a, b, X[6], 7);
214:                b = F1(b, c, d, a, X[7], 9);
215:                a = F1(a, b, c, d, X[8], 11);
216:                d = F1(d, a, b, c, X[9], 13);
217:                c = F1(c, d, a, b, X[10], 14);
218:                b = F1(b, c, d, a, X[11], 15);
219:                a = F1(a, b, c, d, X[12], 6);
220:                d = F1(d, a, b, c, X[13], 7);
221:                c = F1(c, d, a, b, X[14], 9);
222:                b = F1(b, c, d, a, X[15], 8);
223:
224:                aa = FF4(aa, bb, cc, dd, X[5], 8);
225:                dd = FF4(dd, aa, bb, cc, X[14], 9);
226:                cc = FF4(cc, dd, aa, bb, X[7], 9);
227:                bb = FF4(bb, cc, dd, aa, X[0], 11);
228:                aa = FF4(aa, bb, cc, dd, X[9], 13);
229:                dd = FF4(dd, aa, bb, cc, X[2], 15);
230:                cc = FF4(cc, dd, aa, bb, X[11], 15);
231:                bb = FF4(bb, cc, dd, aa, X[4], 5);
232:                aa = FF4(aa, bb, cc, dd, X[13], 7);
233:                dd = FF4(dd, aa, bb, cc, X[6], 7);
234:                cc = FF4(cc, dd, aa, bb, X[15], 8);
235:                bb = FF4(bb, cc, dd, aa, X[8], 11);
236:                aa = FF4(aa, bb, cc, dd, X[1], 14);
237:                dd = FF4(dd, aa, bb, cc, X[10], 14);
238:                cc = FF4(cc, dd, aa, bb, X[3], 12);
239:                bb = FF4(bb, cc, dd, aa, X[12], 6);
240:
241:                t = a;
242:                a = aa;
243:                aa = t;
244:
245:                //
246:                // Round 2
247:                //
248:                a = F2(a, b, c, d, X[7], 7);
249:                d = F2(d, a, b, c, X[4], 6);
250:                c = F2(c, d, a, b, X[13], 8);
251:                b = F2(b, c, d, a, X[1], 13);
252:                a = F2(a, b, c, d, X[10], 11);
253:                d = F2(d, a, b, c, X[6], 9);
254:                c = F2(c, d, a, b, X[15], 7);
255:                b = F2(b, c, d, a, X[3], 15);
256:                a = F2(a, b, c, d, X[12], 7);
257:                d = F2(d, a, b, c, X[0], 12);
258:                c = F2(c, d, a, b, X[9], 15);
259:                b = F2(b, c, d, a, X[5], 9);
260:                a = F2(a, b, c, d, X[2], 11);
261:                d = F2(d, a, b, c, X[14], 7);
262:                c = F2(c, d, a, b, X[11], 13);
263:                b = F2(b, c, d, a, X[8], 12);
264:
265:                aa = FF3(aa, bb, cc, dd, X[6], 9);
266:                dd = FF3(dd, aa, bb, cc, X[11], 13);
267:                cc = FF3(cc, dd, aa, bb, X[3], 15);
268:                bb = FF3(bb, cc, dd, aa, X[7], 7);
269:                aa = FF3(aa, bb, cc, dd, X[0], 12);
270:                dd = FF3(dd, aa, bb, cc, X[13], 8);
271:                cc = FF3(cc, dd, aa, bb, X[5], 9);
272:                bb = FF3(bb, cc, dd, aa, X[10], 11);
273:                aa = FF3(aa, bb, cc, dd, X[14], 7);
274:                dd = FF3(dd, aa, bb, cc, X[15], 7);
275:                cc = FF3(cc, dd, aa, bb, X[8], 12);
276:                bb = FF3(bb, cc, dd, aa, X[12], 7);
277:                aa = FF3(aa, bb, cc, dd, X[4], 6);
278:                dd = FF3(dd, aa, bb, cc, X[9], 15);
279:                cc = FF3(cc, dd, aa, bb, X[1], 13);
280:                bb = FF3(bb, cc, dd, aa, X[2], 11);
281:
282:                t = b;
283:                b = bb;
284:                bb = t;
285:
286:                //
287:                // Round 3
288:                //
289:                a = F3(a, b, c, d, X[3], 11);
290:                d = F3(d, a, b, c, X[10], 13);
291:                c = F3(c, d, a, b, X[14], 6);
292:                b = F3(b, c, d, a, X[4], 7);
293:                a = F3(a, b, c, d, X[9], 14);
294:                d = F3(d, a, b, c, X[15], 9);
295:                c = F3(c, d, a, b, X[8], 13);
296:                b = F3(b, c, d, a, X[1], 15);
297:                a = F3(a, b, c, d, X[2], 14);
298:                d = F3(d, a, b, c, X[7], 8);
299:                c = F3(c, d, a, b, X[0], 13);
300:                b = F3(b, c, d, a, X[6], 6);
301:                a = F3(a, b, c, d, X[13], 5);
302:                d = F3(d, a, b, c, X[11], 12);
303:                c = F3(c, d, a, b, X[5], 7);
304:                b = F3(b, c, d, a, X[12], 5);
305:
306:                aa = FF2(aa, bb, cc, dd, X[15], 9);
307:                dd = FF2(dd, aa, bb, cc, X[5], 7);
308:                cc = FF2(cc, dd, aa, bb, X[1], 15);
309:                bb = FF2(bb, cc, dd, aa, X[3], 11);
310:                aa = FF2(aa, bb, cc, dd, X[7], 8);
311:                dd = FF2(dd, aa, bb, cc, X[14], 6);
312:                cc = FF2(cc, dd, aa, bb, X[6], 6);
313:                bb = FF2(bb, cc, dd, aa, X[9], 14);
314:                aa = FF2(aa, bb, cc, dd, X[11], 12);
315:                dd = FF2(dd, aa, bb, cc, X[8], 13);
316:                cc = FF2(cc, dd, aa, bb, X[12], 5);
317:                bb = FF2(bb, cc, dd, aa, X[2], 14);
318:                aa = FF2(aa, bb, cc, dd, X[10], 13);
319:                dd = FF2(dd, aa, bb, cc, X[0], 13);
320:                cc = FF2(cc, dd, aa, bb, X[4], 7);
321:                bb = FF2(bb, cc, dd, aa, X[13], 5);
322:
323:                t = c;
324:                c = cc;
325:                cc = t;
326:
327:                //
328:                // Round 4
329:                //
330:                a = F4(a, b, c, d, X[1], 11);
331:                d = F4(d, a, b, c, X[9], 12);
332:                c = F4(c, d, a, b, X[11], 14);
333:                b = F4(b, c, d, a, X[10], 15);
334:                a = F4(a, b, c, d, X[0], 14);
335:                d = F4(d, a, b, c, X[8], 15);
336:                c = F4(c, d, a, b, X[12], 9);
337:                b = F4(b, c, d, a, X[4], 8);
338:                a = F4(a, b, c, d, X[13], 9);
339:                d = F4(d, a, b, c, X[3], 14);
340:                c = F4(c, d, a, b, X[7], 5);
341:                b = F4(b, c, d, a, X[15], 6);
342:                a = F4(a, b, c, d, X[14], 8);
343:                d = F4(d, a, b, c, X[5], 6);
344:                c = F4(c, d, a, b, X[6], 5);
345:                b = F4(b, c, d, a, X[2], 12);
346:
347:                aa = FF1(aa, bb, cc, dd, X[8], 15);
348:                dd = FF1(dd, aa, bb, cc, X[6], 5);
349:                cc = FF1(cc, dd, aa, bb, X[4], 8);
350:                bb = FF1(bb, cc, dd, aa, X[1], 11);
351:                aa = FF1(aa, bb, cc, dd, X[3], 14);
352:                dd = FF1(dd, aa, bb, cc, X[11], 14);
353:                cc = FF1(cc, dd, aa, bb, X[15], 6);
354:                bb = FF1(bb, cc, dd, aa, X[0], 14);
355:                aa = FF1(aa, bb, cc, dd, X[5], 6);
356:                dd = FF1(dd, aa, bb, cc, X[12], 9);
357:                cc = FF1(cc, dd, aa, bb, X[2], 12);
358:                bb = FF1(bb, cc, dd, aa, X[13], 9);
359:                aa = FF1(aa, bb, cc, dd, X[9], 12);
360:                dd = FF1(dd, aa, bb, cc, X[7], 5);
361:                cc = FF1(cc, dd, aa, bb, X[10], 15);
362:                bb = FF1(bb, cc, dd, aa, X[14], 8);
363:
364:                t = d;
365:                d = dd;
366:                dd = t;
367:
368:                H0 += a;
369:                H1 += b;
370:                H2 += c;
371:                H3 += d;
372:                H4 += aa;
373:                H5 += bb;
374:                H6 += cc;
375:                H7 += dd;
376:
377:                //
378:                // reset the offset and clean out the word buffer.
379:                //
380:                xOff = 0;
381:                for (int i = 0; i != X.length; i++) {
382:                    X[i] = 0;
383:                }
384:            }
385:        }
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