Source Code Cross Referenced for MD2Digest.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:        import org.bouncycastle.crypto.*;
004:
005:        /**
006:         * implementation of MD2
007:         * as outlined in RFC1319 by B.Kaliski from RSA Laboratories April 1992
008:         */
009:        public class MD2Digest implements  ExtendedDigest {
010:            private static final int DIGEST_LENGTH = 16;
011:
012:            /* X buffer */
013:            private byte[] X = new byte[48];
014:            private int xOff;
015:            /* M buffer */
016:            private byte[] M = new byte[16];
017:            private int mOff;
018:            /* check sum */
019:            private byte[] C = new byte[16];
020:            private int COff;
021:
022:            public MD2Digest() {
023:                reset();
024:            }
025:
026:            public MD2Digest(MD2Digest t) {
027:                System.arraycopy(t.X, 0, X, 0, t.X.length);
028:                xOff = t.xOff;
029:                System.arraycopy(t.M, 0, M, 0, t.M.length);
030:                mOff = t.mOff;
031:                System.arraycopy(t.C, 0, C, 0, t.C.length);
032:                COff = t.COff;
033:            }
034:
035:            /**
036:             * return the algorithm name
037:             *
038:             * @return the algorithm name
039:             */
040:            public String getAlgorithmName() {
041:                return "MD2";
042:            }
043:
044:            /**
045:             * return the size, in bytes, of the digest produced by this message digest.
046:             *
047:             * @return the size, in bytes, of the digest produced by this message digest.
048:             */
049:            public int getDigestSize() {
050:                return DIGEST_LENGTH;
051:            }
052:
053:            /**
054:             * close the digest, producing the final digest value. The doFinal
055:             * call leaves the digest reset.
056:             *
057:             * @param out the array the digest is to be copied into.
058:             * @param outOff the offset into the out array the digest is to start at.
059:             */
060:            public int doFinal(byte[] out, int outOff) {
061:                // add padding
062:                byte paddingByte = (byte) (M.length - mOff);
063:                for (int i = mOff; i < M.length; i++) {
064:                    M[i] = paddingByte;
065:                }
066:                //do final check sum
067:                processCheckSum(M);
068:                // do final block process
069:                processBlock(M);
070:
071:                processBlock(C);
072:
073:                System.arraycopy(X, xOff, out, outOff, 16);
074:
075:                reset();
076:
077:                return DIGEST_LENGTH;
078:            }
079:
080:            /**
081:             * reset the digest back to it's initial state.
082:             */
083:            public void reset() {
084:                xOff = 0;
085:                for (int i = 0; i != X.length; i++) {
086:                    X[i] = 0;
087:                }
088:                mOff = 0;
089:                for (int i = 0; i != M.length; i++) {
090:                    M[i] = 0;
091:                }
092:                COff = 0;
093:                for (int i = 0; i != C.length; i++) {
094:                    C[i] = 0;
095:                }
096:            }
097:
098:            /**
099:             * update the message digest with a single byte.
100:             *
101:             * @param in the input byte to be entered.
102:             */
103:            public void update(byte in) {
104:                M[mOff++] = in;
105:
106:                if (mOff == 16) {
107:                    processCheckSum(M);
108:                    processBlock(M);
109:                    mOff = 0;
110:                }
111:            }
112:
113:            /**
114:             * update the message digest with a block of bytes.
115:             *
116:             * @param in the byte array containing the data.
117:             * @param inOff the offset into the byte array where the data starts.
118:             * @param len the length of the data.
119:             */
120:            public void update(byte[] in, int inOff, int len) {
121:                //
122:                // fill the current word
123:                //
124:                while ((mOff != 0) && (len > 0)) {
125:                    update(in[inOff]);
126:                    inOff++;
127:                    len--;
128:                }
129:
130:                //
131:                // process whole words.
132:                //
133:                while (len > 16) {
134:                    System.arraycopy(in, inOff, M, 0, 16);
135:                    processCheckSum(M);
136:                    processBlock(M);
137:                    len -= 16;
138:                    inOff += 16;
139:                }
140:
141:                //
142:                // load in the remainder.
143:                //
144:                while (len > 0) {
145:                    update(in[inOff]);
146:                    inOff++;
147:                    len--;
148:                }
149:            }
150:
151:            protected void processCheckSum(byte[] m) {
152:                int L = C[15];
153:                for (int i = 0; i < 16; i++) {
154:                    C[i] ^= S[(m[i] ^ L) & 0xff];
155:                    L = C[i];
156:                }
157:            }
158:
159:            protected void processBlock(byte[] m) {
160:                for (int i = 0; i < 16; i++) {
161:                    X[i + 16] = m[i];
162:                    X[i + 32] = (byte) (m[i] ^ X[i]);
163:                }
164:                // encrypt block
165:                int t = 0;
166:
167:                for (int j = 0; j < 18; j++) {
168:                    for (int k = 0; k < 48; k++) {
169:                        t = X[k] ^= S[t];
170:                        t = t & 0xff;
171:                    }
172:                    t = (t + j) % 256;
173:                }
174:            }
175:
176:            // 256-byte random permutation constructed from the digits of PI
177:            private static final byte[] S = { (byte) 41, (byte) 46, (byte) 67,
178:                    (byte) 201, (byte) 162, (byte) 216, (byte) 124, (byte) 1,
179:                    (byte) 61, (byte) 54, (byte) 84, (byte) 161, (byte) 236,
180:                    (byte) 240, (byte) 6, (byte) 19, (byte) 98, (byte) 167,
181:                    (byte) 5, (byte) 243, (byte) 192, (byte) 199, (byte) 115,
182:                    (byte) 140, (byte) 152, (byte) 147, (byte) 43, (byte) 217,
183:                    (byte) 188, (byte) 76, (byte) 130, (byte) 202, (byte) 30,
184:                    (byte) 155, (byte) 87, (byte) 60, (byte) 253, (byte) 212,
185:                    (byte) 224, (byte) 22, (byte) 103, (byte) 66, (byte) 111,
186:                    (byte) 24, (byte) 138, (byte) 23, (byte) 229, (byte) 18,
187:                    (byte) 190, (byte) 78, (byte) 196, (byte) 214, (byte) 218,
188:                    (byte) 158, (byte) 222, (byte) 73, (byte) 160, (byte) 251,
189:                    (byte) 245, (byte) 142, (byte) 187, (byte) 47, (byte) 238,
190:                    (byte) 122, (byte) 169, (byte) 104, (byte) 121, (byte) 145,
191:                    (byte) 21, (byte) 178, (byte) 7, (byte) 63, (byte) 148,
192:                    (byte) 194, (byte) 16, (byte) 137, (byte) 11, (byte) 34,
193:                    (byte) 95, (byte) 33, (byte) 128, (byte) 127, (byte) 93,
194:                    (byte) 154, (byte) 90, (byte) 144, (byte) 50, (byte) 39,
195:                    (byte) 53, (byte) 62, (byte) 204, (byte) 231, (byte) 191,
196:                    (byte) 247, (byte) 151, (byte) 3, (byte) 255, (byte) 25,
197:                    (byte) 48, (byte) 179, (byte) 72, (byte) 165, (byte) 181,
198:                    (byte) 209, (byte) 215, (byte) 94, (byte) 146, (byte) 42,
199:                    (byte) 172, (byte) 86, (byte) 170, (byte) 198, (byte) 79,
200:                    (byte) 184, (byte) 56, (byte) 210, (byte) 150, (byte) 164,
201:                    (byte) 125, (byte) 182, (byte) 118, (byte) 252, (byte) 107,
202:                    (byte) 226, (byte) 156, (byte) 116, (byte) 4, (byte) 241,
203:                    (byte) 69, (byte) 157, (byte) 112, (byte) 89, (byte) 100,
204:                    (byte) 113, (byte) 135, (byte) 32, (byte) 134, (byte) 91,
205:                    (byte) 207, (byte) 101, (byte) 230, (byte) 45, (byte) 168,
206:                    (byte) 2, (byte) 27, (byte) 96, (byte) 37, (byte) 173,
207:                    (byte) 174, (byte) 176, (byte) 185, (byte) 246, (byte) 28,
208:                    (byte) 70, (byte) 97, (byte) 105, (byte) 52, (byte) 64,
209:                    (byte) 126, (byte) 15, (byte) 85, (byte) 71, (byte) 163,
210:                    (byte) 35, (byte) 221, (byte) 81, (byte) 175, (byte) 58,
211:                    (byte) 195, (byte) 92, (byte) 249, (byte) 206, (byte) 186,
212:                    (byte) 197, (byte) 234, (byte) 38, (byte) 44, (byte) 83,
213:                    (byte) 13, (byte) 110, (byte) 133, (byte) 40, (byte) 132,
214:                    9, (byte) 211, (byte) 223, (byte) 205, (byte) 244,
215:                    (byte) 65, (byte) 129, (byte) 77, (byte) 82, (byte) 106,
216:                    (byte) 220, (byte) 55, (byte) 200, (byte) 108, (byte) 193,
217:                    (byte) 171, (byte) 250, (byte) 36, (byte) 225, (byte) 123,
218:                    (byte) 8, (byte) 12, (byte) 189, (byte) 177, (byte) 74,
219:                    (byte) 120, (byte) 136, (byte) 149, (byte) 139, (byte) 227,
220:                    (byte) 99, (byte) 232, (byte) 109, (byte) 233, (byte) 203,
221:                    (byte) 213, (byte) 254, (byte) 59, (byte) 0, (byte) 29,
222:                    (byte) 57, (byte) 242, (byte) 239, (byte) 183, (byte) 14,
223:                    (byte) 102, (byte) 88, (byte) 208, (byte) 228, (byte) 166,
224:                    (byte) 119, (byte) 114, (byte) 248, (byte) 235, (byte) 117,
225:                    (byte) 75, (byte) 10, (byte) 49, (byte) 68, (byte) 80,
226:                    (byte) 180, (byte) 143, (byte) 237, (byte) 31, (byte) 26,
227:                    (byte) 219, (byte) 153, (byte) 141, (byte) 51, (byte) 159,
228:                    (byte) 17, (byte) 131, (byte) 20 };
229:
230:            public int getByteLength() {
231:                return 16;
232:            }
233:        }
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