Source Code Cross Referenced for GOST28147Mac.java in  » Security » Bouncy-Castle » org » bouncycastle » crypto » macs » 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.macs 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.bouncycastle.crypto.macs;
002:
003:        import org.bouncycastle.crypto.CipherParameters;
004:        import org.bouncycastle.crypto.DataLengthException;
005:        import org.bouncycastle.crypto.Mac;
006:        import org.bouncycastle.crypto.params.KeyParameter;
007:        import org.bouncycastle.crypto.params.ParametersWithSBox;
008:
009:        /**
010:         * implementation of GOST 28147-89 MAC
011:         */
012:        public class GOST28147Mac implements  Mac {
013:            private int blockSize = 8;
014:            private int macSize = 4;
015:            private int bufOff;
016:            private byte[] buf;
017:            private byte[] mac;
018:            private boolean firstStep = true;
019:            private int[] workingKey = null;
020:
021:            //
022:            // This is default S-box - E_A.
023:            private byte S[] = { 0x9, 0x6, 0x3, 0x2, 0x8, 0xB, 0x1, 0x7, 0xA,
024:                    0x4, 0xE, 0xF, 0xC, 0x0, 0xD, 0x5, 0x3, 0x7, 0xE, 0x9, 0x8,
025:                    0xA, 0xF, 0x0, 0x5, 0x2, 0x6, 0xC, 0xB, 0x4, 0xD, 0x1, 0xE,
026:                    0x4, 0x6, 0x2, 0xB, 0x3, 0xD, 0x8, 0xC, 0xF, 0x5, 0xA, 0x0,
027:                    0x7, 0x1, 0x9, 0xE, 0x7, 0xA, 0xC, 0xD, 0x1, 0x3, 0x9, 0x0,
028:                    0x2, 0xB, 0x4, 0xF, 0x8, 0x5, 0x6, 0xB, 0x5, 0x1, 0x9, 0x8,
029:                    0xD, 0xF, 0x0, 0xE, 0x4, 0x2, 0x3, 0xC, 0x7, 0xA, 0x6, 0x3,
030:                    0xA, 0xD, 0xC, 0x1, 0x2, 0x0, 0xB, 0x7, 0x5, 0x9, 0x4, 0x8,
031:                    0xF, 0xE, 0x6, 0x1, 0xD, 0x2, 0x9, 0x7, 0xA, 0x6, 0x0, 0x8,
032:                    0xC, 0x4, 0x5, 0xF, 0x3, 0xB, 0xE, 0xB, 0xA, 0xF, 0x5, 0x0,
033:                    0xC, 0xE, 0x8, 0x6, 0x2, 0x3, 0x9, 0x1, 0x7, 0xD, 0x4 };
034:
035:            public GOST28147Mac() {
036:                mac = new byte[blockSize];
037:
038:                buf = new byte[blockSize];
039:                bufOff = 0;
040:            }
041:
042:            private int[] generateWorkingKey(byte[] userKey) {
043:                if (userKey.length != 32) {
044:                    throw new IllegalArgumentException(
045:                            "Key length invalid. Key needs to be 32 byte - 256 bit!!!");
046:                }
047:
048:                int key[] = new int[8];
049:                for (int i = 0; i != 8; i++) {
050:                    key[i] = bytesToint(userKey, i * 4);
051:                }
052:
053:                return key;
054:            }
055:
056:            public void init(CipherParameters params)
057:                    throws IllegalArgumentException {
058:                reset();
059:                buf = new byte[blockSize];
060:                if (params instanceof  ParametersWithSBox) {
061:                    ParametersWithSBox param = (ParametersWithSBox) params;
062:
063:                    //
064:                    // Set the S-Box
065:                    //
066:                    System.arraycopy(param.getSBox(), 0, this .S, 0, param
067:                            .getSBox().length);
068:
069:                    //
070:                    // set key if there is one
071:                    //
072:                    if (param.getParameters() != null) {
073:                        workingKey = generateWorkingKey(((KeyParameter) param
074:                                .getParameters()).getKey());
075:                    }
076:                } else if (params instanceof  KeyParameter) {
077:                    workingKey = generateWorkingKey(((KeyParameter) params)
078:                            .getKey());
079:                } else {
080:                    throw new IllegalArgumentException(
081:                            "invalid parameter passed to GOST28147 init - "
082:                                    + params.getClass().getName());
083:                }
084:            }
085:
086:            public String getAlgorithmName() {
087:                return "GOST28147Mac";
088:            }
089:
090:            public int getMacSize() {
091:                return macSize;
092:            }
093:
094:            private int gost28147_mainStep(int n1, int key) {
095:                int cm = (key + n1); // CM1
096:
097:                // S-box replacing
098:
099:                int om = S[0 + ((cm >> (0 * 4)) & 0xF)] << (0 * 4);
100:                om += S[16 + ((cm >> (1 * 4)) & 0xF)] << (1 * 4);
101:                om += S[32 + ((cm >> (2 * 4)) & 0xF)] << (2 * 4);
102:                om += S[48 + ((cm >> (3 * 4)) & 0xF)] << (3 * 4);
103:                om += S[64 + ((cm >> (4 * 4)) & 0xF)] << (4 * 4);
104:                om += S[80 + ((cm >> (5 * 4)) & 0xF)] << (5 * 4);
105:                om += S[96 + ((cm >> (6 * 4)) & 0xF)] << (6 * 4);
106:                om += S[112 + ((cm >> (7 * 4)) & 0xF)] << (7 * 4);
107:
108:                return om << 11 | om >>> (32 - 11); // 11-leftshift
109:            }
110:
111:            private void gost28147MacFunc(int[] workingKey, byte[] in,
112:                    int inOff, byte[] out, int outOff) {
113:                int N1, N2, tmp; //tmp -> for saving N1
114:                N1 = bytesToint(in, inOff);
115:                N2 = bytesToint(in, inOff + 4);
116:
117:                for (int k = 0; k < 2; k++) // 1-16 steps
118:                {
119:                    for (int j = 0; j < 8; j++) {
120:                        tmp = N1;
121:                        N1 = N2 ^ gost28147_mainStep(N1, workingKey[j]); // CM2
122:                        N2 = tmp;
123:                    }
124:                }
125:
126:                intTobytes(N1, out, outOff);
127:                intTobytes(N2, out, outOff + 4);
128:            }
129:
130:            //array of bytes to type int
131:            private int bytesToint(byte[] in, int inOff) {
132:                return ((in[inOff + 3] << 24) & 0xff000000)
133:                        + ((in[inOff + 2] << 16) & 0xff0000)
134:                        + ((in[inOff + 1] << 8) & 0xff00) + (in[inOff] & 0xff);
135:            }
136:
137:            //int to array of bytes
138:            private void intTobytes(int num, byte[] out, int outOff) {
139:                out[outOff + 3] = (byte) (num >>> 24);
140:                out[outOff + 2] = (byte) (num >>> 16);
141:                out[outOff + 1] = (byte) (num >>> 8);
142:                out[outOff] = (byte) num;
143:            }
144:
145:            private byte[] CM5func(byte[] buf, int bufOff, byte[] mac) {
146:                byte[] sum = new byte[buf.length - bufOff];
147:
148:                System.arraycopy(buf, bufOff, sum, 0, mac.length);
149:
150:                for (int i = 0; i != mac.length; i++) {
151:                    sum[i] = (byte) (sum[i] ^ mac[i]);
152:                }
153:
154:                return sum;
155:            }
156:
157:            public void update(byte in) throws IllegalStateException {
158:                if (bufOff == buf.length) {
159:                    byte[] sumbuf = new byte[buf.length];
160:                    System.arraycopy(buf, 0, sumbuf, 0, mac.length);
161:
162:                    if (firstStep) {
163:                        firstStep = false;
164:                    } else {
165:                        sumbuf = CM5func(buf, 0, mac);
166:                    }
167:
168:                    gost28147MacFunc(workingKey, sumbuf, 0, mac, 0);
169:                    bufOff = 0;
170:                }
171:
172:                buf[bufOff++] = in;
173:            }
174:
175:            public void update(byte[] in, int inOff, int len)
176:                    throws DataLengthException, IllegalStateException {
177:                if (len < 0) {
178:                    throw new IllegalArgumentException(
179:                            "Can't have a negative input length!");
180:                }
181:
182:                int gapLen = blockSize - bufOff;
183:
184:                if (len > gapLen) {
185:                    System.arraycopy(in, inOff, buf, bufOff, gapLen);
186:
187:                    byte[] sumbuf = new byte[buf.length];
188:                    System.arraycopy(buf, 0, sumbuf, 0, mac.length);
189:
190:                    if (firstStep) {
191:                        firstStep = false;
192:                    } else {
193:                        sumbuf = CM5func(buf, 0, mac);
194:                    }
195:
196:                    gost28147MacFunc(workingKey, sumbuf, 0, mac, 0);
197:
198:                    bufOff = 0;
199:                    len -= gapLen;
200:                    inOff += gapLen;
201:
202:                    while (len > blockSize) {
203:                        sumbuf = CM5func(in, inOff, mac);
204:                        gost28147MacFunc(workingKey, sumbuf, 0, mac, 0);
205:
206:                        len -= blockSize;
207:                        inOff += blockSize;
208:                    }
209:                }
210:
211:                System.arraycopy(in, inOff, buf, bufOff, len);
212:
213:                bufOff += len;
214:            }
215:
216:            public int doFinal(byte[] out, int outOff)
217:                    throws DataLengthException, IllegalStateException {
218:                //padding with zero
219:                while (bufOff < blockSize) {
220:                    buf[bufOff] = 0;
221:                    bufOff++;
222:                }
223:
224:                byte[] sumbuf = new byte[buf.length];
225:                System.arraycopy(buf, 0, sumbuf, 0, mac.length);
226:
227:                if (firstStep) {
228:                    firstStep = false;
229:                } else {
230:                    sumbuf = CM5func(buf, 0, mac);
231:                }
232:
233:                gost28147MacFunc(workingKey, sumbuf, 0, mac, 0);
234:
235:                System.arraycopy(mac, (mac.length / 2) - macSize, out, outOff,
236:                        macSize);
237:
238:                reset();
239:
240:                return macSize;
241:            }
242:
243:            public void reset() {
244:                /*
245:                 * clean the buffer.
246:                 */
247:                for (int i = 0; i < buf.length; i++) {
248:                    buf[i] = 0;
249:                }
250:
251:                bufOff = 0;
252:
253:                firstStep = true;
254:            }
255:        }
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