Szyfrowanie algorytmem DES - kod źródłowy JAVA
Implementacja algorytmu DES w języku java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 | import java.io.*;class algorithm { private byte[] tKey, Msg; private byte[][] PKeys; public String Run(String mode) { return RunDes(mode); } public String RunDes(String mode) { if (Msg.length < 8) return "Wiadomość mniejsza od 64 bitów."; Msg = selectBits(Msg, IP); int blockSize = IP.length; byte[] l = selectBits(Msg, 0, blockSize / 2); byte[] r = selectBits(Msg, blockSize / 2, blockSize / 2); int numOfSubKeys = PKeys.length; for (int k = 0; k < numOfSubKeys; k++) { byte[] rBackup = r; r = selectBits(r, E); if (mode.equalsIgnoreCase("szyfruj")) r = doXORBytes(r, PKeys[k]); else if (mode.equalsIgnoreCase("rozszyfruj")) r = doXORBytes(r, PKeys[numOfSubKeys - k - 1]); r = substitution6x4(r); r = selectBits(r, P); r = doXORBytes(l, r); l = rBackup; } byte[] lr = concatenateBits(r, blockSize / 2, l, blockSize / 2); lr = selectBits(lr, INVP); String ret = ""; for (int i = 0; i < lr.length; i++) { ret = ret + (char) lr[i]; } return ret; } public void AddKey(String key) { try { tKey = key.getBytes(); PKeys = getSubkeys(tKey); } catch (Exception e) { e.printStackTrace(); } } public void AddMsg(String msg) { try { Msg = msg.getBytes(); } catch (Exception e) { e.printStackTrace(); } } static final int[] IP = { 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7 }; static final int[] E = { 32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17, 16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25, 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 1 }; static final int[] P = { 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25 }; static final int[] INVP = { 40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31, 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 29, 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11, 51, 19, 59, 27, 34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49, 17, 57, 25 }; private static byte[] doXORBytes(byte[] a, byte[] b) { byte[] out = new byte[a.length]; for (int i = 0; i < a.length; i++) { out[i] = (byte) (a[i] ^ b[i]); } return out; } static final int[] S = { 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7, // S1 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8, 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13, 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10, // S2 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5, 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9, 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8, // S3 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1, 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12, 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15, // S4 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9, 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14, 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9, // S5 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6, 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3, 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11, // S6 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13, 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1, // S7 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6, 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12, 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7, // S8 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2, 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 }; private static byte[] substitution6x4(byte[] in) { in = splitBytes(in, 6); byte[] out = new byte[in.length / 2]; int lhByte = 0; for (int b = 0; b < in.length; b++) { byte valByte = in[b]; int r = 2 * (valByte >> 7 & 0x0001) + (valByte >> 2 & 0x0001); int c = valByte >> 3 & 0x000F; int hByte = S[64 * b + 16 * r + c]; if (b % 2 == 0) lhByte = hByte; else out[b / 2] = (byte) (16 * lhByte + hByte); } return out; } private static byte[] splitBytes(byte[] in, int len) { int numOfBytes = (8 * in.length - 1) / len + 1; byte[] out = new byte[numOfBytes]; for (int i = 0; i < numOfBytes; i++) { for (int j = 0; j < len; j++) { int val = getBit(in, len * i + j); setBit(out, 8 * i + j, val); } } return out; } static final int[] PC1 = { 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36, 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4 }; static final int[] PC2 = { 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32 }; static final int[] SHIFTS = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 }; private static byte[][] getSubkeys(byte[] theKey) throws Exception { int activeKeySize = PC1.length; int numOfSubKeys = SHIFTS.length; byte[] activeKey = selectBits(theKey, PC1); int halfKeySize = activeKeySize / 2; byte[] c = selectBits(activeKey, 0, halfKeySize); byte[] d = selectBits(activeKey, halfKeySize, halfKeySize); byte[][] subKeys = new byte[numOfSubKeys][]; for (int k = 0; k < numOfSubKeys; k++) { c = rotateLeft(c, halfKeySize, SHIFTS[k]); d = rotateLeft(d, halfKeySize, SHIFTS[k]); byte[] cd = concatenateBits(c, halfKeySize, d, halfKeySize); subKeys[k] = selectBits(cd, PC2); } return subKeys; } private static byte[] rotateLeft(byte[] in, int len, int step) { int numOfBytes = (len - 1) / 8 + 1; byte[] out = new byte[numOfBytes]; for (int i = 0; i < len; i++) { int val = getBit(in, (i + step) % len); setBit(out, i, val); } return out; } private static byte[] concatenateBits(byte[] a, int aLen, byte[] b, int bLen) { int numOfBytes = (aLen + bLen - 1) / 8 + 1; byte[] out = new byte[numOfBytes]; int j = 0; for (int i = 0; i < aLen; i++) { int val = getBit(a, i); setBit(out, j, val); j++; } for (int i = 0; i < bLen; i++) { int val = getBit(b, i); setBit(out, j, val); j++; } return out; } private static byte[] selectBits(byte[] in, int pos, int len) { int numOfBytes = (len - 1) / 8 + 1; byte[] out = new byte[numOfBytes]; for (int i = 0; i < len; i++) { int val = getBit(in, pos + i); setBit(out, i, val); } return out; } private static byte[] selectBits(byte[] in, int[] map) { int numOfBytes = (map.length - 1) / 8 + 1; byte[] out = new byte[numOfBytes]; for (int i = 0; i < map.length; i++) { int val = getBit(in, map[i] - 1); setBit(out, i, val); } return out; } private static int getBit(byte[] data, int pos) { int posByte = pos / 8; int posBit = pos % 8; byte valByte = data[posByte]; int valInt = valByte >> (8 - (posBit + 1)) & 0x0001; return valInt; } private static void setBit(byte[] data, int pos, int val) { int posByte = pos / 8; int posBit = pos % 8; byte oldByte = data[posByte]; oldByte = (byte) (((0xFF7F >> posBit) & oldByte) & 0x00FF); byte newByte = (byte) ((val << (8 - (posBit + 1))) | oldByte); data[posByte] = newByte; } private String RetBytes(byte[] data, String name) { String ret = ""; for (int i = 0; i < data.length; i++) ret += data[i]; return String.valueOf(ret); } private static String byteToBits(byte b) { StringBuffer buf = new StringBuffer(); for (int i = 0; i < 8; i++) buf.append((int) (b >> (8 - (i + 1)) & 0x0001)); return buf.toString(); }} |
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