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1.1 ! root 1: #if defined(LIBC_SCCS) && !defined(lint) ! 2: static char sccsid[] = "@(#)crypt.c 5.3.1.1 (Berkeley) 10/21/90"; ! 3: #endif LIBC_SCCS and not lint ! 4: ! 5: /* ! 6: * This program implements the ! 7: * Proposed Federal Information Processing ! 8: * Data Encryption Standard. ! 9: * See Federal Register, March 17, 1975 (40FR12134) ! 10: */ ! 11: ! 12: /* ! 13: * Initial permutation, ! 14: */ ! 15: static char IP[] = { ! 16: 58,50,42,34,26,18,10, 2, ! 17: 60,52,44,36,28,20,12, 4, ! 18: 62,54,46,38,30,22,14, 6, ! 19: 64,56,48,40,32,24,16, 8, ! 20: 57,49,41,33,25,17, 9, 1, ! 21: 59,51,43,35,27,19,11, 3, ! 22: 61,53,45,37,29,21,13, 5, ! 23: 63,55,47,39,31,23,15, 7, ! 24: }; ! 25: ! 26: /* ! 27: * Final permutation, FP = IP^(-1) ! 28: */ ! 29: static char FP[] = { ! 30: 40, 8,48,16,56,24,64,32, ! 31: 39, 7,47,15,55,23,63,31, ! 32: 38, 6,46,14,54,22,62,30, ! 33: 37, 5,45,13,53,21,61,29, ! 34: 36, 4,44,12,52,20,60,28, ! 35: 35, 3,43,11,51,19,59,27, ! 36: 34, 2,42,10,50,18,58,26, ! 37: 33, 1,41, 9,49,17,57,25, ! 38: }; ! 39: ! 40: /* ! 41: * Permuted-choice 1 from the key bits ! 42: * to yield C and D. ! 43: * Note that bits 8,16... are left out: ! 44: * They are intended for a parity check. ! 45: */ ! 46: static char PC1_C[] = { ! 47: 57,49,41,33,25,17, 9, ! 48: 1,58,50,42,34,26,18, ! 49: 10, 2,59,51,43,35,27, ! 50: 19,11, 3,60,52,44,36, ! 51: }; ! 52: ! 53: static char PC1_D[] = { ! 54: 63,55,47,39,31,23,15, ! 55: 7,62,54,46,38,30,22, ! 56: 14, 6,61,53,45,37,29, ! 57: 21,13, 5,28,20,12, 4, ! 58: }; ! 59: ! 60: /* ! 61: * Sequence of shifts used for the key schedule. ! 62: */ ! 63: static char shifts[] = { ! 64: 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1, ! 65: }; ! 66: ! 67: /* ! 68: * Permuted-choice 2, to pick out the bits from ! 69: * the CD array that generate the key schedule. ! 70: */ ! 71: static char PC2_C[] = { ! 72: 14,17,11,24, 1, 5, ! 73: 3,28,15, 6,21,10, ! 74: 23,19,12, 4,26, 8, ! 75: 16, 7,27,20,13, 2, ! 76: }; ! 77: ! 78: static char PC2_D[] = { ! 79: 41,52,31,37,47,55, ! 80: 30,40,51,45,33,48, ! 81: 44,49,39,56,34,53, ! 82: 46,42,50,36,29,32, ! 83: }; ! 84: ! 85: /* ! 86: * The C and D arrays used to calculate the key schedule. ! 87: */ ! 88: ! 89: static char C[28]; ! 90: static char D[28]; ! 91: /* ! 92: * The key schedule. ! 93: * Generated from the key. ! 94: */ ! 95: static char KS[16][48]; ! 96: ! 97: /* ! 98: * The E bit-selection table. ! 99: */ ! 100: static char E[48]; ! 101: static char e[] = { ! 102: 32, 1, 2, 3, 4, 5, ! 103: 4, 5, 6, 7, 8, 9, ! 104: 8, 9,10,11,12,13, ! 105: 12,13,14,15,16,17, ! 106: 16,17,18,19,20,21, ! 107: 20,21,22,23,24,25, ! 108: 24,25,26,27,28,29, ! 109: 28,29,30,31,32, 1, ! 110: }; ! 111: ! 112: /* ! 113: * Set up the key schedule from the key. ! 114: */ ! 115: ! 116: setkey(key) ! 117: char *key; ! 118: { ! 119: register i, j, k; ! 120: int t; ! 121: ! 122: /* ! 123: * First, generate C and D by permuting ! 124: * the key. The low order bit of each ! 125: * 8-bit char is not used, so C and D are only 28 ! 126: * bits apiece. ! 127: */ ! 128: for (i=0; i<28; i++) { ! 129: C[i] = key[PC1_C[i]-1]; ! 130: D[i] = key[PC1_D[i]-1]; ! 131: } ! 132: /* ! 133: * To generate Ki, rotate C and D according ! 134: * to schedule and pick up a permutation ! 135: * using PC2. ! 136: */ ! 137: for (i=0; i<16; i++) { ! 138: /* ! 139: * rotate. ! 140: */ ! 141: for (k=0; k<shifts[i]; k++) { ! 142: t = C[0]; ! 143: for (j=0; j<28-1; j++) ! 144: C[j] = C[j+1]; ! 145: C[27] = t; ! 146: t = D[0]; ! 147: for (j=0; j<28-1; j++) ! 148: D[j] = D[j+1]; ! 149: D[27] = t; ! 150: } ! 151: /* ! 152: * get Ki. Note C and D are concatenated. ! 153: */ ! 154: for (j=0; j<24; j++) { ! 155: KS[i][j] = C[PC2_C[j]-1]; ! 156: KS[i][j+24] = D[PC2_D[j]-28-1]; ! 157: } ! 158: } ! 159: ! 160: for(i=0;i<48;i++) ! 161: E[i] = e[i]; ! 162: } ! 163: ! 164: /* ! 165: * The 8 selection functions. ! 166: * For some reason, they give a 0-origin ! 167: * index, unlike everything else. ! 168: */ ! 169: static char S[8][64] = { ! 170: 14, 4,13, 1, 2,15,11, 8, 3,10, 6,12, 5, 9, 0, 7, ! 171: 0,15, 7, 4,14, 2,13, 1,10, 6,12,11, 9, 5, 3, 8, ! 172: 4, 1,14, 8,13, 6, 2,11,15,12, 9, 7, 3,10, 5, 0, ! 173: 15,12, 8, 2, 4, 9, 1, 7, 5,11, 3,14,10, 0, 6,13, ! 174: ! 175: 15, 1, 8,14, 6,11, 3, 4, 9, 7, 2,13,12, 0, 5,10, ! 176: 3,13, 4, 7,15, 2, 8,14,12, 0, 1,10, 6, 9,11, 5, ! 177: 0,14, 7,11,10, 4,13, 1, 5, 8,12, 6, 9, 3, 2,15, ! 178: 13, 8,10, 1, 3,15, 4, 2,11, 6, 7,12, 0, 5,14, 9, ! 179: ! 180: 10, 0, 9,14, 6, 3,15, 5, 1,13,12, 7,11, 4, 2, 8, ! 181: 13, 7, 0, 9, 3, 4, 6,10, 2, 8, 5,14,12,11,15, 1, ! 182: 13, 6, 4, 9, 8,15, 3, 0,11, 1, 2,12, 5,10,14, 7, ! 183: 1,10,13, 0, 6, 9, 8, 7, 4,15,14, 3,11, 5, 2,12, ! 184: ! 185: 7,13,14, 3, 0, 6, 9,10, 1, 2, 8, 5,11,12, 4,15, ! 186: 13, 8,11, 5, 6,15, 0, 3, 4, 7, 2,12, 1,10,14, 9, ! 187: 10, 6, 9, 0,12,11, 7,13,15, 1, 3,14, 5, 2, 8, 4, ! 188: 3,15, 0, 6,10, 1,13, 8, 9, 4, 5,11,12, 7, 2,14, ! 189: ! 190: 2,12, 4, 1, 7,10,11, 6, 8, 5, 3,15,13, 0,14, 9, ! 191: 14,11, 2,12, 4, 7,13, 1, 5, 0,15,10, 3, 9, 8, 6, ! 192: 4, 2, 1,11,10,13, 7, 8,15, 9,12, 5, 6, 3, 0,14, ! 193: 11, 8,12, 7, 1,14, 2,13, 6,15, 0, 9,10, 4, 5, 3, ! 194: ! 195: 12, 1,10,15, 9, 2, 6, 8, 0,13, 3, 4,14, 7, 5,11, ! 196: 10,15, 4, 2, 7,12, 9, 5, 6, 1,13,14, 0,11, 3, 8, ! 197: 9,14,15, 5, 2, 8,12, 3, 7, 0, 4,10, 1,13,11, 6, ! 198: 4, 3, 2,12, 9, 5,15,10,11,14, 1, 7, 6, 0, 8,13, ! 199: ! 200: 4,11, 2,14,15, 0, 8,13, 3,12, 9, 7, 5,10, 6, 1, ! 201: 13, 0,11, 7, 4, 9, 1,10,14, 3, 5,12, 2,15, 8, 6, ! 202: 1, 4,11,13,12, 3, 7,14,10,15, 6, 8, 0, 5, 9, 2, ! 203: 6,11,13, 8, 1, 4,10, 7, 9, 5, 0,15,14, 2, 3,12, ! 204: ! 205: 13, 2, 8, 4, 6,15,11, 1,10, 9, 3,14, 5, 0,12, 7, ! 206: 1,15,13, 8,10, 3, 7, 4,12, 5, 6,11, 0,14, 9, 2, ! 207: 7,11, 4, 1, 9,12,14, 2, 0, 6,10,13,15, 3, 5, 8, ! 208: 2, 1,14, 7, 4,10, 8,13,15,12, 9, 0, 3, 5, 6,11, ! 209: }; ! 210: ! 211: /* ! 212: * P is a permutation on the selected combination ! 213: * of the current L and key. ! 214: */ ! 215: static char P[] = { ! 216: 16, 7,20,21, ! 217: 29,12,28,17, ! 218: 1,15,23,26, ! 219: 5,18,31,10, ! 220: 2, 8,24,14, ! 221: 32,27, 3, 9, ! 222: 19,13,30, 6, ! 223: 22,11, 4,25, ! 224: }; ! 225: ! 226: /* ! 227: * The current block, divided into 2 halves. ! 228: */ ! 229: static char L[64], *R = L+32; ! 230: static char tempL[32]; ! 231: static char f[32]; ! 232: ! 233: /* ! 234: * The combination of the key and the input, before selection. ! 235: */ ! 236: static char preS[48]; ! 237: ! 238: /* ! 239: * The payoff: encrypt a block. ! 240: */ ! 241: ! 242: encrypt(block, edflag) ! 243: char *block; ! 244: { ! 245: int i, ii; ! 246: register t, j, k; ! 247: ! 248: /* ! 249: * First, permute the bits in the input ! 250: */ ! 251: for (j=0; j<64; j++) ! 252: L[j] = block[IP[j]-1]; ! 253: /* ! 254: * Perform an encryption operation 16 times. ! 255: */ ! 256: for (ii=0; ii<16; ii++) { ! 257: /* ! 258: * Only encrypt for now. ! 259: */ ! 260: i = ii; ! 261: /* ! 262: * Save the R array, ! 263: * which will be the new L. ! 264: */ ! 265: for (j=0; j<32; j++) ! 266: tempL[j] = R[j]; ! 267: /* ! 268: * Expand R to 48 bits using the E selector; ! 269: * exclusive-or with the current key bits. ! 270: */ ! 271: for (j=0; j<48; j++) ! 272: preS[j] = R[E[j]-1] ^ KS[i][j]; ! 273: /* ! 274: * The pre-select bits are now considered ! 275: * in 8 groups of 6 bits each. ! 276: * The 8 selection functions map these ! 277: * 6-bit quantities into 4-bit quantities ! 278: * and the results permuted ! 279: * to make an f(R, K). ! 280: * The indexing into the selection functions ! 281: * is peculiar; it could be simplified by ! 282: * rewriting the tables. ! 283: */ ! 284: for (j=0; j<8; j++) { ! 285: t = 6*j; ! 286: k = S[j][(preS[t+0]<<5)+ ! 287: (preS[t+1]<<3)+ ! 288: (preS[t+2]<<2)+ ! 289: (preS[t+3]<<1)+ ! 290: (preS[t+4]<<0)+ ! 291: (preS[t+5]<<4)]; ! 292: t = 4*j; ! 293: f[t+0] = (k>>3)&01; ! 294: f[t+1] = (k>>2)&01; ! 295: f[t+2] = (k>>1)&01; ! 296: f[t+3] = (k>>0)&01; ! 297: } ! 298: /* ! 299: * The new R is L ^ f(R, K). ! 300: * The f here has to be permuted first, though. ! 301: */ ! 302: for (j=0; j<32; j++) ! 303: R[j] = L[j] ^ f[P[j]-1]; ! 304: /* ! 305: * Finally, the new L (the original R) ! 306: * is copied back. ! 307: */ ! 308: for (j=0; j<32; j++) ! 309: L[j] = tempL[j]; ! 310: } ! 311: /* ! 312: * The output L and R are reversed. ! 313: */ ! 314: for (j=0; j<32; j++) { ! 315: t = L[j]; ! 316: L[j] = R[j]; ! 317: R[j] = t; ! 318: } ! 319: /* ! 320: * The final output ! 321: * gets the inverse permutation of the very original. ! 322: */ ! 323: for (j=0; j<64; j++) ! 324: block[j] = L[FP[j]-1]; ! 325: } ! 326: ! 327: char * ! 328: crypt(pw,salt) ! 329: char *pw; ! 330: char *salt; ! 331: { ! 332: register i, j, c; ! 333: int temp; ! 334: static char block[66], iobuf[16]; ! 335: ! 336: for(i=0; i<66; i++) ! 337: block[i] = 0; ! 338: for(i=0; (c= *pw) && i<64; pw++){ ! 339: for(j=0; j<7; j++, i++) ! 340: block[i] = (c>>(6-j)) & 01; ! 341: i++; ! 342: } ! 343: ! 344: setkey(block); ! 345: ! 346: for(i=0; i<66; i++) ! 347: block[i] = 0; ! 348: ! 349: for(i=0;i<2;i++){ ! 350: c = *salt++; ! 351: iobuf[i] = c; ! 352: if(c>'Z') c -= 6; ! 353: if(c>'9') c -= 7; ! 354: c -= '.'; ! 355: for(j=0;j<6;j++){ ! 356: if((c>>j) & 01){ ! 357: temp = E[6*i+j]; ! 358: E[6*i+j] = E[6*i+j+24]; ! 359: E[6*i+j+24] = temp; ! 360: } ! 361: } ! 362: } ! 363: ! 364: for(i=0; i<25; i++) ! 365: encrypt(block,0); ! 366: ! 367: for(i=0; i<11; i++){ ! 368: c = 0; ! 369: for(j=0; j<6; j++){ ! 370: c <<= 1; ! 371: c |= block[6*i+j]; ! 372: } ! 373: c += '.'; ! 374: if(c>'9') c += 7; ! 375: if(c>'Z') c += 6; ! 376: iobuf[i+2] = c; ! 377: } ! 378: iobuf[i+2] = 0; ! 379: if(iobuf[1]==0) ! 380: iobuf[1] = iobuf[0]; ! 381: return(iobuf); ! 382: }
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