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1.1 ! root 1: /* ! 2: * Copyright (c) 1983 Regents of the University of California. ! 3: * All rights reserved. ! 4: * ! 5: * Redistribution and use in source and binary forms are permitted ! 6: * provided that: (1) source distributions retain this entire copyright ! 7: * notice and comment, and (2) distributions including binaries display ! 8: * the following acknowledgement: ``This product includes software ! 9: * developed by the University of California, Berkeley and its contributors'' ! 10: * in the documentation or other materials provided with the distribution ! 11: * and in all advertising materials mentioning features or use of this ! 12: * software. Neither the name of the University nor the names of its ! 13: * contributors may be used to endorse or promote products derived ! 14: * from this software without specific prior written permission. ! 15: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR ! 16: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED ! 17: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ! 18: */ ! 19: ! 20: #if defined(LIBC_SCCS) && !defined(lint) ! 21: static char sccsid[] = "@(#)ruserpass.c 5.7 (Berkeley) 6/1/90"; ! 22: #endif /* LIBC_SCCS and not lint */ ! 23: ! 24: #include <sys/types.h> ! 25: #include <sys/stat.h> ! 26: #include <errno.h> ! 27: #include <utmp.h> ! 28: #include <ctype.h> ! 29: #include <stdio.h> ! 30: ! 31: char *renvlook(), *malloc(), *index(), *getenv(), *getpass(), *getlogin(); ! 32: struct utmp *getutmp(); ! 33: static FILE *cfile; ! 34: ! 35: ruserpass(host, aname, apass) ! 36: char *host, **aname, **apass; ! 37: { ! 38: ! 39: renv(host, aname, apass); ! 40: if (*aname == 0 || *apass == 0) ! 41: rnetrc(host, aname, apass); ! 42: if (*aname == 0) { ! 43: char *myname = getlogin(); ! 44: *aname = malloc(16); ! 45: printf("Name (%s:%s): ", host, myname); ! 46: fflush(stdout); ! 47: if (read(2, *aname, 16) <= 0) ! 48: exit(1); ! 49: if ((*aname)[0] == '\n') ! 50: *aname = myname; ! 51: else ! 52: if (index(*aname, '\n')) ! 53: *index(*aname, '\n') = 0; ! 54: } ! 55: if (*aname && *apass == 0) { ! 56: printf("Password (%s:%s): ", host, *aname); ! 57: fflush(stdout); ! 58: *apass = getpass(""); ! 59: } ! 60: } ! 61: ! 62: static ! 63: renv(host, aname, apass) ! 64: char *host, **aname, **apass; ! 65: { ! 66: register char *cp; ! 67: char *stemp, fgetlogin, *comma; ! 68: ! 69: cp = renvlook(host); ! 70: if (cp == NULL) ! 71: return; ! 72: if (!isalpha(cp[0])) ! 73: return; ! 74: comma = index(cp, ','); ! 75: if (comma == 0) ! 76: return; ! 77: if (*aname == 0) { ! 78: *aname = malloc(comma - cp + 1); ! 79: strncpy(*aname, cp, comma - cp); ! 80: } else ! 81: if (strncmp(*aname, cp, comma - cp)) ! 82: return; ! 83: comma++; ! 84: cp = malloc(strlen(comma)+1); ! 85: strcpy(cp, comma); ! 86: *apass = malloc(16); ! 87: mkpwclear(cp, host[0], *apass); ! 88: } ! 89: ! 90: static ! 91: char * ! 92: renvlook(host) ! 93: char *host; ! 94: { ! 95: register char *cp, **env; ! 96: extern char **environ; ! 97: ! 98: env = environ; ! 99: for (env = environ; *env != NULL; env++) ! 100: if (!strncmp(*env, "MACH", 4)) { ! 101: cp = index(*env, '='); ! 102: if (cp == 0) ! 103: continue; ! 104: if (strncmp(*env+4, host, cp-(*env+4))) ! 105: continue; ! 106: return (cp+1); ! 107: } ! 108: return (NULL); ! 109: } ! 110: ! 111: #define DEFAULT 1 ! 112: #define LOGIN 2 ! 113: #define PASSWD 3 ! 114: #define NOTIFY 4 ! 115: #define WRITE 5 ! 116: #define YES 6 ! 117: #define NO 7 ! 118: #define COMMAND 8 ! 119: #define FORCE 9 ! 120: #define ID 10 ! 121: #define MACHINE 11 ! 122: ! 123: static char tokval[100]; ! 124: ! 125: static struct toktab { ! 126: char *tokstr; ! 127: int tval; ! 128: } toktab[]= { ! 129: "default", DEFAULT, ! 130: "login", LOGIN, ! 131: "password", PASSWD, ! 132: "notify", NOTIFY, ! 133: "write", WRITE, ! 134: "yes", YES, ! 135: "y", YES, ! 136: "no", NO, ! 137: "n", NO, ! 138: "command", COMMAND, ! 139: "force", FORCE, ! 140: "machine", MACHINE, ! 141: 0, 0 ! 142: }; ! 143: ! 144: static ! 145: rnetrc(host, aname, apass) ! 146: char *host, **aname, **apass; ! 147: { ! 148: char *hdir, buf[BUFSIZ]; ! 149: int t; ! 150: struct stat stb; ! 151: extern int errno; ! 152: ! 153: hdir = getenv("HOME"); ! 154: if (hdir == NULL) ! 155: hdir = "."; ! 156: (void)sprintf(buf, "%s/.netrc", hdir); ! 157: cfile = fopen(buf, "r"); ! 158: if (cfile == NULL) { ! 159: if (errno != ENOENT) ! 160: perror(buf); ! 161: return; ! 162: } ! 163: next: ! 164: while ((t = token())) switch(t) { ! 165: ! 166: case DEFAULT: ! 167: (void) token(); ! 168: continue; ! 169: ! 170: case MACHINE: ! 171: if (token() != ID || strcmp(host, tokval)) ! 172: continue; ! 173: while ((t = token()) && t != MACHINE) switch(t) { ! 174: ! 175: case LOGIN: ! 176: if (token()) ! 177: if (*aname == 0) { ! 178: *aname = malloc(strlen(tokval) + 1); ! 179: strcpy(*aname, tokval); ! 180: } else { ! 181: if (strcmp(*aname, tokval)) ! 182: goto next; ! 183: } ! 184: break; ! 185: case PASSWD: ! 186: if (fstat(fileno(cfile), &stb) >= 0 ! 187: && (stb.st_mode & 077) != 0) { ! 188: fprintf(stderr, "Error - .netrc file not correct mode.\n"); ! 189: fprintf(stderr, "Remove password or correct mode.\n"); ! 190: exit(1); ! 191: } ! 192: if (token() && *apass == 0) { ! 193: *apass = malloc(strlen(tokval) + 1); ! 194: strcpy(*apass, tokval); ! 195: } ! 196: break; ! 197: case COMMAND: ! 198: case NOTIFY: ! 199: case WRITE: ! 200: case FORCE: ! 201: (void) token(); ! 202: break; ! 203: default: ! 204: fprintf(stderr, "Unknown .netrc option %s\n", tokval); ! 205: break; ! 206: } ! 207: goto done; ! 208: } ! 209: done: ! 210: fclose(cfile); ! 211: } ! 212: ! 213: static ! 214: token() ! 215: { ! 216: char *cp; ! 217: int c; ! 218: struct toktab *t; ! 219: ! 220: if (feof(cfile)) ! 221: return (0); ! 222: while ((c = getc(cfile)) != EOF && ! 223: (c == '\n' || c == '\t' || c == ' ' || c == ',')) ! 224: continue; ! 225: if (c == EOF) ! 226: return (0); ! 227: cp = tokval; ! 228: if (c == '"') { ! 229: while ((c = getc(cfile)) != EOF && c != '"') { ! 230: if (c == '\\') ! 231: c = getc(cfile); ! 232: *cp++ = c; ! 233: } ! 234: } else { ! 235: *cp++ = c; ! 236: while ((c = getc(cfile)) != EOF ! 237: && c != '\n' && c != '\t' && c != ' ' && c != ',') { ! 238: if (c == '\\') ! 239: c = getc(cfile); ! 240: *cp++ = c; ! 241: } ! 242: } ! 243: *cp = 0; ! 244: if (tokval[0] == 0) ! 245: return (0); ! 246: for (t = toktab; t->tokstr; t++) ! 247: if (!strcmp(t->tokstr, tokval)) ! 248: return (t->tval); ! 249: return (ID); ! 250: } ! 251: /* rest is nbs.c stolen from berknet */ ! 252: ! 253: char *deblknot(), *deblkclr(); ! 254: char *nbs8decrypt(), *nbs8encrypt(); ! 255: static char E[48]; ! 256: ! 257: /* ! 258: * The E bit-selection table. ! 259: */ ! 260: static char e[] = { ! 261: 32, 1, 2, 3, 4, 5, ! 262: 4, 5, 6, 7, 8, 9, ! 263: 8, 9,10,11,12,13, ! 264: 12,13,14,15,16,17, ! 265: 16,17,18,19,20,21, ! 266: 20,21,22,23,24,25, ! 267: 24,25,26,27,28,29, ! 268: 28,29,30,31,32, 1, ! 269: }; ! 270: static ! 271: char *nbsencrypt(str,key,result) ! 272: char *result; ! 273: char *str, *key; { ! 274: static char buf[20],oldbuf[20]; ! 275: register int j; ! 276: result[0] = 0; ! 277: strcpy(oldbuf,key); ! 278: while(*str){ ! 279: for(j=0;j<10;j++)buf[j] = 0; ! 280: for(j=0;j<8 && *str;j++)buf[j] = *str++; ! 281: strcat(result,nbs8encrypt(buf,oldbuf)); ! 282: strcat(result,"$"); ! 283: strcpy(oldbuf,buf); ! 284: } ! 285: return(result); ! 286: } ! 287: static ! 288: char *nbsdecrypt(cpt,key,result) ! 289: char *result; ! 290: char *cpt,*key; { ! 291: char *s; ! 292: char c,oldbuf[20]; ! 293: result[0] = 0; ! 294: strcpy(oldbuf,key); ! 295: while(*cpt){ ! 296: for(s = cpt;*s && *s != '$';s++); ! 297: c = *s; ! 298: *s = 0; ! 299: strcpy(oldbuf,nbs8decrypt(cpt,oldbuf)); ! 300: strcat(result,oldbuf); ! 301: if(c == 0)break; ! 302: cpt = s + 1; ! 303: } ! 304: return(result); ! 305: } ! 306: ! 307: static ! 308: char *nbs8encrypt(str,key) ! 309: char *str, *key; { ! 310: static char keyblk[100], blk[100]; ! 311: register int i; ! 312: ! 313: enblkclr(keyblk,key); ! 314: nbssetkey(keyblk); ! 315: ! 316: for(i=0;i<48;i++) E[i] = e[i]; ! 317: enblkclr(blk,str); ! 318: blkencrypt(blk,0); /* forward dir */ ! 319: ! 320: return(deblknot(blk)); ! 321: } ! 322: ! 323: static ! 324: char *nbs8decrypt(crp,key) ! 325: char *crp, *key; { ! 326: static char keyblk[100], blk[100]; ! 327: register int i; ! 328: ! 329: enblkclr(keyblk,key); ! 330: nbssetkey(keyblk); ! 331: ! 332: for(i=0;i<48;i++) E[i] = e[i]; ! 333: enblknot(blk,crp); ! 334: blkencrypt(blk,1); /* backward dir */ ! 335: ! 336: return(deblkclr(blk)); ! 337: } ! 338: ! 339: static ! 340: enblkclr(blk,str) /* ignores top bit of chars in string str */ ! 341: char *blk,*str; { ! 342: register int i,j; ! 343: char c; ! 344: for(i=0;i<70;i++)blk[i] = 0; ! 345: for(i=0; (c= *str) && i<64; str++){ ! 346: for(j=0; j<7; j++, i++) ! 347: blk[i] = (c>>(6-j)) & 01; ! 348: i++; ! 349: } ! 350: } ! 351: ! 352: static ! 353: char *deblkclr(blk) ! 354: char *blk; { ! 355: register int i,j; ! 356: char c; ! 357: static char iobuf[30]; ! 358: for(i=0; i<10; i++){ ! 359: c = 0; ! 360: for(j=0; j<7; j++){ ! 361: c <<= 1; ! 362: c |= blk[8*i+j]; ! 363: } ! 364: iobuf[i] = c; ! 365: } ! 366: iobuf[i] = 0; ! 367: return(iobuf); ! 368: } ! 369: ! 370: static ! 371: enblknot(blk,crp) ! 372: char *blk; ! 373: char *crp; { ! 374: register int i,j; ! 375: char c; ! 376: for(i=0;i<70;i++)blk[i] = 0; ! 377: for(i=0; (c= *crp) && i<64; crp++){ ! 378: if(c>'Z') c -= 6; ! 379: if(c>'9') c -= 7; ! 380: c -= '.'; ! 381: for(j=0; j<6; j++, i++) ! 382: blk[i] = (c>>(5-j)) & 01; ! 383: } ! 384: } ! 385: ! 386: static ! 387: char *deblknot(blk) ! 388: char *blk; { ! 389: register int i,j; ! 390: char c; ! 391: static char iobuf[30]; ! 392: for(i=0; i<11; i++){ ! 393: c = 0; ! 394: for(j=0; j<6; j++){ ! 395: c <<= 1; ! 396: c |= blk[6*i+j]; ! 397: } ! 398: c += '.'; ! 399: if(c > '9')c += 7; ! 400: if(c > 'Z')c += 6; ! 401: iobuf[i] = c; ! 402: } ! 403: iobuf[i] = 0; ! 404: return(iobuf); ! 405: } ! 406: ! 407: /* ! 408: * This program implements the ! 409: * Proposed Federal Information Processing ! 410: * Data Encryption Standard. ! 411: * See Federal Register, March 17, 1975 (40FR12134) ! 412: */ ! 413: ! 414: /* ! 415: * Initial permutation, ! 416: */ ! 417: static char IP[] = { ! 418: 58,50,42,34,26,18,10, 2, ! 419: 60,52,44,36,28,20,12, 4, ! 420: 62,54,46,38,30,22,14, 6, ! 421: 64,56,48,40,32,24,16, 8, ! 422: 57,49,41,33,25,17, 9, 1, ! 423: 59,51,43,35,27,19,11, 3, ! 424: 61,53,45,37,29,21,13, 5, ! 425: 63,55,47,39,31,23,15, 7, ! 426: }; ! 427: ! 428: /* ! 429: * Final permutation, FP = IP^(-1) ! 430: */ ! 431: static char FP[] = { ! 432: 40, 8,48,16,56,24,64,32, ! 433: 39, 7,47,15,55,23,63,31, ! 434: 38, 6,46,14,54,22,62,30, ! 435: 37, 5,45,13,53,21,61,29, ! 436: 36, 4,44,12,52,20,60,28, ! 437: 35, 3,43,11,51,19,59,27, ! 438: 34, 2,42,10,50,18,58,26, ! 439: 33, 1,41, 9,49,17,57,25, ! 440: }; ! 441: ! 442: /* ! 443: * Permuted-choice 1 from the key bits ! 444: * to yield C and D. ! 445: * Note that bits 8,16... are left out: ! 446: * They are intended for a parity check. ! 447: */ ! 448: static char PC1_C[] = { ! 449: 57,49,41,33,25,17, 9, ! 450: 1,58,50,42,34,26,18, ! 451: 10, 2,59,51,43,35,27, ! 452: 19,11, 3,60,52,44,36, ! 453: }; ! 454: ! 455: static char PC1_D[] = { ! 456: 63,55,47,39,31,23,15, ! 457: 7,62,54,46,38,30,22, ! 458: 14, 6,61,53,45,37,29, ! 459: 21,13, 5,28,20,12, 4, ! 460: }; ! 461: ! 462: /* ! 463: * Sequence of shifts used for the key schedule. ! 464: */ ! 465: static char shifts[] = { ! 466: 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1, ! 467: }; ! 468: ! 469: /* ! 470: * Permuted-choice 2, to pick out the bits from ! 471: * the CD array that generate the key schedule. ! 472: */ ! 473: static char PC2_C[] = { ! 474: 14,17,11,24, 1, 5, ! 475: 3,28,15, 6,21,10, ! 476: 23,19,12, 4,26, 8, ! 477: 16, 7,27,20,13, 2, ! 478: }; ! 479: ! 480: static char PC2_D[] = { ! 481: 41,52,31,37,47,55, ! 482: 30,40,51,45,33,48, ! 483: 44,49,39,56,34,53, ! 484: 46,42,50,36,29,32, ! 485: }; ! 486: ! 487: /* ! 488: * The C and D arrays used to calculate the key schedule. ! 489: */ ! 490: ! 491: static char C[28]; ! 492: static char D[28]; ! 493: /* ! 494: * The key schedule. ! 495: * Generated from the key. ! 496: */ ! 497: static char KS[16][48]; ! 498: ! 499: /* ! 500: * Set up the key schedule from the key. ! 501: */ ! 502: ! 503: static ! 504: nbssetkey(key) ! 505: char *key; ! 506: { ! 507: register i, j, k; ! 508: int t; ! 509: ! 510: /* ! 511: * First, generate C and D by permuting ! 512: * the key. The low order bit of each ! 513: * 8-bit char is not used, so C and D are only 28 ! 514: * bits apiece. ! 515: */ ! 516: for (i=0; i<28; i++) { ! 517: C[i] = key[PC1_C[i]-1]; ! 518: D[i] = key[PC1_D[i]-1]; ! 519: } ! 520: /* ! 521: * To generate Ki, rotate C and D according ! 522: * to schedule and pick up a permutation ! 523: * using PC2. ! 524: */ ! 525: for (i=0; i<16; i++) { ! 526: /* ! 527: * rotate. ! 528: */ ! 529: for (k=0; k<shifts[i]; k++) { ! 530: t = C[0]; ! 531: for (j=0; j<28-1; j++) ! 532: C[j] = C[j+1]; ! 533: C[27] = t; ! 534: t = D[0]; ! 535: for (j=0; j<28-1; j++) ! 536: D[j] = D[j+1]; ! 537: D[27] = t; ! 538: } ! 539: /* ! 540: * get Ki. Note C and D are concatenated. ! 541: */ ! 542: for (j=0; j<24; j++) { ! 543: KS[i][j] = C[PC2_C[j]-1]; ! 544: KS[i][j+24] = D[PC2_D[j]-28-1]; ! 545: } ! 546: } ! 547: } ! 548: ! 549: ! 550: /* ! 551: * The 8 selection functions. ! 552: * For some reason, they give a 0-origin ! 553: * index, unlike everything else. ! 554: */ ! 555: static char S[8][64] = { ! 556: 14, 4,13, 1, 2,15,11, 8, 3,10, 6,12, 5, 9, 0, 7, ! 557: 0,15, 7, 4,14, 2,13, 1,10, 6,12,11, 9, 5, 3, 8, ! 558: 4, 1,14, 8,13, 6, 2,11,15,12, 9, 7, 3,10, 5, 0, ! 559: 15,12, 8, 2, 4, 9, 1, 7, 5,11, 3,14,10, 0, 6,13, ! 560: ! 561: 15, 1, 8,14, 6,11, 3, 4, 9, 7, 2,13,12, 0, 5,10, ! 562: 3,13, 4, 7,15, 2, 8,14,12, 0, 1,10, 6, 9,11, 5, ! 563: 0,14, 7,11,10, 4,13, 1, 5, 8,12, 6, 9, 3, 2,15, ! 564: 13, 8,10, 1, 3,15, 4, 2,11, 6, 7,12, 0, 5,14, 9, ! 565: ! 566: 10, 0, 9,14, 6, 3,15, 5, 1,13,12, 7,11, 4, 2, 8, ! 567: 13, 7, 0, 9, 3, 4, 6,10, 2, 8, 5,14,12,11,15, 1, ! 568: 13, 6, 4, 9, 8,15, 3, 0,11, 1, 2,12, 5,10,14, 7, ! 569: 1,10,13, 0, 6, 9, 8, 7, 4,15,14, 3,11, 5, 2,12, ! 570: ! 571: 7,13,14, 3, 0, 6, 9,10, 1, 2, 8, 5,11,12, 4,15, ! 572: 13, 8,11, 5, 6,15, 0, 3, 4, 7, 2,12, 1,10,14, 9, ! 573: 10, 6, 9, 0,12,11, 7,13,15, 1, 3,14, 5, 2, 8, 4, ! 574: 3,15, 0, 6,10, 1,13, 8, 9, 4, 5,11,12, 7, 2,14, ! 575: ! 576: 2,12, 4, 1, 7,10,11, 6, 8, 5, 3,15,13, 0,14, 9, ! 577: 14,11, 2,12, 4, 7,13, 1, 5, 0,15,10, 3, 9, 8, 6, ! 578: 4, 2, 1,11,10,13, 7, 8,15, 9,12, 5, 6, 3, 0,14, ! 579: 11, 8,12, 7, 1,14, 2,13, 6,15, 0, 9,10, 4, 5, 3, ! 580: ! 581: 12, 1,10,15, 9, 2, 6, 8, 0,13, 3, 4,14, 7, 5,11, ! 582: 10,15, 4, 2, 7,12, 9, 5, 6, 1,13,14, 0,11, 3, 8, ! 583: 9,14,15, 5, 2, 8,12, 3, 7, 0, 4,10, 1,13,11, 6, ! 584: 4, 3, 2,12, 9, 5,15,10,11,14, 1, 7, 6, 0, 8,13, ! 585: ! 586: 4,11, 2,14,15, 0, 8,13, 3,12, 9, 7, 5,10, 6, 1, ! 587: 13, 0,11, 7, 4, 9, 1,10,14, 3, 5,12, 2,15, 8, 6, ! 588: 1, 4,11,13,12, 3, 7,14,10,15, 6, 8, 0, 5, 9, 2, ! 589: 6,11,13, 8, 1, 4,10, 7, 9, 5, 0,15,14, 2, 3,12, ! 590: ! 591: 13, 2, 8, 4, 6,15,11, 1,10, 9, 3,14, 5, 0,12, 7, ! 592: 1,15,13, 8,10, 3, 7, 4,12, 5, 6,11, 0,14, 9, 2, ! 593: 7,11, 4, 1, 9,12,14, 2, 0, 6,10,13,15, 3, 5, 8, ! 594: 2, 1,14, 7, 4,10, 8,13,15,12, 9, 0, 3, 5, 6,11, ! 595: }; ! 596: ! 597: /* ! 598: * P is a permutation on the selected combination ! 599: * of the current L and key. ! 600: */ ! 601: static char P[] = { ! 602: 16, 7,20,21, ! 603: 29,12,28,17, ! 604: 1,15,23,26, ! 605: 5,18,31,10, ! 606: 2, 8,24,14, ! 607: 32,27, 3, 9, ! 608: 19,13,30, 6, ! 609: 22,11, 4,25, ! 610: }; ! 611: ! 612: /* ! 613: * The current block, divided into 2 halves. ! 614: */ ! 615: static char L[32], R[32]; ! 616: static char tempL[32]; ! 617: static char f[32]; ! 618: ! 619: /* ! 620: * The combination of the key and the input, before selection. ! 621: */ ! 622: static char preS[48]; ! 623: ! 624: /* ! 625: * The payoff: encrypt a block. ! 626: */ ! 627: ! 628: static ! 629: blkencrypt(block, edflag) ! 630: char *block; ! 631: { ! 632: int i, ii; ! 633: register t, j, k; ! 634: ! 635: /* ! 636: * First, permute the bits in the input ! 637: */ ! 638: for (j=0; j<64; j++) ! 639: L[j] = block[IP[j]-1]; ! 640: /* ! 641: * Perform an encryption operation 16 times. ! 642: */ ! 643: for (ii=0; ii<16; ii++) { ! 644: /* ! 645: * Set direction ! 646: */ ! 647: if (edflag) ! 648: i = 15-ii; ! 649: else ! 650: i = ii; ! 651: /* ! 652: * Save the R array, ! 653: * which will be the new L. ! 654: */ ! 655: for (j=0; j<32; j++) ! 656: tempL[j] = R[j]; ! 657: /* ! 658: * Expand R to 48 bits using the E selector; ! 659: * exclusive-or with the current key bits. ! 660: */ ! 661: for (j=0; j<48; j++) ! 662: preS[j] = R[E[j]-1] ^ KS[i][j]; ! 663: /* ! 664: * The pre-select bits are now considered ! 665: * in 8 groups of 6 bits each. ! 666: * The 8 selection functions map these ! 667: * 6-bit quantities into 4-bit quantities ! 668: * and the results permuted ! 669: * to make an f(R, K). ! 670: * The indexing into the selection functions ! 671: * is peculiar; it could be simplified by ! 672: * rewriting the tables. ! 673: */ ! 674: for (j=0; j<8; j++) { ! 675: t = 6*j; ! 676: k = S[j][(preS[t+0]<<5)+ ! 677: (preS[t+1]<<3)+ ! 678: (preS[t+2]<<2)+ ! 679: (preS[t+3]<<1)+ ! 680: (preS[t+4]<<0)+ ! 681: (preS[t+5]<<4)]; ! 682: t = 4*j; ! 683: f[t+0] = (k>>3)&01; ! 684: f[t+1] = (k>>2)&01; ! 685: f[t+2] = (k>>1)&01; ! 686: f[t+3] = (k>>0)&01; ! 687: } ! 688: /* ! 689: * The new R is L ^ f(R, K). ! 690: * The f here has to be permuted first, though. ! 691: */ ! 692: for (j=0; j<32; j++) ! 693: R[j] = L[j] ^ f[P[j]-1]; ! 694: /* ! 695: * Finally, the new L (the original R) ! 696: * is copied back. ! 697: */ ! 698: for (j=0; j<32; j++) ! 699: L[j] = tempL[j]; ! 700: } ! 701: /* ! 702: * The output L and R are reversed. ! 703: */ ! 704: for (j=0; j<32; j++) { ! 705: t = L[j]; ! 706: L[j] = R[j]; ! 707: R[j] = t; ! 708: } ! 709: /* ! 710: * The final output ! 711: * gets the inverse permutation of the very original. ! 712: */ ! 713: for (j=0; j<64; j++) ! 714: block[j] = L[FP[j]-1]; ! 715: } ! 716: /* ! 717: getutmp() ! 718: return a pointer to the system utmp structure associated with ! 719: terminal sttyname, e.g. "/dev/tty3" ! 720: Is version independent-- will work on v6 systems ! 721: return NULL if error ! 722: */ ! 723: static ! 724: struct utmp *getutmp(sttyname) ! 725: char *sttyname; ! 726: { ! 727: static struct utmp utmpstr; ! 728: FILE *fdutmp; ! 729: ! 730: if(sttyname == NULL || sttyname[0] == 0)return(NULL); ! 731: ! 732: fdutmp = fopen("/etc/utmp","r"); ! 733: if(fdutmp == NULL)return(NULL); ! 734: ! 735: while(fread(&utmpstr,1,sizeof utmpstr,fdutmp) == sizeof utmpstr) ! 736: if(strcmp(utmpstr.ut_line,sttyname+5) == 0){ ! 737: fclose(fdutmp); ! 738: return(&utmpstr); ! 739: } ! 740: fclose(fdutmp); ! 741: return(NULL); ! 742: } ! 743: ! 744: static ! 745: sreverse(sto, sfrom) ! 746: register char *sto, *sfrom; ! 747: { ! 748: register int i; ! 749: ! 750: i = strlen(sfrom); ! 751: while (i >= 0) ! 752: *sto++ = sfrom[i--]; ! 753: } ! 754: ! 755: static ! 756: char *mkenvkey(mch) ! 757: char mch; ! 758: { ! 759: static char skey[40]; ! 760: register struct utmp *putmp; ! 761: char stemp[40], stemp1[40], sttyname[30]; ! 762: register char *sk,*p; ! 763: ! 764: if (isatty(2)) ! 765: strcpy(sttyname,ttyname(2)); ! 766: else if (isatty(0)) ! 767: strcpy(sttyname,ttyname(0)); ! 768: else if (isatty(1)) ! 769: strcpy(sttyname,ttyname(1)); ! 770: else ! 771: return (NULL); ! 772: putmp = getutmp(sttyname); ! 773: if (putmp == NULL) ! 774: return (NULL); ! 775: sk = skey; ! 776: p = putmp->ut_line; ! 777: while (*p) ! 778: *sk++ = *p++; ! 779: *sk++ = mch; ! 780: (void)sprintf(stemp, "%ld", putmp->ut_time); ! 781: sreverse(stemp1, stemp); ! 782: p = stemp1; ! 783: while (*p) ! 784: *sk++ = *p++; ! 785: *sk = 0; ! 786: return (skey); ! 787: } ! 788: ! 789: mkpwunclear(spasswd,mch,sencpasswd) ! 790: char mch, *spasswd, *sencpasswd; ! 791: { ! 792: register char *skey; ! 793: ! 794: if (spasswd[0] == 0) { ! 795: sencpasswd[0] = 0; ! 796: return; ! 797: } ! 798: skey = mkenvkey(mch); ! 799: if (skey == NULL) { ! 800: fprintf(stderr, "Can't make key\n"); ! 801: exit(1); ! 802: } ! 803: nbsencrypt(spasswd, skey, sencpasswd); ! 804: } ! 805: ! 806: mkpwclear(sencpasswd,mch,spasswd) ! 807: char mch, *spasswd, *sencpasswd; ! 808: { ! 809: register char *skey; ! 810: ! 811: if (sencpasswd[0] == 0) { ! 812: spasswd[0] = 0; ! 813: return; ! 814: } ! 815: skey = mkenvkey(mch); ! 816: if (skey == NULL) { ! 817: fprintf(stderr, "Can't make key\n"); ! 818: exit(1); ! 819: } ! 820: nbsdecrypt(sencpasswd, skey, spasswd); ! 821: }
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