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- /**********************************************************************
- *
- * LCrypt.c 03/06/88
- *
- * Original cipher code lifted, almost verbatim, from LUCIFER.C
- * by R.W. Outerbridge. I'm not sure that this code is copyrighted,
- * no mention of it's status was present in the orginal source file.
- *
- * The original MS-DOS source was aquired from the Cryptography BBS,
- * (703) 237-4322 McLean VA.
- *
- * Command line interface code by Jack Radigan. This code is
- * is free of any restrictions, You are free to include and/or
- * modifiy for your use in any program, commercial or otherwise.
- *
- * A one line blurb of credit in your source would be nice though...
- *
- * Compiled with Aztec C vers. 3.40a
- *
- ***********************************************************************/
-
-
- #include <stdio.h>
-
- #define toascii(a) ((a)&0177)
- #define EN 0
- #define DE 1
-
- typedef char BYTE;
-
- int IOedf, End, Once, crypt_flag;
-
- char output[132], dir[35], temp[132], *rindex();
-
- BYTE Block[16], Link[16], Temp[16], IV[16], Last[16];
-
- BYTE DFLTKY[16] = { 1,35,69,103,137,171,205,239,254,220,186,152,118,84,50,16 };
-
- FILE *fp_in, *fp_out;
-
- main(argc, argv)
- int argc;
- char **argv;
- {
- int c, i, j, k, count;
- char *filename, *s, *fn[500];
- char *scdir(), *malloc();
- BYTE kv[16];
-
- printf("LCrypt 1.0 1988 by Jack Radigan\n");
-
- if(*argv[1] == '?')
- help();
-
- if(argc < 3)
- useage_error();
-
- crypt_flag = EN;
- if(strlen(argv[1]) == 1) {
- if(*argv[1] != 'e' && *argv[1] != 'E' && *argv[1] != 'd' &&
- *argv[1] != 'D')
- useage_error();
-
- if(*argv[1] == 'd' || *argv[1] == 'D')
- crypt_flag = DE;
- argv++;
- argc--;
- }
- if(*argv[1] == '-') {
- strcpy(dir, argv[1] + 1);
- if(dir[strlen(dir) - 1] != ':' && dir[strlen(dir) - 1] != '/') {
- printf("Illegal directory specification!\n");
- exit(0);
- }
- argv++;
- argc--;
- }
- getkey(argv[1], kv);
-
- j = 0;
- printf("Creating file list,");
- fflush(stdout);
- for(i = 2; i < argc; i++) {
- strcpy(temp, argv[i]);
- if(crypt_flag)
- if(strcmp(temp + strlen(temp) - 3, ".lu"))
- strcat(temp, ".lu");
-
- while((filename = scdir(temp)) && j < 500) {
- fn[j] = malloc(strlen(filename) + 1);
- strcpy(fn[j++], filename);
- }
- }
- printf(" %d files found.\n", j);
- for(i = 0; i < j; i++) {
- strcpy(output, fn[i]);
-
- if((fp_in = fopen(output, "r")) == NULL) {
- printf("Unable to open input file.\n");
- continue;
- }
- if((fp_out = fopen("ram:LCrypt.tmp", "w")) == NULL) {
- fclose(fp_in);
- printf("Unable to open temporary file in ram:, exiting.\n");
- exit(0);
- }
- printf("%s ", output);
- fflush(stdout);
- loadkey(kv, crypt_flag);
- initio(crypt_flag);
-
- while(get16(Block) != EOF) {
- lucifer(Block);
- put16(Block);
- }
- fclose(fp_in);
- fclose(fp_out);
-
- strcpy(temp, dir);
- if(s = rindex(output, '/'))
- s++;
- else if(s = rindex(output, ':'))
- s++;
- else
- s = output;
- strcat(temp, s);
-
- if((fp_in = fopen("ram:LCrypt.tmp", "r")) == NULL)
- continue;
- if((fp_out = fopen(temp, "w")) == NULL) {
- fclose(fp_in);
- exit(0);
- }
- count = 0;
- while((c = fgetc(fp_in)) != EOF) {
- fputc(c, fp_out);
- count++;
- }
- fclose(fp_in);
- fclose(fp_out);
-
- if((fp_in = fopen("ram:LCrypt.tmp", "w")) == NULL)
- continue;
- for(k = 0; k <= count; k++)
- fputc('\0', fp_in);
- fclose(fp_in);
-
- strcpy(output, temp);
- if(crypt_flag) {
- output[strlen(output) - 3] = '\0';
- Rename(temp, output);
- printf("decrypted.\n");
- }
- else {
- strcat(output, ".lu");
- Rename(temp, output);
- printf("encrypted.\n");
- }
- }
- DeleteFile("ram:LCrypt.tmp");
- printf("LCrypt finished.\n");
- }
-
- useage_error()
- {
- printf("Usage: LCrypt [de] [-directory] key filename [filename...]\n");
- printf(" LCrypt ? for help.\n\n");
- exit(0);
- }
-
- help()
- {
- printf("Usage: LCrypt [de] [-directory] key filename [filename...]\n\n");
- printf(" d - decrypt file.\n");
- printf(" e - encrypt file. [default mode]\n");
- printf(" -directory - optional directory for output, include\n");
- printf(" trailing ':' or '/' for a sub-directory.\n");
- printf(" key - delimit with quotes if spaces are used.\n");
- printf(" filename - wildcards '?' and '*' can be used. AmigaDOS\n");
- printf(" style wildcards are not supported.\n");
- exit(0);
- }
-
- copy16(from, to)
- register BYTE *from, *to;
- {
- register int i;
- for(i = 0; i < 16; i++)
- to[i] = from[i];
- return;
- }
-
- xor16(to, with)
- register BYTE *to, *with;
- {
- register int i;
- for(i = 0; i < 16; i++)
- to[i] ^= with[i];
- return;
- }
-
- put16(block)
- register BYTE *block;
- {
- if(IOedf == DE)
- copy16(block, Last);
- else
- vraiput(block, &block[16]);
- return;
- }
-
- get16(input)
- register BYTE *input;
- {
- register int i, j;
- if(End == 1)
- return(EOF); /* no more input */
-
- for(i=0; i < 16 && ((j = fgetc(fp_in)) != EOF); i++)
- *input++ = j;
-
- if(IOedf == DE) { /* DECRYPTION */
-
- /* complete block? pending output? */
- if(i == 16 && (Once > 0))
- vraiput(Last, &Last[16]);
- else if(j == EOF) {
- End = 1;
- if(Once > 0) {
-
- /* incomplete block means no nulls */
- if(i != 0)
- i = 0;
- else {
- i = Last[15]&0377;
- if(i > 16)
- i = 0; /* huh? */
- }
- vraiput(Last, &Last[16-i]);
- }
- return(EOF);
- }
- }
- else if(j == EOF) { /* ENCRYPTION */
- End = 1;
- if(i == 0 && (IOedf == EN || (Once > 0))) {
-
- /* if no padding to do, print a kludge */
- if(IOedf == EN && (Once > 0))
- fputc('0', fp_out);
- return(EOF);
- }
- for(j=i; j < 15; j++)
- *input++ = NULL;
- *input = 16-i;
- }
- Once = 1;
- return(0);
- }
-
- getkey(aptr, kptr)
- register BYTE *aptr;
- register BYTE *kptr;
- {
- register BYTE *store;
- register int i, first;
- BYTE hold[16];
- first = 1;
- loadkey(DFLTKY, EN);
- copy16(DFLTKY, hold);
- while(*aptr || first) {
- store = kptr;
- for(i=0; i<16 && (*aptr != NULL); i++) {
- *store++ = toascii(*aptr);
- *aptr++ = NULL;
- }
- while(i++ < 16)
- *store++ = NULL;
- xor16(kptr, hold);
- lucifer(kptr);
- copy16(kptr, hold);
- first = 0;
- }
- return;
- }
-
- vraiput(cp, ep)
- register BYTE *cp, *ep;
- {
- while(cp < ep)
- fputc((BYTE)*cp++, fp_out);
- return;
- }
-
- initio(edf)
- int edf;
- {
- IOedf = edf;
- End = Once = 0;
- return;
- }
-
- /* LUCIFER is a cryptographic algorithm developed by IBM in the early
- * seventies. It was a predecessor of the DES, and is much simpler
- * than that algorithm. In particular, it has only two substitution
- * boxes. It does, however, use a 128 bit key and operates on
- * sixteen byte data blocks...
- *
- * This implementation of LUCIFER was crafted by Graven Cyphers at the
- * University of Toronto, Canada, with programming assistance from
- * Richard Outerbridge. It is based on the FORTRAN routines which
- * concluded Arthur Sorkin's article "LUCIFER: A Cryptographic Algorithm",
- * CRYPTOLOGIA, Volume 8, Number 1, January 1984, pp22-42. The interested
- * reader should refer to that article rather than this program for more
- * details on LUCIFER.
- *
- * These routines bear little resemblance to the actual LUCIFER algorithm,
- * which has been severely twisted in the interests of speed. They do
- * perform the same transformations, and are believed to be UNIX portable.
- * The package was developed for use on UNIX-like systems lacking crypto
- * facilities. They are not very fast, but the cipher is very strong.
- * The routines in this file are suitable for use as a subroutine library
- * after the fashion of crypt(3). When linked together with applications
- * routines they can also provide a high-level cryptographic system.
- *
- * -DENHANCE : modify LUCIFER by changing the key schedule and performing
- * an "autokeyed" encryption. These may improve the algorithm.
- */
-
- static BYTE Dps[64] = { /* Diffusion Pattern schedule */
- 4,16,32,2,1,8,64,128, 128,4,16,32,2,1,8,64,
- 64,128,4,16,32,2,1,8, 8,64,128,4,16,32,2,1,
- 1,8,64,128,4,16,32,2, 2,1,8,64,128,4,16,32,
- 32,2,1,8,64,128,4,16, 16,32,2,1,8,64,128,4 };
-
- /* Precomputed S&P Boxes, Two Varieties */
-
- static BYTE TCB0[256] = {
- 87, 21,117, 54, 23, 55, 20, 84,116,118, 22, 53, 85,119, 52, 86,
- 223,157,253,190,159,191,156,220,252,254,158,189,221,255,188,222,
- 207,141,237,174,143,175,140,204,236,238,142,173,205,239,172,206,
- 211,145,241,178,147,179,144,208,240,242,146,177,209,243,176,210,
- 215,149,245,182,151,183,148,212,244,246,150,181,213,247,180,214,
- 95, 29,125, 62, 31, 63, 28, 92,124,126, 30, 61, 93,127, 60, 94,
- 219,153,249,186,155,187,152,216,248,250,154,185,217,251,184,218,
- 67, 1, 97, 34, 3, 35, 0, 64, 96, 98, 2, 33, 65, 99, 32, 66,
- 195,129,225,162,131,163,128,192,224,226,130,161,193,227,160,194,
- 199,133,229,166,135,167,132,196,228,230,134,165,197,231,164,198,
- 203,137,233,170,139,171,136,200,232,234,138,169,201,235,168,202,
- 75, 9,105, 42, 11, 43, 8, 72,104,106, 10, 41, 73,107, 40, 74,
- 91, 25,121, 58, 27, 59, 24, 88,120,122, 26, 57, 89,123, 56, 90,
- 71, 5,101, 38, 7, 39, 4, 68,100,102, 6, 37, 69,103, 36, 70,
- 79, 13,109, 46, 15, 47, 12, 76,108,110, 14, 45, 77,111, 44, 78,
- 83, 17,113, 50, 19, 51, 16, 80,112,114, 18, 49, 81,115, 48, 82 };
-
- static BYTE TCB1[256] = {
- 87,223,207,211,215, 95,219, 67,195,199,203, 75, 91, 71, 79, 83,
- 21,157,141,145,149, 29,153, 1,129,133,137, 9, 25, 5, 13, 17,
- 117,253,237,241,245,125,249, 97,225,229,233,105,121,101,109,113,
- 54,190,174,178,182, 62,186, 34,162,166,170, 42, 58, 38, 46, 50,
- 23,159,143,147,151, 31,155, 3,131,135,139, 11, 27, 7, 15, 19,
- 55,191,175,179,183, 63,187, 35,163,167,171, 43, 59, 39, 47, 51,
- 20,156,140,144,148, 28,152, 0,128,132,136, 8, 24, 4, 12, 16,
- 84,220,204,208,212, 92,216, 64,192,196,200, 72, 88, 68, 76, 80,
- 116,252,236,240,244,124,248, 96,224,228,232,104,120,100,108,112,
- 118,254,238,242,246,126,250, 98,226,230,234,106,122,102,110,114,
- 22,158,142,146,150, 30,154, 2,130,134,138, 10, 26, 6, 14, 18,
- 53,189,173,177,181, 61,185, 33,161,165,169, 41, 57, 37, 45, 49,
- 85,221,205,209,213, 93,217, 65,193,197,201, 73, 89, 69, 77, 81,
- 119,255,239,243,247,127,251, 99,227,231,235,107,123,103,111,115,
- 52,188,172,176,180, 60,184, 32,160,164,168, 40, 56, 36, 44, 48,
- 86,222,206,210,214, 94,218, 66,194,198,202, 74, 90, 70, 78, 82 };
-
- static BYTE Key[16], Pkey[128];
- static int P[8] = { 3,5,0,4,2,1,7,6 };
- static int Smask[16] = { 128,64,32,16,8,4,2,1 };
-
- lucifer(bytes)
- BYTE *bytes; /* points to a 16-byte array */
- {
- register BYTE *cp, *sp, *dp;
- register int val, *sbs, tcb, j, i;
- BYTE *h0, *h1, *kc, *ks;
-
- h0 = bytes; /* the "lower" half */
- h1 = bytes + 8; /* the "upper" half */
- kc = Pkey;
- ks = Key;
-
- for(i=0; i<16; i++) {
- tcb = *ks++;
- sbs = Smask;
- dp = Dps;
- sp = &h0[8];
- for(j=0; j<8; j++) {
- if(tcb&*sbs++) val = TCB1[h1[j]&0377];
- else val = TCB0[h1[j]&0377];
- val ^= *kc++;
- for(cp=h0; cp<sp;) *cp++ ^= (val&*dp++);
- }
-
- /* swap (virtual) halves */
- cp = h0;
- h0 = h1;
- h1 = cp;
- }
-
- /* REALLY swap halves */
- dp = bytes;
- cp = bytes + 8;
- for(sp=cp; dp<sp; dp++, cp++) {
- val = *dp;
- *dp = *cp;
- *cp = val;
- }
- return;
- }
-
- loadkey(keystr, edf) /* precomputes the key schedules */
- BYTE *keystr;
- register int edf;
- {
- register BYTE *ep, *cp, *pp;
- register int kc, i, j;
- BYTE kk[16], pk[16];
- cp = kk;
- pp = pk;
- ep = &kk[16];
- while(cp < ep) {
- *cp++ = *keystr;
- for(*pp=i=0; i<8; i++)
- if(*keystr&Smask[i]) *pp |= Smask[P[i]];
- keystr++;
- pp++;
- }
- cp = Key;
- pp = Pkey;
- kc = (edf == DE) ? 8 : 0;
- for(i=0; i<16; i++) {
- if(edf == DE) kc = (++kc)&017;
- *cp++ = kk[kc];
- for(j=0; j<8; j++) {
- *pp++ = pk[kc];
- if(j<7 || (edf == DE)) kc = (++kc)&017;
- }
- }
- return;
- }
-